System.Data.SQLite
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Overview
Comment:When marshalling from/to the SQLiteIndex class, only marshal data members of the needed direction. The SQLiteVirtualTableCursorEnumerable class should implement the IDisposable pattern. More work on docs.
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | virtualTables
Files: files | file ages | folders
SHA1: c6a8523c45e9e39ecf08492d4d9912551760ee86
User & Date: mistachkin 2013-06-25 09:53:48
Context
2013-06-25
11:55
First attempt at making virtual table support work on the .NET Compact Framework. check-in: 78e8297a83 user: mistachkin tags: virtualTables
09:53
When marshalling from/to the SQLiteIndex class, only marshal data members of the needed direction. The SQLiteVirtualTableCursorEnumerable class should implement the IDisposable pattern. More work on docs. check-in: c6a8523c45 user: mistachkin tags: virtualTables
08:24
Move byte array handling methods to the SQLiteBytes class. Remove superfluous ValueArrayFromSizeAndIntPtr method from the SQLiteMarshal class. More work on docs. check-in: 75dd5c847a user: mistachkin tags: virtualTables
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to System.Data.SQLite/SQLiteModule.cs.

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    ///////////////////////////////////////////////////////////////////////////

    #region SQLiteVirtualTable Base Class
    /// <summary>
    /// This class represents a managed virtual table implementation.  It is
    /// not sealed and should be used as the base class for any user-defined
    /// virtual tables implemented in managed code.
    /// </summary>
    public class SQLiteVirtualTable :
            ISQLiteNativeHandle, IDisposable /* NOT SEALED */
    {
        #region Private Constants
        /// <summary>
        /// The index within the array of strings provided to the
................................................................................

    ///////////////////////////////////////////////////////////////////////////

    #region SQLiteVirtualTableCursor Base Class
    /// <summary>
    /// This class represents a managed virtual table cursor implementation.
    /// It is not sealed and should be used as the base class for any
    /// user-defined virtual table cursor implemented in managed code.
    /// </summary>
    public class SQLiteVirtualTableCursor :
            ISQLiteNativeHandle, IDisposable /* NOT SEALED */
    {
        #region Public Constructors
        /// <summary>
        /// Constructs an instance of this class.
................................................................................
#endif
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region SQLiteValue Helper Methods












        public static SQLiteValue[] ValueArrayFromIntPtrArray(
            IntPtr[] values
            )
        {
            if (values == null)
                return null;

................................................................................
            return result;
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region SQLiteIndex Helper Methods












        public static void IndexFromIntPtr(
            IntPtr pIndex,
            ref SQLiteIndex index
            )
        {
            if (pIndex == IntPtr.Zero)
                return;
................................................................................

            IntPtr pConstraint = ReadIntPtr(pIndex, offset);

            offset += IntPtr.Size;

            int nOrderBy = ReadInt32(pIndex, offset);

            index = new SQLiteIndex(nConstraint, nOrderBy);

            offset += sizeof(int);

            IntPtr pOrderBy = ReadIntPtr(pIndex, offset);

            offset += IntPtr.Size;

            IntPtr pConstraintUsage = ReadIntPtr(pIndex, offset);

            offset += IntPtr.Size;

            index.Outputs.IndexNumber = ReadInt32(pIndex, offset);

            offset += sizeof(int);

            index.Outputs.IndexString = SQLiteString.StringFromUtf8IntPtr(
                IntPtrForOffset(pIndex, offset));

            offset += IntPtr.Size;

            index.Outputs.NeedToFreeIndexString = ReadInt32(pIndex, offset);

            offset += sizeof(int);

            index.Outputs.OrderByConsumed = ReadInt32(pIndex, offset);

            offset += sizeof(int);

            index.Outputs.EstimatedCost = ReadDouble(pIndex, offset);

            int sizeOfConstraintType = Marshal.SizeOf(typeof(
                UnsafeNativeMethods.sqlite3_index_constraint));

            for (int iConstraint = 0; iConstraint < nConstraint; iConstraint++)
            {
                UnsafeNativeMethods.sqlite3_index_constraint constraint =
................................................................................

                Marshal.PtrToStructure(IntPtrForOffset(pOrderBy,
                    iOrderBy * sizeOfOrderByType), orderBy);

                index.Inputs.OrderBys[iOrderBy] =
                    new SQLiteIndexOrderBy(orderBy);
            }

            int sizeOfConstraintUsageType = Marshal.SizeOf(typeof(
                UnsafeNativeMethods.sqlite3_index_constraint_usage));

            for (int iConstraint = 0; iConstraint < nConstraint; iConstraint++)
            {
                UnsafeNativeMethods.sqlite3_index_constraint_usage constraintUsage =
                    new UnsafeNativeMethods.sqlite3_index_constraint_usage();

                Marshal.PtrToStructure(IntPtrForOffset(pConstraintUsage,
                    iConstraint * sizeOfConstraintUsageType), constraintUsage);

                index.Outputs.ConstraintUsages[iConstraint] =
                    new SQLiteIndexConstraintUsage(constraintUsage);
            }
        }

        ///////////////////////////////////////////////////////////////////////














        public static void IndexToIntPtr(
            SQLiteIndex index,
            IntPtr pIndex
            )
        {
            if ((index == null) || (index.Inputs == null) ||
                (index.Inputs.Constraints == null) ||
                (index.Inputs.OrderBys == null) || (index.Outputs == null) ||
                (index.Outputs.ConstraintUsages == null))
            {
                return;
            }

            if (pIndex == IntPtr.Zero)
                return;
................................................................................

            if (nConstraint != index.Inputs.Constraints.Length)
                return;

            if (nConstraint != index.Outputs.ConstraintUsages.Length)
                return;

            offset += sizeof(int);

            IntPtr pConstraint = ReadIntPtr(pIndex, offset);

            offset += IntPtr.Size;

            int nOrderBy = ReadInt32(pIndex, offset);

            offset += sizeof(int);

            IntPtr pOrderBy = ReadIntPtr(pIndex, offset);

            offset += IntPtr.Size;

            IntPtr pConstraintUsage = ReadIntPtr(pIndex, offset);

            int sizeOfConstraintType = Marshal.SizeOf(typeof(
                UnsafeNativeMethods.sqlite3_index_constraint));

            for (int iConstraint = 0; iConstraint < nConstraint; iConstraint++)
            {
                UnsafeNativeMethods.sqlite3_index_constraint constraint =
                    new UnsafeNativeMethods.sqlite3_index_constraint(
                        index.Inputs.Constraints[iConstraint]);

                Marshal.StructureToPtr(
                    constraint, IntPtrForOffset(pConstraint,
                    iConstraint * sizeOfConstraintType), false);

                index.Inputs.Constraints[iConstraint] =
                    new SQLiteIndexConstraint(constraint);
            }

            int sizeOfOrderByType = Marshal.SizeOf(typeof(
                UnsafeNativeMethods.sqlite3_index_orderby));

            for (int iOrderBy = 0; iOrderBy < nOrderBy; iOrderBy++)
            {
                UnsafeNativeMethods.sqlite3_index_orderby orderBy =
                    new UnsafeNativeMethods.sqlite3_index_orderby(
                        index.Inputs.OrderBys[iOrderBy]);

                Marshal.StructureToPtr(
                    orderBy, IntPtrForOffset(pOrderBy,
                    iOrderBy * sizeOfOrderByType), false);

                index.Inputs.OrderBys[iOrderBy] =
                    new SQLiteIndexOrderBy(orderBy);
            }

            int sizeOfConstraintUsageType = Marshal.SizeOf(typeof(
                UnsafeNativeMethods.sqlite3_index_constraint_usage));

            for (int iConstraint = 0; iConstraint < nConstraint; iConstraint++)
            {
                UnsafeNativeMethods.sqlite3_index_constraint_usage constraintUsage =
                    new UnsafeNativeMethods.sqlite3_index_constraint_usage(
................................................................................
                Marshal.StructureToPtr(
                    constraintUsage, IntPtrForOffset(pConstraintUsage,
                    iConstraint * sizeOfConstraintUsageType), false);

                index.Outputs.ConstraintUsages[iConstraint] =
                    new SQLiteIndexConstraintUsage(constraintUsage);
            }





















        }
        #endregion
    }
    #endregion

    ///////////////////////////////////////////////////////////////////////////

    #region SQLiteModule Base Class





    public abstract class SQLiteModule :
            ISQLiteManagedModule, /*ISQLiteNativeModule,*/
            IDisposable /* NOT SEALED */
    {
        #region SQLiteNativeModule Private Class
        private sealed class SQLiteNativeModule :
                ISQLiteNativeModule, IDisposable
................................................................................
        ///////////////////////////////////////////////////////////////////////

        #region Public Constructors
        /// <summary>
        /// Constructs an instance of this class.
        /// </summary>
        /// <param name="name">
        /// The name of the module.
        /// </param>
        public SQLiteModule(string name)
        {
            if (name == null)
                throw new ArgumentNullException("name");

            this.name = name;







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    ///////////////////////////////////////////////////////////////////////////

    #region SQLiteVirtualTable Base Class
    /// <summary>
    /// This class represents a managed virtual table implementation.  It is
    /// not sealed and should be used as the base class for any user-defined
    /// virtual table classes implemented in managed code.
    /// </summary>
    public class SQLiteVirtualTable :
            ISQLiteNativeHandle, IDisposable /* NOT SEALED */
    {
        #region Private Constants
        /// <summary>
        /// The index within the array of strings provided to the
................................................................................

    ///////////////////////////////////////////////////////////////////////////

    #region SQLiteVirtualTableCursor Base Class
    /// <summary>
    /// This class represents a managed virtual table cursor implementation.
    /// It is not sealed and should be used as the base class for any
    /// user-defined virtual table cursor classes implemented in managed code.
    /// </summary>
    public class SQLiteVirtualTableCursor :
            ISQLiteNativeHandle, IDisposable /* NOT SEALED */
    {
        #region Public Constructors
        /// <summary>
        /// Constructs an instance of this class.
................................................................................
#endif
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region SQLiteValue Helper Methods
        /// <summary>
        /// Converts an array of native pointers to native sqlite3_value
        /// structures into a managed array of <see cref="SQLiteValue" />
        /// object instances.
        /// </summary>
        /// <param name="values">
        /// The array of native pointers to convert.
        /// </param>
        /// <returns>
        /// The managed array of <see cref="SQLiteValue" /> object instances or
        /// null upon failure.
        /// </returns>
        public static SQLiteValue[] ValueArrayFromIntPtrArray(
            IntPtr[] values
            )
        {
            if (values == null)
                return null;

................................................................................
            return result;
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region SQLiteIndex Helper Methods
        /// <summary>
        /// Converts a native pointer to a native sqlite3_index_info structure
        /// into a new <see cref="SQLiteIndex" /> object instance.
        /// </summary>
        /// <param name="pIndex">
        /// The native pointer to the native sqlite3_index_info structure to
        /// convert.
        /// </param>
        /// <param name="index">
        /// Upon success, this parameter will be modified to contain the newly
        /// created <see cref="SQLiteIndex" /> object instance.
        /// </param>
        public static void IndexFromIntPtr(
            IntPtr pIndex,
            ref SQLiteIndex index
            )
        {
            if (pIndex == IntPtr.Zero)
                return;
................................................................................

            IntPtr pConstraint = ReadIntPtr(pIndex, offset);

            offset += IntPtr.Size;

            int nOrderBy = ReadInt32(pIndex, offset);



            offset += sizeof(int);

            IntPtr pOrderBy = ReadIntPtr(pIndex, offset);

            index = new SQLiteIndex(nConstraint, nOrderBy);
























            int sizeOfConstraintType = Marshal.SizeOf(typeof(
                UnsafeNativeMethods.sqlite3_index_constraint));

            for (int iConstraint = 0; iConstraint < nConstraint; iConstraint++)
            {
                UnsafeNativeMethods.sqlite3_index_constraint constraint =
................................................................................

                Marshal.PtrToStructure(IntPtrForOffset(pOrderBy,
                    iOrderBy * sizeOfOrderByType), orderBy);

                index.Inputs.OrderBys[iOrderBy] =
                    new SQLiteIndexOrderBy(orderBy);
            }















        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Populates the outputs of a pre-allocated native sqlite3_index_info
        /// structure using an existing <see cref="SQLiteIndex" /> object
        /// instance.
        /// </summary>
        /// <param name="index">
        /// The existing <see cref="SQLiteIndex" /> object instance containing
        /// the output data to use.
        /// </param>
        /// <param name="pIndex">
        /// The native pointer to the pre-allocated native sqlite3_index_info
        /// structure.
        /// </param>
        public static void IndexToIntPtr(
            SQLiteIndex index,
            IntPtr pIndex
            )
        {
            if ((index == null) || (index.Inputs == null) ||
                (index.Inputs.Constraints == null) ||
                (index.Outputs == null) ||
                (index.Outputs.ConstraintUsages == null))
            {
                return;
            }

            if (pIndex == IntPtr.Zero)
                return;
................................................................................

            if (nConstraint != index.Inputs.Constraints.Length)
                return;

            if (nConstraint != index.Outputs.ConstraintUsages.Length)
                return;

            offset += sizeof(int) + IntPtr.Size + sizeof(int) + IntPtr.Size;













            IntPtr pConstraintUsage = ReadIntPtr(pIndex, offset);



































            int sizeOfConstraintUsageType = Marshal.SizeOf(typeof(
                UnsafeNativeMethods.sqlite3_index_constraint_usage));

            for (int iConstraint = 0; iConstraint < nConstraint; iConstraint++)
            {
                UnsafeNativeMethods.sqlite3_index_constraint_usage constraintUsage =
                    new UnsafeNativeMethods.sqlite3_index_constraint_usage(
................................................................................
                Marshal.StructureToPtr(
                    constraintUsage, IntPtrForOffset(pConstraintUsage,
                    iConstraint * sizeOfConstraintUsageType), false);

                index.Outputs.ConstraintUsages[iConstraint] =
                    new SQLiteIndexConstraintUsage(constraintUsage);
            }

            offset += IntPtr.Size;

            WriteInt32(pIndex, offset, index.Outputs.IndexNumber);

            offset += sizeof(int);

            WriteIntPtr(pIndex, offset, SQLiteString.Utf8IntPtrFromString(
                index.Outputs.IndexString));

            offset += IntPtr.Size;

            WriteInt32(pIndex, offset, 1); /* NOTE: We just allocated it. */

            offset += sizeof(int);

            WriteInt32(pIndex, offset, index.Outputs.OrderByConsumed);

            offset += sizeof(int);

            WriteDouble(pIndex, offset, index.Outputs.EstimatedCost);
        }
        #endregion
    }
    #endregion

    ///////////////////////////////////////////////////////////////////////////

    #region SQLiteModule Base Class
    /// <summary>
    /// This class represents a managed virtual table module implementation.
    /// It is not sealed and must be used as the base class for any
    /// user-defined virtual table module classes implemented in managed code.
    /// </summary>
    public abstract class SQLiteModule :
            ISQLiteManagedModule, /*ISQLiteNativeModule,*/
            IDisposable /* NOT SEALED */
    {
        #region SQLiteNativeModule Private Class
        private sealed class SQLiteNativeModule :
                ISQLiteNativeModule, IDisposable
................................................................................
        ///////////////////////////////////////////////////////////////////////

        #region Public Constructors
        /// <summary>
        /// Constructs an instance of this class.
        /// </summary>
        /// <param name="name">
        /// The name of the module.  This parameter cannot be null.
        /// </param>
        public SQLiteModule(string name)
        {
            if (name == null)
                throw new ArgumentNullException("name");

            this.name = name;

Changes to System.Data.SQLite/SQLiteModuleEnumerable.cs.

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using System.Collections;
using System.Globalization;

namespace System.Data.SQLite
{
    #region SQLiteVirtualTableCursorEnumerable Class
    /* NOT SEALED */





    public class SQLiteVirtualTableCursorEnumerable : SQLiteVirtualTableCursor

    {
        #region Private Data




        private IEnumerator enumerator;







        private bool endOfEnumerator;
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region Public Constructors











        public SQLiteVirtualTableCursorEnumerable(
            SQLiteVirtualTable table,
            IEnumerator enumerator
            )
            : base(table)
        {
            this.enumerator = enumerator;
................................................................................
            this.endOfEnumerator = true;
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region Public Members









        public virtual bool MoveNext()
        {


            if (enumerator == null)
                return false;

            endOfEnumerator = !enumerator.MoveNext();
            return !endOfEnumerator;
        }

        ///////////////////////////////////////////////////////////////////////






        public virtual object Current
        {
            get
            {


                if (enumerator == null)
                    return null;

                return enumerator.Current;
            }
        }

        ///////////////////////////////////////////////////////////////////////






        public virtual void Reset()
        {


            if (enumerator == null)
                return;

            enumerator.Reset();
        }

        ///////////////////////////////////////////////////////////////////////





        public virtual bool EndOfEnumerator
        {
            get { return endOfEnumerator; }
        }

        ///////////////////////////////////////////////////////////////////////




        public virtual void Close()
        {


            if (enumerator != null)
                enumerator = null;
        }
        #endregion
    }
























































    #endregion



    ///////////////////////////////////////////////////////////////////////////

    #region SQLiteModuleEnumerable Class
    /* NOT SEALED */






    public class SQLiteModuleEnumerable : SQLiteModuleNoop
    {
        #region Private Constants




        private static readonly string declareSql = String.Format(
            CultureInfo.CurrentCulture, "CREATE TABLE {0}(x);",
            typeof(SQLiteModuleEnumerable).Name);
        #endregion

        ///////////////////////////////////////////////////////////////////////

................................................................................
        /// </summary>
        private IEnumerable enumerable;
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region Public Constructors










        public SQLiteModuleEnumerable(
            string name,
            IEnumerable enumerable
            )
            : base(name)
        {
            if (enumerable == null)
................................................................................
            this.enumerable = enumerable;
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region Protected Methods










        protected virtual SQLiteErrorCode CursorTypeMismatchError(
            SQLiteVirtualTableCursor cursor
            )
        {
            SetCursorError(cursor, "not an \"enumerable\" cursor");
            return SQLiteErrorCode.Error;
        }

        ///////////////////////////////////////////////////////////////////////











        protected virtual SQLiteErrorCode CursorEndOfEnumeratorError(
            SQLiteVirtualTableCursor cursor
            )
        {
            SetCursorError(cursor, "already hit end of enumerator");
            return SQLiteErrorCode.Error; 
        }

        ///////////////////////////////////////////////////////////////////////












        protected virtual string GetStringFromObject(
            object value
            )
        {
            if (value == null)
                return null;

            return value.ToString();
        }

        ///////////////////////////////////////////////////////////////////////










        protected virtual long GetRowIdFromObject(
            object value
            )
        {
            if (value == null)
                return 0;

            return value.GetHashCode();
        }

        ///////////////////////////////////////////////////////////////////////












        protected virtual bool CodeToEofResult(
            SQLiteErrorCode returnCode
            )
        {
            return (returnCode == SQLiteErrorCode.Ok) ? false : true;
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region ISQLiteManagedModule Members





















        public override SQLiteErrorCode Create(
            SQLiteConnection connection,
            IntPtr pClientData,
            string[] arguments,
            ref SQLiteVirtualTable table,
            ref string error
            )
................................................................................
            }

            return SQLiteErrorCode.Error;
        }

        ///////////////////////////////////////////////////////////////////////






















        public override SQLiteErrorCode Connect(
            SQLiteConnection connection,
            IntPtr pClientData,
            string[] arguments,
            ref SQLiteVirtualTable table,
            ref string error
            )
................................................................................
            }

            return SQLiteErrorCode.Error;
        }

        ///////////////////////////////////////////////////////////////////////













        public override SQLiteErrorCode BestIndex(
            SQLiteVirtualTable table,
            SQLiteIndex index
            )
        {
            CheckDisposed();

................................................................................
            }

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////










        public override SQLiteErrorCode Disconnect(
            SQLiteVirtualTable table
            )
        {
            CheckDisposed();

            table.Dispose();
            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////










        public override SQLiteErrorCode Destroy(
            SQLiteVirtualTable table
            )
        {
            CheckDisposed();

            table.Dispose();
            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////













        public override SQLiteErrorCode Open(
            SQLiteVirtualTable table,
            ref SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

................................................................................
                table, enumerable.GetEnumerator());

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////










        public override SQLiteErrorCode Close(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerable enumerableCursor =
................................................................................

            enumerableCursor.Close();
            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////



















        public override SQLiteErrorCode Filter(
            SQLiteVirtualTableCursor cursor,
            int indexNumber,
            string indexString,
            SQLiteValue[] values
            )
        {
................................................................................
            enumerableCursor.MoveNext(); /* IGNORED */

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////










        public override SQLiteErrorCode Next(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerable enumerableCursor =
................................................................................

            enumerableCursor.MoveNext(); /* IGNORED */
            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////










        public override bool Eof(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerable enumerableCursor =
................................................................................
                return CodeToEofResult(CursorTypeMismatchError(cursor));

            return enumerableCursor.EndOfEnumerator;
        }

        ///////////////////////////////////////////////////////////////////////
















        public override SQLiteErrorCode Column(
            SQLiteVirtualTableCursor cursor,
            SQLiteContext context,
            int index
            )
        {
            CheckDisposed();
................................................................................
                context.SetNull();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////













        public override SQLiteErrorCode RowId(
            SQLiteVirtualTableCursor cursor,
            ref long rowId
            )
        {
            CheckDisposed();

................................................................................

            rowId = GetRowIdFromObject(current);
            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////
















        public override SQLiteErrorCode Update(
            SQLiteVirtualTable table,
            SQLiteValue[] values,
            ref long rowId
            )
        {
            CheckDisposed();
................................................................................
                "virtual table \"{0}\" is read-only", table.TableName));

            return SQLiteErrorCode.Error;
        }

        ///////////////////////////////////////////////////////////////////////













        public override SQLiteErrorCode Rename(
            SQLiteVirtualTable table,
            string newName
            )
        {
            CheckDisposed();

................................................................................
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region IDisposable "Pattern" Members
        private bool disposed;




        private void CheckDisposed() /* throw */
        {
#if THROW_ON_DISPOSED
            if (disposed)
            {
                throw new ObjectDisposedException(
                    typeof(SQLiteModuleNoop).Name);
            }
#endif
        }

        ///////////////////////////////////////////////////////////////////////









        protected override void Dispose(bool disposing)
        {
            try
            {
                if (!disposed)
                {
                    //if (disposing)







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using System.Collections;
using System.Globalization;

namespace System.Data.SQLite
{
    #region SQLiteVirtualTableCursorEnumerable Class
    /// <summary>
    /// This class represents a virtual table cursor to be used with the
    /// <see cref="SQLiteModuleEnumerable" /> class.  It is not sealed and may
    /// be used as the base class for any user-defined virtual table cursor
    /// class that wraps an <see cref="IEnumerator" /> object instance.
    /// </summary>
    public class SQLiteVirtualTableCursorEnumerable :
            SQLiteVirtualTableCursor /* NOT SEALED */
    {
        #region Private Data
        /// <summary>
        /// The <see cref="IEnumerator" /> instance provided when this cursor
        /// was created.
        /// </summary>
        private IEnumerator enumerator;

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// This value will be non-zero if false has been returned from the
        /// <see cref="IEnumerator.MoveNext"/> method.
        /// </summary>
        private bool endOfEnumerator;
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region Public Constructors
        /// <summary>
        /// Constructs an instance of this class.
        /// </summary>
        /// <param name="table">
        /// The <see cref="SQLiteVirtualTable" /> object instance associated
        /// with this object instance.
        /// </param>
        /// <param name="enumerator">
        /// The <see cref="IEnumerator" /> instance to expose as a virtual
        /// table cursor.
        /// </param>
        public SQLiteVirtualTableCursorEnumerable(
            SQLiteVirtualTable table,
            IEnumerator enumerator
            )
            : base(table)
        {
            this.enumerator = enumerator;
................................................................................
            this.endOfEnumerator = true;
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region Public Members
        /// <summary>
        /// Advances to the next row of the virtual table cursor using the
        /// <see cref="IEnumerator.MoveNext" /> method of the
        /// <see cref="IEnumerator" /> object instance.
        /// </summary>
        /// <returns>
        /// Non-zero if the current row is valid; zero otherwise.  If zero is
        /// returned, no further rows are available.
        /// </returns>
        public virtual bool MoveNext()
        {
            CheckDisposed();

            if (enumerator == null)
                return false;

            endOfEnumerator = !enumerator.MoveNext();
            return !endOfEnumerator;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Returns the value for the current row of the virtual table cursor
        /// using the <see cref="IEnumerator.Current" /> property of the
        /// <see cref="IEnumerator" /> object instance.
        /// </summary>
        public virtual object Current
        {
            get
            {
                CheckDisposed();

                if (enumerator == null)
                    return null;

                return enumerator.Current;
            }
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Resets the virtual table cursor position, also invalidating the
        /// current row, using the <see cref="IEnumerator.Reset" /> method of
        /// the <see cref="IEnumerator" /> object instance.
        /// </summary>
        public virtual void Reset()
        {
            CheckDisposed();

            if (enumerator == null)
                return;

            enumerator.Reset();
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Returns non-zero if the end of the virtual table cursor has been
        /// seen (i.e. no more rows are available, including the current one).
        /// </summary>
        public virtual bool EndOfEnumerator
        {
            get { CheckDisposed(); return endOfEnumerator; }
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Closes the virtual table cursor.
        /// </summary>
        public virtual void Close()
        {
            // CheckDisposed();

            if (enumerator != null)
                enumerator = null;
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region IDisposable "Pattern" Members
        private bool disposed;
        /// <summary>
        /// Throws an <see cref="ObjectDisposedException"/> if this object
        /// instance has been disposed.
        /// </summary>
        private void CheckDisposed() /* throw */
        {
#if THROW_ON_DISPOSED
            if (disposed)
            {
                throw new ObjectDisposedException(
                    typeof(SQLiteVirtualTableCursorEnumerable).Name);
            }
#endif
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Disposes of this object instance.
        /// </summary>
        /// <param name="disposing">
        /// Non-zero if this method is being called from the
        /// <see cref="IDisposable.Dispose" /> method.  Zero if this method is
        /// being called from the finalizer.
        /// </param>
        protected override void Dispose(bool disposing)
        {
            try
            {
                if (!disposed)
                {
                    //if (disposing)
                    //{
                    //    ////////////////////////////////////
                    //    // dispose managed resources here...
                    //    ////////////////////////////////////
                    //}

                    //////////////////////////////////////
                    // release unmanaged resources here...
                    //////////////////////////////////////

                    Close();

                    disposed = true;
                }
            }
            finally
            {
                base.Dispose(disposing);
            }
        }
        #endregion
    }
    #endregion

    ///////////////////////////////////////////////////////////////////////////

    #region SQLiteModuleEnumerable Class

    /// <summary>
    /// This class implements a virtual table module that exposes an
    /// IEnumerable instance as a read-only virtual table.  It is not sealed
    /// and may be used as the base class for any user-defined virtual table
    /// class that wraps an <see cref="IEnumerable" /> object instance.
    /// </summary>
    public class SQLiteModuleEnumerable : SQLiteModuleNoop /* NOT SEALED */
    {
        #region Private Constants
        /// <summary>
        /// The CREATE TABLE statement used to declare the schema for the
        /// virtual table.
        /// </summary>
        private static readonly string declareSql = String.Format(
            CultureInfo.CurrentCulture, "CREATE TABLE {0}(x);",
            typeof(SQLiteModuleEnumerable).Name);
        #endregion

        ///////////////////////////////////////////////////////////////////////

................................................................................
        /// </summary>
        private IEnumerable enumerable;
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region Public Constructors
        /// <summary>
        /// Constructs an instance of this class.
        /// </summary>
        /// <param name="name">
        /// The name of the module.  This parameter cannot be null.
        /// </param>
        /// <param name="enumerable">
        /// The <see cref="IEnumerable" /> instance to expose as a virtual
        /// table.  This parameter cannot be null.
        /// </param>
        public SQLiteModuleEnumerable(
            string name,
            IEnumerable enumerable
            )
            : base(name)
        {
            if (enumerable == null)
................................................................................
            this.enumerable = enumerable;
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region Protected Methods
        /// <summary>
        /// Sets the table error message to one that indicates the virtual
        /// table cursor is of the wrong type.
        /// </summary>
        /// <param name="cursor">
        /// The <see cref="SQLiteVirtualTableCursor" /> object instance.
        /// </param>
        /// <returns>
        /// The value of <see cref="SQLiteErrorCode.Error"/>.
        /// </returns>
        protected virtual SQLiteErrorCode CursorTypeMismatchError(
            SQLiteVirtualTableCursor cursor
            )
        {
            SetCursorError(cursor, "not an \"enumerable\" cursor");
            return SQLiteErrorCode.Error;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Sets the table error message to one that indicates the virtual
        /// table cursor has no current row.
        /// </summary>
        /// <param name="cursor">
        /// The <see cref="SQLiteVirtualTableCursor" /> object instance.
        /// </param>
        /// <returns>
        /// The value of <see cref="SQLiteErrorCode.Error"/>.
        /// </returns>
        protected virtual SQLiteErrorCode CursorEndOfEnumeratorError(
            SQLiteVirtualTableCursor cursor
            )
        {
            SetCursorError(cursor, "already hit end of enumerator");
            return SQLiteErrorCode.Error; 
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Determines the string to return as the column value for the object
        /// instance value.
        /// </summary>
        /// <param name="value">
        /// The object instance to return a string representation for.
        /// </param>
        /// <returns>
        /// The string representation of the specified object instance or null
        /// upon failure.
        /// </returns>
        protected virtual string GetStringFromObject(
            object value
            )
        {
            if (value == null)
                return null;

            return value.ToString();
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Determines the unique row identifier for the object instance value.
        /// </summary>
        /// <param name="value">
        /// The object instance to return a unique row identifier for.
        /// </param>
        /// <returns>
        /// The unique row identifier or zero upon failure.
        /// </returns>
        protected virtual long GetRowIdFromObject(
            object value
            )
        {
            if (value == null)
                return 0;

            return value.GetHashCode();
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Converts a <see cref="SQLiteErrorCode" /> into a boolean return
        /// value for use with the <see cref="ISQLiteManagedModule.Eof" />
        /// method.
        /// </summary>
        /// <param name="returnCode">
        /// The <see cref="SQLiteErrorCode" /> value to convert.
        /// </param>
        /// <returns>
        /// The <see cref="Boolean" /> value.
        /// </returns>
        protected virtual bool CodeToEofResult(
            SQLiteErrorCode returnCode
            )
        {
            return (returnCode == SQLiteErrorCode.Ok) ? false : true;
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region ISQLiteManagedModule Members
        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Create" /> method.
        /// </summary>
        /// <param name="connection">
        /// See the <see cref="ISQLiteManagedModule.Create" /> method.
        /// </param>
        /// <param name="pClientData">
        /// See the <see cref="ISQLiteManagedModule.Create" /> method.
        /// </param>
        /// <param name="arguments">
        /// See the <see cref="ISQLiteManagedModule.Create" /> method.
        /// </param>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Create" /> method.
        /// </param>
        /// <param name="error">
        /// See the <see cref="ISQLiteManagedModule.Create" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Create" /> method.
        /// </returns>
        public override SQLiteErrorCode Create(
            SQLiteConnection connection,
            IntPtr pClientData,
            string[] arguments,
            ref SQLiteVirtualTable table,
            ref string error
            )
................................................................................
            }

            return SQLiteErrorCode.Error;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Connect" /> method.
        /// </summary>
        /// <param name="connection">
        /// See the <see cref="ISQLiteManagedModule.Connect" /> method.
        /// </param>
        /// <param name="pClientData">
        /// See the <see cref="ISQLiteManagedModule.Connect" /> method.
        /// </param>
        /// <param name="arguments">
        /// See the <see cref="ISQLiteManagedModule.Connect" /> method.
        /// </param>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Connect" /> method.
        /// </param>
        /// <param name="error">
        /// See the <see cref="ISQLiteManagedModule.Connect" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Connect" /> method.
        /// </returns>
        public override SQLiteErrorCode Connect(
            SQLiteConnection connection,
            IntPtr pClientData,
            string[] arguments,
            ref SQLiteVirtualTable table,
            ref string error
            )
................................................................................
            }

            return SQLiteErrorCode.Error;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.BestIndex" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.BestIndex" /> method.
        /// </param>
        /// <param name="index">
        /// See the <see cref="ISQLiteManagedModule.BestIndex" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.BestIndex" /> method.
        /// </returns>
        public override SQLiteErrorCode BestIndex(
            SQLiteVirtualTable table,
            SQLiteIndex index
            )
        {
            CheckDisposed();

................................................................................
            }

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Disconnect" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Disconnect" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Disconnect" /> method.
        /// </returns>
        public override SQLiteErrorCode Disconnect(
            SQLiteVirtualTable table
            )
        {
            CheckDisposed();

            table.Dispose();
            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Destroy" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Destroy" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Destroy" /> method.
        /// </returns>
        public override SQLiteErrorCode Destroy(
            SQLiteVirtualTable table
            )
        {
            CheckDisposed();

            table.Dispose();
            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Open" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Open" /> method.
        /// </param>
        /// <param name="cursor">
        /// See the <see cref="ISQLiteManagedModule.Open" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Open" /> method.
        /// </returns>
        public override SQLiteErrorCode Open(
            SQLiteVirtualTable table,
            ref SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

................................................................................
                table, enumerable.GetEnumerator());

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Close" /> method.
        /// </summary>
        /// <param name="cursor">
        /// See the <see cref="ISQLiteManagedModule.Close" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Close" /> method.
        /// </returns>
        public override SQLiteErrorCode Close(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerable enumerableCursor =
................................................................................

            enumerableCursor.Close();
            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Filter" /> method.
        /// </summary>
        /// <param name="cursor">
        /// See the <see cref="ISQLiteManagedModule.Filter" /> method.
        /// </param>
        /// <param name="indexNumber">
        /// See the <see cref="ISQLiteManagedModule.Filter" /> method.
        /// </param>
        /// <param name="indexString">
        /// See the <see cref="ISQLiteManagedModule.Filter" /> method.
        /// </param>
        /// <param name="values">
        /// See the <see cref="ISQLiteManagedModule.Filter" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Filter" /> method.
        /// </returns>
        public override SQLiteErrorCode Filter(
            SQLiteVirtualTableCursor cursor,
            int indexNumber,
            string indexString,
            SQLiteValue[] values
            )
        {
................................................................................
            enumerableCursor.MoveNext(); /* IGNORED */

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Next" /> method.
        /// </summary>
        /// <param name="cursor">
        /// See the <see cref="ISQLiteManagedModule.Next" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Next" /> method.
        /// </returns>
        public override SQLiteErrorCode Next(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerable enumerableCursor =
................................................................................

            enumerableCursor.MoveNext(); /* IGNORED */
            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Eof" /> method.
        /// </summary>
        /// <param name="cursor">
        /// See the <see cref="ISQLiteManagedModule.Eof" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Eof" /> method.
        /// </returns>
        public override bool Eof(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            SQLiteVirtualTableCursorEnumerable enumerableCursor =
................................................................................
                return CodeToEofResult(CursorTypeMismatchError(cursor));

            return enumerableCursor.EndOfEnumerator;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Column" /> method.
        /// </summary>
        /// <param name="cursor">
        /// See the <see cref="ISQLiteManagedModule.Column" /> method.
        /// </param>
        /// <param name="context">
        /// See the <see cref="ISQLiteManagedModule.Column" /> method.
        /// </param>
        /// <param name="index">
        /// See the <see cref="ISQLiteManagedModule.Column" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Column" /> method.
        /// </returns>
        public override SQLiteErrorCode Column(
            SQLiteVirtualTableCursor cursor,
            SQLiteContext context,
            int index
            )
        {
            CheckDisposed();
................................................................................
                context.SetNull();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.RowId" /> method.
        /// </summary>
        /// <param name="cursor">
        /// See the <see cref="ISQLiteManagedModule.RowId" /> method.
        /// </param>
        /// <param name="rowId">
        /// See the <see cref="ISQLiteManagedModule.RowId" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.RowId" /> method.
        /// </returns>
        public override SQLiteErrorCode RowId(
            SQLiteVirtualTableCursor cursor,
            ref long rowId
            )
        {
            CheckDisposed();

................................................................................

            rowId = GetRowIdFromObject(current);
            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Update" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Update" /> method.
        /// </param>
        /// <param name="values">
        /// See the <see cref="ISQLiteManagedModule.Update" /> method.
        /// </param>
        /// <param name="rowId">
        /// See the <see cref="ISQLiteManagedModule.Update" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Update" /> method.
        /// </returns>
        public override SQLiteErrorCode Update(
            SQLiteVirtualTable table,
            SQLiteValue[] values,
            ref long rowId
            )
        {
            CheckDisposed();
................................................................................
                "virtual table \"{0}\" is read-only", table.TableName));

            return SQLiteErrorCode.Error;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Rename" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Rename" /> method.
        /// </param>
        /// <param name="newName">
        /// See the <see cref="ISQLiteManagedModule.Rename" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Rename" /> method.
        /// </returns>
        public override SQLiteErrorCode Rename(
            SQLiteVirtualTable table,
            string newName
            )
        {
            CheckDisposed();

................................................................................
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region IDisposable "Pattern" Members
        private bool disposed;
        /// <summary>
        /// Throws an <see cref="ObjectDisposedException"/> if this object
        /// instance has been disposed.
        /// </summary>
        private void CheckDisposed() /* throw */
        {
#if THROW_ON_DISPOSED
            if (disposed)
            {
                throw new ObjectDisposedException(
                    typeof(SQLiteModuleNoop).Name);
            }
#endif
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Disposes of this object instance.
        /// </summary>
        /// <param name="disposing">
        /// Non-zero if this method is being called from the
        /// <see cref="IDisposable.Dispose" /> method.  Zero if this method is
        /// being called from the finalizer.
        /// </param>
        protected override void Dispose(bool disposing)
        {
            try
            {
                if (!disposed)
                {
                    //if (disposing)

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 * Written by Joe Mistachkin (joe@mistachkin.com)
 *
 * Released to the public domain, use at your own risk!
 ********************************************************/

namespace System.Data.SQLite
{



    public class SQLiteModuleNoop : SQLiteModule
    {
        #region Public Constructors






        public SQLiteModuleNoop(
            string name
            )
            : base(name)
        {
            // do nothing.
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region ISQLiteManagedModule Members





















        public override SQLiteErrorCode Create(
            SQLiteConnection connection,
            IntPtr pClientData,
            string[] arguments,
            ref SQLiteVirtualTable table,
            ref string error
            )
................................................................................
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////






















        public override SQLiteErrorCode Connect(
            SQLiteConnection connection,
            IntPtr pClientData,
            string[] arguments,
            ref SQLiteVirtualTable table,
            ref string error
            )
................................................................................
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////













        public override SQLiteErrorCode BestIndex(
            SQLiteVirtualTable table,
            SQLiteIndex index
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////










        public override SQLiteErrorCode Disconnect(
            SQLiteVirtualTable table
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////










        public override SQLiteErrorCode Destroy(
            SQLiteVirtualTable table
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////













        public override SQLiteErrorCode Open(
            SQLiteVirtualTable table,
            ref SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////










        public override SQLiteErrorCode Close(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////



















        public override SQLiteErrorCode Filter(
            SQLiteVirtualTableCursor cursor,
            int indexNumber,
            string indexString,
            SQLiteValue[] values
            )
        {
................................................................................
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////










        public override SQLiteErrorCode Next(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////










        public override bool Eof(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            return true;
        }

        ///////////////////////////////////////////////////////////////////////
















        public override SQLiteErrorCode Column(
            SQLiteVirtualTableCursor cursor,
            SQLiteContext context,
            int index
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////













        public override SQLiteErrorCode RowId(
            SQLiteVirtualTableCursor cursor,
            ref long rowId
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////
















        public override SQLiteErrorCode Update(
            SQLiteVirtualTable table,
            SQLiteValue[] values,
            ref long rowId
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////










        public override SQLiteErrorCode Begin(
            SQLiteVirtualTable table
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////










        public override SQLiteErrorCode Sync(
            SQLiteVirtualTable table
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////










        public override SQLiteErrorCode Commit(
            SQLiteVirtualTable table
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////










        public override SQLiteErrorCode Rollback(
            SQLiteVirtualTable table
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////






















        public override bool FindFunction(
            SQLiteVirtualTable table,
            int argumentCount,
            string name,
            ref SQLiteFunction function,
            ref IntPtr pClientData
            )
................................................................................
            CheckDisposed();

            return false;
        }

        ///////////////////////////////////////////////////////////////////////













        public override SQLiteErrorCode Rename(
            SQLiteVirtualTable table,
            string newName
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////













        public override SQLiteErrorCode Savepoint(
            SQLiteVirtualTable table,
            int savepoint
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////













        public override SQLiteErrorCode Release(
            SQLiteVirtualTable table,
            int savepoint
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////













        public override SQLiteErrorCode RollbackTo(
            SQLiteVirtualTable table,
            int savepoint
            )
        {
            CheckDisposed();

................................................................................
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region IDisposable "Pattern" Members
        private bool disposed;




        private void CheckDisposed() /* throw */
        {
#if THROW_ON_DISPOSED
            if (disposed)
            {
                throw new ObjectDisposedException(
                    typeof(SQLiteModuleNoop).Name);
            }
#endif
        }

        ///////////////////////////////////////////////////////////////////////









        protected override void Dispose(bool disposing)
        {
            try
            {
                if (!disposed)
                {
                    //if (disposing)







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 * Written by Joe Mistachkin (joe@mistachkin.com)
 *
 * Released to the public domain, use at your own risk!
 ********************************************************/

namespace System.Data.SQLite
{
    /// <summary>
    /// This class implements a virtual table module that does nothing.
    /// </summary>
    public class SQLiteModuleNoop : SQLiteModule /* NOT SEALED */
    {
        #region Public Constructors
        /// <summary>
        /// Constructs an instance of this class.
        /// </summary>
        /// <param name="name">
        /// The name of the module.  This parameter cannot be null.
        /// </param>
        public SQLiteModuleNoop(
            string name
            )
            : base(name)
        {
            // do nothing.
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region ISQLiteManagedModule Members
        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Create" /> method.
        /// </summary>
        /// <param name="connection">
        /// See the <see cref="ISQLiteManagedModule.Create" /> method.
        /// </param>
        /// <param name="pClientData">
        /// See the <see cref="ISQLiteManagedModule.Create" /> method.
        /// </param>
        /// <param name="arguments">
        /// See the <see cref="ISQLiteManagedModule.Create" /> method.
        /// </param>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Create" /> method.
        /// </param>
        /// <param name="error">
        /// See the <see cref="ISQLiteManagedModule.Create" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Create" /> method.
        /// </returns>
        public override SQLiteErrorCode Create(
            SQLiteConnection connection,
            IntPtr pClientData,
            string[] arguments,
            ref SQLiteVirtualTable table,
            ref string error
            )
................................................................................
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Connect" /> method.
        /// </summary>
        /// <param name="connection">
        /// See the <see cref="ISQLiteManagedModule.Connect" /> method.
        /// </param>
        /// <param name="pClientData">
        /// See the <see cref="ISQLiteManagedModule.Connect" /> method.
        /// </param>
        /// <param name="arguments">
        /// See the <see cref="ISQLiteManagedModule.Connect" /> method.
        /// </param>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Connect" /> method.
        /// </param>
        /// <param name="error">
        /// See the <see cref="ISQLiteManagedModule.Connect" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Connect" /> method.
        /// </returns>
        public override SQLiteErrorCode Connect(
            SQLiteConnection connection,
            IntPtr pClientData,
            string[] arguments,
            ref SQLiteVirtualTable table,
            ref string error
            )
................................................................................
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.BestIndex" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.BestIndex" /> method.
        /// </param>
        /// <param name="index">
        /// See the <see cref="ISQLiteManagedModule.BestIndex" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.BestIndex" /> method.
        /// </returns>
        public override SQLiteErrorCode BestIndex(
            SQLiteVirtualTable table,
            SQLiteIndex index
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Disconnect" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Disconnect" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Disconnect" /> method.
        /// </returns>
        public override SQLiteErrorCode Disconnect(
            SQLiteVirtualTable table
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Destroy" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Destroy" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Destroy" /> method.
        /// </returns>
        public override SQLiteErrorCode Destroy(
            SQLiteVirtualTable table
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Open" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Open" /> method.
        /// </param>
        /// <param name="cursor">
        /// See the <see cref="ISQLiteManagedModule.Open" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Open" /> method.
        /// </returns>
        public override SQLiteErrorCode Open(
            SQLiteVirtualTable table,
            ref SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Close" /> method.
        /// </summary>
        /// <param name="cursor">
        /// See the <see cref="ISQLiteManagedModule.Close" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Close" /> method.
        /// </returns>
        public override SQLiteErrorCode Close(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Filter" /> method.
        /// </summary>
        /// <param name="cursor">
        /// See the <see cref="ISQLiteManagedModule.Filter" /> method.
        /// </param>
        /// <param name="indexNumber">
        /// See the <see cref="ISQLiteManagedModule.Filter" /> method.
        /// </param>
        /// <param name="indexString">
        /// See the <see cref="ISQLiteManagedModule.Filter" /> method.
        /// </param>
        /// <param name="values">
        /// See the <see cref="ISQLiteManagedModule.Filter" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Filter" /> method.
        /// </returns>
        public override SQLiteErrorCode Filter(
            SQLiteVirtualTableCursor cursor,
            int indexNumber,
            string indexString,
            SQLiteValue[] values
            )
        {
................................................................................
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Next" /> method.
        /// </summary>
        /// <param name="cursor">
        /// See the <see cref="ISQLiteManagedModule.Next" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Next" /> method.
        /// </returns>
        public override SQLiteErrorCode Next(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Eof" /> method.
        /// </summary>
        /// <param name="cursor">
        /// See the <see cref="ISQLiteManagedModule.Eof" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Eof" /> method.
        /// </returns>
        public override bool Eof(
            SQLiteVirtualTableCursor cursor
            )
        {
            CheckDisposed();

            return true;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Column" /> method.
        /// </summary>
        /// <param name="cursor">
        /// See the <see cref="ISQLiteManagedModule.Column" /> method.
        /// </param>
        /// <param name="context">
        /// See the <see cref="ISQLiteManagedModule.Column" /> method.
        /// </param>
        /// <param name="index">
        /// See the <see cref="ISQLiteManagedModule.Column" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Column" /> method.
        /// </returns>
        public override SQLiteErrorCode Column(
            SQLiteVirtualTableCursor cursor,
            SQLiteContext context,
            int index
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.RowId" /> method.
        /// </summary>
        /// <param name="cursor">
        /// See the <see cref="ISQLiteManagedModule.RowId" /> method.
        /// </param>
        /// <param name="rowId">
        /// See the <see cref="ISQLiteManagedModule.RowId" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.RowId" /> method.
        /// </returns>
        public override SQLiteErrorCode RowId(
            SQLiteVirtualTableCursor cursor,
            ref long rowId
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Update" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Update" /> method.
        /// </param>
        /// <param name="values">
        /// See the <see cref="ISQLiteManagedModule.Update" /> method.
        /// </param>
        /// <param name="rowId">
        /// See the <see cref="ISQLiteManagedModule.Update" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Update" /> method.
        /// </returns>
        public override SQLiteErrorCode Update(
            SQLiteVirtualTable table,
            SQLiteValue[] values,
            ref long rowId
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Begin" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Begin" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Begin" /> method.
        /// </returns>
        public override SQLiteErrorCode Begin(
            SQLiteVirtualTable table
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Sync" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Sync" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Sync" /> method.
        /// </returns>
        public override SQLiteErrorCode Sync(
            SQLiteVirtualTable table
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Commit" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Commit" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Commit" /> method.
        /// </returns>
        public override SQLiteErrorCode Commit(
            SQLiteVirtualTable table
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Rollback" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Rollback" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Rollback" /> method.
        /// </returns>
        public override SQLiteErrorCode Rollback(
            SQLiteVirtualTable table
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.FindFunction" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.FindFunction" /> method.
        /// </param>
        /// <param name="argumentCount">
        /// See the <see cref="ISQLiteManagedModule.FindFunction" /> method.
        /// </param>
        /// <param name="name">
        /// See the <see cref="ISQLiteManagedModule.FindFunction" /> method.
        /// </param>
        /// <param name="function">
        /// See the <see cref="ISQLiteManagedModule.FindFunction" /> method.
        /// </param>
        /// <param name="pClientData">
        /// See the <see cref="ISQLiteManagedModule.FindFunction" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.FindFunction" /> method.
        /// </returns>
        public override bool FindFunction(
            SQLiteVirtualTable table,
            int argumentCount,
            string name,
            ref SQLiteFunction function,
            ref IntPtr pClientData
            )
................................................................................
            CheckDisposed();

            return false;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Rename" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Rename" /> method.
        /// </param>
        /// <param name="newName">
        /// See the <see cref="ISQLiteManagedModule.Rename" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Rename" /> method.
        /// </returns>
        public override SQLiteErrorCode Rename(
            SQLiteVirtualTable table,
            string newName
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Savepoint" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Savepoint" /> method.
        /// </param>
        /// <param name="savepoint">
        /// See the <see cref="ISQLiteManagedModule.Savepoint" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Savepoint" /> method.
        /// </returns>
        public override SQLiteErrorCode Savepoint(
            SQLiteVirtualTable table,
            int savepoint
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.Release" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.Release" /> method.
        /// </param>
        /// <param name="savepoint">
        /// See the <see cref="ISQLiteManagedModule.Release" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.Release" /> method.
        /// </returns>
        public override SQLiteErrorCode Release(
            SQLiteVirtualTable table,
            int savepoint
            )
        {
            CheckDisposed();

            return SQLiteErrorCode.Ok;
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// See the <see cref="ISQLiteManagedModule.RollbackTo" /> method.
        /// </summary>
        /// <param name="table">
        /// See the <see cref="ISQLiteManagedModule.RollbackTo" /> method.
        /// </param>
        /// <param name="savepoint">
        /// See the <see cref="ISQLiteManagedModule.RollbackTo" /> method.
        /// </param>
        /// <returns>
        /// See the <see cref="ISQLiteManagedModule.RollbackTo" /> method.
        /// </returns>
        public override SQLiteErrorCode RollbackTo(
            SQLiteVirtualTable table,
            int savepoint
            )
        {
            CheckDisposed();

................................................................................
        }
        #endregion

        ///////////////////////////////////////////////////////////////////////

        #region IDisposable "Pattern" Members
        private bool disposed;
        /// <summary>
        /// Throws an <see cref="ObjectDisposedException"/> if this object
        /// instance has been disposed.
        /// </summary>
        private void CheckDisposed() /* throw */
        {
#if THROW_ON_DISPOSED
            if (disposed)
            {
                throw new ObjectDisposedException(
                    typeof(SQLiteModuleNoop).Name);
            }
#endif
        }

        ///////////////////////////////////////////////////////////////////////

        /// <summary>
        /// Disposes of this object instance.
        /// </summary>
        /// <param name="disposing">
        /// Non-zero if this method is being called from the
        /// <see cref="IDisposable.Dispose" /> method.  Zero if this method is
        /// being called from the finalizer.
        /// </param>
        protected override void Dispose(bool disposing)
        {
            try
            {
                if (!disposed)
                {
                    //if (disposing)