System.Data.SQLite

            string typeName = UnsafeNativeMethods.GetSettingValue(
                "TypeName_SQLiteProviderServices", null);

            Version version = this.GetType().Assembly.GetName().Version;

            if (typeName != null)
            {
                typeName = UnsafeNativeMethods.StringFormat(
                    CultureInfo.InvariantCulture, typeName, version);
            }
            else
            {
                typeName = UnsafeNativeMethods.StringFormat(
                    CultureInfo.InvariantCulture, DefaultTypeName, version);
            }

            Type type = Type.GetType(typeName, false);

            if (type != null)
            {

              if (SQLiteBase.ResetConnection(_sql, _sql, canThrow))
              {
                  if (unbindFunctions)
                  {
                      if (SQLiteFunction.UnbindAllFunctions(this, _flags, false))
                      {
#if !NET_COMPACT_20 && TRACE_CONNECTION
                          Trace.WriteLine(UnsafeNativeMethods.StringFormat(
                              CultureInfo.CurrentCulture,
                              "UnbindFunctions (Pool) Success: {0}",
                              HandleToString()));
#endif
                      }
                      else
                      {
#if !NET_COMPACT_20 && TRACE_CONNECTION
                          Trace.WriteLine(UnsafeNativeMethods.StringFormat(
                              CultureInfo.CurrentCulture,
                              "UnbindFunctions (Pool) Failure: {0}",
                              HandleToString()));
#endif
                      }
                  }

#if INTEROP_VIRTUAL_TABLE
                  DisposeModules();
#endif

                  SQLiteConnectionPool.Add(_fileName, _sql, _poolVersion);

                  SQLiteConnection.OnChanged(null, new ConnectionEventArgs(
                      SQLiteConnectionEventType.ClosedToPool, null, null,
                      null, null, _sql, _fileName, new object[] {
                      typeof(SQLite3), canThrow, _fileName, _poolVersion }));

#if !NET_COMPACT_20 && TRACE_CONNECTION
                  Trace.WriteLine(UnsafeNativeMethods.StringFormat(
                      CultureInfo.CurrentCulture,
                      "Close (Pool) Success: {0}",
                      HandleToString()));
#endif
              }
#if !NET_COMPACT_20 && TRACE_CONNECTION
              else
              {
                  Trace.WriteLine(UnsafeNativeMethods.StringFormat(
                      CultureInfo.CurrentCulture,
                      "Close (Pool) Failure: {0}",
                      HandleToString()));
              }
#endif
          }
          else
          {
              if (unbindFunctions)
              {
                  if (SQLiteFunction.UnbindAllFunctions(this, _flags, false))
                  {
#if !NET_COMPACT_20 && TRACE_CONNECTION
                      Trace.WriteLine(UnsafeNativeMethods.StringFormat(
                          CultureInfo.CurrentCulture,
                          "UnbindFunctions Success: {0}",
                          HandleToString()));
#endif
                  }
                  else
                  {
#if !NET_COMPACT_20 && TRACE_CONNECTION
                      Trace.WriteLine(UnsafeNativeMethods.StringFormat(
                          CultureInfo.CurrentCulture,
                          "UnbindFunctions Failure: {0}",
                          HandleToString()));
#endif
                  }
              }

        SQLiteConnection.OnChanged(null, new ConnectionEventArgs(
            SQLiteConnectionEventType.OpenedFromPool, null, null,
            null, null, _sql, strFilename, new object[] {
            typeof(SQLite3), strFilename, vfsName, connectionFlags,
            openFlags, maxPoolSize, usePool, _poolVersion }));

#if !NET_COMPACT_20 && TRACE_CONNECTION
        Trace.WriteLine(UnsafeNativeMethods.StringFormat(
            CultureInfo.CurrentCulture,
            "Open (Pool): {0}", HandleToString()));
#endif
      }

      if (_sql == null)
      {

          else
#endif
          {
            n = UnsafeNativeMethods.sqlite3_open_v2(ToUTF8(strFilename), ref db, openFlags, ToUTF8(vfsName));
          }

#if !NET_COMPACT_20 && TRACE_CONNECTION
          Trace.WriteLine(UnsafeNativeMethods.StringFormat(
              CultureInfo.CurrentCulture,
              "Open: {0}", db));
#endif

          if (n != SQLiteErrorCode.Ok) throw new SQLiteException(n, null);
          _sql = new SQLiteConnectionHandle(db, true);
        }

        //       data classes.
        //
        string baseSchemaName = (cnn != null) ? cnn._baseSchemaName : null;

        if (!String.IsNullOrEmpty(baseSchemaName))
        {
          strSql = strSql.Replace(
              UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture,
              "[{0}].", baseSchemaName), String.Empty);

          strSql = strSql.Replace(
              UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture,
              "{0}.", baseSchemaName), String.Empty);
        }
      }

      SQLiteConnectionFlags flags =
          (cnn != null) ? cnn.Flags : SQLiteConnectionFlags.Default;

      if (
#if !PLATFORM_COMPACTFRAMEWORK
          ForceLogPrepare() ||
#endif
          ((flags & SQLiteConnectionFlags.LogPrepare) == SQLiteConnectionFlags.LogPrepare))
      {
          if ((strSql == null) || (strSql.Length == 0) || (strSql.Trim().Length == 0))
              SQLiteLog.LogMessage("Preparing {<nothing>}...");
          else
              SQLiteLog.LogMessage(UnsafeNativeMethods.StringFormat(
                  CultureInfo.CurrentCulture, "Preparing {{{0}}}...", strSql));
      }

      IntPtr stmt = IntPtr.Zero;
      IntPtr ptr = IntPtr.Zero;
      int len = 0;
      SQLiteErrorCode n = SQLiteErrorCode.Schema;

#else
            n = UnsafeNativeMethods.sqlite3_prepare(_sql, psql, b.Length - 1, ref stmt, ref ptr);
#endif
            len = -1;
#endif

#if !NET_COMPACT_20 && TRACE_STATEMENT
            Trace.WriteLine(UnsafeNativeMethods.StringFormat(
                CultureInfo.CurrentCulture,
                "Prepare ({0}): {1}", n, stmt));
#endif

            if ((n == SQLiteErrorCode.Ok) && (stmt != IntPtr.Zero))
            {
              if (statementHandle != null) statementHandle.Dispose();

      }
    }

    protected static void LogBind(SQLiteStatementHandle handle, int index)
    {
        IntPtr handleIntPtr = handle;

        SQLiteLog.LogMessage(UnsafeNativeMethods.StringFormat(
            CultureInfo.CurrentCulture,
            "Binding statement {0} paramter #{1} as NULL...",
            handleIntPtr, index));
    }

    protected static void LogBind(SQLiteStatementHandle handle, int index, ValueType value)
    {
        IntPtr handleIntPtr = handle;

        SQLiteLog.LogMessage(UnsafeNativeMethods.StringFormat(
            CultureInfo.CurrentCulture,
            "Binding statement {0} paramter #{1} as type {2} with value {{{3}}}...",
            handleIntPtr, index, value.GetType(), value));
    }

    private static string FormatDateTime(DateTime value)
    {
        StringBuilder result = new StringBuilder();

        return result.ToString();
    }

    protected static void LogBind(SQLiteStatementHandle handle, int index, DateTime value)
    {
        IntPtr handleIntPtr = handle;

        SQLiteLog.LogMessage(UnsafeNativeMethods.StringFormat(
            CultureInfo.CurrentCulture,
            "Binding statement {0} paramter #{1} as type {2} with value {{{3}}}...",
            handleIntPtr, index, typeof(DateTime), FormatDateTime(value)));
    }

    protected static void LogBind(SQLiteStatementHandle handle, int index, string value)
    {
        IntPtr handleIntPtr = handle;

        SQLiteLog.LogMessage(UnsafeNativeMethods.StringFormat(
            CultureInfo.CurrentCulture,
            "Binding statement {0} paramter #{1} as type {2} with value {{{3}}}...",
            handleIntPtr, index, typeof(String), (value != null) ? value : "<null>"));
    }

    private static string ToHexadecimalString(
        byte[] array
        )

        return result.ToString();
    }

    protected static void LogBind(SQLiteStatementHandle handle, int index, byte[] value)
    {
        IntPtr handleIntPtr = handle;

        SQLiteLog.LogMessage(UnsafeNativeMethods.StringFormat(
            CultureInfo.CurrentCulture,
            "Binding statement {0} paramter #{1} as type {2} with value {{{3}}}...",
            handleIntPtr, index, typeof(Byte[]), (value != null) ? ToHexadecimalString(value) : "<null>"));
    }

    internal override void Bind_Double(SQLiteStatement stmt, SQLiteConnectionFlags flags, int index, double value)
    {
        SQLiteStatementHandle handle = stmt._sqlite_stmt;

        SQLiteStatementHandle handle = stmt._sqlite_stmt;
        int value = UnsafeNativeMethods.sqlite3_bind_parameter_count(handle);

        if ((flags & SQLiteConnectionFlags.LogBind) == SQLiteConnectionFlags.LogBind)
        {
            IntPtr handleIntPtr = handle;

            SQLiteLog.LogMessage(UnsafeNativeMethods.StringFormat(
                CultureInfo.CurrentCulture,
                "Statement {0} paramter count is {1}.",
                handleIntPtr, value));
        }

        return value;
    }

        name = UTF8ToString(UnsafeNativeMethods.sqlite3_bind_parameter_name(handle, index), -1);
#endif

        if ((flags & SQLiteConnectionFlags.LogBind) == SQLiteConnectionFlags.LogBind)
        {
            IntPtr handleIntPtr = handle;

            SQLiteLog.LogMessage(UnsafeNativeMethods.StringFormat(
                CultureInfo.CurrentCulture,
                "Statement {0} paramter #{1} name is {{{2}}}.",
                handleIntPtr, index, name));
        }

        return name;
    }

    internal override int Bind_ParamIndex(SQLiteStatement stmt, SQLiteConnectionFlags flags, string paramName)
    {
        SQLiteStatementHandle handle = stmt._sqlite_stmt;
        int index = UnsafeNativeMethods.sqlite3_bind_parameter_index(handle, ToUTF8(paramName));

        if ((flags & SQLiteConnectionFlags.LogBind) == SQLiteConnectionFlags.LogBind)
        {
            IntPtr handleIntPtr = handle;

            SQLiteLog.LogMessage(UnsafeNativeMethods.StringFormat(
                CultureInfo.CurrentCulture,
                "Statement {0} paramter index of name {{{1}}} is #{2}.",
                handleIntPtr, paramName, index));
        }

        return index;
    }

            _modules.Add(module.Name, module);

            if (_usePool)
            {
                _usePool = false;

#if !NET_COMPACT_20 && TRACE_CONNECTION
                Trace.WriteLine(UnsafeNativeMethods.StringFormat(
                    CultureInfo.CurrentCulture,
                    "CreateModule (Pool) Disabled: {0}",
                    HandleToString()));
#endif
            }
        }
        else

namespace System.Data.SQLite
{
  using System;
  using System.Collections.Generic;

#if !NET_COMPACT_20 && TRACE_CONNECTION
  using System.Diagnostics;

#endif

  using System.Globalization;
  using System.IO;
  using System.Runtime.InteropServices;


  /// <summary>
  /// Alternate SQLite3 object, overriding many text behaviors to support UTF-16 (Unicode)
  /// </summary>
  internal sealed class SQLite3_UTF16 : SQLite3
  {
    /// <summary>

            SQLiteConnectionEventType.OpenedFromPool, null, null,
            null, null, _sql, strFilename, new object[] {
            typeof(SQLite3_UTF16), strFilename, vfsName,
            connectionFlags, openFlags, maxPoolSize, usePool,
            _poolVersion }));

#if !NET_COMPACT_20 && TRACE_CONNECTION
        Trace.WriteLine(UnsafeNativeMethods.StringFormat(
            CultureInfo.CurrentCulture,
            "Open16 (Pool): {0}",
            HandleToString()));
#endif
      }

      if (_sql == null)

            //       a flags parameter.
            //
            if (((openFlags & SQLiteOpenFlagsEnum.Create) != SQLiteOpenFlagsEnum.Create) && !File.Exists(strFilename))
              throw new SQLiteException(SQLiteErrorCode.CantOpen, strFilename);

            if (vfsName != null)
            {
              throw new SQLiteException(SQLiteErrorCode.CantOpen, UnsafeNativeMethods.StringFormat(
                CultureInfo.CurrentCulture,
                "cannot open using UTF-16 and VFS \"{0}\": need interop assembly", vfsName));
            }

            n = UnsafeNativeMethods.sqlite3_open16(strFilename, ref db);
          }

#if !NET_COMPACT_20 && TRACE_CONNECTION
          Trace.WriteLine(UnsafeNativeMethods.StringFormat(
              CultureInfo.CurrentCulture,
              "Open16: {0}", db));
#endif

          if (n != SQLiteErrorCode.Ok) throw new SQLiteException(n, null);
          _sql = new SQLiteConnectionHandle(db, true);
        }

    /// <summary>
    /// Returns a valid named parameter
    /// </summary>
    /// <param name="parameterName">The name of the parameter</param>
    /// <returns>Error</returns>
    protected override string GetParameterName(string parameterName)
    {
      return UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "@{0}", parameterName);
    }

    /// <summary>
    /// Returns a named parameter for the given ordinal
    /// </summary>
    /// <param name="parameterOrdinal">The i of the parameter</param>
    /// <returns>Error</returns>
    protected override string GetParameterName(int parameterOrdinal)
    {
      return UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "@param{0}", parameterOrdinal);
    }

    /// <summary>
    /// Returns a placeholder character for the specified parameter i.
    /// </summary>
    /// <param name="parameterOrdinal">The index of the parameter to provide a placeholder for</param>
    /// <returns>Returns a named parameter</returns>

          {
            string str = row[0].ToString();
            if (String.Compare(str, "main", StringComparison.OrdinalIgnoreCase) != 0
              && String.Compare(str, "temp", StringComparison.OrdinalIgnoreCase) != 0)
            {
              using (SQLiteCommand cmd = CreateCommand())
              {
                cmd.CommandText = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "ATTACH DATABASE '{0}' AS [{1}]", row[1], row[0]);
                cmd.ExecuteNonQuery();
              }
            }
          }
        }
      }
    }

                    break;
            }
        }
        catch (Exception e)
        {
            if ((_flags & SQLiteConnectionFlags.LogBackup) == SQLiteConnectionFlags.LogBackup)
            {
                SQLiteLog.LogMessage(UnsafeNativeMethods.StringFormat(
                    CultureInfo.CurrentCulture,
                    "Caught exception while backing up database: {0}", e));
            }

            throw;
        }
        finally

    protected override void Dispose(bool disposing)
    {
#if !NET_COMPACT_20 && TRACE_WARNING
        if ((_flags & SQLiteConnectionFlags.TraceWarning) == SQLiteConnectionFlags.TraceWarning)
        {
            if (_noDispose)
            {
                System.Diagnostics.Trace.WriteLine(UnsafeNativeMethods.StringFormat(
                    CultureInfo.CurrentCulture,
                    "WARNING: Disposing of connection \"{0}\" with the no-dispose flag set.",
                    _connectionString));
            }
        }
#endif

      if (UnsafeNativeMethods.GetSettingValue("No_SQLiteConnectionNewParser", null) != null)
          arParts = SQLiteConvert.Split(s, ';');
      else
          arParts = SQLiteConvert.NewSplit(s, ';', true, ref error);

      if (arParts == null)
      {
          throw new ArgumentException(UnsafeNativeMethods.StringFormat(
              CultureInfo.CurrentCulture,
              "Invalid ConnectionString format, cannot parse: {0}", (error != null) ?
              error : "could not split connection string into properties"));
      }

      int x = (arParts != null) ? arParts.Length : 0;
      // For each semi-colon piece, split into key and value pairs by the presence of the = sign
      for (n = 0; n < x; n++)

        int indexOf = arParts[n].IndexOf('=');

        if (indexOf != -1)
          ls.Add(UnwrapString(arParts[n].Substring(0, indexOf).Trim()), UnwrapString(arParts[n].Substring(indexOf + 1).Trim()));
        else if (allowNameOnly)
          ls.Add(UnwrapString(arParts[n].Trim()), String.Empty);
        else
          throw new ArgumentException(UnsafeNativeMethods.StringFormat(CultureInfo.CurrentCulture, "Invalid ConnectionString format for part \"{0}\", no equal sign found", arParts[n]));
      }
      return ls;
    }

    /// <summary>
    /// Parses a connection string using the built-in (i.e. framework provided)
    /// connection string parser class and returns the key/value pairs.  An

    public void EnableExtensions(
        bool enable
        )
    {
        CheckDisposed();

        if (_sql == null)
            throw new InvalidOperationException(UnsafeNativeMethods.StringFormat(
                CultureInfo.CurrentCulture,
                "Database connection not valid for {0} extensions.",
                enable ? "enabling" : "disabling"));

        if ((_flags & SQLiteConnectionFlags.NoLoadExtension) == SQLiteConnectionFlags.NoLoadExtension)
            throw new SQLiteException("Loading extensions is disabled for this database connection.");

        StringBuilder result = new StringBuilder();

        int length = array.Length;

        for (int index = 0; index < length; index++)
#if NET_COMPACT_20
            result.Append(UnsafeNativeMethods.StringFormat("{0:x2}", array[index]));
#else
            result.AppendFormat("{0:x2}", array[index]);
#endif

        return result.ToString();
    }

        for (int index = 0; index < text.Length; index += 2)
        {
            string value = text.Substring(index, 2);

            if (!TryParseByte(value,
                    NumberStyles.HexNumber, out result[index / 2]))
            {
                error = UnsafeNativeMethods.StringFormat(
                    CultureInfo.CurrentCulture,
                    "string contains \"{0}\", which cannot be converted to a byte value",
                    value);

                return null;
            }
        }

#if !NET_COMPACT_20 && TRACE_WARNING
      bool uri = false;
#endif
      bool fullUri = false;
      string fileName;

      if (Convert.ToInt32(FindKey(opts, "Version", DefaultVersion.ToString()), CultureInfo.InvariantCulture) != DefaultVersion)
        throw new NotSupportedException(UnsafeNativeMethods.StringFormat(CultureInfo.CurrentCulture, "Only SQLite Version {0} is supported at this time", DefaultVersion));

#if INTEROP_INCLUDE_ZIPVFS
      bool useZipVfs = false;
      string zipVfsVersion = FindKey(opts, "ZipVfsVersion", DefaultZipVfsVersion);

      if (zipVfsVersion != null)
      {

          else if (String.Compare(zipVfsVersion, ZipVfs_V3) == 0)
          {
              UnsafeNativeMethods.zipvfsInit_v3(0);
              useZipVfs = true;
          }
          else
          {
              throw new NotSupportedException(UnsafeNativeMethods.StringFormat(
                  CultureInfo.CurrentCulture, "Only ZipVFS versions {0}, {1}, and {2} are supported at this time",
                  ZipVfs_Automatic, ZipVfs_V2, ZipVfs_V3));
          }
      }
#endif

      fileName = FindKey(opts, "Data Source", DefaultDataSource);

      if (String.IsNullOrEmpty(fileName))
      {
        fileName = FindKey(opts, "Uri", DefaultUri);
        if (String.IsNullOrEmpty(fileName))
        {
          fileName = FindKey(opts, "FullUri", DefaultFullUri);
          if (String.IsNullOrEmpty(fileName))
            throw new ArgumentException(UnsafeNativeMethods.StringFormat(CultureInfo.CurrentCulture, "Data Source cannot be empty.  Use {0} to open an in-memory database", MemoryFileName));
          else
            fullUri = true;
        }
        else
        {
          fileName = MapUriPath(fileName);
#if !NET_COMPACT_20 && TRACE_WARNING

#if !NET_COMPACT_20 && TRACE_WARNING
      if ((_flags & SQLiteConnectionFlags.TraceWarning) == SQLiteConnectionFlags.TraceWarning)
      {
          if (!uri && !fullUri && !isMemory && !String.IsNullOrEmpty(fileName) &&
              fileName.StartsWith("\\", StringComparison.OrdinalIgnoreCase) &&
              !fileName.StartsWith("\\\\", StringComparison.OrdinalIgnoreCase))
          {
              System.Diagnostics.Trace.WriteLine(UnsafeNativeMethods.StringFormat(
                  CultureInfo.CurrentCulture,
                  "WARNING: Detected a possibly malformed UNC database file name \"{0}\" that " +
                  "may have originally started with two backslashes; however, four leading " +
                  "backslashes may be required, e.g.: \"Data Source=\\\\\\{0};\"",
                  fileName));
          }
      }

        if (hexPassword != null)
        {
            string error = null;
            byte[] hexPasswordBytes = FromHexString(hexPassword, ref error);

            if (hexPasswordBytes == null)
            {
                throw new FormatException(UnsafeNativeMethods.StringFormat(
                    CultureInfo.CurrentCulture,
                    "Cannot parse 'HexPassword' property value into byte values: {0}",
                    error));
            }

            _sql.SetPassword(hexPasswordBytes);
        }

          if (boolValue)
          {
              using (SQLiteCommand cmd = CreateCommand())
              {
                  if (_busyTimeout != DefaultBusyTimeout)
                  {
                      cmd.CommandText = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA busy_timeout={0}", _busyTimeout);
                      cmd.ExecuteNonQuery();
                  }

                  int intValue;

                  if (!fullUri && !isMemory)
                  {
                      strValue = FindKey(opts, "Page Size", DefaultPageSize.ToString());
                      intValue = Convert.ToInt32(strValue, CultureInfo.InvariantCulture);
                      if (intValue != DefaultPageSize)
                      {
                          cmd.CommandText = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA page_size={0}", intValue);
                          cmd.ExecuteNonQuery();
                      }
                  }

                  strValue = FindKey(opts, "Max Page Count", DefaultMaxPageCount.ToString());
                  intValue = Convert.ToInt32(strValue, CultureInfo.InvariantCulture);
                  if (intValue != DefaultMaxPageCount)
                  {
                      cmd.CommandText = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA max_page_count={0}", intValue);
                      cmd.ExecuteNonQuery();
                  }

                  strValue = FindKey(opts, "Legacy Format", DefaultLegacyFormat.ToString());
                  boolValue = SQLiteConvert.ToBoolean(strValue);
                  if (boolValue != DefaultLegacyFormat)
                  {
                      cmd.CommandText = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA legacy_file_format={0}", boolValue ? "ON" : "OFF");
                      cmd.ExecuteNonQuery();
                  }

                  strValue = FindKey(opts, "Synchronous", DefaultSynchronous.ToString());
                  enumValue = TryParseEnum(typeof(SQLiteSynchronousEnum), strValue, true);
                  if (!(enumValue is SQLiteSynchronousEnum) || ((SQLiteSynchronousEnum)enumValue != DefaultSynchronous))
                  {
                      cmd.CommandText = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA synchronous={0}", strValue);
                      cmd.ExecuteNonQuery();
                  }

                  strValue = FindKey(opts, "Cache Size", DefaultCacheSize.ToString());
                  intValue = Convert.ToInt32(strValue, CultureInfo.InvariantCulture);
                  if (intValue != DefaultCacheSize)
                  {
                      cmd.CommandText = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA cache_size={0}", intValue);
                      cmd.ExecuteNonQuery();
                  }

                  strValue = FindKey(opts, "Journal Mode", DefaultJournalMode.ToString());
                  enumValue = TryParseEnum(typeof(SQLiteJournalModeEnum), strValue, true);
                  if (!(enumValue is SQLiteJournalModeEnum) || ((SQLiteJournalModeEnum)enumValue != DefaultJournalMode))
                  {
                      string pragmaStr = "PRAGMA journal_mode={0}";

#if INTEROP_INCLUDE_ZIPVFS
                      if (useZipVfs)
                          pragmaStr = "PRAGMA zipvfs_journal_mode={0}";
#endif

                      cmd.CommandText = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, pragmaStr, strValue);
                      cmd.ExecuteNonQuery();
                  }

                  strValue = FindKey(opts, "Foreign Keys", DefaultForeignKeys.ToString());
                  boolValue = SQLiteConvert.ToBoolean(strValue);
                  if (boolValue != DefaultForeignKeys)
                  {
                      cmd.CommandText = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA foreign_keys={0}", boolValue ? "ON" : "OFF");
                      cmd.ExecuteNonQuery();
                  }

                  strValue = FindKey(opts, "Recursive Triggers", DefaultRecursiveTriggers.ToString());
                  boolValue = SQLiteConvert.ToBoolean(strValue);
                  if (boolValue != DefaultRecursiveTriggers)
                  {
                      cmd.CommandText = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA recursive_triggers={0}", boolValue ? "ON" : "OFF");
                      cmd.ExecuteNonQuery();
                  }
              }
          }

          if (_progressHandler != null)
              _sql.SetProgressHook(_progressOps, _progressCallback);

            {
                if (sourceId == null)
                    sourceId = "0000000000000000000000000000000000000000";

                if (sourceTimeStamp == null)
                    sourceTimeStamp = "0000-00-00 00:00:00 UTC";

                return UnsafeNativeMethods.StringFormat(
                    CultureInfo.InvariantCulture,
                    "{0} {1}", sourceId, sourceTimeStamp);
            }
            else
            {
                return null;
            }
        }
    }

            throw new InvalidOperationException("Database connection not valid for shutdown.");

        _sql.Close(true); /* NOTE: MUST be closed before shutdown. */
        SQLiteErrorCode rc = _sql.Shutdown();

#if !NET_COMPACT_20 && TRACE_CONNECTION
        if (rc != SQLiteErrorCode.Ok)
            System.Diagnostics.Trace.WriteLine(UnsafeNativeMethods.StringFormat(
                CultureInfo.CurrentCulture,
                "Shutdown (Instance) Failed: {0}", rc));
#endif

        return rc;
    }

        )
    {
        SQLiteErrorCode rc = SQLite3.StaticShutdown(directories);

        if (rc != SQLiteErrorCode.Ok)
        {
#if !NET_COMPACT_20 && TRACE_CONNECTION
            System.Diagnostics.Trace.WriteLine(UnsafeNativeMethods.StringFormat(
                CultureInfo.CurrentCulture,
                "Shutdown (Static) Failed: {0}", rc));
#endif

            if (!noThrow)
                throw new SQLiteException(rc, null);
        }

      tbl.BeginLoadData();

      if (String.IsNullOrEmpty(strCatalog)) strCatalog = "main";

      string master = (String.Compare(strCatalog, "temp", StringComparison.OrdinalIgnoreCase) == 0) ? _tempmasterdb : _masterdb;

      using (SQLiteCommand cmdTables = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[{1}] WHERE [type] LIKE 'table' OR [type] LIKE 'view'", strCatalog, master), this))
      using (SQLiteDataReader rdTables = cmdTables.ExecuteReader())
      {
        while (rdTables.Read())
        {
          if (String.IsNullOrEmpty(strTable) || String.Compare(strTable, rdTables.GetString(2), StringComparison.OrdinalIgnoreCase) == 0)
          {
            try
            {
              using (SQLiteCommand cmd = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[{1}]", strCatalog, rdTables.GetString(2)), this))
              using (SQLiteDataReader rd = (SQLiteDataReader)cmd.ExecuteReader(CommandBehavior.SchemaOnly))
              using (DataTable tblSchema = rd.GetSchemaTable(true, true))
              {
                foreach (DataRow schemaRow in tblSchema.Rows)
                {
                  if (String.Compare(schemaRow[SchemaTableColumn.ColumnName].ToString(), strColumn, StringComparison.OrdinalIgnoreCase) == 0
                    || strColumn == null)

      tbl.BeginLoadData();

      if (String.IsNullOrEmpty(strCatalog)) strCatalog = "main";

      string master = (String.Compare(strCatalog, "temp", StringComparison.OrdinalIgnoreCase) == 0) ? _tempmasterdb : _masterdb;

      using (SQLiteCommand cmdTables = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[{1}] WHERE [type] LIKE 'table'", strCatalog, master), this))
      using (SQLiteDataReader rdTables = cmdTables.ExecuteReader())
      {
        while (rdTables.Read())
        {
          maybeRowId = false;
          primaryKeys.Clear();
          if (String.IsNullOrEmpty(strTable) || String.Compare(rdTables.GetString(2), strTable, StringComparison.OrdinalIgnoreCase) == 0)
          {
            // First, look for any rowid indexes -- which sqlite defines are INTEGER PRIMARY KEY columns.
            // Such indexes are not listed in the indexes list but count as indexes just the same.
            try
            {
              using (SQLiteCommand cmdTable = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA [{0}].table_info([{1}])", strCatalog, rdTables.GetString(2)), this))
              using (SQLiteDataReader rdTable = cmdTable.ExecuteReader())
              {
                while (rdTable.Read())
                {
                  if (rdTable.GetInt32(5) != 0)
                  {
                    primaryKeys.Add(rdTable.GetInt32(0));

            {
              row = tbl.NewRow();

              row["TABLE_CATALOG"] = strCatalog;
              row["TABLE_NAME"] = rdTables.GetString(2);
              row["INDEX_CATALOG"] = strCatalog;
              row["PRIMARY_KEY"] = true;
              row["INDEX_NAME"] = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "{1}_PK_{0}", rdTables.GetString(2), master);
              row["UNIQUE"] = true;

              if (String.Compare((string)row["INDEX_NAME"], strIndex, StringComparison.OrdinalIgnoreCase) == 0
              || strIndex == null)
              {
                tbl.Rows.Add(row);
              }

              primaryKeys.Clear();
            }

            // Now fetch all the rest of the indexes.
            try
            {
              using (SQLiteCommand cmd = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA [{0}].index_list([{1}])", strCatalog, rdTables.GetString(2)), this))
              using (SQLiteDataReader rd = (SQLiteDataReader)cmd.ExecuteReader())
              {
                while (rd.Read())
                {
                  if (String.Compare(rd.GetString(1), strIndex, StringComparison.OrdinalIgnoreCase) == 0
                  || strIndex == null)
                  {
                    row = tbl.NewRow();

                    row["TABLE_CATALOG"] = strCatalog;
                    row["TABLE_NAME"] = rdTables.GetString(2);
                    row["INDEX_CATALOG"] = strCatalog;
                    row["INDEX_NAME"] = rd.GetString(1);
                    row["UNIQUE"] = SQLiteConvert.ToBoolean(rd.GetValue(2), CultureInfo.InvariantCulture, false);
                    row["PRIMARY_KEY"] = false;

                    // get the index definition
                    using (SQLiteCommand cmdIndexes = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[{2}] WHERE [type] LIKE 'index' AND [name] LIKE '{1}'", strCatalog, rd.GetString(1).Replace("'", "''"), master), this))
                    using (SQLiteDataReader rdIndexes = cmdIndexes.ExecuteReader())
                    {
                      while (rdIndexes.Read())
                      {
                        if (rdIndexes.IsDBNull(4) == false)
                          row["INDEX_DEFINITION"] = rdIndexes.GetString(4);
                        break;
                      }
                    }

                    // Now for the really hard work.  Figure out which index is the primary key index.
                    // The only way to figure it out is to check if the index was an autoindex and if we have a non-rowid
                    // primary key, and all the columns in the given index match the primary key columns
                    if (primaryKeys.Count > 0 && rd.GetString(1).StartsWith("sqlite_autoindex_" + rdTables.GetString(2), StringComparison.InvariantCultureIgnoreCase) == true)
                    {
                      using (SQLiteCommand cmdDetails = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA [{0}].index_info([{1}])", strCatalog, rd.GetString(1)), this))
                      using (SQLiteDataReader rdDetails = cmdDetails.ExecuteReader())
                      {
                        int nMatches = 0;
                        while (rdDetails.Read())
                        {
                          if (primaryKeys.Contains(rdDetails.GetInt32(1)) == false)
                          {

      tbl.BeginLoadData();

      if (String.IsNullOrEmpty(table)) table = null;
      if (String.IsNullOrEmpty(catalog)) catalog = "main";
      string master = (String.Compare(catalog, "temp", StringComparison.OrdinalIgnoreCase) == 0) ? _tempmasterdb : _masterdb;

      using (SQLiteCommand cmd = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "SELECT [type], [name], [tbl_name], [rootpage], [sql], [rowid] FROM [{0}].[{1}] WHERE [type] LIKE 'trigger'", catalog, master), this))
      using (SQLiteDataReader rd = (SQLiteDataReader)cmd.ExecuteReader())
      {
        while (rd.Read())
        {
          if (String.Compare(rd.GetString(1), triggerName, StringComparison.OrdinalIgnoreCase) == 0
            || triggerName == null)
          {

      tbl.Columns.Add("TABLE_DEFINITION", typeof(string));
      tbl.BeginLoadData();

      if (String.IsNullOrEmpty(strCatalog)) strCatalog = "main";

      string master = (String.Compare(strCatalog, "temp", StringComparison.OrdinalIgnoreCase) == 0) ? _tempmasterdb : _masterdb;

      using (SQLiteCommand cmd = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "SELECT [type], [name], [tbl_name], [rootpage], [sql], [rowid] FROM [{0}].[{1}] WHERE [type] LIKE 'table'", strCatalog, master), this))
      using (SQLiteDataReader rd = (SQLiteDataReader)cmd.ExecuteReader())
      {
        while (rd.Read())
        {
          strItem = rd.GetString(0);
          if (String.Compare(rd.GetString(2), 0, "SQLITE_", 0, 7, StringComparison.OrdinalIgnoreCase) == 0)
            strItem = "SYSTEM_TABLE";

      tbl.BeginLoadData();

      if (String.IsNullOrEmpty(strCatalog)) strCatalog = "main";

      string master = (String.Compare(strCatalog, "temp", StringComparison.OrdinalIgnoreCase) == 0) ? _tempmasterdb : _masterdb;

      using (SQLiteCommand cmd = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[{1}] WHERE [type] LIKE 'view'", strCatalog, master), this))
      using (SQLiteDataReader rd = (SQLiteDataReader)cmd.ExecuteReader())
      {
        while (rd.Read())
        {
          if (String.Compare(rd.GetString(1), strView, StringComparison.OrdinalIgnoreCase) == 0
            || String.IsNullOrEmpty(strView))
          {

      if (String.IsNullOrEmpty(strCatalog)) strCatalog = "main";

      string master = (String.Compare(strCatalog, "temp", StringComparison.OrdinalIgnoreCase) == 0) ? _tempmasterdb : _masterdb;

      tbl.BeginLoadData();

      using (SQLiteCommand cmdTables = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[{1}] WHERE [type] LIKE 'table'", strCatalog, master), this))
      using (SQLiteDataReader rdTables = cmdTables.ExecuteReader())
      {
        while (rdTables.Read())
        {
          maybeRowId = false;
          primaryKeys.Clear();
          if (String.IsNullOrEmpty(strTable) || String.Compare(rdTables.GetString(2), strTable, StringComparison.OrdinalIgnoreCase) == 0)
          {
            try
            {
              using (SQLiteCommand cmdTable = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA [{0}].table_info([{1}])", strCatalog, rdTables.GetString(2)), this))
              using (SQLiteDataReader rdTable = cmdTable.ExecuteReader())
              {
                while (rdTable.Read())
                {
                  if (rdTable.GetInt32(5) == 1) // is a primary key
                  {
                    primaryKeys.Add(new KeyValuePair<int, string>(rdTable.GetInt32(0), rdTable.GetString(1)));

            {
            }
            // This is a rowid row
            if (primaryKeys.Count == 1 && maybeRowId == true)
            {
              row = tbl.NewRow();
              row["CONSTRAINT_CATALOG"] = strCatalog;
              row["CONSTRAINT_NAME"] = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "{1}_PK_{0}", rdTables.GetString(2), master);
              row["TABLE_CATALOG"] = strCatalog;
              row["TABLE_NAME"] = rdTables.GetString(2);
              row["COLUMN_NAME"] = primaryKeys[0].Value;
              row["INDEX_NAME"] = row["CONSTRAINT_NAME"];
              row["ORDINAL_POSITION"] = 0; // primaryKeys[0].Key;
              row["COLLATION_NAME"] = "BINARY";
              row["SORT_MODE"] = "ASC";
              row["CONFLICT_OPTION"] = 2;

              if (String.IsNullOrEmpty(strIndex) || String.Compare(strIndex, (string)row["INDEX_NAME"], StringComparison.OrdinalIgnoreCase) == 0)
                tbl.Rows.Add(row);
            }

            using (SQLiteCommand cmdIndexes = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[{2}] WHERE [type] LIKE 'index' AND [tbl_name] LIKE '{1}'", strCatalog, rdTables.GetString(2).Replace("'", "''"), master), this))
            using (SQLiteDataReader rdIndexes = cmdIndexes.ExecuteReader())
            {
              while (rdIndexes.Read())
              {
                int ordinal = 0;
                if (String.IsNullOrEmpty(strIndex) || String.Compare(strIndex, rdIndexes.GetString(1), StringComparison.OrdinalIgnoreCase) == 0)
                {
                  try
                  {
                    using (SQLiteCommand cmdIndex = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA [{0}].index_info([{1}])", strCatalog, rdIndexes.GetString(1)), this))
                    using (SQLiteDataReader rdIndex = cmdIndex.ExecuteReader())
                    {
                      while (rdIndex.Read())
                      {
                        row = tbl.NewRow();
                        row["CONSTRAINT_CATALOG"] = strCatalog;
                        row["CONSTRAINT_NAME"] = rdIndexes.GetString(1);

      if (String.IsNullOrEmpty(strCatalog)) strCatalog = "main";

      string master = (String.Compare(strCatalog, "temp", StringComparison.OrdinalIgnoreCase) == 0) ? _tempmasterdb : _masterdb;

      tbl.BeginLoadData();

      using (SQLiteCommand cmdViews = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[{1}] WHERE [type] LIKE 'view'", strCatalog, master), this))
      using (SQLiteDataReader rdViews = cmdViews.ExecuteReader())
      {
        while (rdViews.Read())
        {
          if (String.IsNullOrEmpty(strView) || String.Compare(strView, rdViews.GetString(2), StringComparison.OrdinalIgnoreCase) == 0)
          {
            using (SQLiteCommand cmdViewSelect = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[{1}]", strCatalog, rdViews.GetString(2)), this))
            {
              strSql = rdViews.GetString(4).Replace('\r', ' ').Replace('\n', ' ').Replace('\t', ' ');
              n = CultureInfo.InvariantCulture.CompareInfo.IndexOf(strSql, " AS ", CompareOptions.IgnoreCase);
              if (n < 0)
                continue;

              strSql = strSql.Substring(n + 4);

      if (String.IsNullOrEmpty(strCatalog)) strCatalog = "main";

      string master = (String.Compare(strCatalog, "temp", StringComparison.OrdinalIgnoreCase) == 0) ? _tempmasterdb : _masterdb;

      tbl.BeginLoadData();

      using (SQLiteCommand cmdTables = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[{1}] WHERE [type] LIKE 'table'", strCatalog, master), this))
      using (SQLiteDataReader rdTables = cmdTables.ExecuteReader())
      {
        while (rdTables.Read())
        {
          if (String.IsNullOrEmpty(strTable) || String.Compare(strTable, rdTables.GetString(2), StringComparison.OrdinalIgnoreCase) == 0)
          {
            try
            {
              using (SQLiteCommandBuilder builder = new SQLiteCommandBuilder())
              using (SQLiteCommand cmdKey = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA [{0}].foreign_key_list([{1}])", strCatalog, rdTables.GetString(2)), this))
              using (SQLiteDataReader rdKey = cmdKey.ExecuteReader())
              {
                while (rdKey.Read())
                {
                  row = tbl.NewRow();
                  row["CONSTRAINT_CATALOG"] = strCatalog;
                  row["CONSTRAINT_NAME"] = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "FK_{0}_{1}_{2}", rdTables[2], rdKey.GetInt32(0), rdKey.GetInt32(1));
                  row["TABLE_CATALOG"] = strCatalog;
                  row["TABLE_NAME"] = builder.UnquoteIdentifier(rdTables.GetString(2));
                  row["CONSTRAINT_TYPE"] = "FOREIGN KEY";
                  row["IS_DEFERRABLE"] = false;
                  row["INITIALLY_DEFERRED"] = false;
                  row["FKEY_ID"] = rdKey[0];
                  row["FKEY_FROM_COLUMN"] = builder.UnquoteIdentifier(rdKey[3].ToString());

        {
            try
            {
                if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
                        SQLiteConnectionFlags.LogCallbackException)
                {
                    SQLiteLog.LogMessage(SQLiteBase.COR_E_EXCEPTION,
                        UnsafeNativeMethods.StringFormat(CultureInfo.CurrentCulture,
                        "Caught exception in \"Progress\" method: {1}",
                        e)); /* throw */
                }
            }
            catch
            {
                // do nothing.

        {
            try
            {
                if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
                        SQLiteConnectionFlags.LogCallbackException)
                {
                    SQLiteLog.LogMessage(SQLiteBase.COR_E_EXCEPTION,
                        UnsafeNativeMethods.StringFormat(CultureInfo.CurrentCulture,
                        "Caught exception in \"Authorize\" method: {1}",
                        e)); /* throw */
                }
            }
            catch
            {
                // do nothing.

        {
            try
            {
                if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
                        SQLiteConnectionFlags.LogCallbackException)
                {
                    SQLiteLog.LogMessage(SQLiteBase.COR_E_EXCEPTION,
                        UnsafeNativeMethods.StringFormat(CultureInfo.CurrentCulture,
                        "Caught exception in \"Update\" method: {1}",
                        e)); /* throw */
                }
            }
            catch
            {
                // do nothing.

        {
            try
            {
                if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
                        SQLiteConnectionFlags.LogCallbackException)
                {
                    SQLiteLog.LogMessage(SQLiteBase.COR_E_EXCEPTION,
                        UnsafeNativeMethods.StringFormat(CultureInfo.CurrentCulture,
                        "Caught exception in \"Trace\" method: {1}",
                        e)); /* throw */
                }
            }
            catch
            {
                // do nothing.

        {
            try
            {
                if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
                        SQLiteConnectionFlags.LogCallbackException)
                {
                    SQLiteLog.LogMessage(SQLiteBase.COR_E_EXCEPTION,
                        UnsafeNativeMethods.StringFormat(CultureInfo.CurrentCulture,
                        "Caught exception in \"Commit\" method: {1}",
                        e)); /* throw */
                }
            }
            catch
            {
                // do nothing.

        {
            try
            {
                if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
                        SQLiteConnectionFlags.LogCallbackException)
                {
                    SQLiteLog.LogMessage(SQLiteBase.COR_E_EXCEPTION,
                        UnsafeNativeMethods.StringFormat(CultureInfo.CurrentCulture,
                        "Caught exception in \"Rollback\" method: {1}",
                        e)); /* throw */
                }
            }
            catch
            {
                // do nothing.

            case TypeCode.Decimal:
                return ((decimal)obj) != Decimal.Zero ? true : false;
            case TypeCode.String:
                return viaFramework ?
                    Convert.ToBoolean(obj, provider) :
                    ToBoolean(ToStringWithProvider(obj, provider));
            default:
                throw new SQLiteException(UnsafeNativeMethods.StringFormat(
                    CultureInfo.CurrentCulture,
                    "Cannot convert type {0} to boolean",
                    typeCode));
        }
    }

    /// <summary>

        DbType dbType,
        SQLiteConnectionFlags flags,
        string typeName
        )
    {
        if ((flags & SQLiteConnectionFlags.TraceWarning) == SQLiteConnectionFlags.TraceWarning)
        {
            Trace.WriteLine(UnsafeNativeMethods.StringFormat(
                CultureInfo.CurrentCulture,
                "WARNING: Type mapping failed, returning default name \"{0}\" for type {1}.",
                typeName, dbType));
        }
    }

    /// <summary>

        SQLiteConnectionFlags flags,
        DbType? dbType
        )
    {
        if (!String.IsNullOrEmpty(typeName) &&
            ((flags & SQLiteConnectionFlags.TraceWarning) == SQLiteConnectionFlags.TraceWarning))
        {
            Trace.WriteLine(UnsafeNativeMethods.StringFormat(
                CultureInfo.CurrentCulture,
                "WARNING: Type mapping failed, returning default type {0} for name \"{1}\".",
                dbType, typeName));
        }
    }
#endif

              }
            }
          }

          if (wantDefaultValue)
          {
            // Determine the default value for the column, which sucks because we have to query the schema for each column
            using (SQLiteCommand cmdTable = new SQLiteCommand(UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA [{0}].TABLE_INFO([{1}])",
              row[SchemaTableOptionalColumn.BaseCatalogName],
              row[SchemaTableColumn.BaseTableName]
              ), _command.Connection))
            using (DbDataReader rdTable = cmdTable.ExecuteReader())
            {
              // Find the matching column
              while (rdTable.Read())

        // NOTE: When in "strict" mode, throw an exception if the isolation
        //       level is not recognized; otherwise, fallback to the default
        //       isolation level specified by the caller.
        //
        if (throwOnUnsupported)
        {
            throw new InvalidOperationException(
                UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture,
                "unsupported isolation level {0}", isolationLevel));
        }

        return defaultIsolationLevel;
    }

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

/********************************************************
 * ADO.NET 2.0 Data Provider for SQLite Version 3.X
 * Written by Robert Simpson (robert@blackcastlesoft.com)
 *
 * Released to the public domain, use at your own risk!
 ********************************************************/

namespace System.Data.SQLite
{
  using System;
  using System.Data.Common;
  using System.Globalization;

#if !PLATFORM_COMPACTFRAMEWORK
  using System.Reflection;
  using System.Runtime.Serialization;
  using System.Security.Permissions;
#endif

    /// <param name="message">Optional detailed error message.</param>
    /// <returns>Error message text for the return code.</returns>
    private static string GetStockErrorMessage(
        SQLiteErrorCode errorCode,
        string message
        )
    {
        return UnsafeNativeMethods.StringFormat(
            CultureInfo.InvariantCulture,
            "{0}{1}{2}",
            GetErrorString(errorCode),
#if !NET_COMPACT_20
            Environment.NewLine, message).Trim();
#else
            "\r\n", message).Trim();
#endif
    }

        {
            try
            {
                if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
                        SQLiteConnectionFlags.LogCallbackException)
                {
                    SQLiteLog.LogMessage(SQLiteBase.COR_E_EXCEPTION,
                        UnsafeNativeMethods.StringFormat(CultureInfo.CurrentCulture,
                        "Caught exception in \"Invoke\" method: {0}",
                        e)); /* throw */
                }
            }
            catch
            {
                // do nothing.

        {
            try
            {
                if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
                        SQLiteConnectionFlags.LogCallbackException)
                {
                    SQLiteLog.LogMessage(SQLiteBase.COR_E_EXCEPTION,
                        UnsafeNativeMethods.StringFormat(CultureInfo.CurrentCulture,
                        "Caught exception in \"Compare\" (UTF8) method: {0}",
                        e)); /* throw */
                }
            }
            catch
            {
                // do nothing.

        {
            try
            {
                if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
                        SQLiteConnectionFlags.LogCallbackException)
                {
                    SQLiteLog.LogMessage(SQLiteBase.COR_E_EXCEPTION,
                        UnsafeNativeMethods.StringFormat(CultureInfo.CurrentCulture,
                        "Caught exception in \"Compare\" (UTF16) method: {0}",
                        e)); /* throw */
                }
            }
            catch
            {
                // do nothing.

        {
            try
            {
                if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
                        SQLiteConnectionFlags.LogCallbackException)
                {
                    SQLiteLog.LogMessage(SQLiteBase.COR_E_EXCEPTION,
                        UnsafeNativeMethods.StringFormat(CultureInfo.CurrentCulture,
                        "Caught exception in \"Step\" method: {1}",
                        e)); /* throw */
                }
            }
            catch
            {
                // do nothing.

        {
            try
            {
                if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
                        SQLiteConnectionFlags.LogCallbackException)
                {
                    SQLiteLog.LogMessage(SQLiteBase.COR_E_EXCEPTION,
                        UnsafeNativeMethods.StringFormat(CultureInfo.CurrentCulture,
                        "Caught exception in \"Final\" method: {1}",
                        e)); /* throw */
                }
            }
            catch
            {
                // do nothing.

            {
                _command = cnn.CreateCommand();
                for (int n = 0; n < columns.Length; n++)
                {
                    columns[n] = builder.QuoteIdentifier(columns[n]);
                }
            }
            _command.CommandText = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, "SELECT {0} FROM [{1}].[{2}] WHERE ROWID = ?", String.Join(",", columns), database, table);
            _command.Parameters.AddWithValue(null, (long)0);
        }

        internal bool IsValid
        {
            set
            {

            {
                type = "trace";
            }

            if ((errorCode != null) &&
                !Object.ReferenceEquals(errorCode, String.Empty))
            {
                Trace.WriteLine(UnsafeNativeMethods.StringFormat(
                    CultureInfo.CurrentCulture, "SQLite {0} ({1}): {2}",
                    type, errorCode, message));
            }
            else
            {
                Trace.WriteLine(UnsafeNativeMethods.StringFormat(
                    CultureInfo.CurrentCulture, "SQLite {0}: {1}",
                    type, message));
            }
#endif
        }
    }
}

                //
                try
                {
                    if (LogExceptionsNoThrow)
                    {
                        /* throw */
                        SQLiteLog.LogMessage(SQLiteBase.COR_E_EXCEPTION,
                            UnsafeNativeMethods.StringFormat(
                            CultureInfo.CurrentCulture,
                            "Caught exception in \"{0}\" method: {1}",
                            destroy ? "xDestroy" : "xDisconnect", e));
                    }
                }
                catch
                {
                    // do nothing.

            )
        {
            try
            {
                if (logErrors)
                {
                    SQLiteLog.LogMessage(SQLiteErrorCode.Error,
                        UnsafeNativeMethods.StringFormat(
                        CultureInfo.CurrentCulture,
                        "Virtual table error: {0}", error)); /* throw */
                }
            }
            catch
            {
                // do nothing.
            }

            catch (Exception e) /* NOTE: Must catch ALL. */
            {
                try
                {
                    if (logExceptions)
                    {
                        SQLiteLog.LogMessage(SQLiteBase.COR_E_EXCEPTION,
                            UnsafeNativeMethods.StringFormat(
                            CultureInfo.CurrentCulture,
                            "Caught exception in \"SetTableError\" method: {0}",
                            e)); /* throw */
                    }
                }
                catch
                {
                    // do nothing.

            if ((tables != null) &&
                tables.TryGetValue(pVtab, out table))
            {
                return table;
            }

            SetTableError(pVtab, UnsafeNativeMethods.StringFormat(
                CultureInfo.CurrentCulture,
                "managed table for {0} not found", pVtab));

            return null;
        }

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

            if ((cursors != null) &&
                cursors.TryGetValue(pCursor, out cursor))
            {
                return cursor;
            }

            SetTableError(pVtab, UnsafeNativeMethods.StringFormat(
                CultureInfo.CurrentCulture,
                "managed cursor for {0} not found", pCursor));

            return null;
        }

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

        /// </returns>
        protected virtual string GetFunctionKey(
            int argumentCount,
            string name,
            SQLiteFunction function
            )
        {
            return UnsafeNativeMethods.StringFormat(
                CultureInfo.CurrentCulture,
                "{0}:{1}", argumentCount, name);
        }
        #endregion

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

        #region Table Declaration Helper Methods
        /// <summary>

                catch (Exception e)
                {
                    try
                    {
                        if (LogExceptionsNoThrow)
                        {
                            SQLiteLog.LogMessage(SQLiteBase.COR_E_EXCEPTION,
                                UnsafeNativeMethods.StringFormat(
                                CultureInfo.CurrentCulture,
                                "Caught exception in \"Dispose\" method: {0}",
                                e)); /* throw */
                        }
                    }
                    catch
                    {
                        // do nothing.

    public class SQLiteModuleCommon : 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 =
            UnsafeNativeMethods.StringFormat(
                CultureInfo.CurrentCulture, "CREATE TABLE {0}(x);",
                typeof(SQLiteModuleCommon).Name);
        #endregion

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

        #region Private Data
        /// <summary>
        /// Non-zero if different object instances with the same value should

        protected virtual SQLiteErrorCode CursorTypeMismatchError(
            SQLiteVirtualTableCursor cursor,
            Type type
            )
        {
            if (type != null)
            {
                SetCursorError(cursor, UnsafeNativeMethods.StringFormat(
                    CultureInfo.CurrentCulture, "not a \"{0}\" cursor",
                    type));
            }
            else
            {
                SetCursorError(cursor, "cursor type mismatch");
            }

            return SQLiteErrorCode.Error;

            SQLiteIndex index
            )
        {
            CheckDisposed();

            if (!table.BestIndex(index))
            {
                SetTableError(table, UnsafeNativeMethods.StringFormat(
                    CultureInfo.CurrentCulture,
                    "failed to select best index for virtual table \"{0}\"",
                    table.TableName));

                return SQLiteErrorCode.Error;
            }

            return SQLiteErrorCode.Ok;

            SQLiteVirtualTable table,
            SQLiteValue[] values,
            ref long rowId
            )
        {
            CheckDisposed();

            SetTableError(table, UnsafeNativeMethods.StringFormat(
                CultureInfo.CurrentCulture,
                "virtual table \"{0}\" is read-only", table.TableName));

            return SQLiteErrorCode.Error;
        }

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

            string newName
            )
        {
            CheckDisposed();

            if (!table.Rename(newName))
            {
                SetTableError(table, UnsafeNativeMethods.StringFormat(
                    CultureInfo.CurrentCulture,
                    "failed to rename virtual table from \"{0}\" to \"{1}\"",
                    table.TableName, newName));

                return SQLiteErrorCode.Error;
            }

            return SQLiteErrorCode.Ok;

      foreach(SQLiteParameter p in _parameterList)
      {
        y ++;
        s = p.ParameterName;
        if (s == null)
        {
          s = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, ";{0}", nUnnamed);
          nUnnamed++;
        }

        int x;
        bool isMapped = false;

        if (activeStatement == null)

          stmt = null;
        }

        // If the parameter has a name, but the SQL statement uses unnamed references, this can happen -- attempt to map
        // the parameter by its index in the collection
        if (isMapped == false)
        {
          s = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, ";{0}", y);

          stmt = activeStatement;
          for (n = 0; n < x; n++)
          {
            if (stmt == null) stmt = _command._statementList[n];
            if (stmt._paramNames != null)
            {

/********************************************************
 * ADO.NET 2.0 Data Provider for SQLite Version 3.X
 * Written by Robert Simpson (robert@blackcastlesoft.com)
 *
 * Released to the public domain, use at your own risk!
 ********************************************************/

namespace System.Data.SQLite
{
  using System;
  using System.Globalization;

        _paramValues = new SQLiteParameter[n];

        for (x = 0; x < n; x++)
        {
          s = _sql.Bind_ParamName(this, _flags, x + 1);
          if (String.IsNullOrEmpty(s))
          {
            s = UnsafeNativeMethods.StringFormat(CultureInfo.InvariantCulture, ";{0}", nCmdStart);
            nCmdStart++;
            _unnamedParameters++;
          }
          _paramNames[x] = s;
          _paramValues[x] = null;
        }
      }

    /// this statement, and if so, keeps a reference to the parameter so it can be bound later.
    /// </summary>
    /// <param name="s">The parameter name to map</param>
    /// <param name="p">The parameter to assign it</param>
    internal bool MapParameter(string s, SQLiteParameter p)
    {
      if (_paramNames == null) return false;

      int startAt = 0;
      if (s.Length > 0)
      {
        if (":$@;".IndexOf(s[0]) == -1)
          startAt = 1;
      }

      if ((obj != null) && (objType == DbType.Object))
          objType = SQLiteConvert.TypeToDbType(obj.GetType());

      if ((_flags & SQLiteConnectionFlags.LogPreBind) == SQLiteConnectionFlags.LogPreBind)
      {
          IntPtr handle = _sqlite_stmt;

          SQLiteLog.LogMessage(UnsafeNativeMethods.StringFormat(
              CultureInfo.CurrentCulture,
              "Binding statement {0} paramter #{1} with database type {2} and raw value {{{3}}}...",
              handle, index, objType, obj));
      }

      if ((obj == null) || Convert.IsDBNull(obj))
      {
          _sql.Bind_Null(this, _flags, index);

      /// <summary>
      /// For now, this method simply calls the Initialize method.
      /// </summary>
      static UnsafeNativeMethods()
      {
          Initialize();
      }

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

      /// <summary>
      /// This type is only present when running on Mono.
      /// </summary>
      private static readonly string MonoRuntimeType = "Mono.Runtime";

      /// <summary>
      /// Keeps track of whether we are running on Mono.  Initially null, it is
      /// set by the <see cref="IsMono" /> method on its first call.  Later, it
      /// is returned verbatim.
      /// </summary>
      private static bool? isMono = null;

      /// <summary>
      /// Determines whether or not this assembly is running on Mono.
      /// </summary>
      /// <returns>
      /// Non-zero if this assembly is running on Mono.
      /// </returns>
      private static bool IsMono()
      {
          try
          {
              lock (staticSyncRoot)
              {
                  if (isMono == null)
                      isMono = (Type.GetType(MonoRuntimeType) != null);

                  return (bool)isMono;
              }
          }
          catch
          {
              // do nothing.
          }

          return false;
      }

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

      /// <summary>
      /// This is a wrapper around the
      /// <see cref="String.Format(IFormatProvider,String,Object[])" /> method.
      /// On Mono, it has to call the method overload without the
      /// <see cref="IFormatProvider" /> parameter, due to a bug in Mono.
      /// </summary>
      /// <param name="provider">
      /// This is used for culture-specific formatting.
      /// </param>
      /// <param name="format">
      /// The format string.
      /// </param>
      /// <param name="args">
      /// An array the objects to format.
      /// </param>
      /// <returns>
      /// The resulting string.
      /// </returns>
      internal static string StringFormat(
          IFormatProvider provider,
          string format,
          params object[] args
          )
      {
          if (IsMono())
              return String.Format(format, args);
          else
              return String.Format(provider, format, args);
      }

      /////////////////////////////////////////////////////////////////////////
      /// <summary>
      /// Attempts to initialize this class by pre-loading the native SQLite
      /// library for the processor architecture of the current process.
      /// </summary>
      internal static void Initialize()

#if !PLATFORM_COMPACTFRAMEWORK
          bool expand = true;

          if (Environment.GetEnvironmentVariable("No_Expand") != null)
          {
              expand = false;
          }
          else if (Environment.GetEnvironmentVariable(StringFormat(
                  CultureInfo.InvariantCulture, "No_Expand_{0}",
                  name)) != null)
          {
              expand = false;
          }

          value = Environment.GetEnvironmentVariable(name);

          if (expand && !String.IsNullOrEmpty(value))

              if (fileName == null)
                  return @default;

              XmlDocument document = new XmlDocument();

              document.Load(fileName);

              XmlElement element = document.SelectSingleNode(StringFormat(
                  CultureInfo.InvariantCulture,
                  "/configuration/appSettings/add[@key='{0}']", name)) as
                  XmlElement;

              if (element != null)
              {
                  if (element.HasAttribute("value"))
                      value = element.GetAttribute("value");

#else
          catch (Exception)
#endif
          {
#if !NET_COMPACT_20 && TRACE_SHARED
              try
              {
                  Trace.WriteLine(StringFormat(
                      CultureInfo.CurrentCulture,
                      "Native library pre-loader failed to get setting " +
                      "\"{0}\" value: {1}", name, e)); /* throw */
              }
              catch
              {
                  // do nothing.

                  directory, XmlConfigFileName);

              if (File.Exists(xmlConfigFileName))
              {
#if !NET_COMPACT_20 && TRACE_DETECTION
                  try
                  {
                      Trace.WriteLine(StringFormat(
                          CultureInfo.CurrentCulture,
                          "Native library pre-loader found XML configuration file " +
                          "via code base for currently executing assembly: \"{0}\"",
                          xmlConfigFileName)); /* throw */
                  }
                  catch
                  {

              List<string> matches = null;

              if (CheckForArchitecturesAndPlatforms(directory, ref matches) > 0)
              {
#if !NET_COMPACT_20 && TRACE_DETECTION
                  try
                  {
                      Trace.WriteLine(StringFormat(
                          CultureInfo.CurrentCulture,
                          "Native library pre-loader found native sub-directories " +
                          "via code base for currently executing assembly: \"{0}\"",
                          ListToString(matches))); /* throw */
                  }
                  catch
                  {

#else
          catch (Exception)
#endif
          {
#if !NET_COMPACT_20 && TRACE_SHARED
              try
              {
                  Trace.WriteLine(StringFormat(
                      CultureInfo.CurrentCulture,
                      "Native library pre-loader failed to check code base " +
                      "for currently executing assembly: {0}", e)); /* throw */
              }
              catch
              {
                  // do nothing.

#else
          catch (Exception)
#endif
          {
#if !NET_COMPACT_20 && TRACE_SHARED
              try
              {
                  Trace.WriteLine(StringFormat(
                      CultureInfo.CurrentCulture,
                      "Native library pre-loader failed to get directory " +
                      "for currently executing assembly: {0}", e)); /* throw */
              }
              catch
              {
                  // do nothing.

#if !NET_COMPACT_20 && TRACE_DETECTION
              try
              {
                  //
                  // NOTE: Show that we hit a fairly unusual situation (i.e.
                  //       the "wrong" processor architecture was detected).
                  //
                  Trace.WriteLine(StringFormat(
                      CultureInfo.CurrentCulture,
                      "Native library pre-loader detected {0}-bit pointer " +
                      "size with processor architecture \"{1}\", using " +
                      "processor architecture \"{2}\" instead...",
                      IntPtr.Size * 8 /* bits */, savedProcessorArchitecture,
                      processorArchitecture)); /* throw */
              }

#if !NET_COMPACT_20 && TRACE_PRELOAD
              try
              {
                  //
                  // NOTE: Show exactly where we are trying to load the native
                  //       SQLite library from.
                  //
                  Trace.WriteLine(StringFormat(
                      CultureInfo.CurrentCulture,
                      "Native library pre-loader is trying to load native " +
                      "SQLite library \"{0}\"...", fileName)); /* throw */
              }
              catch
              {
                  // do nothing.

                  int lastError = Marshal.GetLastWin32Error(); /* throw */

                  //
                  // NOTE: Show where we failed to load the native SQLite
                  //       library from along with the Win32 error code and
                  //       exception information.
                  //
                  Trace.WriteLine(StringFormat(
                      CultureInfo.CurrentCulture,
                      "Native library pre-loader failed to load native " +
                      "SQLite library \"{0}\" (getLastError = {1}): {2}",
                      fileName, lastError, e)); /* throw */
              }
              catch
              {

                if (localHandle != IntPtr.Zero)
                    SQLiteBase.CloseConnection(this, localHandle);
#endif

#if !NET_COMPACT_20 && TRACE_HANDLE
                try
                {
                    Trace.WriteLine(StringFormat(
                        CultureInfo.CurrentCulture,
                        "CloseConnection: {0}", localHandle)); /* throw */
                }
                catch
                {
                }
#endif

#else
            catch (SQLiteException)
#endif
            {
#if !NET_COMPACT_20 && TRACE_HANDLE
                try
                {
                    Trace.WriteLine(StringFormat(
                        CultureInfo.CurrentCulture,
                        "CloseConnection: {0}, exception: {1}",
                        handle, e)); /* throw */
                }
                catch
                {
                }

                if (localHandle != IntPtr.Zero)
                    SQLiteBase.FinalizeStatement(cnn, localHandle);

#if !NET_COMPACT_20 && TRACE_HANDLE
                try
                {
                    Trace.WriteLine(StringFormat(
                        CultureInfo.CurrentCulture,
                        "FinalizeStatement: {0}", localHandle)); /* throw */
                }
                catch
                {
                }
#endif

#else
            catch (SQLiteException)
#endif
            {
#if !NET_COMPACT_20 && TRACE_HANDLE
                try
                {
                    Trace.WriteLine(StringFormat(
                        CultureInfo.CurrentCulture,
                        "FinalizeStatement: {0}, exception: {1}",
                        handle, e)); /* throw */
                }
                catch
                {
                }

                if (localHandle != IntPtr.Zero)
                    SQLiteBase.FinishBackup(cnn, localHandle);

#if !NET_COMPACT_20 && TRACE_HANDLE
                try
                {
                    Trace.WriteLine(StringFormat(
                        CultureInfo.CurrentCulture,
                        "FinishBackup: {0}", localHandle)); /* throw */
                }
                catch
                {
                }
#endif

#else
            catch (SQLiteException)
#endif
            {
#if !NET_COMPACT_20 && TRACE_HANDLE
                try
                {
                    Trace.WriteLine(StringFormat(
                        CultureInfo.CurrentCulture,
                        "FinishBackup: {0}, exception: {1}",
                        handle, e)); /* throw */
                }
                catch
                {
                }