System.Data.SQLite

/********************************************************
 * 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.Collections.Generic;

    // goes to the pool and is resurrected later, re-registered functions will overwrite the
    // previous functions.  The SQLiteFunctionCookieHandle will take care of freeing unmanaged
    // resources belonging to the previously-registered functions.
    internal override void Close(bool canThrow)
    {
      if (_sql != null)
      {






          if (!_sql.OwnHandle)
          {
              _sql = null;
              return;
          }

          bool unbindFunctions = ((_flags & SQLiteConnectionFlags.UnbindFunctionsOnClose)
                == SQLiteConnectionFlags.UnbindFunctionsOnClose);

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

              _sql.Dispose();
          }
          _sql = null;
      }
    }

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

#if !NET_COMPACT_20 && TRACE_CONNECTION
    protected string HandleToString()
    {
        if (_sql == null)
            return "<null>";

        return _sql.ToString();
    }
#endif

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

    /// <summary>
    /// Returns the number of times the <see cref="Cancel" /> method has been
    /// called.
    /// </summary>

        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(String.Format(
            CultureInfo.CurrentCulture,
            "Open (Pool): {0}", HandleToString()));
#endif
      }

      if (_sql == null)
      {
        try
        {

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

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

          if (n != SQLiteErrorCode.Ok) throw new SQLiteException(n, null);
          _sql = new SQLiteConnectionHandle(db, true);
        }
        lock (_sql) { /* HACK: Force the SyncBlock to be "created" now. */ }

#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(String.Format(
                CultureInfo.CurrentCulture,
                "Prepare ({0}): {1}", n, stmt));
#endif

            if ((n == SQLiteErrorCode.Ok) && (stmt != IntPtr.Zero))
            {
              if (statementHandle != null) statementHandle.Dispose();
              statementHandle = new SQLiteStatementHandle(_sql, stmt);
            }

            _modules.Add(module.Name, module);

            if (_usePool)
            {
                _usePool = false;

#if !NET_COMPACT_20 && TRACE_CONNECTION
                Trace.WriteLine(String.Format(
                    CultureInfo.CurrentCulture,
                    "CreateModule (Pool) Disabled: {0}",
                    HandleToString()));
#endif
            }
        }
        else
        {
            throw new SQLiteException(GetLastError());
        }

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

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

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

  /// <summary>
  /// Alternate SQLite3 object, overriding many text behaviors to support UTF-16 (Unicode)

            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(String.Format(
            CultureInfo.CurrentCulture,
            "Open16 (Pool): {0}",
            HandleToString()));
#endif
      }

      if (_sql == null)
      {
        try
        {

                "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(String.Format(
              CultureInfo.CurrentCulture,
              "Open16: {0}", db));
#endif

          if (n != SQLiteErrorCode.Ok) throw new SQLiteException(n, null);
          _sql = new SQLiteConnectionHandle(db, true);
        }
        lock (_sql) { /* HACK: Force the SyncBlock to be "created" now. */ }

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

        _disposing = true;

#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(String.Format(
                  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));
          }
      }
#endif

            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(String.Format(
                CultureInfo.CurrentCulture,
                "Shutdown (Instance) Failed: {0}", rc));
#endif

        return rc;
    }

    /// <summary>
    /// Passes a shutdown request to the SQLite core library.  Throws an

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

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

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

                    SQLiteBase.CloseConnection(this, localHandle);
#endif

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

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

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

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

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

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

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

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