System.Data.SQLite
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Overview
Comment:1.0.31.0 code cleanup and fixes for view schemas
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | sourceforge
Files: files | file ages | folders
SHA1: 6ae6600f6fd3772ba1fa55b2d6e1360787139cd2
User & Date: rmsimpson 2006-07-16 17:44:32
Context
2006-07-16
17:46
Use package provider on full visualstudio versions check-in: 4060c752bc user: rmsimpson tags: sourceforge
17:44
1.0.31.0 code cleanup and fixes for view schemas check-in: 6ae6600f6f user: rmsimpson tags: sourceforge
17:43
1.0.31.0 - scalar function returns null instead of dbnull check-in: f96ea449db user: rmsimpson tags: sourceforge
Changes
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Changes to System.Data.SQLite/SQLiteConnection.cs.

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    /// <param name="isolationLevel">SQLite doesn't support varying isolation levels, so this parameter is ignored.</param>
    /// <param name="deferredLock">When TRUE, SQLite defers obtaining a write lock until a write operation is requested.
    /// When FALSE, a writelock is obtained immediately.  The default is TRUE, but in a multi-threaded multi-writer 
    /// environment, one may instead choose to lock the database immediately to avoid any possible writer deadlock.</param>
    /// <returns>Returns a SQLiteTransaction object.</returns>
    public SQLiteTransaction BeginTransaction(IsolationLevel isolationLevel, bool deferredLock)
    {
      return BeginTransaction(true);
    }

    /// <summary>
    /// Creates a new SQLiteTransaction if one isn't already active on the connection.
    /// </summary>
    /// <param name="deferredLock">When TRUE, SQLite defers obtaining a write lock until a write operation is requested.
    /// When FALSE, a writelock is obtained immediately.  The default is TRUE, but in a multi-threaded multi-writer 
................................................................................
    /// <summary>
    /// Forwards to the local BeginTransaction() function
    /// </summary>
    /// <param name="isolationLevel"></param>
    /// <returns></returns>
    protected override DbTransaction BeginDbTransaction(IsolationLevel isolationLevel)
    {
      return BeginTransaction(isolationLevel, false);
    }

    /// <summary>
    /// Not implemented
    /// </summary>
    /// <param name="databaseName"></param>
    public override void ChangeDatabase(string databaseName)
................................................................................
    /// <description>N</description>
    /// <description>Y</description>
    /// </item>
    /// </list>
    /// </remarks>
#if !PLATFORM_COMPACTFRAMEWORK
    [RefreshProperties(RefreshProperties.All), DefaultValue("")]
    [Editor("SQLite.Designer.SQLiteConnectionStringEditor, SQLite.Designer, Version=1.0.29.0, Culture=neutral, PublicKeyToken=db937bc2d44ff139", "System.Drawing.Design.UITypeEditor, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
#endif
    public override string ConnectionString
    {
      get
      {
        return _connectionString;
      }
................................................................................
      tbl.Columns.Add("PRIMARY_KEY", typeof(bool));

      tbl.BeginLoadData();

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

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

                        row["TABLE_NAME"] = rdTables.GetString(2);
                        row["COLUMN_NAME"] = schemaRow[SchemaTableColumn.ColumnName];
                        row["TABLE_CATALOG"] = strCatalog;
                        row["ORDINAL_POSITION"] = schemaRow[SchemaTableColumn.ColumnOrdinal];
                        row["COLUMN_HASDEFAULT"] = (schemaRow[SchemaTableOptionalColumn.DefaultValue] != DBNull.Value);
                        row["COLUMN_DEFAULT"] = schemaRow[SchemaTableOptionalColumn.DefaultValue];
                        row["IS_NULLABLE"] = schemaRow[SchemaTableColumn.AllowDBNull];
                        row["DATA_TYPE"] = schemaRow["DataTypeName"]; // SQLiteConvert.DbTypeToType((DbType)schemaRow[SchemaTableColumn.ProviderType]).ToString();
                        row["CHARACTER_MAXIMUM_LENGTH"] = schemaRow[SchemaTableColumn.ColumnSize];
                        row["TABLE_SCHEMA"] = schemaRow[SchemaTableColumn.BaseSchemaName];
                        row["PRIMARY_KEY"] = schemaRow[SchemaTableColumn.IsKey];

                        tbl.Rows.Add(row);
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }

................................................................................
      tbl.Columns.Add("INTEGRATED", typeof(bool));

      tbl.BeginLoadData();

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

      using (SQLiteCommand cmdTables = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'table'", strCatalog), this))
      {
        using (SQLiteDataReader rdTables = cmdTables.ExecuteReader())
        {
          while (rdTables.Read())
          {
            maybeRowId = false;
            primaryKeys.Clear();
            if (String.IsNullOrEmpty(strTable) || String.Compare(rdTables.GetString(2), strTable, true, CultureInfo.InvariantCulture) == 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.
              using (SQLiteCommand cmdTable = new SQLiteCommand(String.Format(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)
                    {
                      primaryKeys.Add(rdTable.GetInt32(0));

                      // If the primary key is of type INTEGER, then its a rowid and we need to make a fake index entry for it.
                      if (String.Compare(rdTable.GetString(2), "INTEGER", true, CultureInfo.InvariantCulture) == 0)
                        maybeRowId = true;
                    }
                  }
                }

                if (primaryKeys.Count == 1 && maybeRowId == true)



























                {
                  row = tbl.NewRow();

                  row["TABLE_CATALOG"] = strCatalog;
                  row["TABLE_NAME"] = rdTables.GetString(2);
                  row["INDEX_CATALOG"] = strCatalog;
                  row["PRIMARY_KEY"] = true;
                  row["INDEX_NAME"] = String.Format(CultureInfo.InvariantCulture, "sqlite_master_PK_{0}", rdTables.GetString(2));
                  row["UNIQUE"] = true;

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

                  primaryKeys.Clear();
                }
              }

              // Now fetch all the rest of the indexes.
              using (SQLiteCommand cmd = new SQLiteCommand(String.Format(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, true, CultureInfo.InvariantCulture) == 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"] = rd.GetBoolean(2);
                      row["PRIMARY_KEY"] = false;

                      // 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(String.Format(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)
                              {
                                nMatches = 0;
                                break;
                              }
                              nMatches++;
                            }
                            if (nMatches == primaryKeys.Count)
                            {
                              row["PRIMARY_KEY"] = true;
                              primaryKeys.Clear();
                            }
                          }
                        }
                      }

                      tbl.Rows.Add(row);
                    }
                  }
                }
              }
            }
          }
        }
      }

................................................................................
      tbl.Columns.Add("TABLE_TYPE", typeof(string));

      tbl.BeginLoadData();

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

      using (SQLiteCommand cmd = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'table'", strCatalog), this))
      {
        using (SQLiteDataReader rd = (SQLiteDataReader)cmd.ExecuteReader())
        {
          while (rd.Read())
          {
            strItem = rd.GetString(0);
            if (String.Compare(rd.GetString(2), 0, "SQLITE_", 0, 7, true, CultureInfo.InvariantCulture) == 0)
              strItem = "SYSTEM_TABLE";

            if (String.Compare(strType, strItem, true, CultureInfo.InvariantCulture) == 0
              || strType == null)
            {
              if (String.Compare(rd.GetString(2), strTable, true, CultureInfo.InvariantCulture) == 0
                || strTable == null)
              {
                row = tbl.NewRow();

                row["TABLE_CATALOG"] = strCatalog;
                row["TABLE_NAME"] = rd.GetString(2);
                row["TABLE_TYPE"] = strItem;

                tbl.Rows.Add(row);
              }
            }
          }
        }
      }

      tbl.AcceptChanges();
      tbl.EndLoadData();
................................................................................
      tbl.Columns.Add("DATE_MODIFIED", typeof(DateTime));

      tbl.BeginLoadData();

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

      using (SQLiteCommand cmd = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'view'", strCatalog), this))
      {
        using (SQLiteDataReader rd = (SQLiteDataReader)cmd.ExecuteReader())
        {
          while (rd.Read())
          {
            if (String.Compare(rd.GetString(1), strView, true, CultureInfo.InvariantCulture) == 0
              || String.IsNullOrEmpty(strView))
            {
              strItem = rd.GetString(4).Replace('\r', ' ').Replace('\n', ' ').Replace('\t', ' ');
              nPos = Globalization.CultureInfo.InvariantCulture.CompareInfo.IndexOf(strItem, " AS ", CompareOptions.IgnoreCase);
              if (nPos > -1)
              {
                strItem = strItem.Substring(nPos + 4).Trim();
                row = tbl.NewRow();

                row["TABLE_CATALOG"] = strCatalog;
                row["TABLE_NAME"] = rd.GetString(2);
                row["IS_UPDATABLE"] = false;
                row["VIEW_DEFINITION"] = strItem;

                tbl.Rows.Add(row);
              }
            }
          }
        }
      }

      tbl.AcceptChanges();
      tbl.EndLoadData();
................................................................................
      tbl.Locale = CultureInfo.InvariantCulture;
      tbl.Columns.Add("CATALOG_NAME", typeof(string));
      tbl.Columns.Add("DESCRIPTION", typeof(string));

      tbl.BeginLoadData();

      using (SQLiteCommand cmd = new SQLiteCommand("PRAGMA database_list", this))
      {
        using (SQLiteDataReader rd = (SQLiteDataReader)cmd.ExecuteReader())
        {
          while (rd.Read())
          {
            if (String.Compare(rd.GetString(1), strCatalog, true, CultureInfo.InvariantCulture) == 0
              || strCatalog == null)
            {
              row = tbl.NewRow();

              row["CATALOG_NAME"] = rd.GetString(1);
              row["DESCRIPTION"] = rd.GetString(2);

              tbl.Rows.Add(row);
            }
          }
        }
      }

      tbl.AcceptChanges();
      tbl.EndLoadData();

................................................................................
      tbl.Columns.Add("INDEX_NAME", typeof(string));

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

      tbl.BeginLoadData();

      using (SQLiteCommand cmdTables = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'table'", strCatalog), this))
      {
        using (SQLiteDataReader rdTables = cmdTables.ExecuteReader())
        {
          while (rdTables.Read())
          {
            maybeRowId = false;
            primaryKeys.Clear();
            if (String.IsNullOrEmpty(strTable) || String.Compare(rdTables.GetString(2), strTable, true, CultureInfo.InvariantCulture) == 0)
            {
              using (SQLiteCommand cmdTable = new SQLiteCommand(String.Format(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)));
                      // Is an integer -- could be a rowid if no other primary keys exist in the table
                      if (String.Compare(rdTable.GetString(2), "INTEGER", true, CultureInfo.InvariantCulture) == 0)
                        maybeRowId = true;
                    }
                  }
                }
                if (primaryKeys.Count == 1 && maybeRowId == true)
                {
                  row = tbl.NewRow();
                  row["CONSTRAINT_CATALOG"] = strCatalog;
                  row["CONSTRAINT_NAME"] = String.Format(CultureInfo.InvariantCulture, "sqlite_master_PK_{0}", rdTables.GetString(2));
                  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"] = primaryKeys[0].Key;

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

              using (SQLiteCommand cmdIndexes = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'index' AND [tbl_name] LIKE '{1}'", strCatalog, rdTables.GetString(2).Replace("'", "''")), this))
              {
                using (SQLiteDataReader rdIndexes = cmdIndexes.ExecuteReader())
                {
                  while (rdIndexes.Read())
                  {
                    if (String.IsNullOrEmpty(strIndex) || String.Compare(strIndex, rdIndexes.GetString(1), true, CultureInfo.InvariantCulture) == 0)
                    {
                      using (SQLiteCommand cmdIndex = new SQLiteCommand(String.Format(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);
                            row["TABLE_CATALOG"] = strCatalog;
                            row["TABLE_NAME"] = rdIndexes.GetString(2);
                            row["COLUMN_NAME"] = rdIndex.GetString(2);
                            row["INDEX_NAME"] = rdIndexes.GetString(1);
                            row["ORDINAL_POSITION"] = rdIndex.GetInt32(1);

                            if (String.IsNullOrEmpty(strColumn) || String.Compare(strColumn, row["COLUMN_NAME"].ToString(), true, CultureInfo.InvariantCulture) == 0)
                              tbl.Rows.Add(row);
                          }
                        }
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }


      tbl.EndLoadData();
      tbl.AcceptChanges();

      return tbl;
    }

................................................................................
      tbl.Columns.Add("COLUMN_NAME", typeof(string));

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

      tbl.BeginLoadData();

      using (SQLiteCommand cmdViews = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'view'", strCatalog), this))
      {
        using (SQLiteDataReader rdViews = cmdViews.ExecuteReader())
        {
          while (rdViews.Read())
          {
            if (String.IsNullOrEmpty(strView) || String.Compare(strView, rdViews.GetString(2), true, CultureInfo.InvariantCulture) == 0)
            {
              using (SQLiteCommand cmdViewSelect = new SQLiteCommand(String.Format(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);

                using (SQLiteCommand cmd = new SQLiteCommand(strSql, this))
                {
                  using (SQLiteDataReader rdViewSelect = cmdViewSelect.ExecuteReader(CommandBehavior.SchemaOnly))
                  {
                    using (SQLiteDataReader rd = (SQLiteDataReader)cmd.ExecuteReader(CommandBehavior.SchemaOnly))
                    {
                      using (DataTable tblSchemaView = rdViewSelect.GetSchemaTable(false, false))
                      {
                        using (DataTable tblSchema = rd.GetSchemaTable(false, false))
                        {
                          for (n = 0; n < tblSchema.Rows.Count; n++)
                          {
                            viewRow = tblSchemaView.Rows[n];
                            schemaRow = tblSchema.Rows[n];

                            if (String.Compare(viewRow[SchemaTableColumn.ColumnName].ToString(), strColumn, true, CultureInfo.InvariantCulture) == 0
                              || strColumn == null)
                            {
                              row = tbl.NewRow();

                              row["VIEW_CATALOG"] = strCatalog;
                              row["VIEW_NAME"] = rdViews.GetString(2);
                              row["TABLE_CATALOG"] = strCatalog;
                              row["TABLE_SCHEMA"] = schemaRow[SchemaTableColumn.BaseSchemaName];
                              row["TABLE_NAME"] = schemaRow[SchemaTableColumn.BaseTableName];
                              row["COLUMN_NAME"] = schemaRow[SchemaTableColumn.ColumnName];
                              row["VIEW_COLUMN_NAME"] = viewRow[SchemaTableColumn.ColumnName];

                              tbl.Rows.Add(row);
                            }
                          }
                        }
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
................................................................................
      tbl.Columns.Add("FKEY_TO_COLUMN", typeof(string));

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

      tbl.BeginLoadData();

      using (SQLiteCommand cmdTables = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'table'", strCatalog), this))
      {
        using (SQLiteDataReader rdTables = cmdTables.ExecuteReader())
        {
          while (rdTables.Read())
          {
            if (String.IsNullOrEmpty(strTable) || String.Compare(strTable, rdTables.GetString(2), true, CultureInfo.InvariantCulture) == 0)
            {
              using (SQLiteCommand cmdTable = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[{1}]", strCatalog, rdTables.GetString(2)), this))
              {
                using (SQLiteDataReader rdTable = cmdTable.ExecuteReader(CommandBehavior.SchemaOnly))
                {
                  using (SQLiteCommand cmdKey = new SQLiteCommand(String.Format(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"] = String.Format(CultureInfo.InvariantCulture, "FK_{0}_{1}_{2}", rdTables.GetString(2), rdKey.GetString(3), rdKey.GetString(4));
                        row["TABLE_CATALOG"] = strCatalog;
                        row["TABLE_NAME"] = rdTables.GetString(2);
                        row["CONSTRAINT_TYPE"] = "FOREIGN KEY";
                        row["IS_DEFERRABLE"] = false;
                        row["INITIALLY_DEFERRED"] = false;
                        row["FKEY_FROM_COLUMN"] = rdKey.GetString(3);
                        row["FKEY_FROM_ORDINAL_POSITION"] = rdTable.GetOrdinal(row["FKEY_FROM_COLUMN"].ToString());
                        row["FKEY_TO_CATALOG"] = strCatalog;
                        row["FKEY_TO_TABLE"] = rdKey.GetString(2);
                        row["FKEY_TO_COLUMN"] = rdKey.GetString(4);

                        if (String.IsNullOrEmpty(strKeyName) || String.Compare(strKeyName, row["CONSTRAINT_NAME"].ToString(), true, CultureInfo.InvariantCulture) == 0)
                          tbl.Rows.Add(row);
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }

      tbl.EndLoadData();







|







 







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    /// <param name="isolationLevel">SQLite doesn't support varying isolation levels, so this parameter is ignored.</param>
    /// <param name="deferredLock">When TRUE, SQLite defers obtaining a write lock until a write operation is requested.
    /// When FALSE, a writelock is obtained immediately.  The default is TRUE, but in a multi-threaded multi-writer 
    /// environment, one may instead choose to lock the database immediately to avoid any possible writer deadlock.</param>
    /// <returns>Returns a SQLiteTransaction object.</returns>
    public SQLiteTransaction BeginTransaction(IsolationLevel isolationLevel, bool deferredLock)
    {
      return BeginTransaction(deferredLock);
    }

    /// <summary>
    /// Creates a new SQLiteTransaction if one isn't already active on the connection.
    /// </summary>
    /// <param name="deferredLock">When TRUE, SQLite defers obtaining a write lock until a write operation is requested.
    /// When FALSE, a writelock is obtained immediately.  The default is TRUE, but in a multi-threaded multi-writer 
................................................................................
    /// <summary>
    /// Forwards to the local BeginTransaction() function
    /// </summary>
    /// <param name="isolationLevel"></param>
    /// <returns></returns>
    protected override DbTransaction BeginDbTransaction(IsolationLevel isolationLevel)
    {
      return BeginTransaction(false);
    }

    /// <summary>
    /// Not implemented
    /// </summary>
    /// <param name="databaseName"></param>
    public override void ChangeDatabase(string databaseName)
................................................................................
    /// <description>N</description>
    /// <description>Y</description>
    /// </item>
    /// </list>
    /// </remarks>
#if !PLATFORM_COMPACTFRAMEWORK
    [RefreshProperties(RefreshProperties.All), DefaultValue("")]
    [Editor("SQLite.Designer.SQLiteConnectionStringEditor, SQLite.Designer, Version=1.0.31.0, Culture=neutral, PublicKeyToken=db937bc2d44ff139", "System.Drawing.Design.UITypeEditor, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
#endif
    public override string ConnectionString
    {
      get
      {
        return _connectionString;
      }
................................................................................
      tbl.Columns.Add("PRIMARY_KEY", typeof(bool));

      tbl.BeginLoadData();

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

      using (SQLiteCommand cmdTables = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'table' OR [type] LIKE 'view'", strCatalog), this))

      using (SQLiteDataReader rdTables = cmdTables.ExecuteReader())
      {
        while (rdTables.Read())
        {
          if (String.IsNullOrEmpty(strTable) || String.Compare(strTable, rdTables.GetString(2), true, CultureInfo.InvariantCulture) == 0)
          {
            using (SQLiteCommand cmd = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[{1}]", strCatalog, rdTables.GetString(2)), this))

            using (SQLiteDataReader rd = (SQLiteDataReader)cmd.ExecuteReader(CommandBehavior.SchemaOnly))

            using (DataTable tblSchema = rd.GetSchemaTable(false, true))
            {
              foreach (DataRow schemaRow in tblSchema.Rows)
              {
                if (String.Compare(schemaRow[SchemaTableColumn.ColumnName].ToString(), strColumn, true, CultureInfo.InvariantCulture) == 0
                  || strColumn == null)
                {
                  row = tbl.NewRow();

                  row["TABLE_NAME"] = rdTables.GetString(2);
                  row["COLUMN_NAME"] = schemaRow[SchemaTableColumn.ColumnName];
                  row["TABLE_CATALOG"] = strCatalog;
                  row["ORDINAL_POSITION"] = schemaRow[SchemaTableColumn.ColumnOrdinal];
                  row["COLUMN_HASDEFAULT"] = (schemaRow[SchemaTableOptionalColumn.DefaultValue] != DBNull.Value);
                  row["COLUMN_DEFAULT"] = schemaRow[SchemaTableOptionalColumn.DefaultValue];
                  row["IS_NULLABLE"] = schemaRow[SchemaTableColumn.AllowDBNull];
                  row["DATA_TYPE"] = schemaRow["DataTypeName"]; // SQLiteConvert.DbTypeToType((DbType)schemaRow[SchemaTableColumn.ProviderType]).ToString();
                  row["CHARACTER_MAXIMUM_LENGTH"] = schemaRow[SchemaTableColumn.ColumnSize];
                  row["TABLE_SCHEMA"] = schemaRow[SchemaTableColumn.BaseSchemaName];
                  row["PRIMARY_KEY"] = schemaRow[SchemaTableColumn.IsKey];

                  tbl.Rows.Add(row);



                }
              }
            }
          }
        }
      }

................................................................................
      tbl.Columns.Add("INTEGRATED", typeof(bool));

      tbl.BeginLoadData();

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

      using (SQLiteCommand cmdTables = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'table'", strCatalog), this))

      using (SQLiteDataReader rdTables = cmdTables.ExecuteReader())
      {
        while (rdTables.Read())
        {
          maybeRowId = false;
          primaryKeys.Clear();
          if (String.IsNullOrEmpty(strTable) || String.Compare(rdTables.GetString(2), strTable, true, CultureInfo.InvariantCulture) == 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.
            using (SQLiteCommand cmdTable = new SQLiteCommand(String.Format(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)
                {
                  primaryKeys.Add(rdTable.GetInt32(0));

                  // If the primary key is of type INTEGER, then its a rowid and we need to make a fake index entry for it.
                  if (String.Compare(rdTable.GetString(2), "INTEGER", true, CultureInfo.InvariantCulture) == 0)
                    maybeRowId = true;
                }
              }
            }

            if (primaryKeys.Count == 1 && maybeRowId == true)
            {
              row = tbl.NewRow();

              row["TABLE_CATALOG"] = strCatalog;
              row["TABLE_NAME"] = rdTables.GetString(2);
              row["INDEX_CATALOG"] = strCatalog;
              row["PRIMARY_KEY"] = true;
              row["INDEX_NAME"] = String.Format(CultureInfo.InvariantCulture, "sqlite_master_PK_{0}", rdTables.GetString(2));
              row["UNIQUE"] = true;

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

              primaryKeys.Clear();
            }

            // Now fetch all the rest of the indexes.
            using (SQLiteCommand cmd = new SQLiteCommand(String.Format(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, true, CultureInfo.InvariantCulture) == 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"] = rd.GetBoolean(2);
                  row["PRIMARY_KEY"] = false;

                  // 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(String.Format(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)
                        {
                          nMatches = 0;
                          break;
                        }
                        nMatches++;
                      }
                      if (nMatches == primaryKeys.Count)
                      {
                        row["PRIMARY_KEY"] = true;
                        primaryKeys.Clear();
                      }
                    }
                  }


                  tbl.Rows.Add(row);


                }
              }
            }
          }
        }
      }

................................................................................
      tbl.Columns.Add("TABLE_TYPE", typeof(string));

      tbl.BeginLoadData();

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

      using (SQLiteCommand cmd = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'table'", strCatalog), this))

      using (SQLiteDataReader rd = (SQLiteDataReader)cmd.ExecuteReader())
      {
        while (rd.Read())
        {
          strItem = rd.GetString(0);
          if (String.Compare(rd.GetString(2), 0, "SQLITE_", 0, 7, true, CultureInfo.InvariantCulture) == 0)
            strItem = "SYSTEM_TABLE";

          if (String.Compare(strType, strItem, true, CultureInfo.InvariantCulture) == 0
            || strType == null)
          {
            if (String.Compare(rd.GetString(2), strTable, true, CultureInfo.InvariantCulture) == 0
              || strTable == null)
            {
              row = tbl.NewRow();

              row["TABLE_CATALOG"] = strCatalog;
              row["TABLE_NAME"] = rd.GetString(2);
              row["TABLE_TYPE"] = strItem;

              tbl.Rows.Add(row);

            }
          }
        }
      }

      tbl.AcceptChanges();
      tbl.EndLoadData();
................................................................................
      tbl.Columns.Add("DATE_MODIFIED", typeof(DateTime));

      tbl.BeginLoadData();

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

      using (SQLiteCommand cmd = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'view'", strCatalog), this))

      using (SQLiteDataReader rd = (SQLiteDataReader)cmd.ExecuteReader())
      {
        while (rd.Read())
        {
          if (String.Compare(rd.GetString(1), strView, true, CultureInfo.InvariantCulture) == 0
            || String.IsNullOrEmpty(strView))
          {
            strItem = rd.GetString(4).Replace('\r', ' ').Replace('\n', ' ').Replace('\t', ' ');
            nPos = Globalization.CultureInfo.InvariantCulture.CompareInfo.IndexOf(strItem, " AS ", CompareOptions.IgnoreCase);
            if (nPos > -1)
            {
              strItem = strItem.Substring(nPos + 4).Trim();
              row = tbl.NewRow();

              row["TABLE_CATALOG"] = strCatalog;
              row["TABLE_NAME"] = rd.GetString(2);
              row["IS_UPDATABLE"] = false;
              row["VIEW_DEFINITION"] = strItem;

              tbl.Rows.Add(row);

            }
          }
        }
      }

      tbl.AcceptChanges();
      tbl.EndLoadData();
................................................................................
      tbl.Locale = CultureInfo.InvariantCulture;
      tbl.Columns.Add("CATALOG_NAME", typeof(string));
      tbl.Columns.Add("DESCRIPTION", typeof(string));

      tbl.BeginLoadData();

      using (SQLiteCommand cmd = new SQLiteCommand("PRAGMA database_list", this))

      using (SQLiteDataReader rd = (SQLiteDataReader)cmd.ExecuteReader())
      {
        while (rd.Read())
        {
          if (String.Compare(rd.GetString(1), strCatalog, true, CultureInfo.InvariantCulture) == 0
            || strCatalog == null)
          {
            row = tbl.NewRow();

            row["CATALOG_NAME"] = rd.GetString(1);
            row["DESCRIPTION"] = rd.GetString(2);

            tbl.Rows.Add(row);

          }
        }
      }

      tbl.AcceptChanges();
      tbl.EndLoadData();

................................................................................
      tbl.Columns.Add("INDEX_NAME", typeof(string));

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

      tbl.BeginLoadData();

      using (SQLiteCommand cmdTables = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'table'", strCatalog), this))

      using (SQLiteDataReader rdTables = cmdTables.ExecuteReader())
      {
        while (rdTables.Read())
        {
          maybeRowId = false;
          primaryKeys.Clear();
          if (String.IsNullOrEmpty(strTable) || String.Compare(rdTables.GetString(2), strTable, true, CultureInfo.InvariantCulture) == 0)
          {
            using (SQLiteCommand cmdTable = new SQLiteCommand(String.Format(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)));
                  // Is an integer -- could be a rowid if no other primary keys exist in the table
                  if (String.Compare(rdTable.GetString(2), "INTEGER", true, CultureInfo.InvariantCulture) == 0)
                    maybeRowId = true;
                }
              }
            }
            if (primaryKeys.Count == 1 && maybeRowId == true)
            {
              row = tbl.NewRow();
              row["CONSTRAINT_CATALOG"] = strCatalog;
              row["CONSTRAINT_NAME"] = String.Format(CultureInfo.InvariantCulture, "sqlite_master_PK_{0}", rdTables.GetString(2));
              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"] = primaryKeys[0].Key;

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


            using (SQLiteCommand cmdIndexes = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'index' AND [tbl_name] LIKE '{1}'", strCatalog, rdTables.GetString(2).Replace("'", "''")), this))

            using (SQLiteDataReader rdIndexes = cmdIndexes.ExecuteReader())
            {
              while (rdIndexes.Read())
              {
                if (String.IsNullOrEmpty(strIndex) || String.Compare(strIndex, rdIndexes.GetString(1), true, CultureInfo.InvariantCulture) == 0)
                {
                  using (SQLiteCommand cmdIndex = new SQLiteCommand(String.Format(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);
                      row["TABLE_CATALOG"] = strCatalog;
                      row["TABLE_NAME"] = rdIndexes.GetString(2);
                      row["COLUMN_NAME"] = rdIndex.GetString(2);
                      row["INDEX_NAME"] = rdIndexes.GetString(1);
                      row["ORDINAL_POSITION"] = rdIndex.GetInt32(1);

                      if (String.IsNullOrEmpty(strColumn) || String.Compare(strColumn, row["COLUMN_NAME"].ToString(), true, CultureInfo.InvariantCulture) == 0)
                        tbl.Rows.Add(row);



                    }
                  }
                }
              }
            }
          }
        }
      }


      tbl.EndLoadData();
      tbl.AcceptChanges();

      return tbl;
    }

................................................................................
      tbl.Columns.Add("COLUMN_NAME", typeof(string));

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

      tbl.BeginLoadData();

      using (SQLiteCommand cmdViews = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'view'", strCatalog), this))

      using (SQLiteDataReader rdViews = cmdViews.ExecuteReader())
      {
        while (rdViews.Read())
        {
          if (String.IsNullOrEmpty(strView) || String.Compare(strView, rdViews.GetString(2), true, CultureInfo.InvariantCulture) == 0)
          {
            using (SQLiteCommand cmdViewSelect = new SQLiteCommand(String.Format(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);

              using (SQLiteCommand cmd = new SQLiteCommand(strSql, this))

              using (SQLiteDataReader rdViewSelect = cmdViewSelect.ExecuteReader(CommandBehavior.SchemaOnly))

              using (SQLiteDataReader rd = (SQLiteDataReader)cmd.ExecuteReader(CommandBehavior.SchemaOnly))

              using (DataTable tblSchemaView = rdViewSelect.GetSchemaTable(false, false))

              using (DataTable tblSchema = rd.GetSchemaTable(false, false))
              {
                for (n = 0; n < tblSchema.Rows.Count; n++)
                {
                  viewRow = tblSchemaView.Rows[n];
                  schemaRow = tblSchema.Rows[n];

                  if (String.Compare(viewRow[SchemaTableColumn.ColumnName].ToString(), strColumn, true, CultureInfo.InvariantCulture) == 0
                    || strColumn == null)
                  {
                    row = tbl.NewRow();

                    row["VIEW_CATALOG"] = strCatalog;
                    row["VIEW_NAME"] = rdViews.GetString(2);
                    row["TABLE_CATALOG"] = strCatalog;
                    row["TABLE_SCHEMA"] = schemaRow[SchemaTableColumn.BaseSchemaName];
                    row["TABLE_NAME"] = schemaRow[SchemaTableColumn.BaseTableName];
                    row["COLUMN_NAME"] = schemaRow[SchemaTableColumn.ColumnName];
                    row["VIEW_COLUMN_NAME"] = viewRow[SchemaTableColumn.ColumnName];

                    tbl.Rows.Add(row);





                  }
                }
              }
            }
          }
        }
      }
................................................................................
      tbl.Columns.Add("FKEY_TO_COLUMN", typeof(string));

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

      tbl.BeginLoadData();

      using (SQLiteCommand cmdTables = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[sqlite_master] WHERE [type] LIKE 'table'", strCatalog), this))

      using (SQLiteDataReader rdTables = cmdTables.ExecuteReader())
      {
        while (rdTables.Read())
        {
          if (String.IsNullOrEmpty(strTable) || String.Compare(strTable, rdTables.GetString(2), true, CultureInfo.InvariantCulture) == 0)
          {
            using (SQLiteCommand cmdTable = new SQLiteCommand(String.Format(CultureInfo.InvariantCulture, "SELECT * FROM [{0}].[{1}]", strCatalog, rdTables.GetString(2)), this))

            using (SQLiteDataReader rdTable = cmdTable.ExecuteReader(CommandBehavior.SchemaOnly))

            using (SQLiteCommand cmdKey = new SQLiteCommand(String.Format(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"] = String.Format(CultureInfo.InvariantCulture, "FK_{0}_{1}_{2}", rdTables.GetString(2), rdKey.GetString(3), rdKey.GetString(4));
                row["TABLE_CATALOG"] = strCatalog;
                row["TABLE_NAME"] = rdTables.GetString(2);
                row["CONSTRAINT_TYPE"] = "FOREIGN KEY";
                row["IS_DEFERRABLE"] = false;
                row["INITIALLY_DEFERRED"] = false;
                row["FKEY_FROM_COLUMN"] = rdKey.GetString(3);
                row["FKEY_FROM_ORDINAL_POSITION"] = rdTable.GetOrdinal(row["FKEY_FROM_COLUMN"].ToString());
                row["FKEY_TO_CATALOG"] = strCatalog;
                row["FKEY_TO_TABLE"] = rdKey.GetString(2);
                row["FKEY_TO_COLUMN"] = rdKey.GetString(4);

                if (String.IsNullOrEmpty(strKeyName) || String.Compare(strKeyName, row["CONSTRAINT_NAME"].ToString(), true, CultureInfo.InvariantCulture) == 0)
                  tbl.Rows.Add(row);




              }
            }
          }
        }
      }

      tbl.EndLoadData();