System.Data.SQLite

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Overview
Comment:Modified to use the new utility type conversion helper(s) in SQLiteBase and SQLiteConvert
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SHA1: 6886e6f4fb169be9aa68071fedb70ed7b5ac125a
User & Date: rmsimpson 2005-03-04 21:31:58.000
Context
2005-03-04
21:32
Latest build check-in: 972b7cde17 user: rmsimpson tags: sourceforge
21:31
Modified to use the new utility type conversion helper(s) in SQLiteBase and SQLiteConvert check-in: 6886e6f4fb user: rmsimpson tags: sourceforge
21:30
Increased performance ExecuteScalar() and ExecuteNonQuery() resulting in a nice boost in the insert 100k rows tests and user-function tests check-in: 5f06409677 user: rmsimpson tags: sourceforge
Changes
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Changes to System.Data.SQLite/SQLiteDataReader.cs.
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namespace System.Data.SQLite
{
  using System;
  using System.Data;
  using System.Data.Common;
  using System.Collections.Generic;

  internal struct SQLiteType
  {
    internal DbType         Type;
    internal TypeAffinity Affinity;
  }

  /// <summary>
  /// SQLite implementation of DbDataReader.
  /// </summary>
  public sealed class SQLiteDataReader : DbDataReader
  {
    /// <summary>
    /// Underlying command this reader is attached to
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    private CommandBehavior _commandBehavior;

    internal SQLiteDataReader(SQLiteCommand cmd, CommandBehavior behave)
    {
      _command = cmd;
      _commandBehavior = behave;
      Initialize();

      if (_command != null)
        NextResult();
    }

    internal void Initialize()
    {
      _activeStatementIndex = -1;
      _activeStatement = null;
      _rowsAffected = -1;
      _fieldCount = -1;

      NextResult();
    }

    /// <summary>
    /// Closes the datareader, potentially closing the connection as well if CommandBehavior.CloseConnection was specified.
    /// </summary>
    public override void Close()
    {
      if (_command != null)
      {
        while (NextResult()) ;
        while (NextResult())
        {
        }
        _command.ClearDataReader();
      }

      // If the datareader's behavior includes closing the connection, then do so here.
      if ((_commandBehavior & CommandBehavior.CloseConnection) != 0)
        _command.Connection.Close();
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    /// <summary>
    /// 
    /// </summary>
    /// <param name="ordinal"></param>
    /// <returns></returns>
    public override Type GetFieldType(int ordinal)
    {
      SQLiteType t = GetSQLiteType(ordinal);
      return SQLiteConvert.SQLiteTypeToType(GetSQLiteType(ordinal));

      if (t.Type != DbType.Object)
        return SQLiteConvert.DbTypeToType(t.Type);

      switch (t.Affinity)
      {
        case TypeAffinity.Null:
          return typeof(DBNull);
        case TypeAffinity.Int64:
          return typeof(Int64);
        case TypeAffinity.Double:
          return typeof(Double);
        case TypeAffinity.Blob:
          return typeof(byte[]);
        default:
          return typeof(string);
      }
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="ordinal"></param>
    /// <returns></returns>
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    /// <summary>
    /// 
    /// </summary>
    /// <param name="ordinal"></param>
    /// <returns></returns>
    public override object GetValue(int ordinal)
    {
      if (IsDBNull(ordinal)) return DBNull.Value;

      SQLiteType typ = GetSQLiteType(ordinal);
      if (GetFieldType(ordinal) == typeof(byte[]))
      {

        int n = (int)GetBytes(ordinal, 0, null, 0, 0);
        byte[] b = new byte[n];
        GetBytes(ordinal, 0, b, 0, n);

      return _activeStatement._sql.GetValue(_activeStatement, ordinal, ref typ);
        return b;
      }

      return Convert.ChangeType(_activeStatement._sql.GetText(_activeStatement, ordinal), GetFieldType(ordinal), null);
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="values"></param>
    /// <returns></returns>
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