System.Data.SQLite
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Overview
Comment:Added more internal-use utility type conversion helpers
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SHA1: 1f38aec2e8a8ed7f148571d284e80dfa507d8fa4
User & Date: rmsimpson 2005-03-04 21:30:11
Context
2005-03-04
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
21:30
Added more internal-use utility type conversion helpers check-in: 1f38aec2e8 user: rmsimpson tags: sourceforge
21:29
More performance enhancements to SQLiteCommand check-in: 8502a3ae6d user: rmsimpson tags: sourceforge
Changes
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Changes to System.Data.SQLite/SQLiteBase.cs.

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    internal abstract Int32    GetInt32(SQLiteStatement stmt, int index);
    internal abstract Int64    GetInt64(SQLiteStatement stmt, int index);
    internal abstract string   GetText(SQLiteStatement stmt, int index);
    internal abstract long     GetBytes(SQLiteStatement stmt, int index, int nDataoffset, byte[] bDest, int nStart, int nLength);
    internal abstract long     GetChars(SQLiteStatement stmt, int index, int nDataoffset, char[] bDest, int nStart, int nLength);
    internal abstract DateTime GetDateTime(SQLiteStatement stmt, int index);
    internal abstract bool     IsNull(SQLiteStatement stmt, int index);




















    internal abstract int  CreateCollation(string strCollation, SQLiteCollation func);
    internal abstract int  CreateFunction(string strFunction, int nArgs, SQLiteCallback func, SQLiteCallback funcstep, SQLiteCallback funcfinal);
    internal abstract void FreeFunction(int nCookie);

    internal abstract int AggregateCount(int context);
    internal abstract int AggregateContext(int context);







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    internal abstract Int32    GetInt32(SQLiteStatement stmt, int index);
    internal abstract Int64    GetInt64(SQLiteStatement stmt, int index);
    internal abstract string   GetText(SQLiteStatement stmt, int index);
    internal abstract long     GetBytes(SQLiteStatement stmt, int index, int nDataoffset, byte[] bDest, int nStart, int nLength);
    internal abstract long     GetChars(SQLiteStatement stmt, int index, int nDataoffset, char[] bDest, int nStart, int nLength);
    internal abstract DateTime GetDateTime(SQLiteStatement stmt, int index);
    internal abstract bool     IsNull(SQLiteStatement stmt, int index);
    
    internal virtual  object   GetValue(SQLiteStatement stmt, int index, ref SQLiteType typ)
    {
      if (typ.Affinity == 0) typ = SQLiteConvert.ColumnToType(stmt, index);
      if (IsNull(stmt, index)) return DBNull.Value;
      
      Type t = SQLiteConvert.SQLiteTypeToType(typ);

      if (t == typeof(byte[]))
      {
        int n = (int)GetBytes(stmt, index, 0, null, 0, 0);
        byte[] b = new byte[n];
        GetBytes(stmt, index, 0, b, 0, n);

        return b;
      }

      return Convert.ChangeType(GetText(stmt, index), t, null);
    }

    internal abstract int  CreateCollation(string strCollation, SQLiteCollation func);
    internal abstract int  CreateFunction(string strFunction, int nArgs, SQLiteCallback func, SQLiteCallback funcstep, SQLiteCallback funcfinal);
    internal abstract void FreeFunction(int nCookie);

    internal abstract int AggregateCount(int context);
    internal abstract int AggregateContext(int context);

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

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    Ticks = 0,
    /// <summary>
    /// The default format for this provider.  More compatible with SQLite's intended usage of datetimes, but overall less accurate than Ticks as it doesn't
    /// natively support times down to fractions of a second.
    /// </summary>
    ISO8601 = 1,
  }







  /// <summary>
  /// This base class provides datatype conversion services for the SQLite provider.
  /// </summary>
  public abstract class SQLiteConvert
  {
    /// <summary>
................................................................................
      string[] ar = new string[ls.Count];
      ls.CopyTo(ar, 0);

      return ar;
    }

    #region Type Conversions





























    /// <summary>
    /// For a given intrinsic type, return a DbType
    /// </summary>
    /// <param name="typ">The native type to convert</param>
    /// <returns>The corresponding (closest match) DbType</returns>
    internal static DbType TypeToDbType(Type typ)
    {







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    Ticks = 0,
    /// <summary>
    /// The default format for this provider.  More compatible with SQLite's intended usage of datetimes, but overall less accurate than Ticks as it doesn't
    /// natively support times down to fractions of a second.
    /// </summary>
    ISO8601 = 1,
  }

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

  /// <summary>
  /// This base class provides datatype conversion services for the SQLite provider.
  /// </summary>
  public abstract class SQLiteConvert
  {
    /// <summary>
................................................................................
      string[] ar = new string[ls.Count];
      ls.CopyTo(ar, 0);

      return ar;
    }

    #region Type Conversions
    internal static SQLiteType ColumnToType(SQLiteStatement stmt, int ordinal)
    {
      SQLiteType typ;

      typ.Type = TypeNameToDbType(stmt._sql.ColumnType(stmt, ordinal, out typ.Affinity));

      return typ;
    }

    internal static Type SQLiteTypeToType(SQLiteType t)
    {
      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>
    /// For a given intrinsic type, return a DbType
    /// </summary>
    /// <param name="typ">The native type to convert</param>
    /// <returns>The corresponding (closest match) DbType</returns>
    internal static DbType TypeToDbType(Type typ)
    {