System.Data.SQLite

Check-in [1f38aec2e8]
Login

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Added more internal-use utility type conversion helpers
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | sourceforge
Files: files | file ages | folders
SHA1: 1f38aec2e8a8ed7f148571d284e80dfa507d8fa4
User & Date: rmsimpson 2005-03-04 21:30:11.000
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
Unified Diff Ignore Whitespace Patch
Changes to System.Data.SQLite/SQLiteBase.cs.
︙︙
130
131
132
133
134
135
136



















137
138
139
140
141
142
143

    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);








>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>








130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162

    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.
︙︙
61
62
63
64
65
66
67






68
69
70
71
72
73
74

    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>








>
>
>
>
>
>








61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80

    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>
︙︙
307
308
309
310
311
312
313





























314
315
316
317
318
319
320

      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)
    {








>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>








313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355

      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)
    {
︙︙