[a5a9f1]: System.Data.SQLite / SQLiteStatement.cs Maximize Restore History

Download this file

SQLiteStatement.cs    243 lines (217 with data), 7.6 kB

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
/********************************************************
* 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;
using System.Globalization;
/// <summary>
/// Represents a single SQL statement in SQLite.
/// </summary>
internal sealed class SQLiteStatement : IDisposable
{
/// <summary>
/// The underlying SQLite object this statement is bound to
/// </summary>
internal SQLiteBase _sql;
/// <summary>
/// The command text of this SQL statement
/// </summary>
internal string _sqlStatement;
/// <summary>
/// The actual statement pointer
/// </summary>
internal SQLiteStatementHandle _sqlite_stmt;
/// <summary>
/// An index from which unnamed parameters begin
/// </summary>
internal int _unnamedParameters;
/// <summary>
/// Names of the parameters as SQLite understands them to be
/// </summary>
internal string[] _paramNames;
/// <summary>
/// Parameters for this statement
/// </summary>
internal SQLiteParameter[] _paramValues;
/// <summary>
/// Command this statement belongs to (if any)
/// </summary>
internal SQLiteCommand _command;
private string[] _types;
/// <summary>
/// Initializes the statement and attempts to get all information about parameters in the statement
/// </summary>
/// <param name="sqlbase">The base SQLite object</param>
/// <param name="stmt">The statement</param>
/// <param name="strCommand">The command text for this statement</param>
/// <param name="previous">The previous command in a multi-statement command</param>
internal SQLiteStatement(SQLiteBase sqlbase, SQLiteStatementHandle stmt, string strCommand, SQLiteStatement previous)
{
_sql = sqlbase;
_sqlite_stmt = stmt;
_sqlStatement = strCommand;
// Determine parameters for this statement (if any) and prepare space for them.
int nCmdStart = 0;
int n = _sql.Bind_ParamCount(this);
int x;
string s;
if (n > 0)
{
if (previous != null)
nCmdStart = previous._unnamedParameters;
_paramNames = new string[n];
_paramValues = new SQLiteParameter[n];
for (x = 0; x < n; x++)
{
s = _sql.Bind_ParamName(this, x + 1);
if (String.IsNullOrEmpty(s))
{
s = String.Format(CultureInfo.InvariantCulture, ";{0}", nCmdStart);
nCmdStart++;
_unnamedParameters++;
}
_paramNames[x] = s;
_paramValues[x] = null;
}
}
}
/// <summary>
/// Called by SQLiteParameterCollection, this function determines if the specified parameter name belongs to
/// this statement, and if so, keeps a reference to the parameter so it can be bound later.
/// </summary>
/// <param name="s">The parameter name to map</param>
/// <param name="p">The parameter to assign it</param>
internal bool MapParameter(string s, SQLiteParameter p)
{
if (_paramNames == null) return false;
int startAt = 0;
if (s.Length > 0)
{
if (":$@;".IndexOf(s[0]) == -1)
startAt = 1;
}
int x = _paramNames.Length;
for (int n = 0; n < x; n++)
{
if (String.Compare(_paramNames[n], startAt, s, 0, Math.Max(_paramNames[n].Length - startAt, s.Length), true, CultureInfo.InvariantCulture) == 0)
{
_paramValues[n] = p;
return true;
}
}
return false;
}
#region IDisposable Members
/// <summary>
/// Disposes and finalizes the statement
/// </summary>
public void Dispose()
{
if (_sqlite_stmt != null)
{
_sqlite_stmt.Dispose();
}
_sqlite_stmt = null;
_paramNames = null;
_paramValues = null;
_sql = null;
_sqlStatement = null;
}
#endregion
/// <summary>
/// Bind all parameters, making sure the caller didn't miss any
/// </summary>
internal void BindParameters()
{
if (_paramNames == null) return;
int x = _paramNames.Length;
for (int n = 0; n < x; n++)
{
BindParameter(n + 1, _paramValues[n]);
}
}
/// <summary>
/// Perform the bind operation for an individual parameter
/// </summary>
/// <param name="index">The index of the parameter to bind</param>
/// <param name="param">The parameter we're binding</param>
private void BindParameter(int index, SQLiteParameter param)
{
if (param == null)
throw new SQLiteException((int)SQLiteErrorCode.Error, "Insufficient parameters supplied to the command");
object obj = param.Value;
DbType objType = param.DbType;
if (Convert.IsDBNull(obj) || obj == null)
{
_sql.Bind_Null(this, index);
return;
}
if (objType == DbType.Object)
objType = SQLiteConvert.TypeToDbType(obj.GetType());
switch (objType)
{
case DbType.Date:
case DbType.Time:
case DbType.DateTime:
_sql.Bind_DateTime(this, index, Convert.ToDateTime(obj, CultureInfo.CurrentCulture));
break;
case DbType.Int64:
case DbType.UInt64:
_sql.Bind_Int64(this, index, Convert.ToInt64(obj, CultureInfo.CurrentCulture));
break;
case DbType.Boolean:
case DbType.Int16:
case DbType.Int32:
case DbType.UInt16:
case DbType.UInt32:
case DbType.SByte:
case DbType.Byte:
_sql.Bind_Int32(this, index, Convert.ToInt32(obj, CultureInfo.CurrentCulture));
break;
case DbType.Single:
case DbType.Double:
case DbType.Currency:
//case DbType.Decimal: // Dont store decimal as double ... loses precision
_sql.Bind_Double(this, index, Convert.ToDouble(obj, CultureInfo.CurrentCulture));
break;
case DbType.Binary:
_sql.Bind_Blob(this, index, (byte[])obj);
break;
case DbType.Guid:
if (_command.Connection._binaryGuid == true)
_sql.Bind_Blob(this, index, ((Guid)obj).ToByteArray());
else
_sql.Bind_Text(this, index, obj.ToString());
break;
case DbType.Decimal: // Dont store decimal as double ... loses precision
_sql.Bind_Text(this, index, Convert.ToDecimal(obj, CultureInfo.CurrentCulture).ToString(CultureInfo.InvariantCulture));
break;
default:
_sql.Bind_Text(this, index, obj.ToString());
break;
}
}
internal string[] TypeDefinitions
{
get { return _types; }
}
internal void SetTypes(string typedefs)
{
int pos = typedefs.IndexOf("TYPES", 0, StringComparison.OrdinalIgnoreCase);
if (pos == -1) throw new ArgumentOutOfRangeException();
string[] types = typedefs.Substring(pos + 6).Replace(" ", "").Replace(";", "").Replace("\"", "").Replace("[", "").Replace("]", "").Replace("`","").Split(',', '\r', '\n', '\t');
int n;
for (n = 0; n < types.Length; n++)
{
if (String.IsNullOrEmpty(types[n]) == true)
types[n] = null;
}
_types = types;
}
}
}