wasCSharpSQLite – Blame information for rev
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Rev | Author | Line No. | Line |
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1 | office | 1 | // $Header$ |
2 | using System; |
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3 | using System.Collections; |
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4 | using System.Data; |
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5 | |||
6 | namespace Community.CsharpSqlite |
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7 | { |
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8 | |||
9 | using sqlite = Sqlite3.sqlite3; |
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10 | using Vdbe = Sqlite3.Vdbe; |
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11 | /// <summary> |
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12 | /// C#-SQLite wrapper with functions for opening, closing and executing queries. |
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13 | /// </summary> |
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14 | public class SQLiteDatabase |
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15 | { |
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16 | // pointer to database |
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17 | private sqlite db; |
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18 | |||
19 | /// <summary> |
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20 | /// Creates new instance of SQLiteBase class with no database attached. |
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21 | /// </summary> |
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22 | public SQLiteDatabase() |
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23 | { |
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24 | db = null; |
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25 | } |
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26 | /// <summary> |
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27 | /// Creates new instance of SQLiteDatabase class and opens database with given name. |
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28 | /// </summary> |
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29 | /// <param name="DatabaseName">Name (and path) to SQLite database file</param> |
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30 | public SQLiteDatabase( String DatabaseName ) |
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31 | { |
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32 | OpenDatabase( DatabaseName ); |
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33 | } |
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34 | |||
35 | /// <summary> |
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36 | /// Opens database. |
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37 | /// </summary> |
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38 | /// <param name="DatabaseName">Name of database file</param> |
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39 | public void OpenDatabase( String DatabaseName ) |
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40 | { |
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41 | // opens database |
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42 | if ( |
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43 | #if NET_35 |
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44 | Sqlite3.Open |
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45 | #else |
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46 | Sqlite3.sqlite3_open |
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47 | #endif |
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48 | ( DatabaseName, out db ) != Sqlite3.SQLITE_OK ) |
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49 | { |
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50 | // if there is some error, database pointer is set to 0 and exception is throws |
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51 | db = null; |
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52 | throw new Exception( "Error with opening database " + DatabaseName + "!" ); |
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53 | } |
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54 | } |
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55 | |||
56 | /// <summary> |
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57 | /// Closes opened database. |
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58 | /// </summary> |
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59 | public void CloseDatabase() |
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60 | { |
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61 | // closes the database if there is one opened |
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62 | if ( db != null ) |
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63 | { |
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64 | #if NET_35 |
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65 | Sqlite3.Close |
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66 | #else |
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67 | Sqlite3.sqlite3_close |
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68 | #endif |
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69 | ( db ); |
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70 | } |
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71 | } |
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72 | |||
73 | /// <summary> |
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74 | /// Returns connection |
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75 | /// </summary> |
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76 | public sqlite Connection() |
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77 | { |
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78 | return db; |
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79 | } |
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80 | |||
81 | /// <summary> |
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82 | /// Returns the list of tables in opened database. |
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83 | /// </summary> |
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84 | /// <returns></returns> |
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85 | public ArrayList GetTables() |
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86 | { |
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87 | // executes query that select names of all tables in master table of the database |
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88 | String query = "SELECT name FROM sqlite_master " + |
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89 | "WHERE type = 'table'" + |
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90 | "ORDER BY 1"; |
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91 | DataTable table = ExecuteQuery( query ); |
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92 | |||
93 | // Return all table names in the ArrayList |
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94 | ArrayList list = new ArrayList(); |
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95 | foreach ( DataRow row in table.Rows ) |
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96 | { |
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97 | list.Add( row.ItemArray[0].ToString() ); |
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98 | } |
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99 | return list; |
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100 | } |
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101 | |||
102 | /// <summary> |
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103 | /// Executes query that does not return anything (e.g. UPDATE, INSERT, DELETE). |
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104 | /// </summary> |
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105 | /// <param name="query"></param> |
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106 | public void ExecuteNonQuery( String query ) |
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107 | { |
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108 | // calles SQLite function that executes non-query |
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109 | Sqlite3.exec( db, query, 0, 0, 0 ); |
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110 | // if there is error, excetion is thrown |
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111 | if ( db.errCode != Sqlite3.SQLITE_OK ) |
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112 | throw new Exception( "Error with executing non-query: \"" + query + "\"!\n" + |
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113 | #if NET_35 |
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114 | Sqlite3.Errmsg |
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115 | #else |
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116 | Sqlite3.sqlite3_errmsg |
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117 | #endif |
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118 | ( db ) ); |
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119 | } |
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120 | |||
121 | /// <summary> |
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122 | /// Executes query that does return something (e.g. SELECT). |
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123 | /// </summary> |
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124 | /// <param name="query"></param> |
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125 | /// <returns></returns> |
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126 | public DataTable ExecuteQuery( String query ) |
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127 | { |
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128 | // compiled query |
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129 | SQLiteVdbe statement = new SQLiteVdbe( this, query ); |
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130 | |||
131 | // table for result of query |
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132 | DataTable table = new DataTable(); |
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133 | |||
134 | // create new instance of DataTable with name "resultTable" |
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135 | table = new DataTable( "resultTable" ); |
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136 | |||
137 | // reads rows |
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138 | do { } while ( ReadNextRow( statement.VirtualMachine(), table ) == Sqlite3.SQLITE_ROW ); |
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139 | // finalize executing this query |
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140 | statement.Close(); |
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141 | |||
142 | // returns table |
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143 | return table; |
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144 | } |
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145 | |||
146 | // private function for reading rows and creating table and columns |
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147 | private int ReadNextRow( Vdbe vm, DataTable table ) |
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148 | { |
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149 | int columnCount = table.Columns.Count; |
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150 | if ( columnCount == 0 ) |
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151 | { |
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152 | if ( ( columnCount = ReadColumnNames( vm, table ) ) == 0 ) return Sqlite3.SQLITE_ERROR; |
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153 | } |
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154 | |||
155 | int resultType; |
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156 | if ( ( resultType = |
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157 | #if NET_35 |
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158 | Sqlite3.Step |
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159 | #else |
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160 | Sqlite3.sqlite3_step |
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161 | #endif |
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162 | ( vm ) ) == Sqlite3.SQLITE_ROW ) |
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163 | { |
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164 | object[] columnValues = new object[columnCount]; |
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165 | |||
166 | for ( int i = 0; i < columnCount; i++ ) |
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167 | { |
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168 | int columnType = |
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169 | #if NET_35 |
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170 | Sqlite3.ColumnType |
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171 | #else |
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172 | Sqlite3.sqlite3_column_type |
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173 | #endif |
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174 | ( vm, i ); |
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175 | switch ( columnType ) |
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176 | { |
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177 | case Sqlite3.SQLITE_INTEGER: |
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178 | { |
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179 | table.Columns[i].DataType = typeof( Int64 ); |
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180 | columnValues[i] = |
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181 | #if NET_35 |
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182 | Sqlite3.ColumnInt |
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183 | #else |
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184 | Sqlite3.sqlite3_column_int |
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185 | #endif |
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186 | ( vm, i ); |
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187 | break; |
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188 | } |
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189 | case Sqlite3.SQLITE_FLOAT: |
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190 | { |
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191 | table.Columns[i].DataType = typeof( Double ); |
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192 | columnValues[i] = |
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193 | #if NET_35 |
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194 | Sqlite3.ColumnDouble |
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195 | #else |
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196 | Sqlite3.sqlite3_column_double |
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197 | #endif |
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198 | ( vm, i ); |
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199 | break; |
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200 | } |
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201 | case Sqlite3.SQLITE_TEXT: |
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202 | { |
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203 | table.Columns[i].DataType = typeof( String ); |
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204 | columnValues[i] = |
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205 | #if NET_35 |
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206 | Sqlite3.ColumnText |
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207 | #else |
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208 | Sqlite3.sqlite3_column_text |
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209 | #endif |
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210 | ( vm, i ); |
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211 | break; |
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212 | } |
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213 | case Sqlite3.SQLITE_BLOB: |
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214 | { |
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215 | table.Columns[i].DataType = typeof( Byte[] ); |
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216 | columnValues[i] = |
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217 | #if NET_35 |
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218 | Sqlite3.ColumnBlob |
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219 | #else |
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220 | Sqlite3.sqlite3_column_blob |
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221 | #endif |
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222 | ( vm, i ); |
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223 | break; |
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224 | } |
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225 | default: |
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226 | { |
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227 | table.Columns[i].DataType = null; |
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228 | columnValues[i] = ""; |
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229 | break; |
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230 | } |
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231 | } |
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232 | } |
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233 | table.Rows.Add( columnValues ); |
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234 | } |
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235 | return resultType; |
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236 | } |
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237 | // private function for creating Column Names |
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238 | // Return number of colums read |
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239 | private int ReadColumnNames( Vdbe vm, DataTable table ) |
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240 | { |
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241 | |||
242 | String columnName = ""; |
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243 | int columnType = 0; |
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244 | // returns number of columns returned by statement |
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245 | int columnCount = |
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246 | #if NET_35 |
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247 | Sqlite3.ColumnCount |
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248 | #else |
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249 | Sqlite3.sqlite3_column_count |
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250 | #endif |
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251 | ( vm ); |
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252 | object[] columnValues = new object[columnCount]; |
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253 | |||
254 | try |
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255 | { |
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256 | // reads columns one by one |
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257 | for ( int i = 0; i < columnCount; i++ ) |
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258 | { |
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259 | columnName = |
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260 | #if NET_35 |
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261 | Sqlite3.ColumnName |
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262 | #else |
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263 | Sqlite3.sqlite3_column_name |
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264 | #endif |
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265 | ( vm, i ); |
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266 | columnType = |
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267 | #if NET_35 |
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268 | Sqlite3.ColumnType |
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269 | #else |
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270 | Sqlite3.sqlite3_column_type |
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271 | #endif |
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272 | ( vm, i ); |
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273 | |||
274 | switch ( columnType ) |
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275 | { |
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276 | case Sqlite3.SQLITE_INTEGER: |
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277 | { |
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278 | // adds new integer column to table |
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279 | table.Columns.Add( columnName, Type.GetType( "System.Int64" ) ); |
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280 | break; |
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281 | } |
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282 | case Sqlite3.SQLITE_FLOAT: |
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283 | { |
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284 | table.Columns.Add( columnName, Type.GetType( "System.Double" ) ); |
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285 | break; |
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286 | } |
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287 | case Sqlite3.SQLITE_TEXT: |
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288 | { |
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289 | table.Columns.Add( columnName, Type.GetType( "System.String" ) ); |
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290 | break; |
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291 | } |
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292 | case Sqlite3.SQLITE_BLOB: |
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293 | { |
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294 | table.Columns.Add( columnName, Type.GetType( "System.byte[]" ) ); |
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295 | break; |
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296 | } |
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297 | default: |
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298 | { |
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299 | table.Columns.Add( columnName, Type.GetType( "System.String" ) ); |
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300 | break; |
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301 | } |
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302 | } |
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303 | } |
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304 | } |
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305 | catch |
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306 | { |
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307 | return 0; |
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308 | } |
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309 | return table.Columns.Count; |
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310 | } |
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311 | |||
312 | } |
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313 | } |