c#连接sqlite数据库语句（c# 连接sqlite）

本文实例讲述了C#操作SQLite数据库方法。分享给大家供大家参考，具体如下：

SQLite介绍

SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine.

SQLite是一个开源、免费的小型RDBMS(关系型数据库)，能独立运行、无服务器、零配置、支持事物，用C实现，内存占用较小，支持绝大数的SQL92标准。

SQLite数据库官方主页：http://www.sqlite.org/index.html

C#操作SQLite Database

C#下SQLite操作驱动dll下载：System.Data.SQLite

C#使用SQLite步骤：

（1）新建一个project
（2）添加SQLite操作驱动dll引用
（3）使用API操作SQLite DataBase

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 using System; using System.Data.SQLite; namespace SQLiteSamples { class Program { //数据库连接 SQLiteConnection m_dbConnection; static void Main(string[] args) { Program p = new Program(); } public Program() { createNewDatabase(); connectToDatabase(); createTable(); fillTable(); printHighscores(); } //创建一个空的数据库 void createNewDatabase() { SQLiteConnection.CreateFile("MyDatabase.sqlite"); } //创建一个连接到指定数据库 void connectToDatabase() { m_dbConnection = new SQLiteConnection("Data Source=MyDatabase.sqlite;Version=3;"); m_dbConnection.Open(); } //在指定数据库中创建一个table void createTable() { string sql = "create table highscores (name varchar(20), score int)"; SQLiteCommand command = new SQLiteCommand(sql, m_dbConnection); command.ExecuteNonQuery(); } //插入一些数据 void fillTable() { string sql = "insert into highscores (name, score) values ('Me', 3000)"; SQLiteCommand command = new SQLiteCommand(sql, m_dbConnection); command.ExecuteNonQuery(); sql = "insert into highscores (name, score) values ('Myself', 6000)"; command = new SQLiteCommand(sql, m_dbConnection); command.ExecuteNonQuery(); sql = "insert into highscores (name, score) values ('And I', 9001)"; command = new SQLiteCommand(sql, m_dbConnection); command.ExecuteNonQuery(); } //使用sql查询语句，并显示结果 void printHighscores() { string sql = "select * from highscores order by score desc"; SQLiteCommand command = new SQLiteCommand(sql, m_dbConnection); SQLiteDataReader reader = command.ExecuteReader(); while (reader.Read()) Console.WriteLine("Name: " + reader["name"] + "\tScore: " + reader["score"]); Console.ReadLine(); } } }

关于SQLite的connection string说明：http://www.connectionstrings.com/sqlite/

SQLite GUI客户端列表：http://www.sqlite.org/cvstrac/wiki?p=ManagementTools

SQLite Administrator下载地址：http://download.orbmu2k.de/files/sqliteadmin.zip

操作SQLite Database的C#帮助类SQLite Helper

将一些常用的功能封装一下，封装成SQLite Helper类

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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 using System; using System.Data; using System.Text.RegularExpressions; using System.Xml; using System.IO; using System.Collections; using System.Data.SQLite; namespace DBUtility.SQLite { /// <summary> /// SQLiteHelper is a utility class similar to "SQLHelper" in MS /// Data Access Application Block and follows similar pattern. /// </summary> public class SQLiteHelper { /// <summary> /// Creates a new <see cref="SQLiteHelper"/> instance. The ctor is marked private since all members are static. /// </summary> private SQLiteHelper() { } /// <summary> /// Creates the command. /// </summary> /// <param name="connection">Connection.</param> /// <param name="commandText">Command text.</param> /// <param name="commandParameters">Command parameters.</param> /// <returns>SQLite Command</returns> public static SQLiteCommand CreateCommand(SQLiteConnection connection, string commandText, params SQLiteParameter[] commandParameters) { SQLiteCommand cmd = new SQLiteCommand(commandText, connection); if (commandParameters.Length > 0) { foreach (SQLiteParameter parm in commandParameters) cmd.Parameters.Add(parm); } return cmd; } /// <summary> /// Creates the command. /// </summary> /// <param name="connectionString">Connection string.</param> /// <param name="commandText">Command text.</param> /// <param name="commandParameters">Command parameters.</param> /// <returns>SQLite Command</returns> public static SQLiteCommand CreateCommand(string connectionString, string commandText, params SQLiteParameter[] commandParameters) { SQLiteConnection cn = new SQLiteConnection(connectionString); SQLiteCommand cmd = new SQLiteCommand(commandText, cn); if (commandParameters.Length > 0) { foreach (SQLiteParameter parm in commandParameters) cmd.Parameters.Add(parm); } return cmd; } /// <summary> /// Creates the parameter. /// </summary> /// <param name="parameterName">Name of the parameter.</param> /// <param name="parameterType">Parameter type.</param> /// <param name="parameterValue">Parameter value.</param> /// <returns>SQLiteParameter</returns> public static SQLiteParameter CreateParameter(string parameterName, System.Data.DbType parameterType, object parameterValue) { SQLiteParameter parameter = new SQLiteParameter(); parameter.DbType = parameterType; parameter.ParameterName = parameterName; parameter.Value = parameterValue; return parameter; } /// <summary> /// Shortcut method to execute dataset from SQL Statement and object[] arrray of parameter values /// </summary> /// <param name="connectionString">SQLite Connection string</param> /// <param name="commandText">SQL Statement with embedded "@param" style parameter names</param> /// <param name="paramList">object[] array of parameter values</param> /// <returns></returns> public static DataSet ExecuteDataSet(string connectionString, string commandText, object[] paramList) { SQLiteConnection cn = new SQLiteConnection(connectionString); SQLiteCommand cmd = cn.CreateCommand(); cmd.CommandText = commandText; if (paramList != null) { AttachParameters(cmd,commandText, paramList); } DataSet ds = new DataSet(); if (cn.State == ConnectionState.Closed) cn.Open(); SQLiteDataAdapter da = new SQLiteDataAdapter(cmd); da.Fill(ds); da.Dispose(); cmd.Dispose(); cn.Close(); return ds; } /// <summary> /// Shortcut method to execute dataset from SQL Statement and object[] arrray of parameter values /// </summary> /// <param name="cn">Connection.</param> /// <param name="commandText">Command text.</param> /// <param name="paramList">Param list.</param> /// <returns></returns> public static DataSet ExecuteDataSet(SQLiteConnection cn, string commandText, object[] paramList) { SQLiteCommand cmd = cn.CreateCommand(); cmd.CommandText = commandText; if (paramList != null) { AttachParameters(cmd,commandText, paramList); } DataSet ds = new DataSet(); if (cn.State == ConnectionState.Closed) cn.Open(); SQLiteDataAdapter da = new SQLiteDataAdapter(cmd); da.Fill(ds); da.Dispose(); cmd.Dispose(); cn.Close(); return ds; } /// <summary> /// Executes the dataset from a populated Command object. /// </summary> /// <param name="cmd">Fully populated SQLiteCommand</param> /// <returns>DataSet</returns> public static DataSet ExecuteDataset(SQLiteCommand cmd) { if (cmd.Connection.State == ConnectionState.Closed) cmd.Connection.Open(); DataSet ds = new DataSet(); SQLiteDataAdapter da = new SQLiteDataAdapter(cmd); da.Fill(ds); da.Dispose(); cmd.Connection.Close(); cmd.Dispose(); return ds; } /// <summary> /// Executes the dataset in a SQLite Transaction /// </summary> /// <param name="transaction">SQLiteTransaction. Transaction consists of Connection, Transaction, /// and Command, all of which must be created prior to making this method call. </param> /// <param name="commandText">Command text.</param> /// <param name="commandParameters">Sqlite Command parameters.</param> /// <returns>DataSet</returns> /// <remarks>user must examine Transaction Object and handle transaction.connection .Close, etc.</remarks> public static DataSet ExecuteDataset(SQLiteTransaction transaction, string commandText, params SQLiteParameter[] commandParameters) { if (transaction == null) throw new ArgumentNullException("transaction"); if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or committed, please provide an open transaction.", "transaction"); IDbCommand cmd = transaction.Connection.CreateCommand(); cmd.CommandText = commandText; foreach (SQLiteParameter parm in commandParameters) { cmd.Parameters.Add(parm); } if (transaction.Connection.State == ConnectionState.Closed) transaction.Connection.Open(); DataSet ds = ExecuteDataset((SQLiteCommand)cmd); return ds; } /// <summary> /// Executes the dataset with Transaction and object array of parameter values. /// </summary> /// <param name="transaction">SQLiteTransaction. Transaction consists of Connection, Transaction, /// and Command, all of which must be created prior to making this method call. </param> /// <param name="commandText">Command text.</param> /// <param name="commandParameters">object[] array of parameter values.</param> /// <returns>DataSet</returns> /// <remarks>user must examine Transaction Object and handle transaction.connection .Close, etc.</remarks> public static DataSet ExecuteDataset(SQLiteTransaction transaction, string commandText, object[] commandParameters) { if (transaction == null) throw new ArgumentNullException("transaction"); if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or committed, please provide an open transaction.", "transaction"); IDbCommand cmd = transaction.Connection.CreateCommand(); cmd.CommandText = commandText; AttachParameters((SQLiteCommand)cmd,cmd.CommandText, commandParameters); if (transaction.Connection.State == ConnectionState.Closed) transaction.Connection.Open(); DataSet ds = ExecuteDataset((SQLiteCommand)cmd); return ds; } #region UpdateDataset /// <summary> /// Executes the respective command for each inserted, updated, or deleted row in the DataSet. /// </summary> /// <remarks> /// e.g.: /// UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order"); /// </remarks> /// <param name="insertCommand">A valid SQL statement to insert new records into the data source</param> /// <param name="deleteCommand">A valid SQL statement to delete records from the data source</param> /// <param name="updateCommand">A valid SQL statement used to update records in the data source</param> /// <param name="dataSet">The DataSet used to update the data source</param> /// <param name="tableName">The DataTable used to update the data source.</param> public static void UpdateDataset(SQLiteCommand insertCommand, SQLiteCommand deleteCommand, SQLiteCommand updateCommand, DataSet dataSet, string tableName) { if (insertCommand == null) throw new ArgumentNullException("insertCommand"); if (deleteCommand == null) throw new ArgumentNullException("deleteCommand"); if (updateCommand == null) throw new ArgumentNullException("updateCommand"); if (tableName == null || tableName.Length == 0) throw new ArgumentNullException("tableName"); // Create a SQLiteDataAdapter, and dispose of it after we are done using (SQLiteDataAdapter dataAdapter = new SQLiteDataAdapter()) { // Set the data adapter commands dataAdapter.UpdateCommand = updateCommand; dataAdapter.InsertCommand = insertCommand; dataAdapter.DeleteCommand = deleteCommand; // Update the dataset changes in the data source dataAdapter.Update(dataSet, tableName); // Commit all the changes made to the DataSet dataSet.AcceptChanges(); } } #endregion /// <summary> /// ShortCut method to return IDataReader /// NOTE: You should explicitly close the Command.connection you passed in as /// well as call Dispose on the Command after reader is closed. /// We do this because IDataReader has no underlying Connection Property. /// </summary> /// <param name="cmd">SQLiteCommand Object</param> /// <param name="commandText">SQL Statement with optional embedded "@param" style parameters</param> /// <param name="paramList">object[] array of parameter values</param> /// <returns>IDataReader</returns> public static IDataReader ExecuteReader(SQLiteCommand cmd, string commandText, object[] paramList) { if (cmd.Connection == null) throw new ArgumentException("Command must have live connection attached.", "cmd"); cmd.CommandText = commandText; AttachParameters(cmd,commandText, paramList); if (cmd.Connection.State == ConnectionState.Closed) cmd.Connection.Open(); IDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection); return rdr; } /// <summary> /// Shortcut to ExecuteNonQuery with SqlStatement and object[] param values /// </summary> /// <param name="connectionString">SQLite Connection String</param> /// <param name="commandText">Sql Statement with embedded "@param" style parameters</param> /// <param name="paramList">object[] array of parameter values</param> /// <returns></returns> public static int ExecuteNonQuery(string connectionString, string commandText, params object[] paramList) { SQLiteConnection cn = new SQLiteConnection(connectionString); SQLiteCommand cmd = cn.CreateCommand(); cmd.CommandText = commandText; AttachParameters(cmd,commandText, paramList); if (cn.State == ConnectionState.Closed) cn.Open(); int result = cmd.ExecuteNonQuery(); cmd.Dispose(); cn.Close(); return result; } public static int ExecuteNonQuery(SQLiteConnection cn, string commandText, params object[] paramList) { SQLiteCommand cmd = cn.CreateCommand(); cmd.CommandText = commandText; AttachParameters(cmd,commandText, paramList); if (cn.State == ConnectionState.Closed) cn.Open(); int result = cmd.ExecuteNonQuery(); cmd.Dispose(); cn.Close(); return result; } /// <summary> /// Executes non-query sql Statment with Transaction /// </summary> /// <param name="transaction">SQLiteTransaction. Transaction consists of Connection, Transaction, /// and Command, all of which must be created prior to making this method call. </param> /// <param name="commandText">Command text.</param> /// <param name="paramList">Param list.</param> /// <returns>Integer</returns> /// <remarks>user must examine Transaction Object and handle transaction.connection .Close, etc.</remarks> public static int ExecuteNonQuery(SQLiteTransaction transaction, string commandText, params object[] paramList) { if (transaction == null) throw new ArgumentNullException("transaction"); if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or committed, please provide an open transaction.", "transaction"); IDbCommand cmd = transaction.Connection.CreateCommand(); cmd.CommandText = commandText; AttachParameters((SQLiteCommand)cmd,cmd.CommandText, paramList); if (transaction.Connection.State == ConnectionState.Closed) transaction.Connection.Open(); int result = cmd.ExecuteNonQuery(); cmd.Dispose(); return result; } /// <summary> /// Executes the non query. /// </summary> /// <param name="cmd">CMD.</param> /// <returns></returns> public static int ExecuteNonQuery(IDbCommand cmd) { if (cmd.Connection.State == ConnectionState.Closed) cmd.Connection.Open(); int result = cmd.ExecuteNonQuery(); cmd.Connection.Close(); cmd.Dispose(); return result; } /// <summary> /// Shortcut to ExecuteScalar with Sql Statement embedded params and object[] param values /// </summary> /// <param name="connectionString">SQLite Connection String</param> /// <param name="commandText">SQL statment with embedded "@param" style parameters</param> /// <param name="paramList">object[] array of param values</param> /// <returns></returns> public static object ExecuteScalar(string connectionString, string commandText, params object[] paramList) { SQLiteConnection cn = new SQLiteConnection(connectionString); SQLiteCommand cmd = cn.CreateCommand(); cmd.CommandText = commandText; AttachParameters(cmd,commandText, paramList); if (cn.State == ConnectionState.Closed) cn.Open(); object result = cmd.ExecuteScalar(); cmd.Dispose(); cn.Close(); return result; } /// <summary> /// Execute XmlReader with complete Command /// </summary> /// <param name="command">SQLite Command</param> /// <returns>XmlReader</returns> public static XmlReader ExecuteXmlReader(IDbCommand command) { // open the connection if necessary, but make sure we // know to close it when we�re done. if (command.Connection.State != ConnectionState.Open) { command.Connection.Open(); } // get a data adapter SQLiteDataAdapter da = new SQLiteDataAdapter((SQLiteCommand)command); DataSet ds = new DataSet(); // fill the data set, and return the schema information da.MissingSchemaAction = MissingSchemaAction.AddWithKey; da.Fill(ds); // convert our dataset to XML StringReader stream = new StringReader(ds.GetXml()); command.Connection.Close(); // convert our stream of text to an XmlReader return new XmlTextReader(stream); } /// <summary> /// Parses parameter names from SQL Statement, assigns values from object array , /// and returns fully populated ParameterCollection. /// </summary> /// <param name="commandText">Sql Statement with "@param" style embedded parameters</param> /// <param name="paramList">object[] array of parameter values</param> /// <returns>SQLiteParameterCollection</returns> /// <remarks>Status experimental. Regex appears to be handling most issues. Note that parameter object array must be in same ///order as parameter names appear in SQL statement.</remarks> private static SQLiteParameterCollection AttachParameters(SQLiteCommand cmd, string commandText, params object[] paramList) { if (paramList == null || paramList.Length == 0) return null; SQLiteParameterCollection coll = cmd.Parameters; string parmString = commandText.Substring(commandText.IndexOf("@")); // pre-process the string so always at least 1 space after a comma. parmString = parmString.Replace(",", " ,"); // get the named parameters into a match collection string pattern = @"(@)\S*(.*?)\b"; Regex ex = new Regex(pattern, RegexOptions.IgnoreCase); MatchCollection mc = ex.Matches(parmString); string[] paramNames = new string[mc.Count]; int i = 0; foreach (Match m in mc) { paramNames[i] = m.Value; i++; } // now let's type the parameters int j = 0; Type t = null; foreach (object o in paramList) { t = o.GetType(); SQLiteParameter parm = new SQLiteParameter(); switch (t.ToString()) { case ("DBNull"): case ("Char"): case ("SByte"): case ("UInt16"): case ("UInt32"): case ("UInt64"): throw new SystemException("Invalid data type"); case ("System.String"): parm.DbType = DbType.String; parm.ParameterName = paramNames[j]; parm.Value = (string)paramList[j]; coll.Add(parm); break; case ("System.Byte[]"): parm.DbType = DbType.Binary; parm.ParameterName = paramNames[j]; parm.Value = (byte[])paramList[j]; coll.Add(parm); break; case ("System.Int32"): parm.DbType = DbType.Int32; parm.ParameterName = paramNames[j]; parm.Value = (int)paramList[j]; coll.Add(parm); break; case ("System.Boolean"): parm.DbType = DbType.Boolean; parm.ParameterName = paramNames[j]; parm.Value = (bool)paramList[j]; coll.Add(parm); break; case ("System.DateTime"): parm.DbType = DbType.DateTime; parm.ParameterName = paramNames[j]; parm.Value = Convert.ToDateTime(paramList[j]); coll.Add(parm); break; case ("System.Double"): parm.DbType = DbType.Double; parm.ParameterName = paramNames[j]; parm.Value = Convert.ToDouble(paramList[j]); coll.Add(parm); break; case ("System.Decimal"): parm.DbType = DbType.Decimal; parm.ParameterName = paramNames[j]; parm.Value = Convert.ToDecimal(paramList[j]); break; case ("System.Guid"): parm.DbType = DbType.Guid; parm.ParameterName = paramNames[j]; parm.Value = (System.Guid)(paramList[j]); break; case ("System.Object"): parm.DbType = DbType.Object; parm.ParameterName = paramNames[j]; parm.Value = paramList[j]; coll.Add(parm); break; default: throw new SystemException("Value is of unknown data type"); } // end switch j++; } return coll; } /// <summary> /// Executes non query typed params from a DataRow /// </summary> /// <param name="command">Command.</param> /// <param name="dataRow">Data row.</param> /// <returns>Integer result code</returns> public static int ExecuteNonQueryTypedParams(IDbCommand command, DataRow dataRow) { int retVal = 0; // If the row has values, the store procedure parameters must be initialized if (dataRow != null && dataRow.ItemArray.Length > 0) { // Set the parameters values AssignParameterValues(command.Parameters, dataRow); retVal = ExecuteNonQuery(command); } else { retVal = ExecuteNonQuery(command); } return retVal; } /// <summary> /// This method assigns dataRow column values to an IDataParameterCollection /// </summary> /// <param name="commandParameters">The IDataParameterCollection to be assigned values</param> /// <param name="dataRow">The dataRow used to hold the command's parameter values</param> /// <exception cref="System.InvalidOperationException">Thrown if any of the parameter names are invalid.</exception> protected internal static void AssignParameterValues(IDataParameterCollection commandParameters, DataRow dataRow) { if (commandParameters == null || dataRow == null) { // Do nothing if we get no data return; } DataColumnCollection columns = dataRow.Table.Columns; int i = 0; // Set the parameters values foreach (IDataParameter commandParameter in commandParameters) { // Check the parameter name if (commandParameter.ParameterName == null || commandParameter.ParameterName.Length <= 1) throw new InvalidOperationException(string.Format( "Please provide a valid parameter name on the parameter #{0}, the ParameterName property has the following value: '{1}'.", i, commandParameter.ParameterName)); if (columns.Contains(commandParameter.ParameterName)) commandParameter.Value = dataRow[commandParameter.ParameterName]; else if (columns.Contains(commandParameter.ParameterName.Substring(1))) commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)]; i++; } } /// <summary> /// This method assigns dataRow column values to an array of IDataParameters /// </summary> /// <param name="commandParameters">Array of IDataParameters to be assigned values</param> /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values</param> /// <exception cref="System.InvalidOperationException">Thrown if any of the parameter names are invalid.</exception> protected void AssignParameterValues(IDataParameter[] commandParameters, DataRow dataRow) { if ((commandParameters == null) || (dataRow == null)) { // Do nothing if we get no data return; } DataColumnCollection columns = dataRow.Table.Columns; int i = 0; // Set the parameters values foreach (IDataParameter commandParameter in commandParameters) { // Check the parameter name if (commandParameter.ParameterName == null || commandParameter.ParameterName.Length <= 1) throw new InvalidOperationException(string.Format( "Please provide a valid parameter name on the parameter #{0}, the ParameterName property has the following value: '{1}'.", i, commandParameter.ParameterName)); if (columns.Contains(commandParameter.ParameterName)) commandParameter.Value = dataRow[commandParameter.ParameterName]; else if (columns.Contains(commandParameter.ParameterName.Substring(1))) commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)]; i++; } } /// <summary> /// This method assigns an array of values to an array of IDataParameters /// </summary> /// <param name="commandParameters">Array of IDataParameters to be assigned values</param> /// <param name="parameterValues">Array of objects holding the values to be assigned</param> /// <exception cref="System.ArgumentException">Thrown if an incorrect number of parameters are passed.</exception> protected void AssignParameterValues(IDataParameter[] commandParameters, params object[] parameterValues) { if ((commandParameters == null) || (parameterValues == null)) { // Do nothing if we get no data return; } // We must have the same number of values as we pave parameters to put them in if (commandParameters.Length != parameterValues.Length) { throw new ArgumentException("Parameter count does not match Parameter Value count."); } // Iterate through the IDataParameters, assigning the values from the corresponding position in the // value array for (int i = 0, j = commandParameters.Length, k = 0; i < j; i++) { if (commandParameters[i].Direction != ParameterDirection.ReturnValue) { // If the current array value derives from IDataParameter, then assign its Value property if (parameterValues[k] is IDataParameter) { IDataParameter paramInstance; paramInstance = (IDataParameter)parameterValues[k]; if (paramInstance.Direction == ParameterDirection.ReturnValue) { paramInstance = (IDataParameter)parameterValues[++k]; } if (paramInstance.Value == null) { commandParameters[i].Value = DBNull.Value; } else { commandParameters[i].Value = paramInstance.Value; } } else if (parameterValues[k] == null) { commandParameters[i].Value = DBNull.Value; } else { commandParameters[i].Value = parameterValues[k]; } k++; } } } } }