SqlHelper
SqlHelp1
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Web; 5 6 using System.Configuration; 7 using System.Data; 8 using System.Data.SqlClient; 9 using System.Web.UI.WebControls; 10 11 namespace _20160308 12 { 13 public class SqlHelper1 14 { 15 #region 连接字符串connStr 16 private static readonly string connStr = ConfigurationManager.ConnectionStrings["aspcourse"].ConnectionString; 17 #endregion 18 19 #region ExecuteNonQuery执行非查询语句--不是Select 而是Insert into, Delete where, Update where 20 /// <summary> 21 /// 执行非查询语句 22 /// </summary> 23 /// <param name="sql">要执行的Sql语句(也可能是存储过程的名字,目前还不知道那时撒东东)</param> 24 /// <param name="cmdType">要执行的类型(是存储过程还)是Sql语句[记得查下存储过程是什么鬼]</param> 25 /// <param name="param">要执行的Sql语句的数组,params是可选参数,0个或者多个.可选参数只能放在最后---语法规定,No Why!</param> 26 /// <returns>返回受影响的行数---也就是查询到的记录数嘛</returns> 27 public static int ExecuteNonQuery(string sql, CommandType cmdType, params SqlParameter[] param) 28 { 29 using(SqlConnection conn = new SqlConnection(connStr)) 30 { 31 conn.Open(); 32 using(SqlCommand cmd = new SqlCommand(sql, conn)) 33 { 34 cmd.CommandType = cmdType; 35 if (param != null && param.Length > 0) 36 { 37 cmd.Parameters.AddRange(param); 38 } 39 int Add_Rows = cmd.ExecuteNonQuery(); 40 cmd.Parameters.Clear();//清空SqlCommand的参数列表---看出来没,param是SqlCommand对象的. 41 return Add_Rows; 42 } 43 } 44 } 45 #endregion 46 47 #region ExecuteScalar执行查询语句---select 48 /// <summary> 49 /// 执行查询语句 50 /// </summary> 51 /// <param name="sql">要执行的Sql语句(也可能是存储过程的名字,目前还不知道那时撒东东)</param> 52 /// <param name="cmdType">要执行的类型(是存储过程还)是Sql语句[记得查下存储过程是什么鬼]</param> 53 /// <param name="param">要执行的Sql语句的数组,params是可选参数,0个或者多个.可选参数只能放在最后---语法规定,No Why!</param> 54 /// <returns>返回所查询的结果集的第一行第一列----注意是object类型(为撒不用泛型呢?-->记得改)</returns> 55 public static object ExecuteScalar(string sql, CommandType cmdType, params SqlParameter[] param) 56 { 57 using (SqlConnection conn = new SqlConnection(connStr)) 58 { 59 conn.Open(); 60 using (SqlCommand cmd = new SqlCommand(sql, conn)) 61 { 62 cmd.CommandType = cmdType; 63 if (param != null && param.Length > 0) 64 { 65 cmd.Parameters.AddRange(param); 66 } 67 68 cmd.Parameters.Clear();//清空SqlCommand的参数列表---看出来没,param是SqlCommand对象的. 69 return cmd.ExecuteScalar(); 70 } 71 } 72 } 73 #endregion 74 75 #region 读取ExecuteReader--要求一直连接着 76 /// <summary> 77 /// 读取DataReader 78 /// </summary> 79 /// <param name="sql">要执行的Sql语句(也可能是存储过程的名字,目前还不知道那时撒东东)</param> 80 /// <param name="cmdType">要执行的类型(是存储过程还)是Sql语句[记得查下存储过程是什么鬼]</param> 81 /// <param name="param">要执行的Sql语句的数组,params是可选参数,0个或者多个.可选参数只能放在最后---语法规定,No Why!</param> 82 /// <returns>返回SqlDataReader对象</returns> 83 public static SqlDataReader ExecuteReader(string sql, CommandType cmdType, params SqlParameter[] param) 84 { 85 //额,为什么不用using是吧,因为数据库要一直连着啊.---如果我没猜错的话. 86 SqlConnection conn = new SqlConnection(connStr); 87 SqlCommand cmd = new SqlCommand(sql, conn); 88 SqlDataReader dr = null; 89 try 90 { 91 conn.Open(); 92 if (conn.State != ConnectionState.Open) 93 throw new Exception(); 94 cmd.CommandType = cmdType; 95 if (param != null && param.Length > 0) 96 { 97 cmd.Parameters.AddRange(param); 98 } 99 100 dr = cmd.ExecuteReader(); 101 } 102 catch 103 { 104 //what should I do? 105 //可以什么都不做,哥直接抛给上层的catch--对否? 106 } 107 finally 108 { 109 cmd.Parameters.Clear();//清空SqlCommand的参数列表---看出来没,param是SqlCommand对象的. 110 } 111 return dr; 112 } 113 #endregion 114 115 #region 获得GetDataTable 116 /// <summary> 117 /// 获得DataTable 118 /// </summary> 119 /// <param name="sql">要执行的Sql语句(也可能是存储过程的名字,目前还不知道那时撒东东)</param> 120 /// <param name="cmdType">要执行的类型(是存储过程还)是Sql语句[记得查下存储过程是什么鬼]</param> 121 /// <param name="param">要执行的Sql语句的数组,params是可选参数,0个或者多个.可选参数只能放在最后---语法规定,No Why!</param> 122 /// <returns>返回DataTable数据表</returns> 123 public static DataTable GetDataTable(string sql, CommandType cmdType, params SqlParameter[] param) 124 { 125 using(SqlConnection conn = new SqlConnection(connStr)) 126 { 127 conn.Open(); 128 using(SqlCommand cmd = new SqlCommand(sql,conn)) 129 { 130 cmd.CommandType = cmdType; 131 if (param != null && param.Length > 0) 132 { 133 cmd.Parameters.AddRange(param); 134 } 135 SqlDataAdapter adapter = new SqlDataAdapter(cmd); 136 //就一张表,可以获得多张表吗? 137 DataTable tb = new DataTable(); 138 adapter.Fill(tb); 139 return tb; 140 } 141 } 142 } 143 #endregion 144 145 #region 获得GetDataSet 146 /// <summary> 147 /// 获得DataSet 148 /// </summary> 149 /// <param name="sql">要执行的Sql语句(也可能是存储过程的名字,目前还不知道那时撒东东)</param> 150 /// <param name="cmdType">要执行的类型(是存储过程还)是Sql语句[记得查下存储过程是什么鬼]</param> 151 /// <param name="param">要执行的Sql语句的数组,params是可选参数,0个或者多个.可选参数只能放在最后---语法规定,No Why!</param> 152 /// <returns>返回一个DataSet数据集</returns> 153 public static DataSet GetDataSet(string sql, CommandType cmdType, params SqlParameter[] param) 154 { 155 using (SqlConnection conn = new SqlConnection(connStr)) 156 { 157 conn.Open(); 158 using (SqlCommand cmd = new SqlCommand(sql, conn)) 159 { 160 cmd.CommandType = cmdType; 161 if (param != null && param.Length > 0) 162 { 163 cmd.Parameters.AddRange(param); 164 } 165 SqlDataAdapter adapter = new SqlDataAdapter(cmd); 166 DataSet ds = new DataSet(); 167 adapter.Fill(ds); 168 return ds; 169 } 170 } 171 } 172 #endregion 173 } 174 }
SqlHelp2
1 using System.Collections.Generic; 2 using System.Text; 3 using System.Data; 4 using System.Data.SqlClient; 5 using System.Collections; 6 using System.Configuration; 7 using System; 8 9 namespace ASP20170211 10 { 11 /// 此类为抽象类， 12 /// 不允许实例化，在应用时直接调用即可 13 /// </summary> 14 public abstract class SqlHelper 15 { 16 /// <summary> 17 /// 数据库连接字符串 18 /// </summary> 19 public static readonly string connectionString = ConfigurationManager.ConnectionStrings["sq_ruanmou"].ToString(); 20 // Hashtable to store cached parameters 21 private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable()); 22 23 #region//ExecteNonQuery方法 24 /// <summary> 25 ///执行一个不需要返回值的SqlCommand命令，通过指定专用的连接字符串。 26 /// 使用参数数组形式提供参数列表 27 /// </summary> 28 /// <param name="connectionString">一个有效的数据库连接字符串</param> 29 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param> 30 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param> 31 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 32 /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns> 33 public static int ExecteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) 34 { 35 SqlCommand cmd = new SqlCommand(); 36 using (SqlConnection conn = new SqlConnection(connectionString)) 37 { 38 //通过PrePareCommand方法将参数逐个加入到SqlCommand的参数集合中 39 PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters); 40 int val = cmd.ExecuteNonQuery(); 41 //清空SqlCommand中的参数列表 42 cmd.Parameters.Clear(); 43 return val; 44 } 45 } 46 47 /// <summary> 48 ///执行一个不需要返回值的SqlCommand命令，通过指定专用的连接字符串。 49 /// 使用参数数组形式提供参数列表 50 /// </summary> 51 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param> 52 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param> 53 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 54 /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns> 55 public static int ExecteNonQuery(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) 56 { 57 return ExecteNonQuery(connectionString ,cmdType, cmdText, commandParameters); 58 } 59 60 /// <summary> 61 ///存储过程专用 62 /// </summary> 63 /// <param name="cmdText">存储过程的名字</param> 64 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 65 /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns> 66 public static int ExecteNonQueryProducts(string cmdText, params SqlParameter[] commandParameters) 67 { 68 return ExecteNonQuery(CommandType.StoredProcedure, cmdText, commandParameters); 69 } 70 71 /// <summary> 72 ///Sql语句专用 73 /// </summary> 74 /// <param name="cmdText">T_Sql语句</param> 75 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 76 /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns> 77 public static int ExecteNonQueryText(string cmdText, params SqlParameter[] commandParameters) 78 { 79 return ExecteNonQuery(CommandType.Text, cmdText, commandParameters); 80 } 81 82 #endregion 83 #region//GetTable方法 84 85 /// <summary> 86 /// 执行一条返回结果集的SqlCommand，通过一个已经存在的数据库连接 87 /// 使用参数数组提供参数 88 /// </summary> 89 /// <param name="connecttionString">一个现有的数据库连接</param> 90 /// <param name="cmdTye">SqlCommand命令类型</param> 91 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param> 92 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 93 /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns> 94 public static DataTableCollection GetTable(string connecttionString, CommandType cmdTye, string cmdText, SqlParameter[] commandParameters) 95 { 96 SqlCommand cmd = new SqlCommand(); 97 DataSet ds = new DataSet(); 98 using (SqlConnection conn = new SqlConnection(connecttionString)) 99 { 100 PrepareCommand(cmd, conn, null, cmdTye, cmdText, commandParameters); 101 SqlDataAdapter adapter = new SqlDataAdapter(); 102 adapter.SelectCommand = cmd; 103 adapter.Fill(ds); 104 } 105 DataTableCollection table = ds.Tables; 106 return table; 107 } 108 109 /// <summary> 110 /// 执行一条返回结果集的SqlCommand，通过一个已经存在的数据库连接 111 /// 使用参数数组提供参数 112 /// </summary> 113 /// <param name="cmdTye">SqlCommand命令类型</param> 114 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param> 115 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 116 /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns> 117 public static DataTableCollection GetTable(CommandType cmdTye, string cmdText, SqlParameter[] commandParameters) 118 { 119 return GetTable(cmdTye, cmdText, commandParameters); 120 } 121 122 123 /// <summary> 124 /// 存储过程专用 125 /// </summary> 126 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param> 127 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 128 /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns> 129 public static DataTableCollection GetTableProducts(string cmdText, SqlParameter[] commandParameters) 130 { 131 return GetTable(CommandType.StoredProcedure, cmdText, commandParameters); 132 } 133 134 /// <summary> 135 /// Sql语句专用 136 /// </summary> 137 /// <param name="cmdText"> T-SQL 语句</param> 138 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 139 /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns> 140 public static DataTableCollection GetTableText(string cmdText, SqlParameter[] commandParameters) 141 { 142 return GetTable(CommandType.Text, cmdText, commandParameters); 143 } 144 #endregion 145 146 147 /// <summary> 148 /// 为执行命令准备参数 149 /// </summary> 150 /// <param name="cmd">SqlCommand 命令</param> 151 /// <param name="conn">已经存在的数据库连接</param> 152 /// <param name="trans">数据库事物处理</param> 153 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param> 154 /// <param name="cmdText">Command text，T-SQL语句 例如 Select * from Products</param> 155 /// <param name="cmdParms">返回带参数的命令</param> 156 private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms) 157 { 158 //判断数据库连接状态 159 if (conn.State != ConnectionState.Open) 160 conn.Open(); 161 cmd.Connection = conn; 162 cmd.CommandText = cmdText; 163 //判断是否需要事物处理 164 if (trans != null) 165 cmd.Transaction = trans; 166 cmd.CommandType = cmdType; 167 if (cmdParms != null) 168 { 169 foreach (SqlParameter parm in cmdParms) 170 if (parm != null) 171 { 172 cmd.Parameters.Add(parm); 173 } 174 } 175 } 176 177 /// <summary> 178 /// Execute a SqlCommand that returns a resultset against the database specified in the connection string 179 /// using the provided parameters. 180 /// </summary> 181 /// <param name="connectionString">一个有效的数据库连接字符串</param> 182 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param> 183 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param> 184 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 185 /// <returns>A SqlDataReader containing the results</returns> 186 public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) 187 { 188 SqlCommand cmd = new SqlCommand(); 189 SqlConnection conn = new SqlConnection(connectionString); 190 // we use a try/catch here because if the method throws an exception we want to 191 // close the connection throw code, because no datareader will exist, hence the 192 // commandBehaviour.CloseConnection will not work 193 try 194 { 195 PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters); 196 SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection); 197 cmd.Parameters.Clear(); 198 return rdr; 199 } 200 catch 201 { 202 conn.Close(); 203 throw; 204 } 205 } 206 #region//ExecuteDataSet方法 207 208 /// <summary> 209 /// return a dataset 210 /// </summary> 211 /// <param name="connectionString">一个有效的数据库连接字符串</param> 212 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param> 213 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param> 214 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 215 /// <returns>return a dataset</returns> 216 public static DataSet ExecuteDataSet(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) 217 { 218 SqlConnection conn = new SqlConnection(connectionString); 219 SqlCommand cmd = new SqlCommand(); 220 try 221 { 222 PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters); 223 SqlDataAdapter da = new SqlDataAdapter(); 224 DataSet ds = new DataSet(); 225 da.SelectCommand = cmd; 226 da.Fill(ds); 227 return ds; 228 } 229 catch 230 { 231 conn.Close(); 232 throw; 233 } 234 } 235 236 237 /// <summary> 238 /// 返回一个DataSet 239 /// </summary> 240 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param> 241 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param> 242 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 243 /// <returns>return a dataset</returns> 244 public static DataSet ExecuteDataSet(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) 245 { 246 return ExecuteDataSet(connectionString, cmdType, cmdText, commandParameters); 247 } 248 249 /// <summary> 250 /// 返回一个DataSet 251 /// </summary> 252 /// <param name="cmdText">存储过程的名字</param> 253 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 254 /// <returns>return a dataset</returns> 255 public static DataSet ExecuteDataSetProducts(string cmdText, params SqlParameter[] commandParameters) 256 { 257 return ExecuteDataSet(connectionString, CommandType.StoredProcedure, cmdText, commandParameters); 258 } 259 260 /// <summary> 261 /// 返回一个DataSet 262 /// </summary> 263 264 /// <param name="cmdText">T-SQL 语句</param> 265 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 266 /// <returns>return a dataset</returns> 267 public static DataSet ExecuteDataSetText(string cmdText, params SqlParameter[] commandParameters) 268 { 269 return ExecuteDataSet(connectionString, CommandType.Text, cmdText, commandParameters); 270 } 271 272 273 public static DataView ExecuteDataSet(string connectionString, string sortExpression, string direction, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) 274 { 275 SqlConnection conn = new SqlConnection(connectionString); 276 SqlCommand cmd = new SqlCommand(); 277 try 278 { 279 PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters); 280 SqlDataAdapter da = new SqlDataAdapter(); 281 DataSet ds = new DataSet(); 282 da.SelectCommand = cmd; 283 da.Fill(ds); 284 DataView dv = ds.Tables[0].DefaultView; 285 dv.Sort = sortExpression + " " + direction; 286 return dv; 287 } 288 catch 289 { 290 conn.Close(); 291 throw; 292 } 293 } 294 #endregion 295 296 297 #region // ExecuteScalar方法 298 /// <summary> 299 /// 返回第一行的第一列 300 /// </summary> 301 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param> 302 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param> 303 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 304 /// <returns>返回一个对象</returns> 305 public static object ExecuteScalar(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) 306 { 307 return ExecuteScalar(SqlHelper.connectionString, cmdType, cmdText, commandParameters); 308 } 309 310 /// <summary> 311 /// 返回第一行的第一列存储过程专用 312 /// </summary> 313 /// <param name="cmdText">存储过程的名字</param> 314 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 315 /// <returns>返回一个对象</returns> 316 public static object ExecuteScalarProducts(string cmdText, params SqlParameter[] commandParameters) 317 { 318 return ExecuteScalar(SqlHelper.connectionString, CommandType.StoredProcedure, cmdText, commandParameters); 319 } 320 321 /// <summary> 322 /// 返回第一行的第一列Sql语句专用 323 /// </summary> 324 /// <param name="cmdText">者 T-SQL 语句</param> 325 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 326 /// <returns>返回一个对象</returns> 327 public static object ExecuteScalarText(string cmdText, params SqlParameter[] commandParameters) 328 { 329 return ExecuteScalar(SqlHelper.connectionString, CommandType.Text, cmdText, commandParameters); 330 } 331 332 /// <summary> 333 /// Execute a SqlCommand that returns the first column of the first record against the database specified in the connection string 334 /// using the provided parameters. 335 /// </summary> 336 /// <remarks> 337 /// e.g.: 338 /// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24)); 339 /// </remarks> 340 /// <param name="connectionString">一个有效的数据库连接字符串</param> 341 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param> 342 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param> 343 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 344 /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns> 345 public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) 346 { 347 SqlCommand cmd = new SqlCommand(); 348 349 using (SqlConnection connection = new SqlConnection(connectionString)) 350 { 351 PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters); 352 object val = cmd.ExecuteScalar(); 353 cmd.Parameters.Clear(); 354 return val; 355 } 356 } 357 358 /// <summary> 359 /// Execute a SqlCommand that returns the first column of the first record against an existing database connection 360 /// using the provided parameters. 361 /// </summary> 362 /// <remarks> 363 /// e.g.: 364 /// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24)); 365 /// </remarks> 366 /// <param name="connectionString">一个有效的数据库连接字符串</param> 367 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param> 368 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param> 369 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param> 370 /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns> 371 public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) 372 { 373 SqlCommand cmd = new SqlCommand(); 374 PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters); 375 object val = cmd.ExecuteScalar(); 376 cmd.Parameters.Clear(); 377 return val; 378 } 379 380 #endregion 381 382 383 /// <summary> 384 /// add parameter array to the cache 385 /// </summary> 386 /// <param name="cacheKey">Key to the parameter cache</param> 387 /// <param name="cmdParms">an array of SqlParamters to be cached</param> 388 public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters) 389 { 390 parmCache[cacheKey] = commandParameters; 391 } 392 393 /// <summary> 394 /// Retrieve cached parameters 395 /// </summary> 396 /// <param name="cacheKey">key used to lookup parameters</param> 397 /// <returns>Cached SqlParamters array</returns> 398 public static SqlParameter[] GetCachedParameters(string cacheKey) 399 { 400 SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey]; 401 if (cachedParms == null) 402 return null; 403 SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length]; 404 for (int i = 0, j = cachedParms.Length; i < j; i++) 405 clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone(); 406 return clonedParms; 407 } 408 409 410 /// <summary> 411 /// 检查是否存在 412 /// </summary> 413 /// <param name="strSql">Sql语句</param> 414 /// <returns>bool结果</returns> 415 public static bool Exists(string strSql) 416 { 417 int cmdresult = Convert.ToInt32(ExecuteScalar(connectionString, CommandType.Text, strSql, null)); 418 if (cmdresult == 0) 419 { 420 return false; 421 } 422 else 423 { 424 return true; 425 } 426 } 427 428 /// <summary> 429 /// 检查是否存在 430 /// </summary> 431 /// <param name="strSql">Sql语句</param> 432 /// <param name="cmdParms">参数</param> 433 /// <returns>bool结果</returns> 434 public static bool Exists(string strSql, params SqlParameter[] cmdParms) 435 { 436 int cmdresult = Convert.ToInt32(ExecuteScalar(connectionString, CommandType.Text, strSql, cmdParms)); 437 if (cmdresult == 0) 438 { 439 return false; 440 } 441 else 442 { 443 return true; 444 } 445 } 446 } 447 448 }
