【转载】C#操作Access通用类

声明:本文为转载,非原创，如有侵权，请告知，本人会尽快删除。

原文地址：http://www.oschina.net/code/snippet_4946_749

[1].[代码] C#操作Access通用类

?

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

using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Data.OleDb; using System.Collections; /// <summary> /// AcceHelper 的摘要说明 /// </summary> public static class AccessHelper {      //数据库连接字符串      public static readonly string conn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + HttpContext.Current.Request.PhysicalApplicationPath + System.Configuration.ConfigurationManager.ConnectionStrings[ "ConnectionString" ].ConnectionString;      // 用于缓存参数的HASH表      private static Hashtable parmCache = Hashtable.Synchronized( new Hashtable());      /// <summary>      ///  给定连接的数据库用假设参数执行一个sql命令（不返回数据集）      /// </summary>      /// <param name="connectionString">一个有效的连接字符串</param>      /// <param name="commandText">存储过程名称或者sql命令语句</param>      /// <param name="commandParameters">执行命令所用参数的集合</param>      /// <returns>执行命令所影响的行数</returns>      public static int ExecuteNonQuery( string connectionString, string cmdText, params OleDbParameter[] commandParameters)      {          OleDbCommand cmd = new OleDbCommand();          using (OleDbConnection conn = new OleDbConnection(connectionString))          {              PrepareCommand(cmd, conn, null , cmdText, commandParameters);              int val = cmd.ExecuteNonQuery();              cmd.Parameters.Clear();              return val;          }      }      /// <summary>      /// 用现有的数据库连接执行一个sql命令（不返回数据集）      /// </summary>      /// <remarks>      ///举例:       ///  int result = ExecuteNonQuery(connString, "PublishOrders", new OleDbParameter("@prodid", 24));      /// </remarks>      /// <param name="conn">一个现有的数据库连接</param>      /// <param name="commandText">存储过程名称或者sql命令语句</param>      /// <param name="commandParameters">执行命令所用参数的集合</param>      /// <returns>执行命令所影响的行数</returns>      public static int ExecuteNonQuery(OleDbConnection connection, string cmdText, params OleDbParameter[] commandParameters)      {          OleDbCommand cmd = new OleDbCommand();          PrepareCommand(cmd, connection, null , cmdText, commandParameters);          int val = cmd.ExecuteNonQuery();          cmd.Parameters.Clear();          return val;      }      /// <summary>      ///使用现有的SQL事务执行一个sql命令（不返回数据集）      /// </summary>      /// <remarks>      ///举例:       ///  int result = ExecuteNonQuery(trans, "PublishOrders", new OleDbParameter("@prodid", 24));      /// </remarks>      /// <param name="trans">一个现有的事务</param>      /// <param name="commandText">存储过程名称或者sql命令语句</param>      /// <param name="commandParameters">执行命令所用参数的集合</param>      /// <returns>执行命令所影响的行数</returns>      public static int ExecuteNonQuery(OleDbTransaction trans, string cmdText, params OleDbParameter[] commandParameters)      {          OleDbCommand cmd = new OleDbCommand();          PrepareCommand(cmd, trans.Connection, trans, cmdText, commandParameters);          int val = cmd.ExecuteNonQuery();          cmd.Parameters.Clear();          return val;      }      /// <summary>      /// 用执行的数据库连接执行一个返回数据集的sql命令      /// </summary>      /// <remarks>      /// 举例:       ///  OleDbDataReader r = ExecuteReader(connString, "PublishOrders", new OleDbParameter("@prodid", 24));      /// </remarks>      /// <param name="connectionString">一个有效的连接字符串</param>      /// <param name="commandText">存储过程名称或者sql命令语句</param>      /// <param name="commandParameters">执行命令所用参数的集合</param>      /// <returns>包含结果的读取器</returns>      public static OleDbDataReader ExecuteReader( string connectionString, string cmdText, params OleDbParameter[] commandParameters)      {          //创建一个SqlCommand对象          OleDbCommand cmd = new OleDbCommand();          //创建一个SqlConnection对象          OleDbConnection conn = new OleDbConnection(connectionString);          //在这里我们用一个try/catch结构执行sql文本命令/存储过程，因为如果这个方法产生一个异常我们要关闭连接，因为没有读取器存在，          //因此commandBehaviour.CloseConnection 就不会执行          try          {              //调用 PrepareCommand 方法，对 SqlCommand 对象设置参数              PrepareCommand(cmd, conn, null , cmdText, commandParameters);              //调用 SqlCommand  的 ExecuteReader 方法              OleDbDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);              //清除参数              cmd.Parameters.Clear();              return reader;          }          catch          {              //关闭连接，抛出异常              conn.Close();              throw ;          }      }      /// <summary>      /// 返回一个DataSet数据集      /// </summary>      /// <param name="connectionString">一个有效的连接字符串</param>      /// <param name="cmdText">存储过程名称或者sql命令语句</param>      /// <param name="commandParameters">执行命令所用参数的集合</param>      /// <returns>包含结果的数据集</returns>      public static DataSet ExecuteDataSet( string connectionString, string cmdText, params OleDbParameter[] commandParameters)      {          //创建一个SqlCommand对象，并对其进行初始化          OleDbCommand cmd = new OleDbCommand();          using (OleDbConnection conn = new OleDbConnection(connectionString))          {              PrepareCommand(cmd, conn, null , cmdText, commandParameters);              //创建SqlDataAdapter对象以及DataSet              OleDbDataAdapter da = new OleDbDataAdapter(cmd);              DataSet ds = new DataSet();              try              {                  //填充ds                  da.Fill(ds);                  // 清除cmd的参数集合                  cmd.Parameters.Clear();                  //返回ds                  return ds;              }              catch              {                  //关闭连接，抛出异常                  conn.Close();                  throw ;              }          }      }      /// <summary>      /// 用指定的数据库连接字符串执行一个命令并返回一个数据集的第一列      /// </summary>      /// <remarks>      ///例如:       ///  Object obj = ExecuteScalar(connString, "PublishOrders", new OleDbParameter("@prodid", 24));      /// </remarks>      ///<param name="connectionString">一个有效的连接字符串</param>      /// <param name="commandText">存储过程名称或者sql命令语句</param>      /// <param name="commandParameters">执行命令所用参数的集合</param>      /// <returns>用 Convert.To{Type}把类型转换为想要的 </returns>      public static object ExecuteScalar( string connectionString, string cmdText, params OleDbParameter[] commandParameters)      {          OleDbCommand cmd = new OleDbCommand();          using (OleDbConnection connection = new OleDbConnection(connectionString))          {              PrepareCommand(cmd, connection, null , cmdText, commandParameters);              object val = cmd.ExecuteScalar();              cmd.Parameters.Clear();              return val;          }      }      /// <summary>      /// 用指定的数据库连接执行一个命令并返回一个数据集的第一列      /// </summary>      /// <remarks>      /// 例如:       ///  Object obj = ExecuteScalar(connString, "PublishOrders", new OleDbParameter("@prodid", 24));      /// </remarks>      /// <param name="conn">一个存在的数据库连接</param>      /// <param name="commandText">存储过程名称或者sql命令语句</param>      /// <param name="commandParameters">执行命令所用参数的集合</param>      /// <returns>用 Convert.To{Type}把类型转换为想要的 </returns>      public static object ExecuteScalar(OleDbConnection connection, string cmdText, params OleDbParameter[] commandParameters)      {          OleDbCommand cmd = new OleDbCommand();          PrepareCommand(cmd, connection, null , cmdText, commandParameters);          object val = cmd.ExecuteScalar();          cmd.Parameters.Clear();          return val;      }      /// <summary>      /// 将参数集合添加到缓存      /// </summary>      /// <param name="cacheKey">添加到缓存的变量</param>      /// <param name="cmdParms">一个将要添加到缓存的sql参数集合</param>      public static void CacheParameters( string cacheKey, params OleDbParameter[] commandParameters)      {          parmCache[cacheKey] = commandParameters;      }      /// <summary>      /// 找回缓存参数集合      /// </summary>      /// <param name="cacheKey">用于找回参数的关键字</param>      /// <returns>缓存的参数集合</returns>      public static OleDbParameter[] GetCachedParameters( string cacheKey)      {          OleDbParameter[] cachedParms = (OleDbParameter[])parmCache[cacheKey];          if (cachedParms == null )              return null ;          OleDbParameter[] clonedParms = new OleDbParameter[cachedParms.Length];          for ( int i = 0, j = cachedParms.Length; i < j; i++)              clonedParms =(OleDbParameter[])((ICloneable)cachedParms).Clone();          return clonedParms;      }      /// <summary>      /// 准备执行一个命令      /// </summary>      /// <param name="cmd">sql命令</param>      /// <param name="conn">Sql连接</param>      /// <param name="trans">Sql事务</param>      /// <param name="cmdText">命令文本,例如：Select * from Products</param>      /// <param name="cmdParms">执行命令的参数</param>      private static void PrepareCommand(OleDbCommand cmd, OleDbConnection conn, OleDbTransaction trans, string cmdText, OleDbParameter[] cmdParms)      {          //判断连接的状态。如果是关闭状态，则打开          if (conn.State != ConnectionState.Open)              conn.Open();          //cmd属性赋值          cmd.Connection = conn;          cmd.CommandText = cmdText;          //是否需要用到事务处理          if (trans != null )              cmd.Transaction = trans;          cmd.CommandType = CommandType.Text;          //添加cmd需要的存储过程参数          if (cmdParms != null )          {              foreach (OleDbParameter parm in cmdParms)                  cmd.Parameters.Add(parm);          }      } }