也谈OleDbHelper,由SqlHelper类转OleDbHelper类,access操作
今意外看见一贴子谈OleDbHelper,突然想起自已一直用的由SqlHelper类转成的OleDbHelper,在此分享,自己用了二年了,还没发现异常, 代码如下: using System; using System.Data; using System.Data.OleDb; using System.Configuration; using System.Colle
今意外看见一贴子谈OleDbHelper,突然想起自已一直用的由SqlHelper类转成的OleDbHelper,在此分享,自己用了二年了,还没发现异常, 代码如下:
- using System;
- using System.Data;
- using System.Data.OleDb;
- using System.Configuration;
- using System.Collections;
- using System.Data.Sql;
- using System.Text;
- namespace Lihui.Common
- {
-
///
- /// Summary description for OleDbHelper
- ///
- public class OleDbHelper
- {
- //Database connection strings
- public static readonly string CONN_STRING = ConfigurationManager.AppSettings["OleDbConnectionString"];
- public static readonly string CONN_STRING1 = ConfigurationManager.AppSettings["OleDbConnectionString1"];
- // Hashtable to store cached parameters
- private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
- #region =ExecuteNonQuery=
- public static int ExecuteNonQuery(string connString, CommandType cmdType, string cmdText)
- {
- return ExecuteNonQuery(connString, cmdType, cmdText, null);
- }
- public static int ExecuteNonQuery(OleDbConnection conn, CommandType cmdType, string cmdText)
- {
- return ExecuteNonQuery(conn, cmdType, cmdText, null);
- }
- public static int ExecuteNonQuery(OleDbTransaction trans, CommandType cmdType, string cmdText)
- {
- return ExecuteNonQuery(trans, cmdType, cmdText, null);
- }
- public static int ExecuteNonQuery(string connString, CommandType cmdType, string cmdText, params OleDbParameter[] cmdParms)
- {
- OleDbCommand cmd = new OleDbCommand();
- using (OleDbConnection conn = new OleDbConnection(connString))
- {
- PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
- int val = cmd.ExecuteNonQuery();
- //清除cmd的参数
- cmd.Parameters.Clear();
- if (conn.State == ConnectionState.Open)
- {
- conn.Close();
- }
- return val;
- }
- }
- public static int ExecuteNonQuery(OleDbConnection conn, CommandType cmdType, string cmdText, params OleDbParameter[] cmdParms)
- {
- OleDbCommand cmd = new OleDbCommand();
- PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
- int val = cmd.ExecuteNonQuery();
- cmd.Parameters.Clear();
- if (conn.State == ConnectionState.Open)
- {
- conn.Close();
- }
- return val;
- }
- public static int ExecuteNonQuery(OleDbTransaction trans, CommandType cmdType, string cmdText, params OleDbParameter[] cmdParms)
- {
- OleDbCommand cmd = new OleDbCommand();
- PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, cmdParms);
- int val = cmd.ExecuteNonQuery();
- cmd.Parameters.Clear();
- if (cmd.Connection.State == ConnectionState.Open)
- {
- cmd.Connection.Close();
- }
- return val;
- }
- #endregion
- #region =ExecuteReader=
- public static OleDbDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
- {
- //pass through the call providing null for the set of OleDbParameters
- return ExecuteReader(connectionString, commandType, commandText, (OleDbParameter[])null);
- }
- public static OleDbDataReader ExecuteReader(string connString, CommandType cmdType, string cmdText, params OleDbParameter[] cmdParms)
- {
- OleDbCommand cmd = new OleDbCommand();
- OleDbConnection conn = new OleDbConnection(connString);
- try
- {
- PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
- OleDbDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
- cmd.Parameters.Clear();
- if (conn.State == ConnectionState.Open)
- {
- conn.Close();
- }
- return rdr;
- }
- catch
- {
- conn.Close();
- throw;
- }
- }
- #endregion
- #region =ExecuteDataset=
- public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
- {
- return ExecuteDataset(connectionString, commandType, commandText, (OleDbParameter[])null);
- }
- public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params OleDbParameter[] commandParameters)
- {
- using (OleDbConnection cn = new OleDbConnection(connectionString))
- {
- cn.Open();
- //调用重载方法
- return ExecuteDataset(cn, commandType, commandText, commandParameters);
- }
- }
- public static DataSet ExecuteDataset(OleDbConnection connection, CommandType commandType, string commandText)
- {
- return ExecuteDataset(connection, commandType, commandText, (OleDbParameter[])null);
- }
- public static DataSet ExecuteDataset(OleDbConnection connection, CommandType commandType, string commandText, params OleDbParameter[] commandParameters)
- {
- //创建一个OleDbCommand对象,并对其进行初始化
- OleDbCommand cmd = new OleDbCommand();
- PrepareCommand(cmd, connection, (OleDbTransaction)null, commandType, commandText, commandParameters);
- //创建OleDbDataAdapter对象以及DataSet
- OleDbDataAdapter da = new OleDbDataAdapter(cmd);
- DataSet ds = new DataSet();
- //填充ds
- da.Fill(ds);
- // 清除cmd的参数集合
- cmd.Parameters.Clear();
- if (cmd.Connection.State == ConnectionState.Open)
- {
- cmd.Connection.Close();
- }
- //返回ds
- return ds;
- }
- #endregion
- #region =ExecuteDataTable=
- public static DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText)
- {
- return ExecuteDataTable(connectionString, commandType, commandText, (OleDbParameter[])null);
- }
- public static DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText, params OleDbParameter[] commandParameters)
- {
- using (OleDbConnection cn = new OleDbConnection(connectionString))
- {
- cn.Open();
- //调用重载方法
- return ExecuteDataTable(cn, commandType, commandText, commandParameters);
- }
- }
- public static DataTable ExecuteDataTable(OleDbConnection connection, CommandType commandType, string commandText)
- {
- return ExecuteDataTable(connection, commandType, commandText, (OleDbParameter[])null);
- }
- public static DataTable ExecuteDataTable(OleDbConnection connection, CommandType commandType, string commandText, params OleDbParameter[] commandParameters)
- {
- //创建一个OleDbCommand对象,并对其进行初始化
- OleDbCommand cmd = new OleDbCommand();
- PrepareCommand(cmd, connection, (OleDbTransaction)null, commandType, commandText, commandParameters);
- //创建OleDbDataAdapter对象以及DataSet
- OleDbDataAdapter da = new OleDbDataAdapter(cmd);
- DataSet ds = new DataSet();
- //填充ds
- da.Fill(ds);
- // 清除cmd的参数集合
- cmd.Parameters.Clear();
- if (cmd.Connection.State == ConnectionState.Open)
- {
- cmd.Connection.Close();
- }
- //返回ds
- return ds.Tables[0];
- }
- #endregion
- #region =ExecuteScalar=
- public static object ExecuteScalar(string connString, CommandType cmdType, string cmdText)
- {
- return ExecuteScalar(connString, cmdType, cmdText, null);
- }
- public static object ExecuteScalar(string connString, CommandType cmdType, string cmdText, params OleDbParameter[] cmdParms)
- {
- OleDbCommand cmd = new OleDbCommand();
- using (OleDbConnection conn = new OleDbConnection(connString))
- {
- PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
- object val = cmd.ExecuteScalar();
- cmd.Parameters.Clear();
- if (conn.State == ConnectionState.Open)
- {
- conn.Close();
- }
- return val;
- }
- }
- public static object ExecuteScalar(OleDbConnection conn, CommandType cmdType, string cmdText)
- {
- return ExecuteScalar(conn, cmdType, cmdText, null);
- }
- public static object ExecuteScalar(OleDbConnection conn, CommandType cmdType, string cmdText, params OleDbParameter[] cmdParms)
- {
- OleDbCommand cmd = new OleDbCommand();
- PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
- object val = cmd.ExecuteScalar();
- cmd.Parameters.Clear();
- if (conn.State == ConnectionState.Open)
- {
- conn.Close();
- }
- return val;
- }
- #endregion
- public static void CacheParameters(string cacheKey, params OleDbParameter[] cmdParms)
- {
- parmCache[cacheKey] = cmdParms;
- }
- 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
- clonedParms[i] = (OleDbParameter)((ICloneable)cachedParms[i]).Clone();
- return clonedParms;
- }
- public static void PrepareCommand(OleDbCommand cmd, OleDbConnection conn, OleDbTransaction trans, CommandType cmdType, 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 = cmdType;
- //添加cmd需要的存储过程参数
- if (cmdParms != null)
- {
- foreach (OleDbParameter parm in cmdParms)
- cmd.Parameters.Add(parm);
- }
- }
- }
- }

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