也谈OleDbHelper,由SqlHelper类转OleDbHelper类，access操作-mysql教程-PHP中文网

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也谈OleDbHelper,由SqlHelper类转OleDbHelper类，access操作

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Jun 07, 2016 pm 03:05 PM

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);
}
}
}
}

使用方法跟SqlHelper类相似。

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