c#.net连接access操作类

1、配置web.config文件：配置数据库连接参数

<configuration>
<appSettings/>
<connectionStrings>

<add name="ConnectionString" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=F:/TeacherSystem/App_Data/db.mdb;Jet OLEDB:Database Password=123"
providerName="System.Data.OleDb" />
</connectionStrings

2
程序设计开始：

1、按要求建立Access数据库及数据表

2、编写数据库访问、操作的公用类，此类可以复用到以后开发的任何系统中

（1）、新建一个C# 类库项目， 命名为“Com.LXJ”，设置项目属性：程序集名称、默认命名空间均为“Com.LXJ”

（2）、在此项目目录下创建目录Database，新建C# 类文件ConnDbForAccess.cs 在Database目录下。

添加引用：System.Web.dll

（3）、编写ConnDbForAccess.cs 的代码


using System;


using System.Data;


using System.Data.OleDb;


using System.Web;


using System.Web.UI;


using System.Configuration;




namespace Com.LXJ.Database




...{




/**//// <summary>


/// conn 的摘要说明。


/// </summary>


public class ConnDbForAcccess




...{




/**//// <summary>


/// 连接数据库字符串


/// </summary>


private string connectionString;






/**//// <summary>


/// 存储数据库连接（保护类，只有由它派生的类才能访问）


/// </summary>


protected OleDbConnection Connection;






/**//// <summary>


/// 构造函数：数据库的默认连接


/// </summary>


public ConnDbForAcccess()




...{


string connStr;


connStr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString.ToString();


// connStr = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"].ToString(); //从web.config配置中读取


connectionString = connStr;


//connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + HttpContext.Current.Request.PhysicalApplicationPath + connStr;


// connectionString = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"].ToString();


//


Connection = new OleDbConnection(connectionString);


}






/**//// <summary>


/// 构造函数：带有参数的数据库连接


/// </summary>


/// <param name="newConnectionString"></param>


public ConnDbForAcccess(string newConnectionString)




...{


//connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + HttpContext.Current.Request.PhysicalApplicationPath + newConnectionString;


connectionString = newConnectionString;


Connection = new OleDbConnection(connectionString);


}






/**//// <summary>


/// 获得连接字符串


/// </summary>


public string ConnectionString




...{


get




...{


return connectionString;


}


}








/**//// <summary>


/// 执行SQL语句没有返回结果，如：执行删除、更新、插入等操作


/// </summary>


/// <param name="strSQL"></param>


/// <returns>操作成功标志</returns>


public bool ExeSQL(string strSQL)




...{


bool resultState = false;




Connection.Open();


OleDbTransaction myTrans = Connection.BeginTransaction();


OleDbCommand command = new OleDbCommand(strSQL, Connection, myTrans);




try




...{


command.ExecuteNonQuery();


myTrans.Commit();


resultState = true;


}


catch




...{


myTrans.Rollback();


resultState = false;


}


finally




...{


Connection.Close();


}


return resultState;


}






/**//// <summary>


/// 执行SQL语句返回结果到DataReader中


/// </summary>


/// <param name="strSQL"></param>


/// <returns>dataReader</returns>


private OleDbDataReader ReturnDataReader(string strSQL)




...{


Connection.Open();


OleDbCommand command = new OleDbCommand(strSQL, Connection);


OleDbDataReader dataReader = command.ExecuteReader();


Connection.Close();




return dataReader;


}






/**//// <summary>


/// 执行SQL语句返回结果到DataSet中


/// </summary>


/// <param name="strSQL"></param>


/// <returns>DataSet</returns>


public DataSet ReturnDataSet(string strSQL)




...{


Connection.Open();


DataSet dataSet = new DataSet();


OleDbDataAdapter OleDbDA = new OleDbDataAdapter(strSQL, Connection);


OleDbDA.Fill(dataSet, "objDataSet");




Connection.Close();


return dataSet;


}






/**//// <summary>


/// 执行一查询语句，同时返回查询结果数目


/// </summary>


/// <param name="strSQL"></param>


/// <returns>sqlResultCount</returns>


public int ReturnSqlResultCount(string strSQL)




...{


int sqlResultCount = 0;




try




...{


Connection.Open();


OleDbCommand command = new OleDbCommand(strSQL, Connection);


OleDbDataReader dataReader = command.ExecuteReader();




while (dataReader.Read())




...{


sqlResultCount++;


}


dataReader.Close();


}


catch




...{


sqlResultCount = 0;


}


finally




...{


Connection.Close();


}


return sqlResultCount;


}






}//


}//