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;

}

}//

}//

好了，数据库访问、数据库操作的公用类完成了，详细代码意义大家自己看吧，这些属于C# 语法知识了，现在可以编译生成项目了，编译完后把项目的dll文件Com.LXJ.dll拷贝到Example项目下的bin目录中，然后在项目Example中引入Com.LXJ.dll即可。