C# 连接 Access 操作

C# 连接 Access 操作[转，整理]
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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;

        } 



    }//

}//