【IT168技术文档】

  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>

  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。稍后介绍如何使用它，休息一下，喝口水，呵呵.....