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
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;
}
}
//
}
//