ASP连接数据库登录按钮

（1）在配置文件中加上以下代码：

<connectionStrings>
<add name="accessconn" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\film.mdb;"/>
<add name="sqlconn" connectionString="Data Source=localhost;Initial Catalog=db_ASPNET;Trusted_Connection=SSPI;"/>
</connectionStrings>

到这里就完成了第一步工作。

（2）在代码文件中引入节点文件命名空间

using System.Configuration;

（3）在按钮事件中编辑数据库连接代码

protected void Button1_Click(object sender, EventArgs e)//登录按钮事件代码,以access作为示例，SQL以此类推
{
string str1 = ConfigurationManager.ConnectionStrings["accessconn"].ConnectionString.ToString(); //读取configuration文件的节点
//string str2 = ConfigurationManager.ConnectionStrings["sqlconn"].ConnectionString.ToString();
OleDbConnection connstr1 = new OleDbConnection(str1); //数据库连接对象
//SqlConnection connstr2 = new SqlConnection(str2);
if (connstr1.State == System.Data.ConnectionState.Closed) //打开数据库
{
connstr1.Open();
}
string content = "select * from user_info where uname='"+username.Text+"'and upwd='"+userpwd.Text+"'"; //编写SQL语句
OleDbCommand commstr1 = new OleDbCommand(content, connstr1);//执行SQL语句
//SqlCommand commstr2 = new SqlCommand(content, connstr2);
OleDbDataReader dr = commstr1.ExecuteReader();//接受查询结果
// SqlDataReader dr= commstr2.ExecuteReader();
if (dr.Read())//判断查询结果dr是否有数据
{
// Response.Redirect("welcome.aspx");//跳转页面

Response.Write("<script>alert('成功登陆');location.href='welcome.aspx';</script>");
}
else
{
Response.Write("<script>alert('用户名或者密码错误！')</script>");
}
dr.Close();
if (connstr1.State == System.Data.ConnectionState.Open) //关闭数据库
{
connstr1.Close();
}
}