asp.net中如何用后台的代码修改SQL数据库某个表格的某一列数据

2024-12-07 17:13:22
推荐回答(4个)
回答1:

//修改用户密码
private void subbtn_Click(object sender, System.EventArgs e)
{
string usetxt=this.usertxt.Text;//用户名
string pass=this.passtxt.Text;//密码框
string cpass=this.cpasstxt.Text;//确认密码框

if(usetxt=="")
{
this.Response.Write("");

return;
}
if(pass != cpass)
{
this.Response.Write("");
return;
}
else
{
//获取Web.config中的连接字符串
string sqlConnString=ConfigurationSettings.AppSettings["SQLConnString"].ToString();
//孝含判连接数据库
SqlConnection conn=new SqlConnection(sqlConnString);
SqlCommand cm=new SqlCommand("proc_user_add",conn);//使用存储过程
cm.CommandType = CommandType.StoredProcedure;
cm.Parameters.Add("@pro_uname",usetxt);
cm.Parameters.Add("@pro_pass",FormsAuthentication.HashPasswordForStoringInConfigFile(pass,"MD5"));//MD5加密

conn.Open();
try
{
int resultrow=cm.ExecuteNonQuery(); //返回数据库被影响的行
conn.Close();
this.Response.Write("");

}
catch
{
conn.Close();
}
}
}

//proc_user_add的存储过程
CREATE PROCEDURE proc_user_add
(
@pro_uname varchar(50),
@pro_pass varchar(50)
)
AS

UPDATE online
SET
u_name=@pro_uname,
u_passwd=@pro_pass

WHERE
u_name=@pro_uname

Return
GO

回答2:

sql代码含樱如下
UPDATE T_CakeManage SET ImageUrl = 新值 WHERE ID = 需要修改好老盯的列友和的ID

回答3:

一个表没有主键不行吧

回答4:

ID要重复,你可以新增一列作唯一标识,不然你修改的时候还不改到其他行去。

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