代码:using System;using System.Collections.Generic;using System.Linq;using System.Text;using MODEL;using MySql.Data.MySqlClient;using MySQLDriverCS;namespace DAL{public class Dal{public static int getUserInformation(UserInformation user){MySqlConnection con = new MySql.Data.MySqlClient.MySqlConnection("Database='salesmis';Data Source='localhost';User Id='root';Password='123456';charset='utf8'");con.Open();MySqlCommand cmd = new MySqlCommand();cmd.Connection = con;cmd.CommandText = "select count(*) from userlogin where username=@name and password=@pwd";cmd.Parameters.Add(new MySQLParameter("@name", user.getUserName()));cmd.Parameters.Add(new MySQLParameter("@pwd", user.getPassword()));String name = user.getUserName();string pwd = user.getPassword();int count = Convert.ToInt32(cmd.ExecuteScalar());return count;}}}注:本人采用三层架构模式来连接Mysql数据库,这是Dal层,这要是获取数据库salesmis中user的信息并提交给login函数处理。编译后,系统提示:“一个未处理的异常类型的MySql.Data.MySqlClient。 发生在MySql.Data.dll MySqlException”附加信息:只有MySqlParameter对象可以存储抛出”错误指向这几行代码:cmd.Parameters.Add(new MySQLParameter("@name", user.getUserName()));cmd.Parameters.Add(new MySQLParameter("@pwd", user.getPassword()))本人在此跪求各位英雄好汉帮忙解答一下,万分感谢
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cmd.CommandText = @"select count(*) from userlogin where username=?name and password=?pwd" ; cmd.Parameters.Add( new MySQLParameter( "?name" , MySqlDbType.VarChar)).Value=user.getUserName(); cmd.Parameters.Add( new MySQLParameter( "?pwd" , MySqlDbType.VarChar)).Value=user.getPassword(); |
你试试上面的代码
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