mysql存储过程及c#调用标准版

private string shuju_lianjie(string name, string email, string password)
        {
            //////////////////////////////////////////////////////////////////////////////
            ///获取用户名、邮件及设定密码，增加到数据库的用户表后返回该用户注册id值，不考虑 安全，仅仅表示代码的写作范例是否合乎要求
            ///存储过程为：
            ///CREATE PROCEDURE `yuan_user_cc`(in xname varchar(100),in xemail varchar(100),in xpassword varchar(100),out xid integer)
            ///begin
            ///insert into yuan_user(name,email,password) values(xname,xemail,xpassword);
            ///select id into xid from yuan_user where name=xname;
            ///end
            //////////////////////////////////////////////////////////////////////////////
            Int16 id;//返回的id值
            MySqlConnection mysqlcon;
            MySqlDataAdapter mysqldata = new MySqlDataAdapter();
            DataSet dataset = new DataSet();
            mysqlcon = new MySqlConnection("server=localhost; user id=root; password=123; database=yuan_test; pooling=false;charset=gb2312");
            mysqldata.SelectCommand = new MySqlCommand();
            mysqldata.SelectCommand.Connection = mysqlcon;
            mysqldata.SelectCommand.CommandText = "yuan_user_cc";
            mysqldata.SelectCommand.CommandType = CommandType.StoredProcedure;
            //设置参数，添加到数据库
            MySqlParameter name_parameter = new MySqlParameter("?xname", MySqlDbType.VarChar,100);//mysql的存储过程参数是以?打头的！！！！
            name_parameter.Value = name;
            mysqldata.SelectCommand.Parameters.Add(name_parameter);
            //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
            MySqlParameter email_parameter = new MySqlParameter("?xemail", MySqlDbType.VarChar, 100);//mysql的存储过程参数是以?打头的！！！！
            email_parameter.Value = email;
            mysqldata.SelectCommand.Parameters.Add(email_parameter);
            //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
            MySqlParameter password_parameter = new MySqlParameter("?xpassword", MySqlDbType.VarChar, 100);//mysql的存储过程参数是以?打头的！！！！
            password_parameter.Value = password;
            mysqldata.SelectCommand.Parameters.Add(password_parameter);
            //++++++++++++++++++++++++++返回值++++++++++++++++++++++++++++++++++++++++++
            MySqlParameter id_parameter = new MySqlParameter("?xid", MySqlDbType.Int16,15);//mysql的存储过程参数是以?打头的！！！！
            id_parameter.Direction=ParameterDirection.Output;
            mysqldata.SelectCommand.Parameters.Add(id_parameter);
            //+++++++++++++++++++++++++打开数据库，插入数据，返回id值+++++++++++++++++++
            try
            {
                mysqldata.Fill(dataset, "yuan_user_cc");

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