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c# - 使用CSharp三层架构MVC将数据插入mysql数据库（MysqlParameter插入空值）

问题描述

大家好，我的cities表有 4 列cityId是“AUTO_INCREMENT”，，，，cityName是governate表的conId外键引用countries

它们是用于将数据插入此表的存储过程last_insert_id()

CREATE DEFINER=`root`@`localhost` PROCEDURE `addCity`(in  cityNamee varchar(45),bGovernate varchar(45),cconId int(5),out ccityId int(5))BEGIN insert into cities(`cityName`,`governate`,`conId`)values (@cityNamee,@bGovernate,@cconId);set @ccityId=last_insert_id();END

sp 是从业务层（控制器）调用的，并将 throw 传递给模型，然后执行这里的过程是模型传递给 insert、update、delete 的命令

public void Transfare(string _chanPoro, MySqlParameter[] _dataContainer)
    {
        MySqlCommand transmeter = new MySqlCommand
        {
            CommandType = CommandType.StoredProcedure,
            CommandText = _chanPoro,
            Connection = dbcon
        };

        transmeter.Parameters.AddRange(_dataContainer);
        connect();
        transmeter.ExecuteNonQuery();
        disConnect();
    }

我尝试使用插入数据，MySqlParameter 但它总是失败并给我一个错误

 public static void insertCity(string cityName, string governate, int countryId)
    {
        try
        {
                _socket = new _ctrlChannel();

                MySqlParameter[] zair = new MySqlParameter[4];


                zair[0] = new MySqlParameter("@cityNamee", MySqlDbType.VarChar, 45)
                { Value = cityName, Direction = ParameterDirection.Input
                };

                zair[1] = new MySqlParameter("@bGovernate", MySqlDbType.VarChar)
                { Value = governate, Direction = ParameterDirection.Input
                };

                zair[2] = new MySqlParameter("@cconId", MySqlDbType.VarChar)
                { Value = countryId, Direction = ParameterDirection.Input
                };

                zair[3] = new MySqlParameter("@ccityId", MySqlDbType.Int32,5)
                {  Direction = ParameterDirection.Output
                };

                _socket.connect();
                _socket.Transfare("addCity", zair);
                _socket.disConnect();
        }
        catch (MySql.Data.MySqlClient.MySqlException we) { MessageBox.Show("error" + we); }
    }

cityName未在集合中找到

我尝试使用这种方法插入数据的传统方式，这里的主要问题是将空值插入数据库（不起作用），而表设计不支持

  public static void insertNewCity(string cityName, string governate, int countryId)
    {
        try
        {
            _socket = new _ctrlChannel();

            _ctrlChannel.InitializeDb();
            MySqlCommand cmd = new MySqlCommand();
            cmd.Connection = _ctrlChannel.dbcon;
            cmd.CommandText = "addCity";
            cmd.CommandType = CommandType.StoredProcedure;

            cmd.Parameters.AddWithValue("@cityNamee", cityName);
            cmd.Parameters["@cityNamee"].Direction = ParameterDirection.Input;

            cmd.Parameters.AddWithValue("@bGovernate", governate);
            cmd.Parameters["@bGovernate"].Direction = ParameterDirection.Input;

            cmd.Parameters.AddWithValue("@cconId", countryId);
            cmd.Parameters["@cconId"].Direction = ParameterDirection.Input;

            cmd.Parameters.AddWithValue("@ccityId", MySqlDbType.Int32);
            cmd.Parameters["@ccityId"].Direction = ParameterDirection.Output;
            _socket.connect();

            cmd.ExecuteNonQuery();

            _socket.disConnect();
        }
        catch (MySql.Data.MySqlClient.MySqlException we) { MessageBox.Show("error" + we); }
    }

注意：当我在服务器上测试它时，该程序是完整的

就这些了 非常感谢...

标签： c#mysqlmodel-view-controller

解决方案

确保有 getter 和 setter 将视图中的值保存到业务层，然后业务层交付以dataAccessLayer将其插入数据库

    string _cityName;
    string _governate;
    int _countryId;
    private string cityName { get; set; }
    private string governate { get; set; }
    private int countryId { get; set; }

    public void prepare()
    {
        _cityName = cityName;
        _governate = governate;
        _countryId = countryId;
    }
    public  void insertCity( string _cityName ,string _governate, int _countryId)
    {
        try
        {
                _socket = new _ctrlChannel();

                MySqlParameter[] zair = new MySqlParameter[4];


                zair[0] = new MySqlParameter("@cityNamee", MySqlDbType.VarChar, 45)
                { Value = _cityName, Direction = ParameterDirection.Input
                };

                zair[1] = new MySqlParameter("@bGovernate", MySqlDbType.VarChar)
                { Value = _governate, Direction = ParameterDirection.Input
                };

                zair[2] = new MySqlParameter("@cconId", MySqlDbType.VarChar)
                { Value = _countryId, Direction = ParameterDirection.Input
                };

                zair[3] = new MySqlParameter("@ccityId", MySqlDbType.Int32,5)
                {  Direction = ParameterDirection.Output,Value=DBNull.Value
                };

            _socket.connect();
            _socket.Transfare("addCity", zair);
            _socket.disConnect();
        }
        catch (MySql.Data.MySqlClient.MySqlException we) { MessageBox.Show("error" + we); }
    }

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