C#连接操作MySQL数据库详细步骤 帮助类等（二次改进版）

 

 

 

 

最近准备写一个仓库管理的项目

　　客户要求使用C#编写MySQL存储数据

　　为了方便，整理了数据库操作的工具类

 

首先在项目App.config 文件下添加节点

<connectionStrings>
    <add name="constr" connectionString="server=localhost;port=3306;user id=root;password=pwd;database=数据库;"/>
  </connectionStrings>

例如：

 

 然后在项目引用中添加MySQL.DAL.dll  类库

 

 

 

 

vs版本低的可能找不到这个类库，，只有去网上下载，然后添加本地引用了

 

 

然后编写工具类：

 

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MySql.Data.MySqlClient;

/// <summary>
/// @author: 房上的猫
/// 
/// @博客地址: https://www.cnblogs.com/lsy131479/
/// </summary>

namespace ConsoleApp1
{
    public class MySQLDBHelp
    {
        public static string Constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;

        #region  建立MySql数据库连接
        /// <summary>
        /// 建立数据库连接.
        /// </summary>
        /// <returns>返回MySqlConnection对象</returns>
        public MySqlConnection getMySqlCon()
        {
            string M_str_sqlcon = Constr;// "server=localhost;port=3306;user id=root;password=root;database=car"; //根据自己的设置
            MySqlConnection myCon = new MySqlConnection(M_str_sqlcon);
            return myCon;
        }
        #endregion

        #region  执行MySqlCommand命令
        /// <summary>
        /// 执行MySqlCommand
        /// </summary>
        /// <param name="M_str_sqlstr">SQL语句</param>
        public void getMySqlCom(string M_str_sqlstr)
        {
            MySqlConnection mysqlcon = this.getMySqlCon();
            mysqlcon.Open();
            MySqlCommand mysqlcom = new MySqlCommand(M_str_sqlstr, mysqlcon);
            mysqlcom.ExecuteNonQuery();
            mysqlcom.Dispose();
            mysqlcon.Close();
            mysqlcon.Dispose();
        }
        #endregion

        #region  创建MySqlDataReader对象
        /// <summary>
        /// 创建一个MySqlDataReader对象
        /// </summary>
        /// <param name="M_str_sqlstr">SQL语句</param>
        /// <returns>返回MySqlDataReader对象</returns>
        public MySqlDataReader getMySqlRead(string M_str_sqlstr)
        {
            MySqlConnection mysqlcon = this.getMySqlCon();
            MySqlCommand mysqlcom = new MySqlCommand(M_str_sqlstr, mysqlcon);
            mysqlcon.Open();
            MySqlDataReader mysqlread = mysqlcom.ExecuteReader(CommandBehavior.CloseConnection);
            return mysqlread;
        }
        #endregion
    }
}

 

 

进行测试：

 class Program
    {
        static void Main(string[] args)
        {
            MySQLDBHelp help = new MySQLDBHelp();
        
            String sql = "select * from insertcar";
            MySqlDataReader dr = help.getmysqlread(sql);
            while (dr.Read())
            {
                Console.WriteLine(dr["tax"].ToString());
            }
    
            Console.Read();
        }
    }

结果：