[C#]获取连接MySql数据库及常用的CRUD操作

测试如下：

首先添加引用：MySql.Data.dll

链接：http://pan.baidu.com/s/1dEQgLpf 密码：bnyu

*将链接数据库的信息放入配置文件中(app.config)

     <appSettings>
         <add key="mysql" value="server=127.0.0.1;User Id=******;password=******;Database="******"/>
     </appSettings>

*在程序启动时进行启动

   private string mysqlString = ConfigurationManager.AppSettings["mysql"].ToString();

①建立mysql数据库链接

         //建立mysql数据库链接
         public MySqlConnection getMySqlConn()
         {
             //string constr = "server=localhost;User Id=root;password=123456;Database=qqmusicdistinct";
             string constr = mysqlString;
             MySqlConnection mycon = new MySqlConnection(constr);
7             return mycon;
         }

②建立执行命令语句对象

         //建立执行命令语句对象
         public MySqlCommand getSqlCommand(String sql, MySqlConnection mysql)
         {
             MySqlCommand mySqlCommand = new MySqlCommand(sql, mysql);
             return mySqlCommand;
         }

③编写sql语句，对数据做相应处理

         //编写sql语句，对数据做相应处理
         public void setData()
         {
             MySqlConnection mysql = getMySqlConn();
             //查询sql
             String sqlSearch = "select * from student";
             //插入sql
             //String sqlInsert = "insert into student values (12,'张三',25,'大专')";
             //修改sql
             //String sqlUpdate = "update student set name='李四' where id= 3";
             //删除sql
             //String sqlDel = "delete from student where id = 12";

             //四种语句对象
             MySqlCommand mySqlCommand = getSqlCommand(sqlSearch, mysql);
             //MySqlCommand mySqlCommand = getSqlCommand(sqlInsert, mysql);
             //MySqlCommand mySqlCommand = getSqlCommand(sqlUpdate, mysql);
             //MySqlCommand mySqlCommand = getSqlCommand(sqlDel, mysql);

             mysql.Open();
 　　　　　　　
             getResultset(mySqlCommand);
             //getInsert(mySqlCommand);
             //getUpdate(mySqlCommand);
             //getDel(mySqlCommand);
             //记得关闭
             mysql.Close();
         }

④Ⅰ.查询并获得结果集并遍历

         //查询并获得结果集并遍历
         public void getResultset(MySqlCommand mySqlCommand)
         {
             MySqlDataReader reader = mySqlCommand.ExecuteReader();
             try
             {
                 while (reader.Read())
                 {
                     if (reader.HasRows)
                     {
                         //MessageBox.Show("歌曲名:" + reader.GetString(1) + "|歌手:" + reader.GetString(2));
                     }
                 }
             }
             catch (Exception)
             {
                 MessageBox.Show("查询失败了！");
             }
             finally
             {
                 reader.Close();
             }
         }

④Ⅱ.添加数据

         //添加数据
         public static void getInsert(MySqlCommand mySqlCommand)
         {
             try
             {
                 mySqlCommand.ExecuteNonQuery();
             }
             catch (Exception ex)
             {
                 String message = ex.Message;
                 Console.WriteLine("插入数据失败了！" + message);
             }

         }

④Ⅲ.修改数据

         //修改数据
         public static void getUpdate(MySqlCommand mySqlCommand)
         {
             try
             {
                 mySqlCommand.ExecuteNonQuery();
             }
             catch (Exception ex)
             {
                 String message = ex.Message;
                 Console.WriteLine("修改数据失败了！" + message);
             }
         }

④Ⅳ.删除数据

         //删除数据
         public static void getDel(MySqlCommand mySqlCommand)
         {
             try
             {
                 mySqlCommand.ExecuteNonQuery();
             }
             catch (Exception ex)
             {
                 String message = ex.Message;
                 Console.WriteLine("删除数据失败了！" + message);
             }
         }