[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";
5             string constr = mysqlString;
6             MySqlConnection mycon = new MySqlConnection(constr);
7             return mycon;
8         }

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);
            }
        }