mybtais 源码分析

一.最原始的使用jdbc连接mysql:

     maven依赖只要一个：

   <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.45</version>
    </dependency>

步骤：加载驱动（可以省略）—>获取连接对象—>创建预执行语句对象—>执行sql—>释放连接对象（口诀：贾琏欲执事）代码如下：

public class App 
{
    public static void main( String[] args )
    {
        Connection connection=null;
        try {
            //获取连接对象
            connection = DriverManager.getConnection("jdbc:mysql://192.168.50.117:23306/shop?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false", "shop", "shop");
            String sql="update  shop_order_attr set flg_type=? where cod_order_id=?";
            //获取预执行语句
            PreparedStatement preparedStatement = connection.prepareStatement(sql);

            preparedStatement.setInt(1,30);
            preparedStatement.setString(2,"666655555555");
            connection.setAutoCommit(false);
            //执行sql
            boolean execute = preparedStatement.execute();
            connection.commit();
            if (execute){
                System.out.println("成功");
            }
        } catch (Exception e) {
            try {
                connection.rollback();
            } catch (SQLException ex) {
                ex.printStackTrace();
            }

        }finally {
            if(connection!=null){
                try {
                    //释放连接对象
                    connection.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }

    }
}