使用inner join查询同一张表，将一张表中的父菜单和子菜单关联起来

• mybatis代码

        
        
        
        
        
            
            
            
            
        
    


    
        select m.menu_id as pmenu_id ,m.parent_id as pparent_id
        ,m.menu_name as pmenu_name,m.menu_url as pmenu_url
        ,mm.menu_id as smenu_id, mm.parent_id as sparent_id ,mm.menu_name as smenu_name,mm.menu_url as smenu_url
        from menu m
        left join menu mm on m.menu_id=mm.parent_id
        where m.parent_id=0
    

• 执行sql语句如下

  
  
  image.png

• java的model层

public class Menu {
    private Long menuId;

    private Long parentId;

    private String menuName;

    private String menuUrl;

    private String status;

    private List sonMenu;

}