SQL：mapper中常用方法

1. resultMap 中定义实体类的名称

方法名	方法	参数	返回值
分页查询	findByPage	实体类对象	List
根据ID查询	findById	实体类对象	实体类对象
查询全部	find	实体类对象	List
插入	insert	Cart	-
删除	delete	实体类对象	-
更新	update	实体类对象	-
更新全部	updateAll	-	-
统计	count	实体类对象	int

    
        
    

    
    
        SELECT s.*  FROM
        sc_cart s
        where 1=1
        and s.userId = #{param.userId}
        and s.rentType = #{param.rentType}
        
            and s.selected = #{param.selected}
        
        ORDER BY id desc
    

    
    
        SELECT s.* FROM
        sc_cart s
        where  s.id = #{id}
    

    
        SELECT s.* FROM
        sc_cart s
        WHERE  1 = 1
        and s.goodsId = #{goodsId}
        and s.userId = #{userId}
    
    
        SELECT count(*) FROM sc_cart s where s.userId = #{userId}
    
    
        INSERT INTO sc_cart(
        goodsId,
        num,
        money,
        userId,
        goodsName,
        goodsImg,
        state,
        createTime,
        firstWeekPrice,
        subsequentPrice,
        rentType
        ) VALUES (
        #{goodsId},
        #{num},
        #{money},
        #{userId},
        #{goodsName},
        #{goodsImg},
        #{state},
        now(),
        #{firstWeekPrice},
        #{subsequentPrice},
         #{rentType}
        )
    
    
        delete from sc_cart where 1=1
        
        and id = #{id} and userId=#{userId}
         
        
            and goodsId = #{goodsId}  AND userId=#{userId}
        

    
    
        UPDATE sc_cart s set s.selected =  #{selected} where s.id = #{id}
    
    
         UPDATE sc_cart s set s.selected =  #{selected}   WHERE s.userId = #{userId}
    
    
        SELECT s.*, c.attchentUrl img,a.goodsType goodsType,a.goodsSubType goodsSubType, b.userId agencyUserId,b.account agencyAccount,b.agencyName  FROM
        sc_cart s
        LEFT JOIN cxy_attachment c on s.goodsId = c.goodsId  and  c.goodType=1 and attchentName='small1'
        LEFT JOIN sc_goods a on s.goodsId=a.id
        LEFT JOIN sc_service_info b on a.userId=b.userId
        where s.id in
        
            #{item}
        
        and s.userId = #{userId}  order by s.id desc