mapper.xml

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INSERT INTO user (username,sex,birthday,address)VALUE (#{username},#{sex},#{birthday},#{address}) 

SELECT * FROM user WHERE id = #{id} 




SELECT u.* FROM user u WHERE u.id = #{user.id} 




SELECT u.* FROM user u WHERE username LIKE '%${username}%' AND sex = #{sex} 










SELECT COUNT(*) FROM user WHERE sex = #{user.sex} 





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SELECTid id_,username username_,sex sex_,birthday birthday_,address address_FROM user WHERE id = #{id} 





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sex = #{user.sex} 

and username LIKE '%${user.username}%' 

and address LIKE '%${user.address}%' 






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/*性别和名字*/ SELECT * FROM user 

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SELECT * FROM user 

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${id} 











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SELECT * FROM user 

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${id} 











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SELECTu.id,u.username,u.address,o.id order_id,o.number,o.createtime,o.note,od.id detail_id,od.items_id,od.items_num,it.name,it.price,it.detailFROMuser u,orders o,orderdetail od,items itWHEREo.user_id = u.idAND o.id = od.orders_idAND od.items_id = it.id 

pojo类，查询条件是综合的查询条件，不仅包括用户查询条件还包括其它的查询条件（比如将用户购买商品信息也作为查询条件），这时可以使用包装对象传递输入参数。