mybatis 多表配置
阿新 • • 發佈:2020-07-17
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.itheima.mapper.OrderMapper"> <resultMap id="orderMap" type="order"> <!--手動指定欄位與實體屬性的對映關係 column: 資料表的欄位名稱 property:實體的屬性名稱--> <id column="oid" property="id"></id> <result column="ordertime" property="ordertime"></result> <result column="total" property="total"></result> <!--<result column="uid" property="user.id"></result> <result column="username" property="user.username"></result> <result column="password" property="user.password"></result> <result column="birthday" property="user.birthday"></result>--> <!-- property: 當前實體(order)中的屬性名稱(private User user) javaType: 當前實體(order)中的屬性的型別(User) --> <association property="user" javaType="user"> <id column="uid" property="id"></id> <result column="username" property="username"></result> <result column="password" property="password"></result> <result column="birthday" property="birthday"></result> </association> </resultMap> <select id="findAll" resultMap="orderMap"> SELECT*,o.id oid FROM orders o,USER u WHERE o.uid=u.id </select> </mapper>
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.itheima.mapper.UserMapper"> <resultMap id="userMap" type="user"> <id column="uid" property="id"></id> <result column="username" property="username"></result> <result column="password" property="password"></result> <result column="birthday" property="birthday"></result> <!--配置集合資訊 property:集合名稱 ofType:當前集合中的資料型別 --> <collection property="orderList" ofType="order"> <!--封裝order的資料--> <id column="oid" property="id"></id> <result column="ordertime" property="ordertime"></result> <result column="total" property="total"></result> </collection> </resultMap> <select id="findAll" resultMap="userMap"> SELECT *,o.id oid FROM USER u,orders o WHERE u.id=o.uid </select> <!--#############################################################################--> <resultMap id="userRoleMap" type="user"> <!--user的資訊--> <id column="userId" property="id"></id> <result column="username" property="username"></result> <result column="password" property="password"></result> <result column="birthday" property="birthday"></result> <!--user內部的roleList資訊--> <collection property="roleList" ofType="role"> <id column="roleId" property="id"></id> <result column="roleName" property="roleName"></result> <result column="roleDesc" property="roleDesc"></result> </collection> </resultMap> <select id="findUserAndRoleAll" resultMap="userRoleMap"> SELECT * FROM USER u,sys_user_role ur,sys_role r WHERE u.id=ur.userId AND ur.roleId=r.id </select> </mapper>