target/classes/mybatis/system/UserRoleMapper.xml

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<?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.ruoyi.project.system.user.mapper.UserRoleMapper">

	<resultMap type="UserRole" id="UserRoleResult">
		<result property="userId"     column="user_id"      />
		<result property="roleId"     column="role_id"      />
	</resultMap>
	
	<select id="selectUserRoleByUserId" parameterType="Long" resultMap="UserRoleResult">
		select user_id, role_id from sys_user_role where user_id = #{userId}
	</select>

	<delete id="deleteUserRoleByUserId" parameterType="Long">
		delete from sys_user_role where user_id = #{userId}
	</delete>
	
	<select id="countUserRoleByRoleId" resultType="Integer">
	    select count(1) from sys_user_role where role_id = #{roleId}  
	</select>
	
	<delete id="deleteUserRole" parameterType="Long">
 		delete from sys_user_role where user_id in
 		<foreach collection="array" item="userId" open="(" separator="," close=")">
 			#{userId}
        </foreach> 
 	</delete>
	
	<insert id="batchUserRole">
		insert into sys_user_role(user_id, role_id) values
		<foreach item="item" index="index" collection="list" separator=",">
			(#{item.userId},#{item.roleId})
		</foreach>
	</insert>
	
	<delete id="deleteUserRoleInfo" parameterType="UserRole">
		delete from sys_user_role where user_id=#{userId} and role_id=#{roleId}
	</delete>
	
	<delete id="deleteUserRoleInfos">
	    delete from sys_user_role where role_id=#{roleId} and user_id in
 	    <foreach collection="userIds" item="userId" open="(" separator="," close=")">
 	        #{userId}
            </foreach> 
	</delete>
	
</mapper>