id, user_id, department_id insert into t_user_department (id, user_id, department_id ) values (#{id,jdbcType=INTEGER}, #{userId,jdbcType=INTEGER}, #{departmentId,jdbcType=INTEGER} ) select from t_user_department where user_id = #{userId,jdbcType=INTEGER} select from t_user_department where department_id = #{departmentId,jdbcType=INTEGER} select from t_user_department where user_id=#{id} delete from t_user_department where user_id = #{userId} delete from t_user_department where department_id = #{departmentId} update t_user_department user_id = #{userId}, department_id = #{departmentId}, where id = #{id} SELECT tu.id, tu.real_name as 'value' FROM t_user tu INNER JOIN t_user_department tud ON tud.user_id = tu.id AND tud.department_id = #{depId}