mybatis 返回 对象中属性中包含List

1.实体

@Data
public class User {
    private Long userId;
    private String phone;
    private String username;
    private List roles;
}

2.resultMap

3.sql 语句

    SELECT a.user_id,a.phone,a.username,c.role as roles 
    FROM b_user a , b_user_role b , b_role c
    WHERE a.user_id = b.user_id AND b.role_id = c.role_id and a.phone = #{phone,jdbcType=VARCHAR}