MyBatis-Plus未集成SQL语句的场景与解决方案

<!-- XML 映射文件示例 -->
<select id="selectUserWithRole" resultType="map">
    SELECT u.*, r.role_name 
    FROM user u 
    LEFT JOIN user_role ur ON u.id = ur.user_id
    LEFT JOIN role r ON ur.role_id = r.id
    WHERE u.status = 1
</select>

@Mapper
public interface UserMapper extends BaseMapper<User> {
    List<Map<String, Object>> selectUserWithRole();
}

<select id="callCalculateStats" statementType="CALLABLE">
    {call calculate_user_stats(#{userId, mode=IN})}
</select>

@Select("{call calculate_user_stats(#{userId})}")
void callCalculateStats(@Param("userId") Long userId);

<sql id="baseColumn">
    id, name, create_time
</sql>
 
<select id="selectCustom" resultType="User">
    SELECT <include refid="baseColumn"/>
    FROM user WHERE ${ew.customSqlSegment}
</select>

<insert id="insertBatch" parameterType="java.util.List">
    INSERT INTO user (name, age) VALUES 
    <foreach collection="list" item="item" separator=",">
        (#{item.name}, #{item.age})
    </foreach>
</insert>

<select id="selectJsonData" resultType="map">
    SELECT id, info->>'$.address' AS address 
    FROM user WHERE info @> '{"status":1}'
</select>

@Results({
    @Result(property = "id", column = "user_id"),
    @Result(property = "details", column = "user_id",
            many = @Many(select = "selectUserDetails"))
})
@Select("SELECT id AS user_id FROM user WHERE id = #{id}")
User selectUserWithDetails(Long id);