Mybatis＜collection＞实现一对多

时隔多年又用到这样的查询方式了,提前声明一下分页最后返回的数据会小于每页条数，废话不多说直接上代码！

@Data
public class PbcUserTargetTaskPageVO {@ApiModelProperty("个人绩效指标id")private Long id;@ApiModelProperty("月份")private String month;@ApiModelProperty("工号")private String employeeNo;@ApiModelProperty("姓名")private String employeeName;@ApiModelProperty("月份")private String oraName;@ApiModelProperty(value = "目标")private BigDecimal goal;@ApiModelProperty(value = "绩效指标")private String targetName;@ApiModelProperty(value = "个人绩效指标关键任务")private List<PbcKeyTaskVO> taskList;
}

@Data
public class PbcKeyTaskVO {@ApiModelProperty(value = "主键id")private Long id;@ApiModelProperty(value = "任务编码")private String code;@ApiModelProperty(value = "任务名称")private String name;@ApiModelProperty(value = "任务类型")private String type;@ApiModelProperty(value = "任务描述")private String detail;@ApiModelProperty(value = "创建人工号")private String createBy;@ApiModelProperty(value = "创建人名字")private String createName;@ApiModelProperty(value = "创建时间")private String createTime;@ApiModelProperty(value = "是否关联绩效指标任务 Y=已关联，N=未关联")private String isRelated;
}

public interface PbcUserTargetTaskMapper extends BaseMapper<PbcUserTargetTask> {Page<PbcUserTargetTaskPageVO> pageList(Page page, PbcUserTargetTaskPageRequest dto);
}

    <!-- 通用查询映射结果 --><resultMap id="PageResultMap" type="com.shinho.plrs.manager.pojo.vo.PbcUserTargetTaskPageVO"><id column="user_target_id" property="id" /><result column="month" property="month" /><result column="employee_no" property="employeeNo" /><result column="employee_name" property="employeeName" /><result column="oraName" property="oraName" /><result column="goal" property="goal" /><result column="targetName" property="targetName" /><!-- 配置一对多关联 --><collection property="taskList" ofType="com.shinho.plrs.manager.pojo.vo.PbcKeyTaskVO"><id property="id" column="task_id"/><result property="code" column="task_code"/><result property="name" column="task_name"/><result property="type" column="task_type"/><result property="detail" column="task_detail"/><result property="createTime" column="task_create_time"/></collection></resultMap><select id="pageList" resultMap="PageResultMap">SELECTa.id AS user_target_id,a.`user_number` AS employee_no,a.`name` AS employee_name,a.`position` AS position,d.ora_name AS oraName,a.`target_code`,e.`name` AS targetName,a.`goal`,a.`version_date` AS `month`,b.task_id,c.`code` AS task_code,c.`name` AS task_name,c.type AS task_type,c.detail AS task_detail,c.create_time AS task_create_timeFROMuser_target_result aLEFT JOIN pbc_user_target_task b ON a.version_date=b.`month` AND a.user_number=b.employee_no AND a.target_code=b.target_codeLEFT JOIN pbc_key_task c ON b.task_id=c.idLEFT JOIN assess_base_snapshot d ON a.version_date=d.`month` AND a.user_number=d.employee_no AND a.position=d.assess_position_nameLEFT JOIN plrs_target e ON a.target_code=e.`code`WHEREa.version_date = '2024-07'AND a.user_number = '21120060'AND ( d.ora_id = '01003403' OR locate('01003403',d.ora_parent_group ) > 0)ORDER BY a.user_number DESC</select>