Mybatis之解决collection一对多问题(显示的结果没有整合到一起)

先简单说一下我遇到的问题

我是两张表关联查询(其实是主表都全部数据,但是只保存其他表的ID),主表保存有附表的数据,但是需要将附表的数据整合到主表相同的目录下,方便前台调用。

需要的结果样式如下图1所示,但是获取到的结果总是分开的,resultMap和collection节点内容都对了好几遍,写的没问题,但是出现结果如图二所示:然后最总发现是主表的主键ID所导致的,因为主表ID每条都不一样,虽然在SQL中没查,但是编译器好像也会获取,按主键区分,所以不能直接使用原有的主键内容,组要手动设置一个,这个设置的内容是你需要划分的依据字段,如我是根据DIAGNOSIS_NO这个字段来划分数据哪些是一组的,所以用这个字段来代替主键id。

图一

{
    "code": 200,
    "msg": "成功获取",
    "data": [
        {
            "id": "",
            "nursingplanDtoList": [
                {
                    "id": "",
                    "DIAGNOSIS_NO": "38.0",
                    "FACTOR_NO": 24,
                    "DIAGNOSIS_FACTOR": "疼痛不适。"
                },
                {
                    "id": "",
                    "DIAGNOSIS_NO": "38.0",
                    "FACTOR_NO": 25,
                    "DIAGNOSIS_FACTOR": "活动无耐力。"
                },
            ],
            "PATIENT_ID": "20005369",
            "VISIT_ID": "1",
            "ADMISSION_DATE": "2020-09-22 10:20",
        }
    ]
}

图二

{
    "code": 200,
    "msg": "成功获取",
    "data": [
        {
            "id": "",
            "nursingplanDtoList": [
                {
                    "id": "",
                    "DIAGNOSIS_NO": "38.0",
                    "FACTOR_NO": 24,
                    "DIAGNOSIS_FACTOR": "疼痛不适。"
                }
            ],
            "PATIENT_ID": "20005369",
            "VISIT_ID": "1",
            "ADMISSION_DATE": "2020-09-22 10:20",
        },
        {
            "id": "",
            "nursingplanDtoList": [
                {
                    "id": "",
                    "DIAGNOSIS_NO": "38.0",
                    "FACTOR_NO": 25,
                    "DIAGNOSIS_FACTOR": "活动无耐力。"
                }
            ],
            "PATIENT_ID": "20005369",
            "VISIT_ID": "1",
            "ADMISSION_DATE": "2020-09-22 10:20",
        },
    ]
}

首先先看一下我的两张表

表一:factorDict

Mybatis之解决collection一对多问题(显示的结果没有整合到一起)_第1张图片

表二:nursingDiagnosis

Mybatis之解决collection一对多问题(显示的结果没有整合到一起)_第2张图片

Sql查询语句

        SELECT
        n.DIAGNOSIS_NO as id,
        n.PATIENT_ID,
        n.VISIT_ID,
        n.ADMISSION_DATE,
        n.DIAGNOSIS_NO,
        n.DIAGNOSIS_STATUS,
        n.DIAGNOSIS_SORT,
        n.EXPECTED_TARGET,
        n.START_DATE,
        n.STOP_DATE,
        n.FACTOR_ID as FACTOR_NO,
        n.FACTOR_STATUS,
        f.DIAGNOSIS_FACTOR
        FROM
        nursingDiagnosis n LEFT JOIN factorDcit f on n.FACTOR_ID=f.id
        WHERE
        n.PATIENT_ID = #{Patient_id}
        AND n.VISIT_ID = #{Visit_id}
        AND n.ADMISSION_DATE=#{Admission_Date}
        AND n.DIAGNOSIS_NO='38.0'
        ORDER BY
        n.DIAGNOSIS_STATUS DESC,
        n.DIAGNOSIS_SORT

总结

以上为个人经验,希望能给大家一个参考,也希望大家多多支持脚本之家。

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