基於mybatis一對多查詢內層排序的問題

Posted on by

mybatis一對多查詢內層排序

<!--根據板塊id查詢所有主題->指標->維度-->
    <resultMap id="TitleDimensionMap" type="com.etouch.admincenter.bean.ZhmdDiagnosisTitleBean">
        <id column="title_id" property="id"/>
        <result column="title_name" property="titleName"/>
        <collection property="diagnosisKpiBeanList" ofType="com.etouch.admincenter.bean.ZhmdDiagnosisKpiBean">
            <id column="kpi_id" property="id"/>
            <result column="kpi_name" property="kpiName"/>
            <result column="kpi_type" property="kpiType"/>
            <result column="calculate_method" property="calculateMethod"/>
            <result column="is_add_description" property="isAddDescription"/>
            <result column="description_remind" property="descriptionRemind"/>
            <result column="input_description" property="inputDescription"/>
            <result column="kpi_industry_standard" property="kpiIndustryStandard"/>
            <result column="kpi_brand_standard" property="kpiBrandStandard"/>
            <result column="kpi_industry_standard_diff" property="kpiIndustryStandardDiff"/>
            <result column="kpi_brand_standard_diff" property="kpiBrandStandardDiff"/>
            <result column="input_description" property="inputDescription"/>
            <result column="kpi_description" property="kpiDescription"/>
            <collection property="dimensionBeans" ofType="com.etouch.admincenter.bean.ZhmdDiagnosisKpiDimensionBean">
                <id column="kpi_dimension_id" property="id"/>
                <result column="diagnosis_id" property="diagnosisId"/>
                <result column="dimension_name" property="dimensionName"/>
                <result column="dimension_value" property="dimensionValue"/>
            </collection>
        </collection>
    </resultMap>

可設置多個排序規則,這樣展示到前端頁面時,解決每次打開頁面顯示順序都不一樣的問題

<select id="getDimensionOneStep" resultMap="TitleDimensionMap">
     select
    zdt.id as title_id,zdt.title_name,
    zdk.id as kpi_id,zdk.kpi_name,zdk.kpi_type,zdk.calculate_method,zdk.is_add_description,zdk.description_remind,zdk.kpi_description,
    zdkd.id as kpi_dimension_id, zdkd.dimension_name,zdd.dimension_value,
    zdkpd.input_description
    from zhmd_diagnosis_title zdt
    left join zhmd_diagnosis_kpi zdk on zdk.diagnosis_title_id = zdt.id
    left join zhmd_diagnosis_kpi_dimension zdkd on zdkd.diagnosis_kpi_id = zdk.id
    left join zhmd_dimension_diagnosis zdd on  zdd.dimension_id = zdkd.id and zdd.diagnosis_id = #{diagnosisId}
    left join zhmd_diagnosis_kpi_problem_desc zdkpd on zdkpd.kpi_id = zdk.id and zdkpd.diagnosis_id =#{diagnosisId}
    where zdt.diagnosis_model_id = #{modelId}
    order by zdt.create_date desc,zdk.create_date desc,zdkd.dimension_sort asc
</select>

postman查詢結果

mybatis多排序問題

在很多業務場景中，會有多排序問題，mybatis支持多排序，寫法如下：

ORDER BY contract.contractCount DESC, reward.rewardTotal DESC, new_job.newJobCount DESC

這種寫法是根據最左邊的字段進行第一排序，如果第一排序字段有並列的，則根據第二字段再去排一次，依次類推。

以上為個人經驗，希望能給大傢一個參考，也希望大傢多多支持WalkonNet。

推薦閱讀：