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  • mybatis中如何将多个表的查询结果,放入结果集中返回

    1、首先需要将resultMap进行改造,为了避免对其他sql的影响建议另外定义一个resultMapExtral,避免id相同,

    2、然后在resultMapExtral中添加其它表的字段,若多个表中的字段名相同,要对查询结果和resultMapExtral中相同的字段另起别名,

    3、最后另外定义一个实体bean接收结果。相当于重新定义一个包含所有返回字段的entity,而不能用原先单表的entity。(RccpWorkerCenterCapacityEntityExtral)

    4、也可以直接返回JsonObject对象,不用返回entity,这样就不需要用resultMap了,更简单一些。

    定义结果集:

    <resultMap id="BaseResultMapExtral"
            type="com.cybertron.service.rccp.entity.RccpWorkerCenterCapacityEntityExtral">
            <id column="workcenter_capacity_id" jdbcType="INTEGER"
                property="workercenterCapacityId" />        
            <result column="process_number" jdbcType="INTEGER" property="processNumber" />
            <result column="product_name" jdbcType="VARCHAR" property="productName" />
            <result column="product_id" jdbcType="INTEGER" property="productId" />
            <result column="average_volume" jdbcType="INTEGER" property="averageVolume" />
            <result column="single_process_time" jdbcType="DOUBLE"
                property="singleProcessTime" />
            <result column="change_model_time" jdbcType="DOUBLE" property="changeModelTime" />
            <result column="product_prepare_time" jdbcType="DOUBLE"
                property="productPrepareTime" />
            <result column="take_down_time" jdbcType="DOUBLE" property="takeDownTime" />
            <result column="unit_transport_size" jdbcType="DOUBLE"
                property="unitTransportSize" />
            <result column="s_resource_id" jdbcType="NUMERIC" property="sResourceId" />
            <result column="ad_wf_node_id" jdbcType="NUMERIC" property="adWfNodeId" />
            <result column="name" jdbcType="VARCHAR" property="workcenterName" />
            <result column="create_time" jdbcType="TIMESTAMP" property="createTime" />
            <result column="create_user" jdbcType="VARCHAR" property="createUser" />
            <result column="modify_time" jdbcType="TIMESTAMP" property="modifyTime" />
            <result column="modify_user" jdbcType="VARCHAR" property="modifyUser" />
            <result column="isdelete" jdbcType="BOOLEAN" property="isdelete" />
            <result column="isdefault" jdbcType="BOOLEAN" property="checkDefault" />
            <result column="is_key_wc" jdbcType="BOOLEAN" property="isKeyWc" />
            <result column="parent_product_id" jdbcType="NUMERIC" property="paproductId" />
              <result column="parentProductName" jdbcType="VARCHAR" property="parentProductName" />
            <result column="adWfNodeName" jdbcType="VARCHAR" property="adWfNodeName" />
        </resultMap>

    sql查询语句:

    <select id="queryAll" resultMap="BaseResultMapExtral">
        select 
         rwc.* ,mp.name parentProductName,awn.name adWfNodeName
        from rccp_workcenter_capacity rwc,m_product mp,ad_wf_node awn
        where mp.m_product_id=rwc.parent_product_id and  awn.ad_wf_node_id=rwc.ad_wf_node_id
        </select>
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  • 原文地址:https://www.cnblogs.com/panchanggui/p/10875430.html
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