hibernate复合主键查询主键不能为空的解决方案

来源：互联网发布：二维数组是什么意思编辑：程序博客网时间：2024/05/05 05:06

实体类：

public class SubStationLog  implements java.io.Serializable {private  Long substationid;private String markDate;        private String mark;//省去构造 set/get方法}

原配置：

<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping>    <class name="com.adam.dev.entity.SubStationLog" table="POB_SUBSTATION_LOG" schema="JMJL"><composite-id>            <key-property name="markDate" type="string">                <column name="MARK_DATE" length="20" />            </key-property>   <key-property name="substationid" type="long">                <column name="SUBSTATIONID" precision="10" scale="0" />            </key-property>        </composite-id>        <property name="mark" type="string">            <column name="MARK" length="10" />        </property>    </class></hibernate-mapping>

修改后配置：

<hibernate-mapping>    <class name="com.adam.dev.entity.SubStationLog" table="POB_SUBSTATION_LOG" schema="JMJL"><composite-id>    <key-property name="substationid" type="long">                <column name="SUBSTATIONID" precision="10" scale="0" />            </key-property>        </composite-id><property name="markDate" type="string" >                <column name="MARK_DATE" length="20" />         </property>        <property name="mark" type="string">            <column name="MARK" length="10" />        </property>    </class></hibernate-mapping>

显然是将联合主键中的markDate移到了<composite-id>标签对之外，这样便可以避免因为联合主键查询一查询条件为空，便不显示符合条件记录的情况。