hibernate复合主键查询主键不能为空的解决方案
2013-04-24 09:38
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实体类:
[java]
view plaincopy
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:
[html]
view plaincopy
<?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:
[html]
view plaincopy
<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。
[java]
view plaincopy
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:
[html]
view plaincopy
<?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:
[html]
view plaincopy
<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。
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