Java Hibernate delayed loading and javahib.pdf Delay

Java Hibernate delayed loading and javahib.pdf Delay
Example data table: team (class), certificate (ID card), student (student)

Team. hbm. xml
<? 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>
<! --
Mapping file autogenerated by MyEclipse Persistence Tools
-->
<Hibernate-mapping>
<Class name = "edu. dgut. ke. model. Team" table = "TEAM"Lazy = "true"> <! -- Multiple-to-one delayed loading settings -->
<Id name = "id" type = "java. lang. String">
<Column name = "ID" length = "32"/>
<Generator class = "uuid. hex"/>
</Id>
<Property name = "teamname" type = "java. lang. String">
<Column name = "TEAMNAME" length = "32" not-null = "true" unique = "true"/>
</Property>
<Set name = "students" inverse = "true" cascade = "all"Lazy = "true"> <! -- One-to-many delayed loading settings -->
<Key>
<Column name = "TEAMID" length = "32" not-null = "true"/>
</Key>
<One-to-define class = "edu. dgut. ke. model. Student"/>
</Set>
</Class>
</Hibernate-mapping>

Certificate. hbm. xml
<? 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>
<! --
Mapping file autogenerated by MyEclipse Persistence Tools
-->
<Hibernate-mapping>
<Class name = "edu. dgut. ke. model. Certificate" table = "CERTIFICATE" Lazy = "true"> <! -- One-to-one delay loading settings -->

<Id name = "id" type = "java. lang. String">
<Column name = "ID" length = "32"/>
<Generator class = "uuid">

</Generator>
</Id>
<Property name = "describe" type = "java. lang. String">
<Column name = "'describe'" length = "50" not-null = "true"/>
</Property>
<One-to-one name = "student"
Class = "edu. dgut. ke. model. Student"
Constrained = "true"> <! -- One-to-one delay loading settings -->

</One-to-one>
</Class>
</Hibernate-mapping>

Student. hbm. xml
<? 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>
<! --
Mapping file autogenerated by MyEclipse Persistence Tools
-->
<Hibernate-mapping>
<Class name = "edu. dgut. ke. model. Student" table = "STUDENT"Lazy = "true">
<Id name = "id" type = "java. lang. String">
<Column name = "ID" length = "32"/>
<Generator class = "uuid. hex"/>
</Id>
<Certificate-to-one name = "certificate"
Class = "edu. dgut. ke. model. Certificate"
Unique = "true"
Column = "cardId"
Cascade = "all"
>
</Role-to-one>
<Role-to-one name = "team" class = "edu. dgut. ke. model. Team">
<Column name = "TEAMID" length = "32" not-null = "true"/>
</Role-to-one>
<Property name = "studentname" type = "java. lang. String">
<Column name = "STUDENTNAME" length = "16" not-null = "true" unique = "true"/>
</Property>
</Class>
</Hibernate-mapping>
Note: The delay loading of one-to-one relationships is slightly different from that of other relationships. Delayed-to-one loading is the class label in the configuration file
When lazy = "true" is set, lazy = "true" is set in the set label ". One-to-one does not only need
Set the tag to lazy = "true", and set constrained = "true" in the one-to-one tag ".
If constrained = "true" is not set, the default prefetch = "join" is used for one-to-one queries ").