Data Association mappings for hibernate

Data Association mapping is divided into: one-to-many, many-to-a, single-to-many.

Cascade Property
• save-update : cascade operation when saving and modifying is performed
• delete : Cascade operations when performing a delete
• all cascade operations in all cases
• none : Do not cascade operations (default)

Crawl strategy

One-to-many, many-to-

one-to-many, multi-pair persistence class design//User Class Public classUser {Private intID;PrivateString name;Private intAge ;PrivateSet<address>AddressSet; //Get Set Method}//Address class Public classAddress {Private intID;PrivateString address;Private intTel;Privateuser User; //Get Set Method}

Address.hbm.xml<hibernate-mapping Package= "Com.hussion.pojo">     <classname= "Address"Table= "T_address">         <IDname= "id">           <Generatorclass= "Native"/>         </ID>         < Propertyname= "Address"></ Property>         < Propertyname= "Tel"></ Property>         <Many-to-onename= "User"class= "User"column= "userid"/>     </class> </hibernate-mapping>

User.hbm.xml<hibernate-mapping Package= "Com.hussion.pojo">      <classname= "User"Table= "T_user">         <IDname= "id"column= "id">           <Generatorclass= "Native"></Generator>         </ID>         < Propertyname= "Name"column= "Name"></ Property>         < Propertyname= "Age"column= "Age"></ Property>         <!--inverse= "true" discards relationship maintenance -         <Setname= "AddressSet"Inverse= "true">           <Keycolumn= "userid"/>           <One-to-manyclass= "Address"/>         </Set>     </class>  </hibernate-mapping>

One

Persistence class Design Public classPerson {Private intID;PrivateString UserName;PrivateCard Card; //Get Set Method}  Public classCard {Private intID;PrivateString Cardnum;Privateperson person ; //Get Set Method}

Person.hbm.xml<hibernate-mapping Package= "Com.hussion.pojo">     <classname= "Person"Table= "T_person">         <IDname= "id">           <Generatorclass= "Native"></Generator>         </ID>          < Propertyname= "UserName"></ Property>           <one-to-onename= "card"class= "Card"Cascade= "Delete"/>    </class> </hibernate-mapping>

Many-to-many

UblicclassTeacher {Private intID;PrivateString name;PrivateSet<student>student; //Get Set Method}  Public classStudent {Private intID;PrivateString name;PrivateSet<teacher>teacher; //Get Set Method}

Teacher.hbm.xml<hibernate-mapping Package= "Com.hussion.pojo">     <classname= "Teacher"Table= "T_teacher">         <IDname= "id"column= "id">           <Generatorclass= "Native"></Generator>         </ID>           < Propertyname= "Name"></ Property>         <Setname= "Student"Table= "T_student_techer">           <Keycolumn= "Teacherid"/>           <Many-to-manyclass= "Student"column= "StudentID"/></set>     </class> </hibernate-mapping>

Student.hbm.xml<hibernate-mapping Package= "Com.hussion.pojo">     <classname= "Student"Table= "T_student">         <IDname= "id"column= "id">           <Generatorclass= "Native"></Generator>         </ID>         < Propertyname= "Name"></ Property>         <Setname= "Teacher"Table= "T_student_techer">             <Keycolumn= "StudentID"/>             <Many-to-manyclass= "Teacher"column= "Teacherid/>         </Set>     </class> </hibernate-mapping>

Many-to-many side to abandon relationship maintenance<Setname= "Student"Table= "T_teacher_student"Inverse= "true">Sort<Many-to-manyclass= "Student"column= "s_id"order-by= "ID asc,name desc"></Many-to-many>

Delayed load shutdown: lazy= "false"