Struts + hibernate Template Development notes-design mode: Dao

Using the data access object (DAO), we can split the underlying data access logic from the business logic. We constructed a DAO class that provides grud (create, read, update, and delete) operations for each data source.

The following is a DaO instance for data source grud (Creation) operations.

1. Interface (demodao. Java)

Package COM. company. demo. dao; import net. SF. hibernate. hibernateexception; import COM. company. demo. JDO. demo; import COM. company. demo. datamodule. *;/*** <p> title: STRUTS + hibernate development template </P> * <p> Description: general development template </P> * <p> copyright: copyright (c) 2003 </P> * <p> company: advantageous technologies </P> * @ author section Hong jie * @ version 1.0 */public interface demodao {/** Set Data Model **/Public void setdatamodule (datamodule ); /** create object **/Public void createdemo (Demo demo) throws hibernateexception, exception ;}

2. Abstract Factory (demodaofactory. Java)

Package COM. company. demo. dao;/*** <p> title: STRUTS + hibernate development template </P> * <p> Description: general development template </P> * <p> copyright: copyright (c) 2003 </P> * <p> company: advantageous technologies </P> * @ author Duan Hong jie * @ version 1.0 */public class demodaofactory {private demodaofactory () {} public final static demodao getdemodao () {return New demodaoimpl ();}}

3. DAO class (demodaoimpl. Java)

Package COM. company. demo. dao; import Java. util. list; import COM. company. demo. datamodule. *; import COM. company. demo. JDO. demo; import net. SF. hibernate. sessionfactory; import net. SF. hibernate. hibernateexception; import net. SF. hibernate. session; import net. SF. hibernate. transaction; import net. SF. hibernate. query;/*** <p> title: STRUTS + hibernate development template </P> * <p> Description: general development template </P> * <p> copyright: copyright (c) 20 03 </P> * <p> company: advantageous technologies </P> * @ author section Hong jie * @ version 1.0 */public class demodaoimpl implements demodao {private sessionfactory; private datamodule;/*** set the data model * @ Param datamodule */Public void setdatamodule (datamodule) {This. datamodule = datamodule; this. sessionfactory = datamodule. getsessionfactory ();}/*** create demo * @ Param demo * @ throws hibernateexception * @ throws Java. lang. Exception */Public void createdemo (Demo demo) throws hibernateexception, exception {transaction = NULL; Session session = sessionfactory. opensession (); try {transaction = session. begintransaction (); Session. save (DEMO); transaction. commit ();} catch (hibernateexception he) {If (transaction! = NULL) {transaction. rollback () ;}throw he ;}finally {session. Close ();}}}