MyEclipse generating Hibernate entity classes from database backwards

This is divided into two operations: database operations and MYECLIPSE operations

Relational mappings are: Single bidirectional 1-n, N-1, N-n.

Mapping relationships are determined by table relationships in the database

Of course, you can work with just one table.

Single bidirectional 1-n, n-1 by two tables

Single bidirectional n-n consists of three tables, where the third table joins another two tables

The following is the creation of n-n myeclipse to reverse-generate hibernate entity classes from a database:

Database operations:

CREATE TABLE: Person_inf

Address_inf

Person_address

The relationship is: person_address create foreign key

It is important to note that the primary keys of the two tables, Person_inf and Address_inf, are identified as self-increment

MyEclipse Operation:

1. Create a new WEB project item

2. Create a new DB database connection:

Window->show view->other-> Search db

Right-click Space new to create a new DB database connection:

Finish finished

3. Right-click on the project name->myeclipse->add Hibernate capab ....

Next

Next

Next

Finish finished

4. Automatically generate entity classes:

Open DB Database connection

Locate the database name point, locate the dbo point, and find the table point-------Select tables right-click->hibernate Reverse Engineering.

Click Browse

Check

Next step

Next step

Click Person_inf and Address_inf two tables to select the value in the ID Generator:native

Click Finish to complete

Generated as follows:

5. Modify part of the code

(1). Mappings add AddressInf.hbm.xml and PersonInf.hbm.xml in Hibernate.cfg.xml

(2). Add cascade= "All" Cascade in the set label in AddressInf.hbm.xml and PersonInf.hbm.xml two configurations respectively

(3). Put the code in the Personinf.java:

Code in the Save () method

Switch

1      Public voidSave (Personinf transientinstance) {2Log.debug ("Saving Personinf instance");3         Try {4Transaction t=getsession (). BeginTransaction ();5 getsession (). Save (transientinstance);6 t.commit ();7Log.debug ("Save Successful");8}Catch(RuntimeException re) {9Log.error ("Save Failed", re);Ten             Throwre; One         } A}

You can then use the index.jsp call again.

The 6.index.jsp call uses the

Click, click Add to add a Tomcat server

Ok

Run the project running Tomcat server

Finally get:

MyEclipse generating Hibernate entity classes from database backwards