java - How to create Objects in database if does not exists with JPA? -

i have web application use jpa / hibernate want know how hibernate can generate non-existent tables entities. persistence file follows:

what can add property ?

<persistence xmlns="http://java.sun.com/xml/ns/persistence"     xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"     xsi:schemalocation="http://java.sun.com/xml/ns/persistence          http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"     version="1.0">     <persistence-unit name="bankingapp">         <provider> org.hibernate.ejb.hibernatepersistence</provider>         <properties>              <property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.oracledriver"/>             <property name="hibernate.connection.url" value="jdbc:oracle:thin:@localhost:1521:xe"/>             <property name="hibernate.connection.username" value="user"/>             <property name="hibernate.connection.password" value="password"/>             <property name="hibernate.dialect" value="org.hibernate.dialect.oracle10gdialect"/>          </properties>     </persistence-unit> </persistence> 

you can add property

<property name="hibernate.hbm2ddl.auto" value="update"/>  

the possible values property are:

• validate: validates schema
• update: update schema
• create: create schema, override previous data
• create-drop: create schema , drop schema @ end of session