Defining Dialect in Hibernate
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property> <property name="connection.username">root</property> <property name="connection.password">pass</property> <!-- JDBC connection pool (use the built-in) --> <property name="connection.pool_size">1</property> <!-- SQL dialect --> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <!-- Disable the second-level cache --> <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> <!-- Drop and re-create the database schema on startup --> <property name="hbm2ddl.auto">update</property> <!-- Name of the Annotated Entity class --> <mapping class="com.mugil.dto.UserDetails"/> </session-factory> </hibernate-configuration>
If hbm2ddl.auto is set to create the table will be created every time when java class is Run.The old records will be deleted.
<property name="hbm2ddl.auto">create</property>
When set to update the records will be added without new table creation
<property name="hbm2ddl.auto">update</property>
More Annotations
@Transient tells not to create Column
@Column tells the Hibernate the Name under which column need to be
created in Db table.
@Transient @Column (name="User_Name") private String userName;
@Temporal tells the option of selective addition.Below I am adding Date rather than
Date & time as Timestamp
@Temporal (TemporalType.DATE) private Date DOJ;
@Lob – Large Object, Telling Hibernate to create Large Object Datatype fro Column
@Lob over String creates CLOB
@Lob over Byte creates BLOB
@Lob private String userDescription;