Does Hibernate create tables in the database automatically

Question

Upon reading this  archived  tutorial  they have not mentioned anything over creating tables in the DB  Does the Hibernate handle it automatically by creating tables and fields once i specify them  Here is my beans configuration   lt  xml version  quot 1 0 quot  encoding  quot UTF-8 quot   gt   lt beans xmlns  quot http   www springframework org schema beans quot      xmlns xsi  quot http   www w3 org 2001 XMLSchema-instance quot      xmlns p  quot http   www springframework org schema p quot      xsi schemaLocation  quot http   www springframework org schema beans http   www springframework org schema beans spring-beans xsd quot  gt        lt bean id  quot viewResolver quot  class  quot org springframework web servlet view InternalResourceViewResolver quot  p prefix  quot  WEB-INF jsp  quot  p suffix  quot  jsp quot    gt            lt bean id  quot myDataSource quot  class  quot org apache commons dbcp BasicDataSource quot  destroy-method  quot close quot  gt           lt property name  quot driverClassName quot  value  quot com mysql jdbc Driver quot   gt           lt property name  quot url quot  value  quot jdbc mysql   127 0 0 1 3306 spring quot   gt           lt property name  quot username quot  value  quot monwwty quot   gt           lt property name  quot password quot  value  quot www quot   gt       lt  bean gt            lt bean id  quot mySessionFactory quot  class  quot org springframework orm hibernate3 annotation AnnotationSessionFactoryBean quot  gt           lt property name  quot dataSource quot  ref  quot myDataSource quot    gt           lt property name  quot annotatedClasses quot  gt               lt list gt                   lt value gt uk co vinoth spring domain User lt  value gt               lt  list gt           lt  property gt           lt property name  quot hibernateProperties quot  gt               lt props gt                   lt prop key  quot hibernate dialect quot  gt org hibernate dialect MySQLDialect lt  prop gt                   lt prop key  quot hibernate show sql quot  gt true lt  prop gt                   lt prop key  quot hibernate hbm2ddl auto quot  gt create lt  prop gt               lt  props gt           lt  property gt       lt  bean gt            lt bean id  quot myUserDAO quot  class  quot uk co vinoth spring dao UserDAOImpl quot  gt           lt property name  quot sessionFactory quot  ref  quot mySessionFactory quot   gt       lt  bean gt            lt bean name  quot  user   htm quot  class  quot uk co vinoth spring web UserController quot   gt           lt property name  quot userDAO quot  ref  quot myUserDAO quot    gt       lt  bean gt        lt  beans gt

User · Answer

add following property in your hibernate.cfg.xml file

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

BTW, in your Entity class, you must define your @Id filed like this:

@Id
@GeneratedValue(generator = "increment")
@GenericGenerator(name = "increment", strategy = "increment")
@Column(name = "id")
private long id;

if you use the following definition, it maybe not work:

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
private long id;

User · Answer

Yes it does in your case because of the below property in your config  This is ok during testing but in production you need to disable this    lt prop key  hibernate hbm2ddl auto  gt create lt  prop gt

User · Answer

For me it wasn t working even with hibernate hbm2ddl auto set to update  It turned out that the generated creation SQL was invalid  because one of my column names  user  was an SQL keyword  This failed softly  and it wasn t obvious what was going on until I inspected the logs

User · Answer

If property hibernate ddl-auto   update  then it will not create the tables automatically  To create tables automatically  you need to set the property to hibernate ddl-auto   create  The list of option which is used in the spring boot are   validate  validate the schema  makes no changes to the database  update  update the schema   create  creates the schema  destroying previous data   create-drop  drop the schema at the end of the session none  is all other cases   So for the first time you can set it to create and then next time on-wards you should set it to update

User · Answer

Yes  Hibernate can be configured by way of the hibernate hbm2ddl auto property in the hibernate cfg xml file to automatically create tables in your DB in order to store your entities in them if the table doesn t already exist   This can be handy during development where a new  in-memory  DB can be used and created a new on every run of the application or during testing

User · Answer

yes you can use   lt property name  hbm2ddl auto  value  create   gt

User · Answer

Hibernate can create a table  hibernate sequence and tables used for many-to-many mapping on your behalf but you have to explicitly configure it by calling setProperty  hibernate hbm2ddl auto    create   of the Configuration object  By Default  it just validates the schema with DB and fails if anything not already exists by giving error  ORA-00942  table or view does not exist    If you do above configuration then order of performed actions will be - a  Drop all tables and sequence and  do not give an error if they are not already present  b  create all table and sequence c  alter tables with constraints d  insert data into it

User · Answer

your hibernate hbm2ddl auto setting should be defining that the database is created  options are validate  create  update or create-drop

[java] Does Hibernate create tables in the database automatically

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