Hibernate, one-to-many, many-to-a

Configuration of Hibernate environment

Configuration of the Hibernate.cfg.xml

<?XML version= ' 1.0 ' encoding= ' utf-8 '?><!DOCTYPE hibernate-configuration Public "-//hibernate/hibernate configuration DTD 3.0//en" "Http://www.hi Bernate.org/dtd/hibernate-configuration-3.0.dtd "><hibernate-configuration>    <session-factory>        <!--Database Connection Settings -       < Propertyname= "Connection.driver_class">Oracle.jdbc.driver.OracleDriver</ Property>        < Propertyname= "Connection.url">Jdbc:oracle:thin:@127.0.0.1:1521:orcl</ Property>        < Propertyname= "Connection.username">Scott</ Property>        < Propertyname= "Connection.password">Tiger</ Property>                <!--JDBC Connection pool (use the built-in) -       <!--<property name= "connection.pool_size" >10</property> -                <!--minimum number of connections for database connections -        < Propertyname= "C3p0.min_size">10</ Property>        <!--maximum number of connections to a database connection -        < Propertyname= "C3p0.max_size">100</ Property>        < Propertyname= "C3p0.timeout">3000</ Property>        < Propertyname= "Hibernate.temp.use_jdbc_metadata_defaults">False</ Property>             <!--SQL dialect dialect -        < Propertyname= "dialect">Org.hibernate.dialect.Oracle10gDialect</ Property>        <!--Echo all executed SQL to stdout (console) -        < Propertyname= "Show_sql">True</ Property>        <!--formatted SQL statement output view -        < Propertyname= "Format_sql">True</ Property>                        <!--Drop and re-create the database schema on startup -        < Propertyname= "Hbm2ddl.auto">Update</ Property>                 <!--mapping files for entity classes -        <MappingResource= "Com/zhiyou/entity/user.hbm.xml"/>    </session-factory></hibernate-configuration>

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Each entity class corresponds to a mapping file

such as the user class, with the Username,password,role property

corresponding mapping file User.hbm.xml

<?XML version= "1.0"?><!DOCTYPE hibernate-mapping Public "-//hibernate/hibernate mapping DTD 3.0//en" "Http://www.hibernate.org/dtd/hibe Rnate-mapping-3.0.dtd "><hibernate-mapping Package= "Com.zhiyou.entity">    <!--class: Specifies the entity class name: Entity class names Table: Name of the tables in the database -    <classname= "User"Table= "User1">    <!--ID PRIMARY Key -        <IDname= "Name"column= "user_name">               <!--primary key Generation policy assigned: The user specifies the primary key sequence: Specifies the sequence UUID of the Oracle database: produces a 32-bit string Nati VE: Automatic selection of primary key generation strategy based on database -           <!--<generator class= "sequence" > Parameter name <param name= "sequence" >seq_test</param> </generator> -                        <Generatorclass= "Native"></Generator>                    </ID>        < Propertyname= "pwd"column= "Password"/>        < Propertyname= "Role"column= "Role"/>    </class></hibernate-mapping>

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It is important to note that the mapping file for the entity class needs to be configured in Hibernate.cfg.xml.

One-to-many

Hibernate, one-to-many, many-to-a