EJB规范允许映射一个实体到多个表，你可以通过使用@SecondaryTable批注.
Customer组件映射它的地址属性到一个分开的ADDRESS表.首先定义第二个表.
@Entity
@Table(name = "CUSTOMER")
@SecondaryTable(name = "EMBEDDED_ADDRESS", join = {@JoinColumn(name = "ADDRESS_ID")})
public class Customer implements java.io.Serializable
{}
第二个表的@JoinColumn注释name属性必需与Customer的主键匹配.
@Column.
@Column(name = "STREET", secondaryTable = "EMBEDDED_ADDRESS")
public String getStreet()
{
return street;
}
注意：在JBoss内置数据库中不会出现这样的警告
MySQL中会出现
18:55:15,125 INFO [SessionFactoryObjectFactory] Not binding factory to JNDI, no
JNDI name configured
18:55:15,140 INFO [SchemaExport] Running hbm2ddl schema export
18:55:15,140 INFO [SchemaExport] exporting generated schema to database
18:55:15,171 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02
18:55:15,187 WARN [JDBCExceptionReporter] Unknown table 'customer'
18:55:15,187 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02
18:55:15,187 WARN [JDBCExceptionReporter] Unknown table 'customer'
18:55:15,187 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02
18:55:15,187 WARN [JDBCExceptionReporter] Unknown table 'embedded_address'
18:55:15,281 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02
18:55:15,281 WARN [JDBCExceptionReporter] Unknown table 'customer'
18:55:15,281 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02
18:55:15,281 WARN [JDBCExceptionReporter] Unknown table 'embedded_address'
18:55:15,500 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02
18:55:15,500 WARN [JDBCExceptionReporter] Unknown table 'customer'
18:55:15,500 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02
18:55:15,500 WARN [JDBCExceptionReporter] Unknown table 'embedded_address'
18:55:15,718 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02
18:55:15,718 WARN [JDBCExceptionReporter] Unknown table 'customer'
18:55:15,718 WARN [JDBCExceptionReporter] SQL Warning: 1051, SQLState: 42S02
18:55:15,734 WARN [JDBCExceptionReporter] Unknown table 'embedded_address'
18:55:15,734 INFO [SchemaExport] schema export complete
18:55:15,750 INFO [NamingHelper] JNDI InitialContext properties:{java.naming.fa
ctory.initial=org.jnp.interfaces.NamingContextFactory, java.naming.factory.url.p
kgs=org.jboss.naming:org.jnp.interfaces}
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