SecondaryTables (Java EE 5)

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SUMMARY: REQUIRED | OPTIONAL

DETAIL: ELEMENT

javax.persistence Annotation Type SecondaryTables

@Target(value=TYPE) @Retention(value=RUNTIME) public @interface SecondaryTables

Implements: Annotation

@Target(value=TYPE)
@Retention(value=RUNTIME)

此注释用于为实体类指定多个从属表格。

示例 1：多个从属表格，假定所有表格中的主键列名称相同。

@Entity
    @Table(name="EMPLOYEE")
    @SecondaryTables({
        @SecondaryTable(name="EMP_DETAIL"),
        @SecondaryTable(name="EMP_HIST")
    })
    public class Employee { ... }
    
示例 2：指定了不同主键列的多个从属表格。 

 @Entity
    @Table(name="EMPLOYEE")
    @SecondaryTables({
        @SecondaryTable(name="EMP_DETAIL", 
            pkJoinColumns=@PrimaryKeyJoinColumn(name="EMPL_ID")),
        @SecondaryTable(name="EMP_HIST", 
            pkJoinColumns=@PrimaryKeyJoinColumn(name="EMPLOYEE_ID"))
    })
    public class Employee { ... }

since

Java Persistence 1.0

英文文档：

This annotation is used to specify multiple secondary tables for an entity.

    Example 1: Multiple secondary tables assuming primary key columns are named the same in all tables.

    @Entity
    @Table(name="EMPLOYEE")
    @SecondaryTables({
        @SecondaryTable(name="EMP_DETAIL"),
        @SecondaryTable(name="EMP_HIST")
    })
    public class Employee { ... }
    
    Example 2: Multiple secondary tables with differently named primary key columns. 

    @Entity
    @Table(name="EMPLOYEE")
    @SecondaryTables({
        @SecondaryTable(name="EMP_DETAIL", 
            pkJoinColumns=@PrimaryKeyJoinColumn(name="EMPL_ID")),
        @SecondaryTable(name="EMP_HIST", 
            pkJoinColumns=@PrimaryKeyJoinColumn(name="EMPLOYEE_ID"))
    })
    public class Employee { ... }