Hibernate中id的table生成策略之联合主键

最新推荐文章于 2024-11-15 12:03:05 发布

最新推荐文章于 2024-11-15 12:03:05 发布 · 384 阅读

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#java

本文介绍了一个名为Student的Java实体类，该类使用了@TableGenerator注解定义了两种不同的TableGenerationStrategy来生成主键ID，一种用于生成学生ID，另一种用于生成学生组ID。通过这种方式可以实现更灵活和可控的ID生成机制。

@Entity
@Table(name = "tbl_Student")
public class Student implements Serializable
{

private int id;

private int groupId;

@Id
@TableGenerator(name = "student_gen1", table = "XT_XH", pkColumnName = "TYPE", valueColumnName = "XH", pkColumnValue = "stu1", allocationSize = 1)
@GeneratedValue(strategy = GenerationType.TABLE, generator = "student_gen1")
public int getId()
{
return id;
}

..........................................................................

@Id
@TableGenerator(name = "student_gen2", table = "XT_XH", pkColumnName = "TYPE", valueColumnName = "XH", pkColumnValue = "stu2", allocationSize = 1)
@GeneratedValue(strategy = GenerationType.TABLE, generator = "student_gen2")
public int getGroupId()
{
return groupId;
}

....................................................................

}

详细的id的table生成策略叙述，见

http://blog.youkuaiyun.com/woshixuye/article/details/7278119