自定义@Column JPA批注，如何? [英] Custom @Column JPA Annotations, how to?

问题描述

在声明实体POJO时，一直努力寻找创建一些自定义JPA注释以替换重复字段的解决方案.有什么帮助吗?这是我想要达到的目标:

Been trying hard to search for a solution to create some Custom JPA Annotations to replace repetitive fields when declaring Entity POJOs. Any help? Here what I am trying to achieve:

//@Column(name = "is_enabled", nullable = false, columnDefinition = "tinyint(1) DEFAULT 1")
@ColumnBooleanNotNullDefaultOne
private Boolean isEnabled;

或

//@Column(name = "created", nullable = false, updatable = false, insertable = false, columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP")
@ColumnTimestamp
private Timestamp created;

但是，我的尝试失败了……

However, my attempts are failing...

@Target({METHOD, FIELD})
@Retention(RUNTIME)
@Column // <-- Error here (The annotation @Column is disallowed for this location.)
public @interface BooleanNotNullDefaultOne
{

}

任何帮助都必须得到重视.

Any help is definatelly aprecciated.

谢谢！

推荐答案

生成一个实现UserType的新类，并使用以下注释:

Generate a new Class that implements UserType and use this annotation:

@Type(type="fully.qualified.name.of.YourUserType")

此外，@ Column批注只能在方法或变量上使用.查看Column接口定义的@Target，以了解原因.

Also, the @Column annotation can only be used on a method or variable. Take a look at the @Target of the Column interface definition to understand why.

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