如何在JPA中设置默认布尔值 | 如何在JPA中设置默认布尔值

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问题描述

我有一个属性

private boolean include;

我想将其默认值设置为true，这样在数据库中它必须显示True默认。这可能在JPA中吗？

I would like to set its default value to true, so that in the database it must display True from default. Is this possible in JPA?

推荐答案

据我所知，没有JPA原生解决方案来提供默认值。
这是我的解决方法：

As far as i known there is no JPA native solution to provide default values.Here it comes my workaround:

非数据库便携式解决方案

@Column(columnDefinition="tinyint(1) default 1")
private boolean include;

面向Java的解决方案

private boolean include = true;

面向Java加上构建器模式

     @Column(nullable = false)
     private Boolean include;
     ...
     public static class Builder {
      private Boolean include = true; // Here it comes your default value
      public Builder include (Boolean include ) {
      this.include = include ;
      return this;
     }
     // Use the pattern builder whenever you need to persist a new entity.
     public MyEntity build() {
       MyEntity myEntity = new MyEntity ();
       myEntity .setinclude (include );
       return myEntity;
      }
...
}

这是我的最爱并且不那么具有侵入性。基本上它委派任务来定义实体中Builder模式的默认值。

This is my favorite and less intrusive. Basically it delegates the task to define the default value to the Builder pattern in your entity.

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