Grails 3和Java 8时间支持 [英] Grails 3 and Java 8 time support

问题描述

在grails 3应用程序中，我看到新的java.time类被保存到数据库中。动态查询和创建标准的作品。但是，我想知道是否有更好的方法来将这些时间数据存储到数据库中。当我查看数据库时，我看到一些二进制数据，它似乎只是序列化时间对象。

是否有任何与joda-time-plugin类似的插件，或者是否有任何类似的插件如何为java.time类配置数据库映射？

解决方案

strong>：Grails 3.1.1有hibernate 5，所以这不再是一个问题了......

Grails

我终于找到了解决方案。首先，hibernate 5为java 8时间实现持久化（ https://hibernate.atlassian.net/browse / HHH-8844 ）。然而，grails 3使用hibernate 4，我还没有发现任何计划在grails中升级hibernate。

有一个java 8时间hibernate用户类型的实现（jadira extended包），它可以像joda时间插件一样使用（请参阅 http：// gpc .github.io /乔达时间/导向/ persistence.html ）。对我而言，只有版本3.1.0.GA和更低的工作。

build.gradle

  dependencies {
 compileorg.jadira.usertype：usertype.extended：3.1.0.GA
} 
  

application.groovy

  grails.gorm.default.mapping = {
user-typetype：org.jadira.usertype.dateandtime.threeten.PersistentInstantAsMillisLong，class：java.time.Instant 
} 
  

In grails 3 application, I see that new java.time classes are persisted to database. Dynamic queries and create criteria works. However, I am wondering if there is some better way how to store these time data to database. When I look to database I see some binary data, it seems it just serialize the time objects.

Is there any similar plugin as joda-time-plugin or is there any way how to configure database mapping for java.time classes?

解决方案

Edit: Grails 3.1.1 has hibernate 5 so this is not an issue anymore...

Grails

I finally found a solution. First of all hibernate 5 implements persistent for java 8 time (https://hibernate.atlassian.net/browse/HHH-8844). However, grails 3 uses hibernate 4 and I haven't found any plans to upgrade hibernate in grails.

There is an implementation for java 8 time hibernate user types (jadira extended package) which can be used similarly as in joda time plugin (see http://gpc.github.io/joda-time/guide/persistence.html). For me only version 3.1.0.GA and lower worked.

build.gradle

dependencies {
    compile "org.jadira.usertype:usertype.extended:3.1.0.GA"
}

application.groovy

grails.gorm.default.mapping = {
    "user-type" type: org.jadira.usertype.dateandtime.threeten.PersistentInstantAsMillisLong, class: java.time.Instant
}

这篇关于Grails 3和Java 8时间支持的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！