问题描述

当需要从 PostgreSQL 切换到 MariaDB/MySql 时，我的 json 列有问题.
我使用 Spring Boot + JPA + Hibernate + hibernate-types-52.
我要映射的表是这样的:

I have a problem with column json when it's necessary to switching from PostgreSQL to MariaDB/MySql.
I use Spring Boot + JPA + Hibernate + hibernate-types-52.
The table i want to map is like this:

CREATE TABLE atable(
 ...
 acolumn JSON,
 ... 
);

好的，它适用于 PostgreSQL 和 MariaDB/MySql.
问题是当我想部署一个应用程序时，因为 PostgreSQL 和 MySQL/MariaDB 的正确 hibernate-types-52 实现不同，所以可以轻松地从一个切换到另一个应用程序

这适用于 MySQL/MariaDB

Ok it works for PostgreSQL and MariaDB/MySql.
The problem is when i want to deploy an application that switch easly from one to another because the correct hibernate-types-52 implementation for PostgreSQL and MySQL/MariaDB are different

This works on MySQL/MariaDB

@Entity
@Table(name = "atable")
@TypeDef(name = "json", typeClass = JsonStringType.class)
  public class Atable {
  ...
  @Type(type = "json")
  @Column(name = "acolumn", columnDefinition = "json")
  private JsonNode acolumn;
  ...
}

这适用于 PosgreSQL

This works on PosgreSQL

@Entity
@Table(name = "atable")
@TypeDef(name = "json", typeClass = JsonBinaryType.class)
public class Atable {
  ...
  @Type(type = "json")
  @Column(name = "acolumn", columnDefinition = "json")
  private JsonNode acolumn;
  ...
}

任何从 JsonBinaryType 切换到 JsonStringType 的解决方案(或解决此问题的任何其他解决方案)都值得赞赏.

Any kind of solutions to switch from JsonBinaryType to JsonStringType (or any other solution to solve this) is appreciated.

推荐答案

从 2.11 版本的 Hibernate Types 项目开始，您可以只使用 JsonType，它适用于 PostgreSQL、MySQL、Oracle、SQL Server 或 H2.

Starting with the 2.11 version of the Hibernate Types project, you can just use the JsonType, which works with PostgreSQL, MySQL, Oracle, SQL Server, or H2.

所以，使用 JsonType 而不是 JsonBinaryType 或 JsonStringType

So, use JsonType instead of JsonBinaryType or JsonStringType

@Entity
@Table(name = "atable")
@TypeDef(name = "json", typeClass = JsonType.class)
public class Atable {

  @Type(type = "json")
  @Column(name = "acolumn", columnDefinition = "json")
  private JsonNode acolumn;

}

就是这样！

这篇关于项目同时使用 MySQL 和 PostgreSQL 时从 JsonStringType 切换到 JsonBinaryType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编程学习网！