迁移到Hibernate 5.x [英] Migrating to Hibernate 5.x

问题描述

我将应用程序从Hibernate 3迁移到Hibernate 5.我们使用 DatabaseMetadata 类来获取 TableMetadata 。因此，使用 TableMetadata 对象来获取数据库表列信息，如列大小，类型等。看起来在Hibernate 5中， DatabaseMetadata 类被弃用（删除！）。 Hibernate 5中有没有其他的替代方案可用于 DatabaseMetadata 类？或者如何在Hibernate 5 env中获得 TableMetadata ？

解决方案

它在我们转向采用模式工具的新方法时，我们在5.0中被删除了。 DatabaseMetadata表示来自底层数据库的现有目录/模式信息。在5.0中，该角色由 org.hibernate.tool.schema.extract.spi.DatabaseInformation 提供。这个（以及它之前的DatabaseMetadata）确实仅用于模式验证和模式迁移（更新）代码。它被传入这些电话。我假设你正在使用这是一种不同的方式。这不一定是支持的，但如果你想继续，那么你只需实例化一个 org.hibernate.tool.schema.extract.internal.DatabaseInformationImpl 实例。 / p>

I am migrating my application to Hibernate 5 from Hibernate 3. We are using DatabaseMetadata class to get TableMetadata. Hence using TableMetadata object to get DB table column information like column size, type..etc. It seems in Hibernate 5 DatabaseMetadata class got deprecated (removed!). Are there any alternatives for DatabaseMetadata class in Hibernate 5? Or else how to get TableMetadata in Hibernate 5 env?

解决方案

It got removed in 5.0 as we moved to a new approach to schema tooling. DatabaseMetadata represented the existing catalog/schema information from the underlying database. In 5.0 that role is served by org.hibernate.tool.schema.extract.spi.DatabaseInformation. That (and DatabaseMetadata before it) are really supported just for use in schema validation and schema migration (update) code. It is passed into those calls. I assume you are using this is a different way. That is not necessarily supported, but if you want to continue that anyway, you'd just instantiate a org.hibernate.tool.schema.extract.internal.DatabaseInformationImpl instance.

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