问题描述
我有一个Java实体，该实体的字段带有@Formula批注，在其中执行SQL查询，其中包含Firebird数据库的某些特定功能.现在，我必须迁移到Oracle数据库，并且需要替换该@Formula中的SQL代码.有办法实现吗?我可以通过某种方式扩展Hibernate @Formula以便在运行时更改注释的值吗?谢谢
I have a Java Entity with a field with the annotation @Formula, in which is executed an SQL query containing some specific function for Firebird database.Now I have to migrate to Oracle database, and I need to replace the SQL code inside that @Formula.Is there a way to achieve this ? Can I extend in some way the Hibernate @Formula in order to change the annotation's value at runtime ?Thanks
推荐答案
您可以实现这种略有不同的方式.
You can achieve this slightly different way.
您可以在@Formula中放置占位符"{TO_BE_REPLACED}"并添加一个Hibernate Interceptor来更改 onPrepareStatement .在那里您可以更改由休眠生成的SQL. JUst检查SQL字符串并将{TO_BE_REPLACED}替换为您的实际值.
You can place in the @Formula a placeholder "{TO_BE_REPLACED}" and add a Hibernate Interceptor to change onPrepareStatement.There you can can change SQL generated by hibernate. JUst check the SQL string and replace the {TO_BE_REPLACED} with your real value.
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