如何从Java EE 6中的JPA2 EntityManager获取DataSource或Connection [英] How to get DataSource or Connection from JPA2 EntityManager in Java EE 6

问题描述

我有一个工作应用程序，我使用Java EE 6和EclipseLink进行持久化和PostgreSQL数据库。

I have a working application where I use Java EE 6 with EclipseLink for persistence and a PostgreSQL database.

对于用户注册我想设置密码PostgreSQL：

For the User-Registration I want to set the password in PostgreSQL to:

... password = crypt('inputPassword',gen_salt('bf')) ...

由于我不能使用DigestUtils，我必须手动将用户插入数据库。
为了保持我的应用程序可配置，我不想使用
InitialContextInstance.lookup（dataSource）查询DataSource，而是提取它（或连接） ）以某种方式从EntityManager
喜欢：

As I cant use DigestUtils for this, I have to insert the user manually into the DB. To keep my application configurable I do not want to query the DataSource with an InitialContextInstance.lookup(dataSource) but to extract it (or the Connection) somehow from the EntityManager like:

DataSource ds = entityManagerInstance.someFunctionThatReturnsADataSourceOrConnection();

或者可以使用createNativeQuery或类似的东西在
中使用预先准备好的语句防止注射？

Or would it be possible to use createNativeQuery or something similar in conjuntion with a prepared statement to protect against injections?

推荐答案

有时它只需要在谷歌再次运行：

sometimes it just takes another run in google:

entityManager.getTransaction().begin();
java.sql.Connection connection = entityManager.unwrap(java.sql.Connection.class);
...
entityManager.getTransaction().commit();

如 Eclipse链接文档

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