如何在PlayJPA中保存对象列表-HowtosaveaListofobjectsinPlayJPA

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In play 1.x, when the server receives a request, play/jpa will open a transaction to you database. This transaction will automatically be rolled back if anything goes wrong, else it automatically commits when the response is sent to the client.

在play 1.x中，当服务器收到请求时，play / jpa将向您的数据库打开一个事务。如果出现任何问题，此事务将自动回滚，否则在响应发送到客户端时会自动提交。

Therefor, even if you loop through your JPA entities and call save() on them one after another, they will all be executed with the same connection in the same transaction.

因此，即使您遍历JPA实体并一个接一个地调用它们上的save（），它们也将在同一事务中使用相同的连接执行。

I would think it works the same way in Play 2, but honestly, I don't know.

我认为它在Play 2中的工作方式相同，但老实说，我不知道。

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The simple answer will not NO. Some one down the line will have to execute insert query for all individual objects.

简单的答案不会是NO。线下的某个人必须对所有单个对象执行插入查询。

You do not have to create new connection for each insert. You should create a connection and fire insert on the same connection in each iteration.

您不必为每个插入创建新连接。您应该在每次迭代中在同一连接上创建连接和触发插入。

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Maybe this question gets you further. If you know how to do what you want on the underlying DB, you also could use a native query (which you can create via the EntityManager), I suppose.

也许这个问题会让你更进一步。如果你知道如何在底层数据库上做你想做的事情，你也可以使用本机查询（你可以通过EntityManager创建），我想。