如何在Playframework中更新模型的特定字段? [英] How do I update a certain field of a Model in Playframework?

问题描述

假设我们有一个User类，如果我想更新它的名称:

Suppose we have a User class, if I want to update it's name:

User user = User.findById(123); user.name =某人"; user.save();

User user = User.findById(123); user.name = "someone"; user.save();

生成的SQL将是

update user as user0 set user0.name = ? user0.email = ? .....

这意味着Play并没有意识到我只想更新一个字段.有什么办法可以使生成的SQL仅更新指定的字段?

That means Play didn't realize I just want to update a single field. Is there any way could make the generated SQL only update the specified fields ?

推荐答案

信息:这是Play 2 + Ebean的答案！因此它不适用于Play 1 + JPA

Ebean的API 中有一些选项，因此您应该检查并选择一个:

There are some options in Ebean's API, so you should check it and choose one:

• Update<T> -签入@NamedUpdates注释的示例
• SqlUpdate -您可以只需执行原始SQL更新，而无需指定实体类型

• Update<T> - check in the sample for @NamedUpdates annotation
• Ebean.createUpdate(beanType, updStatement)
• SqlUpdate - you can just perform raw SQL update, without need for giving the entity type

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