PropertyPlaceholderConfigurer查找数据库值并将属性文件用作后备 [英] PropertyPlaceholderConfigurer to look for DB values and use properties file as fallback

问题描述

我想知道是否有可能在PropertyPlaceholderConfigurer中使用属性文件之前的DB中的值.因此，我要实现的是加载属性文件，并且如果数据库中存在任何键，请使用该文件.现在我不知道从哪里开始，但是我假设有一个可以重写的方法/类或需要实现的接口.

I'm wondering if its possible to use the value in DB before properties file in PropertyPlaceholderConfigurer. So what I want to achieve is to load the properties file, and if any keys exist in the database, use that. Right now I don't know where to start, but I'm assuming that there is a method/class that I can override or interface that I need to implement.

仅提及方法/类/接口，我将很高兴从这里开始. TIA

Just mention the method/class/interface and I will gladly start from there. TIA

推荐答案

PropertyPlaceholderConfigurer具有属性"属性，该属性可以指向检索数据库值的对象.在此处查看示例: http://pure- essential.net/2011/02/10/spring-loading-properties-from-database-with-a-twist/

PropertyPlaceholderConfigurer has a "properties" property that can point to an object that retrieves the database values. See an example here: http://pure-essence.net/2011/02/10/spring-loading-properties-from-database-with-a-twist/

此外，您还要在从数据库加载属性的Bean上将"ignoreUnresolvablePlaceholders"设置为true.这样，您可以添加另一个PropertyPlaceholderConfigurer作为后备，以提供数据库中找不到的属性.

Also, you'll want to set "ignoreUnresolvablePlaceholders" to true on the bean that config that loads the properties from the database. That way you can add another PropertyPlaceholderConfigurer as a fallback to provide properties that are not found in the database.

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