问题描述
我在我的Web应用程序中使用spring-boot并使用spring-jpa来读取/写入我的数据库。它工作得很好，但我想了解如何管理数据库连接。下面是我对数据库的属性配置：
I am using spring-boot in my web application and use spring-jpa to read/write from/to my database. It works very well but I want to understand how to manage the database connections. Below is my properties configuration for database:
spring.datasource.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf8
spring.datasource.username=user
spring.datasource.password=pwd
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.max-active=500
我已将最大连接数设置为500.当用户在我的spring应用程序上发出请求，将为他打开一个数据库连接。完成请求后，春天jpa会关闭这个连接吗？如果没有，它什么时候会关闭未使用的连接？
I have set the maximum connections to 500. When a user makes a request on my spring application, a database connection will be opened for him. After finishing the request, will spring jpa close this connection? If not, when will it close the unused connections?
我已经阅读了来自 。但它没有提到关于连接的任何事情。
I have read through the spring jpa reference document from http://docs.spring.io/spring-data/jpa/docs/current/reference/html/. But it doesn't mention anything about the connections.
推荐答案
使用数据库连接池时，调用 sqlconnection.close（）不一定会关闭与数据库的重量级连接，而是通常只会将连接释放为可在池中重复使用。这就是为什么建议在利用客户端连接池时尽快调用连接上的 close（）。
When using DB connection pooling, a call to sqlconnection.close() will not necessarily close the heavyweight connection to the database, instead most often will just release the connection as re-usable in the pool. That's why it is advisable to invoke the close() on connection as soon as possible when leveraging a client side connection pool.
在您的配置中，池将包含最多500个连接（配置 maxIdle ， minIdle 和 minEvictableIdleTimeMillis 调整即用型连接的数量以及不使用时释放它们的频率。）
In your configuration, the pool will contain a maximum number of 500 connections ( it would be also good to configure maxIdle, minIdle, and minEvictableIdleTimeMillis to tune the number of ready-to-use connections and how often to release them when not used).
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