Original link: https://v3u.cn/a_id_217
A common problem we often face during development is how to properly manage external resources, such as databases, locks, or network connections. Without care, the program will keep these resources forever, even if we no longer need them. Such problems are called memory leaks, because each time a new instance of a given resource is created and opened without closing the existing resource, the available memory is reduced. Properly managing resources is often a tricky problem, as the use of resources often requires aftercare. The aftermath requires some cleanup, such as closing the database, releasing locks, or closing network connections. If you forget to perform these cleanup operations, you can waste valuable system resources such as memory and network bandwidth. Background For example, when developers work with databases, a common problem that can arise is that programs keep creating new connections without releasing or reusing them. In this case, the database backend can stop accepting…
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