33.1. 数据库连接控制函数 33.1.1. 连接字符串 33.1.2. 参数关键词下列函数会建立到一个PostgreSQL后端服务器的连接。一个应用程序可以在一个时刻打开多个后端连接（原因之一就是为了访问多个数据库）。每个连接用一个PGconn对象表示，它从函数PQconnectdb、PQconnectdbParams或PQsetdbLogin得到。注意这些函数将总是返回一个非空的...

文章 2022-02-17 来自：开发者社区

PostgreSQL 10.1 手册_部分 III. 服务器管理_第 21 章数据库角色_21.6. 函数和触发器安全性

21.6. 函数和触发器安全性函数和触发器允许用户在后端服务器中插入代码，其他用户不会注意到这些代码的执行。因此，两种机制允许用户相对容易地为其他人设置“特洛伊木马”。唯一真正的保护是收紧对能定义函数的用户的控制。在后端服务器进程中运行的函数带有数据库服务器守护进程的操作系统权限。如果用于函数的编程语言允许非检查的内存访问，它就可能改变服务器的内部数据结构。因此，在很多其他事情中，这...

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