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pg_trace

pg_trace

(PHP 4 >= 4.0.1, PHP 5)

pg_trace启动一个 PostgreSQL 连接的追踪功能

说明

bool pg_trace ( string $pathname [, string $mode [, resource $connection ]] )

pg_trace() 启动 PostgreSQL 前端/后端通讯的追踪并记录到 pathname 指定的文件中。要完全理解结果,用户需要熟悉 PostgreSQL 通讯协议的本质。对不熟悉的用户来说,追踪发送到服务器的查询错误依然有用,例如可以用 grep '^To backend' trace.log 来查看哪些查询实际上被发送到了 PostgreSQL 服务器。更多信息参考 PostgreSQL 手册。

参数 pathnamemodefopen()(mode 默认为 'w') 中的一样。connection 指定了要追踪的连接,默认为上一个打开的连接。

如果 pathname 可以作为日志文件打开,则 pg_trace() 返回 TRUE,否则返回 FALSE

参见 fopen()pg_untrace()


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