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                # dblink_get_notify ## Name dblink_get_notify?--?在連接上檢索異步通知 ## Synopsis ``` dblink_get_notify() returns setof (notify_name text, be_pid int, extra text) dblink_get_notify(text connname) returns setof (notify_name text, be_pid int, extra text) ``` ## 描述 `dblink_get_notify`在未命名連接上檢索通知,或者如果指定了則在命名的連接上。 為了通過dblink接收通知,必須首先使用`dblink_exec`發出`LISTEN`, 更多詳情請參閱[LISTEN](#calibre_link-983)和[NOTIFY](#calibre_link-982)。 ## 參數 `conname` 獲取通知的已命名連接名字。 ## 返回值 返回`setof (notify_name text, be_pid int, extra text)`,如果沒有則返回空集。 ## 例子 ``` SELECT dblink_exec('LISTEN virtual'); dblink_exec ------------- LISTEN (1 row) SELECT * FROM dblink_get_notify(); notify_name | be_pid | extra -------------+--------+------- (0 rows) NOTIFY virtual; NOTIFY SELECT * FROM dblink_get_notify(); notify_name | be_pid | extra -------------+--------+------- virtual | 1229 | (1 row) ```
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