pg_get_notify

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

pg_get_notify获取 SQL NOTIFY 消息

说明

pg_get_notify(PgSql\Connection $connection, int $mode = PGSQL_ASSOC): array|false

pg_get_notify() 取得 SQL 命令 NOTIFY 生成的消息。要接收通知,必须发送 SQL 命令 LISTEN

参数

connection

PgSql\Connection 实例。

mode

An optional parameter that controls how the returned array is indexed. mode is a constant and can take the following values: PGSQL_ASSOC, PGSQL_NUM and PGSQL_BOTH. Using PGSQL_NUM, the function will return an array with numerical indices, using PGSQL_ASSOC it will return only associative indices while PGSQL_BOTH will return both numerical and associative indices.

返回值

包含 NOTIFY 消息名称和后端 PID 的 array。如果服务器支持,该数组还包含服务器版本和有效负载。否则,如果没有 NOTIFY 正在等待,则返回 false

更新日志

版本 说明
8.1.0 现在 connection 参数接受 PgSql\Connection 实例,之前接受 资源(resource)

范例

示例 #1 PostgreSQL NOTIFY 消息

<?php
$conn
= pg_pconnect("dbname=publisher");
if (!
$conn) {
echo
"An error occurred.\n";
exit;
}

// 从其它进程监听 'author_updated' 消息
pg_query($conn, 'LISTEN author_updated;');
$notify = pg_get_notify($conn);
if (!
$notify) {
echo
"No messages\n";
} else {
print_r($notify);
}
?>

参见

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