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이 문서에서는 PHP 중국어 웹사이트 매뉴얼 풀어 주다
(PECL mongo >=1.3.0)
MongoDB::getReadPreference — Get the read preference for this database
此函数没有参数。
This function returns an array describing the read preference. The array contains the values type for the string read preference mode (corresponding to the MongoClient constants), and tagsets containing a list of all tag set criteria. If no tag sets were specified, tagsets will not be present in the array.
版本 | 说明 |
---|---|
1.3.3 | The return value has changed to be consistent with MongoDB::setReadPreference() . The type value was changed from a number to a string, type_string was removed, and tagsets now expresses tags as key/value pairs instead of colon-delimited strings. |
Example #1 MongoDB::getReadPreference() return value example
<?php
$m = new MongoClient ();
$db = $m -> test ;
$db -> setReadPreference ( MongoClient :: RP_SECONDARY , array(
array( 'dc' => 'east' , 'use' => 'reporting' ),
array( 'dc' => 'west' ),
array(),
));
var_dump ( $db -> getReadPreference ());
?>
以上例程会输出:
array(2) { ["type"]=> string(9) "secondary" ["tagsets"]=> array(3) { [0]=> array(2) { ["dc"]=> string(4) "east" ["use"]=> string(9) "reporting" } [1]=> array(1) { ["dc"]=> string(7) "west" } [2]=> array(0) { } } }