Php/docs/mongodb.getreadpreference
MongoDB::getReadPreference
(PECL mongo >=1.3.0)
MongoDB::getReadPreference — Get the read preference for this database
说明
public MongoDB::getReadPreference ( ) : array
参数
此函数没有参数。
返回值
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.
更新日志
版本 | 说明 |
---|---|
PECL mongo 1.3.3 | The return value has changed to be consistent with
MongoDB::setReadPreference(). The
|
范例
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) { } } }
参见
- The read preferences documentation.
- MongoDB::setReadPreference() - Set the read preference for this database