MongoDB::getReadPreference
(PECL mongo >=1.3.0)
MongoDB::getReadPreference — Get the read preference for this database
说明
public MongoDB::getReadPreference
( void
) : 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 |
|---|---|
| 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.
|
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
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