PHP Manual
MongoCursor
Get the read preference for this query

MongoCursor::getReadPreference

(PECL mongo >=1.3.3)

MongoCursor::getReadPreference — Get the read preference for this query

说明

public MongoCursor::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.

范例

Example #1 MongoCursor::getReadPreference() return value example

 <?php

$m = new MongoClient();
$cursor = $m->test->users->find();
$cursor->setReadPreference(MongoClient::RP_SECONDARY, array(
    array('dc' => 'east', 'use' => 'reporting'),
    array('dc' => 'west'),
    array(),
));
var_dump($cursor->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.
MongoCursor::setReadPreference() - Set the read preference for this query
MongoCursorInterface::getReadPreference() - Get the read preference for this query