MongoCursor::getReadPreference

(PECL mongo >=1.3.3)

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

说明

public array MongoCursor::getReadPreference ( void )

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()