MongoClient::getReadPreference

(PECL mongo >=1.3.0)

MongoClient::getReadPreference — 获取此连接的读取首选项

This extension that defines this method is deprecated. Instead, the MongoDB extension should be used. There is no equivalent for this method in the new extension.

说明

public MongoClient::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 返回的值修改为兼容 MongoClient::setReadPreference()。 type 的值从数组改成字符串，删除了 type_string，并且 tagsets 现在以键值表示的标签而不是冒号分隔的字符串。

范例

Example #1 MongoClient::getReadPreference() 返回值例子

<?php

$m = new MongoClient();
$m->setReadPreference(MongoClient::RP_SECONDARY, array(
    array('dc' => 'east', 'use' => 'reporting'),
    array('dc' => 'west'),
    array(),
));
var_dump($m->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