Php/docs/mongocursor.setreadpreference
MongoCursor::setReadPreference
(PECL mongo >=1.3.3)
MongoCursor::setReadPreference — Set the read preference for this query
Description
public MongoCursor::setReadPreference
( string $read_preference
[, array $tags
] ) : MongoCursor
Parameters
read_preference- The read preference mode:
MongoClient::RP_PRIMARY,MongoClient::RP_PRIMARY_PREFERRED,MongoClient::RP_SECONDARY,MongoClient::RP_SECONDARY_PREFERRED, orMongoClient::RP_NEAREST. tags- An array of zero or more tag sets, where each tag set is itself an array of criteria used to match tags on replica set members.
Return Values
Returns this cursor.
Errors/Exceptions
Emits E_WARNING if either parameter is invalid, or if one or more tag sets are provided with the MongoClient::RP_PRIMARY read preference mode.
Examples
Example #1 MongoCursor::setReadPreference() tag set array syntax example
<?php$m = new MongoClient();$cursor = $m->test->users->find();// Prefer the nearest server in the "east" data center also used for reporting,// but fall back to a server in the "west" data center$cursor->setReadPreference(MongoClient::RP_NEAREST, array( array('dc' => 'east', 'use' => 'reporting'), array('dc' => 'west'),));?>
See Also
- The read preferences documentation.
- MongoCursor::getReadPreference() - Get the read preference for this query
- MongoCursorInterface::setReadPreference() - Set the read preference for this query
