MongoCursorInterface::setReadPreference

(PECL mongo >=1.6.0)

MongoCursorInterface::setReadPreference — Set the read preference for this query

说明

abstract public MongoCursorInterface::setReadPreference ( string $read_preference , array $tags = ? ) : MongoCursorInterface

参数

read_preference

The read preference mode: MongoClient::RP_PRIMARY, MongoClient::RP_PRIMARY_PREFERRED, MongoClient::RP_SECONDARY, MongoClient::RP_SECONDARY_PREFERRED, or MongoClient::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.

返回值

Returns this cursor.

错误／异常

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.

参见