Php/docs/mongocursorinterface.setreadpreference
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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
, 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.
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
- The read preferences documentation.
- MongoCursorInterface::getReadPreference() - Get the read preference for this query