MongoDB\Driver\Manager::selectServer
(mongodb >=1.0.0)
MongoDB\Driver\Manager::selectServer — Select a server matching a read preference
说明
$readPreference = null): MongoDB\Driver\Server
Selects a MongoDB\Driver\Server matching
readPreference. If
readPreference is null or omitted, the primary
server will be selected by default. This may be used to preselect a server in
order to perform version checking before executing an operation.
注意: Unlike MongoDB\Driver\Manager::getServers(), this method will initialize database connections and perform server discovery if necessary. See the » Server Selection Specification for additional information.
参数
-
readPreference(MongoDB\Driver\ReadPreference) -
The read preference to use for selecting a server. If
nullor omitted, the primary server will be selected by default.
返回值
Returns a MongoDB\Driver\Server matching the read preference.
错误／异常
- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.
- Throws MongoDB\Driver\Exception\ConnectionException if connection to the server fails (for reasons other than authentication).
- Throws MongoDB\Driver\Exception\AuthenticationException if authentication is needed and fails.
- Throws MongoDB\Driver\Exception\RuntimeException if a server matching the read preference could not be found.
更新日志
| 版本 | 说明 |
|---|---|
| PECL mongodb 1.11.0 |
The readPreference is now optional. If null or
omitted, the primary server will be selected by default.
|
参见
- MongoDB\Driver\Server
- MongoDB\Driver\Manager::getServers() - Return the servers to which this manager is connected
- » Server Selection Specification
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