MongoDB\Driver\Server::executeReadCommand
(mongodb >=1.4.0)
MongoDB\Driver\Server::executeReadCommand — Execute a database command that reads on this server
说明
$db, MongoDB\Driver\Command $command, ?array $options = null): MongoDB\Driver\Cursor
Executes the command on this server, irrespective of the
"readPreference" option.
This method will apply logic that is specific to commands that read (e.g.
» distinct).
Default values for the "readPreference" and
"readConcern" options will be inferred from an active
transaction (indicated by the "session" option), followed
by the connection URI.
注意: The
"readPreference"option does not control the server to which the driver issues the operation; it will always be executed on this server object. Instead, it may be used when issuing the operation to a secondary (from a replica set connection, not standalone) or mongos node to ensure that the driver sets the wire protocol accordingly or adds the read preference to the operation, respectively.
参数
db(string)-
The name of the database on which to execute the command.
command(MongoDB\Driver\Command)-
The command to execute.
options-
options Option Type Description readConcern MongoDB\Driver\ReadConcern A read concern to apply to the operation.
This option is available in MongoDB 3.2+ and will result in an exception at execution time if specified for an older server version.
readPreference MongoDB\Driver\ReadPreference A read preference to use for selecting a server for the operation.
session MongoDB\Driver\Session A session to associate with the operation.
警告If you are using a
"session"which has a transaction in progress, you cannot specify a"readConcern"or"writeConcern"option. This will result in an MongoDB\Driver\Exception\InvalidArgumentException being thrown. Instead, you should set these two options when you create the transaction with MongoDB\Driver\Session::startTransaction().
返回值
Returns MongoDB\Driver\Cursor on success.
错误／异常
- Throws MongoDB\Driver\Exception\InvalidArgumentException if the
"session"option is used with an associated transaction in combination with a"readConcern"or"writeConcern"option. - 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 on other errors (e.g. invalid command).
参见
- MongoDB\Driver\Command
- MongoDB\Driver\Cursor
- MongoDB\Driver\Server::executeCommand() - Execute a database command on this server
- MongoDB\Driver\Server::executeReadWriteCommand() - Execute a database command that reads and writes on this server
- MongoDB\Driver\Server::executeWriteCommand() - Execute a database command that writes on this server
- MongoDB\Driver\Manager::executeReadCommand() - Execute a database command that reads
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