MongoDB\Driver\Server::executeReadCommand

(mongodb >=1.4.0)

MongoDB\Driver\Server::executeReadCommand — Execute a database command that reads on this server

说明

final public MongoDB\Driver\Server::executeReadCommand(string $db, MongoDB\Driver\Command $command, array $options = array()): MongoDB\Driver\Cursor

Executes the command on this server.

This method will apply logic that is specific to commands that read (e.g. » count) and take the MongoDB server version into account. The "readConcern" option will default to the corresponding value from the MongoDB 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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官方地址：https://www.php.net/manual/en/mongodb-driver-server.executereadcommand.php

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MongoDB\Driver\Server::executeReadCommand

说明

参数

返回值

错误／异常

参见

User Contributed Notes