MongoDB\Driver\Server::executeReadCommand
(mongodb >=1.4.0)
MongoDB\Driver\Server::executeReadCommand — Execute a database command that reads on this server
Descrição
$db
, MongoDB\Driver\Command $command
, array $options = array()
) : MongoDB\Driver\CursorExecutes 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.
Nota: 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.
Parâmetros
-
db(string) -
O nome do banco a executar o comando.
-
command(MongoDB\Driver\Command) -
O MongoDB\Driver\Command a executar.
-
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.
AvisoIf 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().
Valor Retornado
Retorna MongoDB\Driver\Cursor no sucesso.
Erros
- Throws MongoDB\Driver\Exception\InvalidArgumentException if the
"session"option is used with an associated transaction in combination with a"readConcern"or"writeConcern"option. - Lança MongoDB\Driver\Exception\InvalidArgumentException no caso de erros ao interpretar parâmetros.
- Lança MongoDB\Driver\Exception\ConnectionException se a conexão com o servidor falhar (por razões outras que autenticação).
- Lança MongoDB\Driver\Exception\AuthenticationException se a autenticação é necessária e falha.
- Throws MongoDB\Driver\Exception\RuntimeException on other errors (e.g. invalid command).
Veja Também
- 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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