PHP 5.6.0 released

The MongoCursorException class

(PECL mongo >= 1.0.0)

Introduction

Caused by accessing a cursor incorrectly or a error receiving a reply. Note that this can be thrown by any database request that receives a reply, not just queries. Writes, commands, and any other operation that sends information to the database and waits for a response can throw a MongoCursorException. The only exception is new MongoClient() (creating a new connection), which will only throw MongoConnectionExceptions.

This returns a specific error message to help diagnose the problem and a numeric error code associated with the cause of the exception.

For example, suppose you tried to insert two documents with the same _id:

<?php

try {
    
$collection->insert(array("_id" => 1), array("w" => 1));
    
$collection->insert(array("_id" => 1), array("w" => 1));
}
catch (
MongoCursorException $e) {
    echo 
"error message: ".$e->getMessage()."\n";
    echo 
"error code: ".$e->getCode()."\n";
}

?>
This would produce output like:
error message: E11000 duplicate key error index: foo.bar.$_id_  dup key: { : 1 }
error code: 11000
Note that the MongoDB error code (11000) is used for the PHP error code. The PHP driver uses the "native" error code wherever possible.

The following is a list of common errors, codes, and causes. Exact errors are in italics, errors where the message can vary are described in obliques.

  • cannot modify cursor after beginning iteration

    Code: 0

    You are calling a method that sets up the query after executing the query. Reset the cursor and try again.

    An example:

    <?php

    try {
        
    $cursor $collection->find();
        
    var_dump($cursor->getNext());

        
    // getNext() queried the database, it's too late to set a limit
        
    $cursor->limit(1);
    }
    catch (
    MongoCursorException $e) {
        echo 
    "error message: ".$e->getMessage()."\n";
        echo 
    "error code: ".$e->getCode()."\n";
    }

    // this will work, though:
    $cursor->getNext();
    $cursor->reset();
    $cursor->limit(1);

    ?>

  • Get next batch send errors

    Code: 1

    Could not send the query to the database. Make sure the database is still up and the network is okay.

  • cursor not found

    Code: 2

    The driver was trying to fetch more results from the database, but the database did not have a record of the query. This usually means that the cursor timed out on the server side: after a few minutes of inactivity, the database will kill a cursor (see MongoCursor::immortal() for information on preventing this).

    An example:

    <?php

    try {
        
    $cursor $collection->find();
        
    $cursor->getNext();

        
    // sleep for 15 minutes
        
    sleep(60*15);

        while (
    $cursor->hasNext()) {
            
    $cursor->getNext();
        }
    }
    catch (
    MongoCursorException $e) {
        echo 
    "error message: ".$e->getMessage()."\n";
        echo 
    "error code: ".$e->getCode()."\n";
    }

    ?>

  • cursor->buf.pos is null

    Code: 3

    This may indicate you are out of RAM or some other extraordinary circumstance.

  • couldn't get response header

    Code: 4

    A common error if the database or network goes down. This means that the driver couldn't get a response from the connection.

  • no db response

    Code: 5

    This may not even be an error, for example, the database command "shutdown" returns no response. However, if you were expecting a response, this means the database didn't give one.

  • bad response length: %d, did the db assert?

    Code: 6

    This means that the database said that its response was less than 0. This error probably indicates a network error or database corruption.

  • incomplete header

    Code: 7

    Highly unusual. Occurs if the database response started out correctly, but broke off in the middle. Probably indicates a network problem.

  • incomplete response

    Code: 8

    Highly unusual. Occurs if the database response started out correctly, but broke off in the middle. Probably indicates a network problem.

  • couldn't find a response

    Code: 9

    If the response was cached and now cannot be located.

  • error getting socket

    Code: 10

    The socket was closed or encountered an error. The driver should automatically reconnect (if possible) on the next operation.

  • couldn't find reply, please try again

    Code: 11

    The driver saves any database responses it cannot immediately match with a request. This exception occurs if the driver has already passed your request's response and cannot find your response in its cache.

  • error getting database response: errstr

    WSA error getting database response: errstr

    "errstr" is an io error reported directly from the C socket subsystem. On Windows, the error message is prefixed with "WSA".

  • Timeout error

    Code: 13

    If there was an error while waiting for a query to complete.

  • couldn't send query: <various>

    Code: 14

    C socket error on send.

  • max number of retries exhausted, couldn't send query

    Code: 19

    The driver will automatically retry "plain" queries (not commands) a couple of times if the first attempt failed for certain reasons. This is to cause fewer exceptions during replica set failover (although you will probably still have to deal with some) and gloss over transient network issues.

    This can also be caused by the driver not being able to reconnect at all to the database (if, for example, the database is unreachable).

    Version 1.2.2+.

Errors passed through by the database

Database errors should always trigger MongoCursorExceptions on queries. Error messages and codes are sent directly from the database and you should be able to see matching errors in the database log.

A few common database errors are listed below:

  • E11000 duplicate key error index: foo.bar.$X dup key: { /* ... */ }

    Code: 11000

    Database error for duplicate keys.

  • not master

    Codes: 10107, 13435, and 10058

    Not master errors, piped through by the database. ach of these will cause the driver to disconnect and attempt to find a new primary. The actual error you get on failover may not be a "not master" error, depending on when the change in primary occurs.

Class synopsis

MongoCursorException extends MongoException {
}

Table of Contents

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User Contributed Notes 1 note

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1
Loc d&#39;Anterroches
3 years ago
As all the exceptions are extending the base Exception class, you can get the code with the getCode() method:

<?php
try {
   
$collection->insert($duplicate_document, array('safe' => true));
} catch (
MongoCursorException $e) {
   
printf("Error code is %d.\n", $e->getCode();
    exit(
1);
}
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