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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@315036 c90b9560-bf6c-de11-be94-00142212c4b1
430 lines
11 KiB
XML
430 lines
11 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<phpdoc:classref xml:id="class.mongocursorexception" xmlns:phpdoc="http://php.net/ns/phpdoc" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude">
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<title>The MongoCursorException class</title>
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<titleabbrev>MongoCursorException</titleabbrev>
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<partintro>
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<!-- {{{ MongoCursorException intro -->
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<section xml:id="mongocursorexception.intro">
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&reftitle.intro;
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<para>
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Caused by accessing a cursor incorrectly or a error receiving a reply. Note
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that this can be thrown by any database request that receives a reply, not
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just queries. Writes, commands, and any other operation that sends
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information to the database and waits for a response can throw a
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<classname>MongoCursorException</classname>. The only exception is
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<literal>new Mongo()</literal> (creating a new connection), which will only
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throw <classname>MongoConnectionException</classname>s.
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</para>
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<para>
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This returns a specific error message to help diagnose the problem and a
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numeric error code associated with the cause of the exception.
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</para>
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<para>
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For example, suppose you tried to insert two documents with the same _id:
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<programlisting role="php">
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<![CDATA[
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<?php
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try {
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$collection->insert(array("_id" => 1), array("safe" => true));
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$collection->insert(array("_id" => 1), array("safe" => true));
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}
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catch (MongoCursorException $e) {
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echo "error message: ".$e->getMessage()."\n";
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echo "error code: ".$e->getCode()."\n";
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}
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?>
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]]>
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</programlisting>
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This would produce output like:
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<programlisting>
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<![CDATA[
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error message: E11000 duplicate key error index: foo.bar.$_id_ dup key: { : 1 }
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error code: 11000
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]]>
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</programlisting>
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Note that the MongoDB error code (11000) is used for the PHP error code. The
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PHP driver uses the "native" error code wherever possible.
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</para>
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<para>
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The following is a list of common errors, codes, and causes. Exact errors
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are in italics, errors where the message can vary are described in obliques.
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</para>
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<itemizedlist>
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<listitem>
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<para>
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<literal>cannot modify cursor after beginning iteration</literal>
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</para>
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<para>
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Code: 0
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</para>
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<para>
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You are calling a method that sets up the query after executing the query.
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Reset the cursor and try again.
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</para>
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<para>
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An example:
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<programlisting role="php">
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<![CDATA[
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<?php
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try {
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$cursor = $collection->find();
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var_dump($cursor->getNext());
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// getNext() queried the database, it's too late to set a limit
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$cursor->limit(1);
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}
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catch (MongoCursorException $e) {
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echo "error message: ".$e->getMessage()."\n";
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echo "error code: ".$e->getCode()."\n";
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}
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// this will work, though:
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$cursor->getNext();
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$cursor->reset();
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$cursor->limit(1);
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?>
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]]>
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</programlisting>
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</para>
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</listitem>
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<listitem>
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<para>
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Get next batch send errors
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</para>
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<para>
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Code: 1
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</para>
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<para>
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Could not send the query to the database. Make sure the database is
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still up and the network is okay.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>cursor not found</literal>
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</para>
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<para>
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Code: 2
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</para>
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<para>
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The driver was trying to fetch more results from the database, but the
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database did not have a record of the query. This usually means that the
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cursor timed out on the server side: after a few minutes of inactivity,
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the database will kill a cursor (see
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<function>MongoCursor::immortal</function> for information on preventing
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this).
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</para>
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<para>
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An example:
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<programlisting role="php">
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<![CDATA[
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<?php
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try {
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$cursor = $collection->find();
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$cursor->getNext();
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// sleep for 15 minutes
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sleep(60*15);
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while ($cursor->hasNext()) {
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$cursor->getNext();
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}
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}
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catch (MongoCursorException $e) {
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echo "error message: ".$e->getMessage()."\n";
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echo "error code: ".$e->getCode()."\n";
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}
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?>
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]]>
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</programlisting>
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>cursor->buf.pos is null</literal>
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</para>
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<para>
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Code: 3
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</para>
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<para>
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This may indicate you are out of RAM or some other extraordinary
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circumstance.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>couldn't get response header</literal>
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</para>
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<para>
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Code: 4
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</para>
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<para>
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A common error if the database or network goes down. This means that the
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driver couldn't get a response from the connection.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>no db response</literal>
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</para>
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<para>
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Code: 5
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</para>
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<para>
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This may not even be an error, for example, the database command
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"shutdown" returns no response. However, if you were expecting a
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response, this means the database didn't give one.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>bad response length: %d, did the db assert?</literal>
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</para>
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<para>
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Code: 6
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</para>
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<para>
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This means that the database said that its response was less than 0. This
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error probably indicates a network error or database corruption.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>incomplete header</literal>
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</para>
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<para>
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Code: 7
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</para>
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<para>
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Highly unusual. Occurs if the database response started out correctly,
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but broke off in the middle. Probably indicates a network problem.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>incomplete response</literal>
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</para>
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<para>
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Code: 8
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</para>
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<para>
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Highly unusual. Occurs if the database response started out correctly,
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but broke off in the middle. Probably indicates a network problem.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>couldn't find a response</literal>
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</para>
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<para>
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Code: 9
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</para>
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<para>
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If the response was cached and now cannot be located.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>error getting socket</literal>
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</para>
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<para>
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Code: 10
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</para>
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<para>
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The socket was closed or encountered an error. The driver should
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automatically reconnect (if possible) on the next operation.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>couldn't find reply, please try again</literal>
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</para>
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<para>
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Code: 11
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</para>
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<para>
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The driver saves any database responses it cannot immediately match with a
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request. This exception occurs if the driver has already passed your
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request's response and cannot find your response in its cache.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>error getting database response: errstr</literal>
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</para>
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<para>
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<literal>WSA error getting database response: errstr</literal>
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</para>
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<para>
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"errstr" is an io error reported directly from the C socket
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subsystem. On Windows, the error message is prefixed with "WSA".
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>Timeout error</literal>
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</para>
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<para>
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Code: 13
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</para>
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<para>
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If there was an error while waiting for a query to complete.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>couldn't send query: <various></literal>
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</para>
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<para>
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Code: 14
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</para>
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<para>
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C socket error on send.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>max number of retries exhausted, couldn't send query</literal>
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</para>
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<para>
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Code: 19
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</para>
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<para>
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The driver will automatically retry "plain" queries (not commands) a
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couple of times if the first attempt failed for certain reasons. This is
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to cause fewer exceptions during replica set failover (although you will
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probably still have to deal with some) and gloss over transient network
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issues.
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</para>
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<para>
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This can also be caused by the driver not being able to reconnect at all
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to the database (if, for example, the database is unreachable).
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</para>
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<para>
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Version 1.2.2+.
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</para>
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</listitem>
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</itemizedlist>
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</section>
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<section>
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<title>Errors passed through by the database</title>
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<para>
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Database errors should always trigger
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<classname>MongoCursorExceptions</classname> on queries.
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Error messages and codes are sent directly from the database and you should
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be able to see matching errors in the database log.
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</para>
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<para>
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A few common database errors are listed below:
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</para>
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<itemizedlist>
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<listitem>
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<para>
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<literal>E11000 duplicate key error index: foo.bar.$X dup key: { /* ... */ }</literal>
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</para>
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<para>
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Code: 11000
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</para>
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<para>
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Database error for duplicate keys.
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</para>
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</listitem>
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<listitem>
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<para>
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<literal>not master</literal>
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</para>
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<para>
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Codes: 10107, 13435, and 10058
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</para>
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<para>
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Not master errors, piped through by the database. Each of these will
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cause the driver to disconnect and attempt to find a new master. The
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actual error you get on failover may not be a "not master" error,
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depending on when the change in master occurs.
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</para>
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</listitem>
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</itemizedlist>
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</section>
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<!-- }}} -->
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<section xml:id="mongocursorexception.synopsis">
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&reftitle.classsynopsis;
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<!-- {{{ Synopsis -->
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<classsynopsis>
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<ooclass><classname>MongoCursorException</classname></ooclass>
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<!-- {{{ Class synopsis -->
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<classsynopsisinfo>
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<ooclass>
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<modifier>extends</modifier>
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<classname>MongoException</classname>
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</ooclass>
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</classsynopsisinfo>
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<!-- }}} -->
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</classsynopsis>
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<!-- }}} -->
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</section>
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</partintro>
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</phpdoc:classref>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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