12-05-2005
Well I'm still not convinced it's because the query's returning nothing. It sounds more like it's returning something the query can't handle, but why not try putting quotes around the variable in the test, ie:-
if [ "$v_flag" ]
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=================================
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LEARN ABOUT PHP
mongocollection.findone
MONGOCOLLECTION.FINDONE(3) 1 MONGOCOLLECTION.FINDONE(3)
MongoCollection::findOne - Queries this collection, returning a single element
SYNOPSIS
public array MongoCollection::findOne ([array $query = array()], [array $fields = array()], [array $options = array()])
DESCRIPTION
As opposed to MongoCollection.find(3), this method will return only the first result from the result set, and not a MongoCursor that can
be iterated over.
PARAMETERS
o $query
- The fields for which to search. MongoDB's query language is quite extensive. The PHP driver will in almost all cases pass the
query straight through to the server, so reading the MongoDB core docs on find is a good idea.
Warning
Please make sure that for all special query operaters (starting with $) you use single quotes so that PHP doesn't try to
replace "$exists" with the value of the variable $exists.
o $fields
- Fields of the results to return. The array is in the format array('fieldname' => true, 'fieldname2' => true). The _id field is
always returned.
o $options
- This parameter is an associative array of the form array("name" => <value>, ...). Currently supported options are:
o "maxTimeMS"Specifies a cumulative time limit in milliseconds for processing the operation (does not include idle time). If
the operation is not completed within the timeout period, a MongoExecutionTimeoutException will be thrown.
RETURN VALUES
Returns record matching the search or NULL.
ERRORS
/EXCEPTIONS
Throws MongoConnectionException if it cannot reach the database.
CHANGELOG
+--------+------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+------------------------------------+
| 1.5.0 | |
| | |
| | Added optional $options argument. |
| | |
+--------+------------------------------------+
EXAMPLES
Example #1
MongoCollection::findOne document by its id.
This example demonstrates how to find a single document in a collection by its id.
<?php
$articles = $mongo->my_db->articles;
$article = $articles->findOne(array('_id' => new MongoId('47cc67093475061e3d9536d2')));
?>
Example #2
MongoCollection::findOne document by some condition.
This example demonstrates how to find a single document in a collection by some condition and limiting the returned fields.
<?php
$users = $mongo->my_db->users;
$user = $users->findOne(array('username' => 'jwage'), array('password'));
print_r($user);
?>
The above example will output something similar to:
Array
(
[_id] => MongoId Object
(
)
[password] => test
)
Notice how even though the document does have a username field, we limited the results to only contain the password field.
SEE ALSO
MongoCollection.find(3), MongoCollection.insert(3), MongoDB core docs on find..
PHP Documentation Group MONGOCOLLECTION.FINDONE(3)