MongoCollection::find
(PECL mongo >=0.9.0)
MongoCollection::find — Querys this collection, returning a MongoCursor for the result set
Beskrivelse
Parametre
-
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.
AdvarselPlease make sure that for all special query operators (starting with $) you use single quotes so that PHP doesn't try to replace "$exists" with the value of the variable $exists.
-
fields -
Fields of the results to return. The array is in the format array('fieldname' => true, 'fieldname2' => true). The _id field is always returned.
Returnerings Værdier
Returns a cursor for the search results.
Eksempler
Eksempel #1 MongoCollection::find() example
This example demonstrates how to search for a range.
<?php
$m = new Mongo();
$db = $m->selectDB('test');
$collection = new MongoCollection($db, 'phpmanual');
// search for documents where 5 < x < 20
$rangeQuery = array('x' => array( '$gt' => 5, '$lt' => 20 ));
$cursor = $collection->find($rangeQuery);
foreach ($cursor as $doc) {
var_dump($doc);
}
?>
The above example will output:
array(2) {
["_id"]=>
object(MongoId)#10 (1) {
["$id"]=>
string(24) "4ebc3e3710b89f2349000000"
}
["x"]=>
int(12)
}
array(2) {
["_id"]=>
object(MongoId)#11 (1) {
["$id"]=>
string(24) "4ebc3e3710b89f2349000001"
}
["x"]=>
int(12)
}
See MongoCursor for more information how to work with cursors.
Eksempel #2 MongoCollection::find() example using $where
This example demonstrates how to search a collection using javascript code to reduce the resultset.
<?php
$m = new Mongo();
$db = $m->selectDB('test');
$collection = new MongoCollection($db, 'phpmanual');
$js = "function() {
return this.name == 'Joe' || this.age == 50;
}";
$cursor = $collection->find(array('$where' => $js));
foreach ($cursor as $doc) {
var_dump($doc);
}
?>
The above example will output:
array(3) {
["_id"]=>
object(MongoId)#7 (1) {
["$id"]=>
string(24) "4ebc3e3710b89f2349000002"
}
["name"]=>
string(3) "Joe"
["age"]=>
int(20)
}
Eksempel #3 MongoCollection::find() example using $in
This example demonstrates how to search a collection using the $in operator.
<?php
$m = new Mongo();
$db = $m->selectDB('test');
$collection = new MongoCollection($db, 'phpmanual');
$cursor = $collection->find(array(
'name' => array('$in' => array('Joe', 'Wendy'))
));
?>
The above example will output:
array(3) {
["_id"]=>
object(MongoId)#7 (1) {
["$id"]=>
string(24) "4ebc3e3710b89f2349000002"
}
["name"]=>
string(3) "Joe"
["age"]=>
int(20)
}
Eksempel #4 Getting results as an array
This returns a MongoCursor. Often, when people are starting out, they are more comfortable using an array. To turn a cursor into an array, use the iterator_to_array() function.
<?php
$m = new Mongo();
$db = $m->selectDB('test');
$collection = new MongoCollection($db, 'phpmanual');
$cursor = $collection->find();
$array = iterator_to_array($cursor);
?>
The above example will output:
array(3) {
["4ebc40af10b89f5149000000"]=>
array(2) {
["_id"]=>
object(MongoId)#6 (1) {
["$id"]=>
string(24) "4ebc40af10b89f5149000000"
}
["x"]=>
int(12)
}
["4ebc40af10b89f5149000001"]=>
array(2) {
["_id"]=>
object(MongoId)#11 (1) {
["$id"]=>
string(24) "4ebc40af10b89f5149000001"
}
["x"]=>
int(12)
}
["4ebc40af10b89f5149000002"]=>
array(3) {
["_id"]=>
object(MongoId)#12 (1) {
["$id"]=>
string(24) "4ebc40af10b89f5149000002"
}
["name"]=>
string(3) "Joe"
["age"]=>
int(20)
}
}
Using iterator_to_array() forces the driver to load all of the results into memory, so do not do this for result sets that are larger than memory!
Also, certain system collections do not have an _id
field. If you are dealing with a collection that might have documents
without _ids, pass FALSE as the second argument to
iterator_to_array() (so that it will not try to use the
non-existent _id values as keys).
Se også
- MongoCollection::findOne() - Querys this collection, returning a single element
- MongoCollection::insert() - Inserts an array into the collection
- MongoDB core docs on » find.
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