example of sort and find
$client = new MongoDB\Client("mongodb://localhost:27017");
$product = $client->db->product;
$filter = [];
$options = ['sort' => ['catid' => 1], 'limit' => 10];
$list = $product->find($filter, $options);
$query = array()
[, array $fields = array()
]] ) : MongoCursor
query
要搜索的字段。 MongoDB 的查询语言十分宽泛。 PHP 驱动在几乎所有的情况下会把查询直接传入服务器，所以阅读 MongoDB 关于 » find 的核心文档是个不错的主意。
请确保所有指定的查询操作符（以 $ 开头）是用单引号的，这样 PHP 才不会尝试用 $exists 变量的值来替换 "$exists" 命令。
fields
返回结果的字段。Array 的格式是 array('fieldname' => true, 'fieldname2' => true)。 _id 字段总会返回。
返回搜索结果的游标。
Example #1 MongoCollection::find() 例子
该例子演示了基本的搜索选项。
<?php
$m = new MongoClient();
$db = $m->selectDB('test');
$collection = new MongoCollection($db, 'produce');
// 搜索水果
$fruitQuery = array('Type' => 'Fruit');
$cursor = $collection->find($fruitQuery);
foreach ($cursor as $doc) {
var_dump($doc);
}
// 搜索甜的产品 Taste is a child of Details.
$sweetQuery = array('Details.Taste' => 'Sweet');
echo "Sweet\n";
$cursor = $collection->find($sweetQuery);
foreach ($cursor as $doc) {
var_dump($doc);
}
?>
以上例程会输出：
array(4) {
["_id"]=>
object(MongoId)#7 (1) {
["$id"]=>
string(24) "50a87dd084f045a19b220dd6"
}
["Name"]=>
string(5) "Apple"
["Type"]=>
string(5) "Fruit"
["Details"]=>
array(2) {
["Taste"]=>
string(5) "Sweet"
["Colour"]=>
string(3) "Red"
}
}
array(4) {
["_id"]=>
object(MongoId)#8 (1) {
["$id"]=>
string(24) "50a87de084f045a19b220dd7"
}
["Name"]=>
string(5) "Lemon"
["Type"]=>
string(5) "Fruit"
["Details"]=>
array(2) {
["Taste"]=>
string(4) "Sour"
["Colour"]=>
string(5) "Green"
}
}
Sweet:
array(4) {
["_id"]=>
object(MongoId)#7 (1) {
["$id"]=>
string(24) "50a87dd084f045a19b220dd6"
}
["Name"]=>
string(5) "Apple"
["Type"]=>
string(5) "Fruit"
["Details"]=>
array(2) {
["Taste"]=>
string(5) "Sweet"
["Colour"]=>
string(3) "Red"
}
}
更多关于游标如何使用的信息，参见 MongoCursor。
Example #2 MongoCollection::find() 例子
这个例子演示了如何搜索一个范围。
<?php
$m = new MongoClient();
$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);
}
?>
以上例程会输出：
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)
}
更多关于游标如何使用的信息，参见 MongoCursor。
Example #3 使用 $where 的 MongoCollection::find() 例子
这个例子演示了如何搜索一个集合，并用 javascript 代码来筛选结果集。
<?php
$m = new MongoClient();
$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);
}
?>
以上例程会输出：
array(3) {
["_id"]=>
object(MongoId)#7 (1) {
["$id"]=>
string(24) "4ebc3e3710b89f2349000002"
}
["name"]=>
string(3) "Joe"
["age"]=>
int(20)
}
Example #4 使用 $in 的 MongoCollection::find() 例子
这个例子演示了使用 $in 操作符来搜索集合。
<?php
$m = new MongoClient();
$db = $m->selectDB('test');
$collection = new MongoCollection($db, 'phpmanual');
$cursor = $collection->find(array(
'name' => array('$in' => array('Joe', 'Wendy'))
));
?>
以上例程会输出：
array(3) {
["_id"]=>
object(MongoId)#7 (1) {
["$id"]=>
string(24) "4ebc3e3710b89f2349000002"
}
["name"]=>
string(3) "Joe"
["age"]=>
int(20)
}
Example #5 以数组形式获取结果集
返回 MongoCursor。 常常在开始的时候，人们更习惯使用数组。 使用 iterator_to_array() 将游标转换成一个数组。
<?php
$m = new MongoClient();
$db = $m->selectDB('test');
$collection = new MongoCollection($db, 'phpmanual');
$cursor = $collection->find();
$array = iterator_to_array($cursor);
?>
以上例程会输出：
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)
}
}
使用 iterator_to_array() 会让驱动将强制载入所有搜索结果集到内存，所以对超过内存大小的结果集不要这么做！
同时，有些系统集合不具有 _id 字段。
如果你处理一个可能没有 _id 字段的集合，需要将 FALSE 传入
iterator_to_array() 第二个参数（这样它不会尝试使用不存在的 _id 的值作为数组键）。
example of sort and find
$client = new MongoDB\Client("mongodb://localhost:27017");
$product = $client->db->product;
$filter = [];
$options = ['sort' => ['catid' => 1], 'limit' => 10];
$list = $product->find($filter, $options);
As the docs specify, '$or' conditions (and similar) get passed right on to MongoDB directly. It appears that to make a simple "field, $or, field" compound query work, all parts must be wrapped as a gigantic $and.
Here's how I got a find(), findOne(), and findAndModify() to obey such a compound $or for matching on fields, one of which is represented in data as either a string or integer:
<?php
$query =
array('$and' =>
array(
array('assessment_id' => $doc->assessment_id),
array('$or' =>
array(
array('participant_id' => $doc->participant_id),
array('participant_id' => (string)$doc->participant_id),
),
),
array('measure_id' => $doc->measure_id)
),
);
$thedoc = $collection->findOne($query);
return $thedoc;
?>
<?php
$m = new MongoClient();
$db = $m->selectDB('school');
$collection = new MongoCollection($db, 'student');
//Find where class=5
$where=array('class'=>5);
$cursor = $collection->find($where);
//Find where class !=5
$where=array('class' => array('$ne'=>5));
$cursor = $collection->find($where);
//Find where age >20
$where=array('age' => array('$gt'=>20));
$cursor = $collection->find($where);
//Find where age >=20
$where=array('age' => array('$gte'=>20));
$cursor = $collection->find($where);
//Find where age <20
$where=array('age' => array('$le'=>20));
$cursor = $collection->find($where);
//Find where age <=20
$where=array('age' => array('$lte'=>20));
$cursor = $collection->find($where);
//Finc where class=10 or marks=80
$where=array( '$or' => array( array(' class' =>10), array('marks'=>80) ) );
$cursor = $collection->find($where);
//Finc where class=12 AND marks=70
$where=array( '$and' => array( array(' class' =>12), array('marks'=>70) ) );
$cursor = $collection->find($where);
?>
For the fields parameter, the documentaion says: "The _id field is always returned".
Knowing that mongodb allows you to uncheck the _id field ("the _id field is the only field that you can explicitly exclude"; source: http://docs.mongodb.org/manual/reference/method/db.collection.find/#db.collection.find), I tried it with php and it works : you can exclude the _id field.
Example : the following fields parameter will exclude the field "_id"
$fields = array('timestamp' => true, 'rank' => true, '_id' => false);
This will work with versions >=1.5.3, please note that this is just a example of the way to use the or statement.
<?php
$connection = new Mongo();
$db = $connection->test;
$collection = $db->test;
// Clean the DB before the test.
$collection->drop();
$collection = $db->test;
$apple = array(
'fruit' => 'Apple',
'type' => 'Juice',
);
$orange = array(
'fruit' => 'Orange',
'type' => 'Marmalade',
);
$collection->insert($apple);
$collection->insert($orange);
// Basic find
$results = $collection->find(array('fruit' => 'Apple'));
foreach($results as $result)
{
echo sprintf("Fruit: %s, Type: %s%s", $result['fruit'], $result['type'], PHP_EOL);
}
?>
Output:
Fruit: Apple, Type: Juice
Now an advanced search with "or" statement.
<?php
// Advanced find with "OR" note the double array.
// if you use double quotes escape the or "\$or"
$results = $collection->find( array( '$or' => array( array('fruit' => 'Apple'), array('fruit' => 'Orange') ) ) );
foreach($results as $result)
{
echo sprintf("Fruit: %s, Type: %s%s", $result['fruit'], $result['type'], PHP_EOL);
}
?>
Output:
Fruit: Apple, Type: Juice
Fruit: Orange, Type: Marmalade