MongoDB and PHP extensions to add, modify, query, delete, and other basic courses of Operation ____php

Link Database
Use the following code to create a database link <?php
$connection = new Mongo (); Link to localhost:27017
$connection = new Mongo ("example.com"); Link to remote host (default port)
$connection = new Mongo ("example.com:65432"); Custom ports linked to remote hosts
?> Now you can use the $connection link to manipulate the database.
Select Database
Use the following code to select a database <?php
$db = $connection->dbname;
?> here the database is not necessarily an existing database, if the selected database does not exist, you will create a new database, so when you select the database, be sure to fill in the correct database name
If you spell incorrectly, you will likely create a new database <?php
$db = $connection->mybiglongdbname;
Do some things
$db = $connection->mybiglongdbnme;
You will now connect to a new database
?>
Gets a collection
Gets a collection that has the same syntax format as the Select Database <?php
$db = $connection->baz;//Select database
$collection = $db->foobar;//Select Foobar Collection
Or use a more concise approach.
$collection = $connection->baz->foobar;
?>
Insert a document
Multidimensional arrays are basic units that can be stored in a database
A random document might be like this
<?php $doc = Array (
"Name" => "MongoDB",
"Type" => "database",
"Count" => 1,
"Info" => (object) Array ("X" => 203,
"Y" => 102),
"Versions" => Array ("0.9.7″," 0.9.8″, "0.9.9″")
);
?>
Note: You can nest arrays and objects, objects and documents are almost the same in MongoDB, you can use $doc to invoke a document or object, but the info field is always an object rather than a document,
This constraint applies to all documents using Mongocollection::insert () to insert a document
<?php
$m = new Mongo ();
$collection = $m->foo->bar;
$collection->insert ($doc);
?> use Mongocollection::findone () to query documents
In order to prove that the above code data has been inserted into the database, we do a simple findone () operation to get the first document data in the collection, this method returns only one document data,
This approach applies to matching only one document at the time of your query, or you only care about the first piece of data <?php
$obj = $collection->findone ();
Var_dump ($obj);
?>
You will see the following results
Array (5) {
["_id"]=>
Object (mongoid) #6 (0) {
}
[' Name ']
String (7) "MongoDB"
[' Type ']=>
String (8) "Database"
[' Count ']=>
Int (1)
["Info"]=>
Array (2) {
["X"]=>
Int (203)
["Y"]=>
Int (102)
}
["Versions"]
Array (3) {
[0]=>
String (5) "0.9.7″
[1]=>
String (5) "0.9.8″
[2]=>
String (5) "0.9.9″
}
Note that the _id field is automatically loaded on the document, and that the MongoDB storage element starts with _ and $ for internal use
Add more Documents
To do something more interesting, we add more simple documents to the collection, which are as follows
<?php
Array ("I" => value);
?> we can use loops to insert data fairly efficiently
<?php
For ($i =0 $i <100; $i + +) {
$collection->insert (Array ("I" => $i));
}
?>
Note: We can insert different fields in the same character set, which means that MongoDB has a very free storage mode to calculate the number of documents in a collection
Now that we've inserted 101 documents (we've inserted 100 in a loop, we've inserted one before), we can use count () to see if our data is plugged in.
<?php
echo $collection->count ();
?>
This code will print out 101
Mongocollection::count () can also query field data
Use cursors to get all documents in the collection
To get all the documents in the collection, we can use the Mongocollection::find () method, and the Find () method returns a Mongocursor object, allowing us to repeat the query
The document that matches
<?php
$cursor = $collection->find ();
foreach ($cursor as $id => $value) {
echo "$id:";
Var_dump ($value);
}
?>
This will print out the 101 documents in the collection, $id is the _id field in the document, $value is the document itself
Set a standard for a query
We can get a subset of the documents in the collection by using the Find () method, for example, to query the document with the I field 71 in the collection, we can use the following methods
<?php $query = Array ("I" => 71);
$cursor = $collection->find ($query);
while ($cursor->hasnext ()) {
Var_dump ($cursor->getnext ());
}
?>
We will print the following data
Array (2) {
["_id"]=>
Object (mongoid) #6 (0) {
}
["I"]=>
Int (71)
["_ns"]=>
"Testcollection"
}

Set a range for a query
We can create a query statement by using Find () to get a subset of the collection, for example, if we get all the "I" >50 documents, we can use the following code
<?php
$query = Array ("I" => Array (' $GT ' =>50)); Note the single quotes on both sides of the ' $gt '
$cursor = $coll->find ($query); while ($cursor->hasnext ()) {
Var_dump ($cursor->getnext ());
}
?>
We can also get the data between < I <= 30
<?php
$query = Array ("I" => array ("\ $gt" =>, "\ $lte" => 30));
$cursor = $coll->find ($query); while ($cursor->hasnext ()) {
Var_dump ($cursor->getnext ());
}
?> we are very apt to miss the $ dollar sign, you can also choose your custom symbol to replace the dollar sign, and choose a symbol that will not appear in your build such as ":" and add a word to the php.ini
Mongo.cmd = ":"
Then the code above can be replaced with
<?php
$query = Array ("I" => Array (": GT" =>, ": LTE" => 30));
?>
Of course you can also use the Ini_set ("Mongo.cmd", ":") method to change
Create an index
MongoDB supports indexing and can easily be added to a set, you just specify that a field is indexed, and you can also specify a positive sequence index (1) and a descending index (-1)
The following code creates an index for I
<?php
$coll->ensureindex (Array ("I" => 1)); An index was created on "I"
$coll->ensureindex (Array ("I" =>-1, "J" => 1))//Reverse index created on "I" creates a positive index on "J"
?> a simple one.
This example shows how to link the MongoDB database, how to select the database, how to insert the data, how to query the data, and close the database link <?php
Link
$m = new Mongo ();

Select a database
$db = $m->comedy;
$collection = $db->cartoons;

Add an Element
$obj = Array ("title" => "Calvin and Hobbes", "Author" => "Bill Watterson");
$collection->insert ($obj);

Add another element, using a different format
$obj = Array ("title" => "XKCD", "online" => true);
$collection->insert ($obj);

To query all collections
$cursor = $collection->find ();

Show results repeatedly
foreach ($cursor as $obj) {
echo $obj ["title"]. " ";
}

Close link
$m->close ();
?> output is
Calvin and Hobbes
XKCD