Database Reference
In-Depth Information
// Options
$options = array("upsert" => true);
// Perform the update
$collection->update($criteria,$update,$options);
Changing the Value of a Key with $set
The
$set
operator lets you change the value of a key while ignoring any other fields. As noted previously, this would
have been a much better choice for updating Victoria's first name to
"Vicky"
in the earlier example. The following
example shows how to use the
$set
operator to change the contact's name to
"Vicky"
:
// Connect to the database
$c = new MongoClient();
// Select the collection 'people' from the database 'contacts'
$collection = $c->contacts->people;
// Specify the search criteria
$criteria = array("Last Name" => "Wood");
// Specify the information to be changed
$update = array('$set' => array("First Name" => "Vicky"));
// Options
$options = array("upsert" => true);
// Perform the update
$collection->update($criteria,$update,$options);
You can also use
$set
to add a field for every occurrence found matching your query:
// Connect to the database
$c = new MongoClient();
// Select the collection 'people' from the database 'contacts'
$collection = $c->contacts->people;
// Specify the search criteria using regular expressions
$criteria = array("E-Mail" => new MongoRegex("
/@office.com/i
"));
// Add "Category => Work" into every occurrence found
$update = array('$set' => array('Category' => 'Work'));
// Options
$options = array('upsert' => true, 'multi' => true);
// Perform the upsert via save()
$collection->update($criteria,$update,$options);
Deleting a Field with $unset
The
$unset
operator works similarly to the
$set
operator. The difference is that
$unset
lets you delete a given field
from a document. For instance, the following example removes the
Phone
field and its associated data from the
contact information for Victoria Wood:
// Connect to the database
$c = new MongoClient();
// Select the collection 'people' from the database 'contacts'
$collection = $c->contacts->people;
