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MongoCollection::insert
Inserts a document into the collection
Description
public bool|array MongoCollection::insert
( array|object $document
[, array $options = array()
] )
Parameters
-
document
-
An array or object. If an object is used, it may not have protected or
private properties.
Note:
If the parameter does not have an _id key or
property, a new MongoId instance will be created
and assigned to it. This special behavior does not mean that the
parameter is passed by reference.
-
options
-
An array of options for the insert operation. Currently available options
include:
"fsync" Boolean, defaults to FALSE. If journaling is enabled, it works exactly like "j". If journaling is not enabled, the write operation blocks until it is synced to database files on disk. If TRUE, an acknowledged insert is implied and this option will override setting "w" to 0. Note: If journaling is enabled, users are strongly encouraged to use the "j" option instead of "fsync". Do not use "fsync" and "j" simultaneously, as that will result in an error.
"j" Boolean, defaults to FALSE. Forces the write operation to block until it is synced to the journal on disk. If TRUE, an acknowledged write is implied and this option will override setting "w" to 0. Note: If this option is used and journaling is disabled, MongoDB 2.6+ will raise an error and the write will fail; older server versions will simply ignore the option.
"socketTimeoutMS" This option specifies the time limit, in milliseconds, for socket communication. If the server does not respond within the timeout period, a MongoCursorTimeoutException will be thrown and there will be no way to determine if the server actually handled the write or not. A value of -1 may be specified to block indefinitely. The default value for MongoClient is 30000 (30 seconds). "w" See Write Concerns. The default value for MongoClient is 1. "wTimeoutMS" This option specifies the time limit, in milliseconds, for write concern acknowledgement. It is only applicable when "w" is greater than 1, as the timeout pertains to replication. If the write concern is not satisfied within the time limit, a MongoCursorException will be thrown. A value of 0 may be specified to block indefinitely. The default value for MongoClient is 10000 (ten seconds).
The following options are deprecated and should no longer be used:
"safe" Deprecated. Please use the write concern "w" option. "timeout" Deprecated alias for "socketTimeoutMS". "wtimeout" Deprecated alias for "wTimeoutMS".
Return Values
Returns an array containing the status of the insertion if the
"w" option is set. Otherwise, returns TRUE if the
inserted array is not empty (a MongoException will be
thrown if the inserted array is empty).
If an array is returned, the following keys may be present:
-
ok
-
This should almost always be 1 (unless last_error itself failed).
-
err
-
If this field is non-null, an error occurred on the previous operation.
If this field is set, it will be a string describing the error that
occurred.
-
code
-
If a database error occurred, the relevant error code will be passed
back to the client.
-
errmsg
-
This field is set if something goes wrong with a database command. It
is coupled with ok being 0. For example, if
w is set and times out, errmsg will be set to "timed
out waiting for slaves" and ok will be 0. If this
field is set, it will be a string describing the error that occurred.
-
n
-
If the last operation was an update, upsert, or a remove, the number
of documents affected will be returned. For insert operations, this value
is always 0.
-
wtimeout
-
If the previous option timed out waiting for replication.
-
waited
-
How long the operation waited before timing out.
-
wtime
-
If w was set and the operation succeeded, how long it took to
replicate to w servers.
-
upserted
-
If an upsert occurred, this field will contain the new record's
_id field. For upserts, either this field or
updatedExisting will be present (unless an error
occurred).
-
updatedExisting
-
If an upsert updated an existing element, this field will be true. For
upserts, either this field or upserted will be present (unless an error
occurred).
Errors/Exceptions
Throws MongoException if the inserted document is
empty or if it contains zero-length keys. Attempting to insert an object with
protected and private properties will cause a zero-length key error.
Throws MongoCursorException if the "w" option is set and the write fails. Throws MongoCursorTimeoutException if the "w" option is set to a value greater than one and the operation takes longer than MongoCursor::$timeout milliseconds to complete. This does not kill the operation on the server, it is a client-side timeout. The operation in MongoCollection::$wtimeout is milliseconds.
Examples
Example #1 MongoCollection::insert _id example
An _id field will be added to the inserted document if
not already present. Depending on how the parameter is passed, a generated
_id may or may not be available to calling code.
<?php
$m = new MongoClient();
$collection = $m->selectCollection('test', 'phpmanual');
// If an array literal is used, there is no way to access the generated _id
$collection->insert(array('x' => 1));
// The _id is available on an array passed by value
$a = array('x' => 2);
$collection->insert($a);
var_dump($a);
// The _id is not available on an array passed by reference
$b = array('x' => 3);
$ref = &$b;
$collection->insert($ref);
var_dump($ref);
// The _id is available if a wrapping function does not trigger copy-on-write
function insert_no_cow($collection, $document)
{
$collection->insert($document);
}
$c = array('x' => 4);
insert_no_cow($collection, $c);
var_dump($c);
// The _id is not available if a wrapping function triggers copy-on-write
function insert_cow($collection, $document)
{
$document['y'] = 1;
$collection->insert($document);
}
$d = array('x' => 5);
insert_cow($collection, $d);
var_dump($d);
?>
The above example will output
something similar to:
array(2) {
["x"]=>
int(2)
["_id"]=>
object(MongoId)#4 (0) {
}
}
array(1) {
["x"]=>
int(3)
}
array(2) {
["x"]=>
int(4)
["_id"]=>
object(MongoId)#5 (0) {
}
}
array(1) {
["x"]=>
int(5)
}
Example #2 MongoCollection::insert acknowledged write example
This example shows inserting two elements with the same _id, which causes
a MongoCursorException to be thrown, as
w was set.
<?php
$person = array("name" => "Joe", "age" => 20);
$collection->insert($person);
// now $person has an _id field, so if we save it
// again, we will get an exception
try {
$collection->insert($person, array("w" => 1));
} catch(MongoCursorException $e) {
echo "Can't save the same person twice!\n";
}
?>
See Also
- MongoCollection::batchInsert
- MongoCollection::update
- MongoCollection::find
- MongoCollection::remove
- MongoDB core docs on » insert.
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