MongoCollection::ensureIndex

(PECL mongo >=0.9.0)

MongoCollection::ensureIndex — Creates an index on the specified field(s) if it does not already exist

说明

public MongoCollection::ensureIndex ( string|array $key|keys [, array $options = array() ] ) : bool
Warning

This method is deprecated since version 1.5.0. Please use MongoCollection::createIndex() instead.

Creates an index on the specified field(s) if it does not already exist. Fields may be indexed with a direction (e.g. ascending or descending) or a special type (e.g. text, geospatial, hashed).

Note:

This method will use the » createIndexes database command when communicating with MongoDB 2.6+. For previous database versions, the method will perform an insert operation on the special system.indexes collection.

参数

keys

An array specifying the index's fields as its keys. For each field, the value is either the index direction or » index type. If specifying direction, specify 1 for ascending or -1 for descending.

options

An array of options for the index creation. Currently available options include:

  • "unique"

    Specify TRUE to create a unique index. The default value is FALSE. This option applies only to ascending/descending indexes.

    Note:

    When MongoDB indexes a field, if a document does not have a value for the field, a NULL value is indexed. If multiple documents do not contain a field, a unique index will reject all but the first of those documents. The "sparse" option may be used to overcome this, since it will prevent documents without the field from being indexed.

  • "sparse"

    Specify TRUE to create a sparse index, which only indexes documents containing a specified field. The default value is FALSE.

  • "expireAfterSeconds"

    The value of this option should specify the number of seconds after which a document should be considered expired and automatically removed from the collection. This option is only compatible with single-field indexes where the field will contain MongoDate values.

    Note:

    This feature is available in MongoDB 2.2+. See » Expire Data from Collections by Setting TTL for more information.

  • "name"

    A optional name that uniquely identifies the index.

    Note:

    By default, the driver will generate an index name based on the index's field(s) and ordering or type. For example, a compound index array("x" => 1, "y" => -1) would be named "x_1_y_-1" and a geospatial index array("loc" => "2dsphere") would be named "loc_2dsphere". For indexes with many fields, it is possible that the generated name might exceed MongoDB's » limit for index names. The "name" option may be used in that case to supply a shorter name.

  • "background"

    Builds the index in the background so that building an index does not block other database activities. Specify TRUE to build in the background. The default value is FALSE.

    Warning

    Prior to MongoDB 2.6.0, index builds on secondaries were executed as foreground operations, irrespective of this option. See » Building Indexes with Replica Sets for more information.

  • "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).

The following option may be used with MongoDB 2.6+:

  • "maxTimeMS"

    Specifies a cumulative time limit in milliseconds for processing the operation on the server (does not include idle time). If the operation is not completed by the server within the timeout period, a MongoExecutionTimeoutException will be thrown.

The following options may be used with MongoDB versions before 2.8:

  • "dropDups"

    Specify TRUE to force creation of a unique index where the collection may contain duplicate values for a key. MongoDB will index the first occurrence of a key and delete all subsequent documents from the collection that contain a duplicate value for that key. The default value is FALSE.

    Warning

    "dropDups" may delete data from your database. Use with extreme caution.

    Note:

    This option is not supported on MongoDB 2.8+. Index creation will fail if the collection contains duplicate values.

The following options may be used with MongoDB versions before 2.6:

  • "w"

    See WriteConcerns. 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 WriteConcern w option.

  • "timeout"

    Integer, defaults to MongoCursor::$timeout. If "safe" is set, this sets how long (in milliseconds) for the client to wait for a database response. If the database does not respond within the timeout period, a MongoCursorTimeoutException will be thrown.

  • "wtimeout"

    Deprecated alias for "wTimeoutMS".

返回值

Returns an array containing the status of the index creation. The array contains whether the operation succeeded ("ok"), the number of indexes before and after the operation ("numIndexesBefore" and "numIndexesAfter"), and whether the collection that the index belongs to has been created ("createdCollectionAutomatically"). If the index already existed and did not need to be created, a "note" field may be present in lieu of "numIndexesAfter".

With MongoDB 2.4 and earlier, a status document is only returned if the write concern is at least 1. Otherwise, TRUE is returned. The fields in the status document are different, except for the "ok" field, which signals whether the index creation was successful. Additional fields are described in the documentation for MongoCollection::insert().

更新日志

版本 说明
1.5.0

Renamed the "wtimeout" option to "wTimeoutMS". Emits E_DEPRECATED when "wtimeout" is used.

Renamed the "timeout" option to "socketTimeoutMS". Emits E_DEPRECATED when "timeout" is used.

Emits E_DEPRECATED when "safe" is used.

1.3.4 Added "wtimeout" option.
1.3.0

Added "w" option.

The options parameter no longer accepts a boolean to signify a unique index. Instead, this now has to be done with array('unique' => true).

1.2.11 Emits E_DEPRECATED when options is scalar.
1.2.0 Added "timeout" option.
1.0.11

The "safe" option will trigger a primary failover, if necessary.

MongoException will be thrown if the index name (either generated or set) is longer than 128 bytes.

1.0.5 Added the "name" option to override index name creation.
1.0.2 Changed options parameter from boolean to array. Pre-1.0.2, the second parameter was an optional boolean value specifying a unique index.

错误／异常

Throws MongoException if the index name is longer than 128 bytes, or if the index specification is not an array.

Throws MongoDuplicateKeyException if the server could not create the unique index due to conflicting documents.

Throws MongoResultException if the server could not create the index due to an 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.

范例

Example #1 MongoCollection::ensureIndex() example

<?php

$c = new MongoCollection($db, 'foo');

// create an index on 'x' ascending
$c->ensureIndex(array('x' => 1));

// create a unique index on 'y'
$c->ensureIndex(array('y' => 1), array('unique' => true));

// create a compound index on 'za' ascending and 'zb' descending
$c->ensureIndex(array('za' => 1, 'zb' => -1));

?>

Example #2 Geospatial Indexing

Mongo supports geospatial indexes, which allow you to search for documents near a given location or within a shape. The following example creates a geospatial index on the "loc" field:

<?php

$collection->ensureIndex(array('loc' => '2dsphere'));

?>

Example #3 Drop duplicates example

<?php

$collection->insert(array('username' => 'joeschmoe'));
$collection->insert(array('username' => 'joeschmoe'));

/* Index creation fails, since you cannot create a unique index on a field when
 * duplicates exist.
 */
$collection->ensureIndex(array('username' => 1), array('unique' => 1));

/* MongoDB will one of the conflicting documents and allow the unique index to
 * be created.
 */
$collection->ensureIndex(array('username' => 1), array('unique' => 1, 'dropDups' => 1));

/* We now have a unique index and subsequent inserts with the same username will
 * fail.
 */
$collection->insert(array('username' => 'joeschmoe'));

?>

参见

相关文章
php domnode checks if the specified namespaceuri is the default namespace or notphp cubrid mysql 兼容性函数 return the name of the specified field indexphp sqlite 函数 opens an sqlite database and create the database if it does not existphp sqlite 函数 opens a persistent handle to an sqlite database and create the database if it does not existphp svn 函数 creates a new empty directory returns true if all is ok false otherwisephp svn 函数 creates a new empty file returns true if all is ok false otherwisephp trader 函数 index of lowest value over a specified periodphp wincache 函数 adds a variable in user cache only if variable does not already exist in the cachephp wincache 函数 adds a variable in user cache and overwrites a variable if it already exists in the cachephp harudoc load the font with the specified index from ttc filephp imagick returns the color of the specified colormap indexphp mongocollection creates an index on the specified field s if it does not already existphp mongocollection creates an index on the specified field s if it does not already existphp mongocollection update a document and return itphp normalizer checks if the provided string is already in the specified normalization formphp pharfileinfo returns crc32 code or throws an exception if crc has not been verifiedphp recursivearrayiterator returns an iterator for the current entry if it is an array or an objectphp solrdocument checks if a field existsphp solrinputdocument checks if a field existsphp swoole lock try to acquire the lock. it will block if the lock is not available.
关注编程学问公众号