Object MongoCollection

mongodb database data set object

use MongoDB.getCollection create:

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var col1 = mdb.getCollection('test');
var col = mdb.test;

Inheritance

Operator

operator[String]

Quickly get the collection object of the current collection sub-namespace by attribute

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readonly MongoCollection MongoCollection[String];

Return result:

• Return new collection object

Member function

find

Create a cursor object according to the given query conditions and return field settings

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MongoCursor MongoCollection.find(Object query = {},
    Object projection = {});

Call parameters:

• query: Object, the object that specifies the query condition
• projection: Object, specify the object of the returned field

Return result:

• MongoCursor, Return the cursor object

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findOne

According to the given query conditions and return field settings, query a result

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Object MongoCollection.findOne(Object query = {},
    Object projection = {});

Call parameters:

• query: Object, the object that specifies the query condition
• projection: Object, specify the object of the returned field

Return result:

• Object, Returns the first result

---

findAndModify

Query and modify

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Object MongoCollection.findAndModify(Object query);

Call parameters:

• query: Object, specify query conditions, modify data

Return result:

• Object, Return the result before modification and other information

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insert

Insert a set of data

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MongoCollection.insert(Array documents);

Call parameters:

• documents: Array, specify the data array to be inserted

---

Insert a piece of data

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MongoCollection.insert(Object document);

Call parameters:

• document: Object, specify the data to be inserted

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save

Save a piece of data, if the data contains the _id field, it is an update, otherwise it is an insert

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MongoCollection.save(Object document);

Call parameters:

• document: Object, specify the data to be saved

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update

Update the data according to the given query conditions

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MongoCollection.update(Object query,
    Object document,
    Boolean upsert = false,
    Boolean multi = false);

Call parameters:

• query: Object, the object that specifies the query condition
• document: Object, specify the data to be updated
• upsert: Boolean, when the data does not exist, insert a new data, the default is false, do not insert
• multi: Boolean, when more than one piece of data meets the condition, update all data, the default is false, only update the first one

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Update the data according to the given query conditions

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MongoCollection.update(Object query,
    Object document,
    Object options);

Call parameters:

• query: Object, the object that specifies the query condition
• document: Object, specify the data to be updated
• options: Object, upsert and multi options passed as object fields

---

remove

Delete data according to the given query conditions

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MongoCollection.remove(Object query);

Call parameters:

• query: Object, the object that specifies the query condition

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runCommand

Execute database commands

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Object MongoCollection.runCommand(Object cmd);

Call parameters:

• cmd: Object, the given command object

Return result:

• Object, Return command to return result

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Execute database commands

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Object MongoCollection.runCommand(String cmd,
    Object arg = {});

Call parameters:

• cmd: String, given command name
• arg: Object, given command parameter options

Return result:

• Object, Return command to return result

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drop

Delete the current collection

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MongoCollection.drop();

---

ensureIndex

Create an index on the current collection

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MongoCollection.ensureIndex(Object keys,
    Object options = {});

Call parameters:

• keys: Object, given index field, order and direction
• options: Object, options for a given index, unique index, etc.

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reIndex

Rebuild the index of the current collection

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Object MongoCollection.reIndex();

Return result:

• Object, Return command execution result

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dropIndex

Delete the index of the specified name of the current collection

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Object MongoCollection.dropIndex(String name);

Call parameters:

• name: String, given the name of the index to be deleted

Return result:

• Object, Return command execution result

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dropIndexes

Delete all indexes of the current collection

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Object MongoCollection.dropIndexes();

Return result:

• Object, Return command execution result

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getIndexes

Query all indexes of the current collection

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Array MongoCollection.getIndexes();

Return result:

• Array, Returns the result set containing the index

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getCollection

Get the collection object of the current collection sub-namespace

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MongoCollection MongoCollection.getCollection(String name);

Call parameters:

• name: String, sub-namespace name

Return result:

• MongoCollection, Return the new collection object

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toString

Returns the string representation of the object, generally returns "[Native Object]", the object can be re-implemented according to its own characteristics

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String MongoCollection.toString();

Return result:

• String, Returns the string representation of the object

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toJSON

Returns the JSON format representation of the object, generally returns a collection of readable attributes defined by the object

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Value MongoCollection.toJSON(String key = "");

Call parameters:

• key: String, unused

Return result:

• Value, Returns a value containing JSON serializable