ObjectMongoCollection

mongodb database dataset object

useMongoDB.getCollectioncreate:

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

inheritance relationship

operator

operator[String]

Quickly get the collection object of the current collection sub-namespace in the form of attributes

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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 specifying the query condition
• projection: Object, specifies the object to return the field

return result:

• MongoCursor, returns 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 specifying the query condition
• projection: Object, specifies the object to return the field

return result:

• Object, returns the first result

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findAndModify

query and modify

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Object MongoCollection.findAndModify(Object query);

Call parameters:

• query: Object, specify query conditions and modify data

return result:

• Object, return the result and other information before modification

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insert

Insert a set of data

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MongoCollection.insert(Array documents);

Call parameters:

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

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Insert a piece of data

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MongoCollection.insert(Object document);

Call parameters:

• document: Object, specifies 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, specifies the data to save

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update

Update data based on 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 specifying the query condition
• document: Object, specifies the data to update
• 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 data based on given query conditions

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

Call parameters:

• query: Object, the object specifying the query condition
• document: Object, specifies the data to update
• options: Object, upsert and multi options passed as object fields

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remove

Delete data based on given query conditions

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MongoCollection.remove(Object query);

Call parameters:

• query: Object, the object specifying 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, returns the command to return the result

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Execute database commands

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

Call parameters:

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

return result:

• Object, returns the command to return the result

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drop

delete current collection

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MongoCollection.drop();

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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, returns the command execution result

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dropIndex

Delete the index of the specified name in the current collection

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Object MongoCollection.dropIndex(String name);

Call parameters:

• name: String, given the name of the index to delete

return result:

• Object, returns the 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, returns the 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 a result set containing the index

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getCollection

Get the collection object of the current collection subnamespace

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MongoCollection MongoCollection.getCollection(String name);

Call parameters:

• name: String, subnamespace name

return result:

• MongoCollection, returns a new collection object

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toString

Return the string representation of the object, generally return "[Native Object]", the object can be reimplemented according to its own characteristics

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String MongoCollection.toString();

return result:

• String, returns a string representation of the object

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toJSON

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

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

Call parameters:

• key: String, not used

return result:

• Value, which returns a JSON-serializable value