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

Subscript operation

Quickly obtain 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 based on 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 conditions
• projection : Object, specify the object of the returned field

Return result:

• MongoCursor , returns the cursor object

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 conditions
• projection : Object, specify the object of the returned field

Return result:

• Object , return 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

insert

Insert a set of data

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MongoCollection.insert(Array documents);

Call parameters:

• documents : Array, specify the array of data 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

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

update

Update 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 conditions
• 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 conditions, update all data, the default is false, only update the first one

Update 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 conditions
• 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 conditions

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 return result

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 return result

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.

reIndex

Rebuild the index of the current collection

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Object MongoCollection.reIndex();

Return result:

• Object , return command execution result

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

dropIndexes

Delete all indexes of the current collection

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Object MongoCollection.dropIndexes();

Return result:

• Object , return command execution result

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

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 , returns a new collection object

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

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