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db.cloneCollection()¶

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说明
Behavior
Example

说明¶

db.cloneCollection(from, collection, query)¶

直接在Mongodb实例间复制数据。 db.cloneCollection() 方法封装了 cloneCollection 命令，并接收如下参数：

Parameter Type Description

from string The address of the server to clone from.

collection

string

The collection in the MongoDB instance that you want to copy. db.cloneCollection() will only copy the collection with this name from database of the same name as the current database the remote MongoDB instance.

If you want to copy a collection from a different database name you must use the cloneCollection directly.

query document Optional. A standard query document that limits the documents copied as part of the db.cloneCollection() operation. All query selectors available to the find() are available here.

Behavior¶

mongos does not support db.cloneCollection().

db.cloneCollection() cannot be used if the from server has authorization enabled.

在 3.0 版更改: If the given namespace already exists in the destination mongod instance, db.cloneCollection() will return an error.

Example¶

db.cloneCollection('mongodb.example.net:27017', 'users.profile',
                    { 'active' : true } )

This operation copies the profiles collection from the users database on the server at mongodb.example.net. The operation only copies documents that satisfy the query { 'active' : true }.

← 数据库相关方法 db.cloneDatabase() →