mongoexport

Synopsis¶

mongoexport is a utility that produces a JSON or CSV export of data stored in a MongoDB instance. See the “数据导入和导出” document for a more in depth usage overview, and the “mongoimport” document for more information regarding the mongoimport utility, which provides the inverse “importing” capability.

Options¶

mongoexport¶

 

--help¶

Returns a basic help and usage text.

--verbose, -v¶

Increases the amount of internal reporting returned on the command line. Increase the verbosity with the -v form by including the option multiple times, (e.g. -vvvvv.)

--version¶

Returns the version of the mongoexport utility.

--host <hostname><:port>¶

Specifies a resolvable hostname for the mongod from which you want to export data. By default mongoexport attempts to connect to a MongoDB process ruining on the localhost port number 27017.

Optionally, specify a port number to connect a MongoDB instance running on a port other than 27017.

To connect to a replica set, you can specify the replica set seed name, and a seed list of set members, in the following format:

<replica_set_name>/<hostname1><:port>,<hostname2:<port>,...

--port <port>¶

Specifies the port number, if the MongoDB instance is not running on the standard port. (i.e. 27017) You may also specify a port number using the mongoexport --host command.

--ipv6¶

Enables IPv6 support that allows mongoexport to connect to the MongoDB instance using an IPv6 network. All MongoDB programs and processes, including mongoexport, disable IPv6 support by default.

--username <username>, -u <username>¶

Specifies a username to authenticate to the MongoDB instance, if your database requires authentication. Use in conjunction with the mongoexport --password option to supply a password.

--password <password>¶

Specifies a password to authenticate to the MongoDB instance. Use in conjunction with the --username option to supply a username.

If you specify a --username without the --password option, mongoexport will prompt for a password interactively.

--dbpath <path>¶

Specifies the directory of the MongoDB data files. If used, the --dbpath option enables mongoexport to attach directly to local data files and insert the data without the mongod. To run with --dbpath, mongoexport needs to lock access to the data directory: as a result, no mongod can access the same path while the process runs.

--directoryperdb¶

Use the --directoryperdb in conjunction with the corresponding option to mongod, which allows mongoexport to export data into MongoDB instances that have every database’s files saved in discrete directories on the disk. This option is only relevant when specifying the --dbpath option.

--journal¶

Allows mongoexport operations to access the durability journal to ensure that the export is in a consistent state. This option is only relevant when specifying the --dbpath option.

--db <db>, -d <db>¶

Use the --db option to specify the name of the database that contains the collection you want to export.

--collection <collection>, -c <collection>¶

Use the --collection option to specify the collection that you want mongoexport to export.

--fields <field1[,field2]>, -f <field1[,field2]>¶

Specify a field or number fields to include in the export. All other fields will be excluded from the export. Comma separate a list of fields to limit the fields exported.

--fieldFile <file>¶

As an alternative to “--fields” the --fieldFile option allows you to specify a file (e.g. <file>`) to hold a list of field names to specify a list of fields to include in the export. All other fields will be excluded from the export. Place one field per line.

--query <JSON>¶

Provides a JSON document as a query that optionally limits the documents returned in the export.

--csv¶

Changes the export format to a comma separated values (CSV) format. By default mongoexport writes data using one JSON document for every MongoDB document.

--jsonArray¶

Modifies the output of mongoexport to write the entire contents of the export as a single JSON array. By default mongoexport writes data using one JSON document for every MongoDB document.

--slaveOk, -k¶

Allows mongoexport to read data from secondary or slave nodes when using mongoexport with a replica set. This option is only available if connected to a mongod or mongos and is not available when used with the “mongoexport --dbpath” option.

This is the default behavior.

--out <file>, -o <file>¶

Specify a file to write the export to. If you do not specify a file name, the mongoexport writes data to standard output (e.g. stdout).

Usage¶

In the following example, mongoexport exports the collection contacts from the users database from the mongod instance running on the localhost port number 27017. This command writes the export data in CSV format into a file located at /opt/backups/contacts.csv.

mongoexport --db users --collection contacts --csv --out /opt/backups/contacts.csv

The next example creates an export of the collection contacts from the MongoDB instance running on the localhost port number 27017, with journaling explicitly enabled. This writes the export to the contacts.json file in JSON format.

mongoexport --db sales --collection contacts --out contacts.json --journal

The following example exports the collection contacts from the sales database located in the MongoDB data files located at /srv/mongodb/. This operation writes the export to standard output in JSON format.

mongoexport --db sales --collection contacts --dbpath /srv/mongodb/

The final example exports the collection contacts from the database marketing . This data resides on the MongoDB instance located on the host mongodb1.example.net running on port 37017, which requires the username user and the password pass.

mongoexport --host mongodb1.example.net --port 37017 --username user --password pass --collection contacts --db marketing --out mdb1-examplenet.json