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mongoexport

2024-07-09 15:50| 来源: 网络整理| 查看: 265

Behavior¶ Type Fidelity¶

Warning

Avoid using mongoimport and mongoexport for full instance production backups. They do not reliably preserve all rich BSON data types, because JSON can only represent a subset of the types supported by BSON. Use mongodump and mongorestore as described in MongoDB Backup Methods for this kind of functionality.

Starting in version 4.2, mongoexport:

Outputs data in Extended JSON v2.0 (Relaxed mode) by default. Outputs Extended JSON v2.0 (Canonical mode) if used with --jsonFormat.

Earlier versions used Extended JSON v1.0 (Canonical mode).

For example, the following insert operation in the mongo shell uses the various shell helpers for the BSON types Date and 64-bit integer:

copy use test db.traffic.insert( { _id: 1, volume: NumberLong('2980000'), date: new Date() } )

The argument to 64-bit integer must be quoted to avoid potential loss of accuracy.

Use mongoexport to export the data:

copy mongoexport --db=test --collection=traffic --out=traffic.json

In version 4.2+, the exported data is in Extended JSON v2.0 (Relaxed mode).

copy {"_id":1.0,"volume":2980000,"date":{"$date":"2019-08-05T16:18:29.559Z"}}

To output in Extended JSON v2.0 (Canonical mode), include the --jsonFormat=canonical:

copy mongoexport --db=test --collection=traffic --jsonFormat=canonical --out=traffic.json

The exported data is in Extended JSON v2.0 (Canonical mode):

copy {"_id":{"$numberDouble":"1.0"},"volume":{"$numberLong":"2980000"},"date":{"$date":{"$numberLong":"1565363188675"}}}

In version 4.0 and earlier, the exported data is in Extended JSON v1.0 (Strict mode)

copy {"_id":1.0,"volume":{"$numberLong":"2980000"},"date":{"$date":"2019-08-05T16:18:29.559Z"}} FIPS¶

Starting in version 4.2, MongoDB removes the --sslFIPSMode option for mongoexport. mongoexport will use FIPS compliant connections to mongod/mongos if the mongod/mongos instances are configured to use FIPS mode.

Read Preference¶

By default, mongoexport uses read preference primary. To override the default, you can specify the read preference in the --readPreference command line option or in the --uri connection string.

Starting in version 4.2, if you specify read preference in the URI string and the --readPreference, the --readPreference value overrides the read preference specified in the URI string.

In earlier versions, the two options are incompatible.

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