【MongoDB】mongoimport mongoexport

mongoexport：将数据导出成JSON格式，与标准的JSON有些不同

参数说明：

[root@localhost mongodb]# ./bin/mongoexport –help

Export MongoDB data to CSV, TSV or JSON files.

options:

–help produce help message

-v [ –verbose ] be more verbose (include multiple times for more verbosity e.g. -vvvvv)

–version print the program’s version and exit

-h [ –host ] arg mongo host to connect to ( /s1,s2 for sets)

–port arg server port. Can also use –host hostname:port

–ipv6 enable IPv6 support (disabled by default)

-u [ –username ] arg username

-p [ –password ] arg password

–dbpath arg directly access mongod database files in the given

path, instead of connecting to a mongod server -

needs to lock the data directory, so cannot be used

if a mongod is currently accessing the same path

–directoryperdb if dbpath specified, each db is in a separate directory

–journal enable journaling

-d [ –db ] arg database to use

-c [ –collection ] arg collection to use (some commands)

-f [ –fields ] arg comma separated list of field names e.g. -f name,age

–fieldFile arg file with fields names - 1 per line

-q [ –query ] arg query filter, as a JSON string

–csv export to csv instead of json

-o [ –out ] arg output file; if not specified, stdout is used

–jsonArray output to a json array rather than one object per line

-k [ –slaveOk ] arg (=1) use secondaries for export if available, default true

常用: mongoexport -d testdb -c testcol -o out.dat

mongoimport：从JSON导入，由于与标准的JSON略有些不同，如果出现错误，可以先导出看看mongo的格式要求，再导入

[root@localhost mongodb]# ./bin/mongoimport –help

options:

–help produce help message

-v [ –verbose ] be more verbose (include multiple times for more verbosity e.g. -vvvvv)

–version print the program’s version and exit

-h [ –host ] arg mongo host to connect to ( /s1,s2 for sets)

–port arg server port. Can also use –host hostname:port

–ipv6 enable IPv6 support (disabled by default)

-u [ –username ] arg username

-p [ –password ] arg password

–dbpath arg directly access mongod database files in the given

path, instead of connecting to a mongod server -

needs to lock the data directory, so cannot be used

if a mongod is currently accessing the same path

–directoryperdb if dbpath specified, each db is in a separate directory

–journal enable journaling

-d [ –db ] arg database to use

-c [ –collection ] arg collection to use (some commands)

-f [ –fields ] arg comma separated list of field names e.g. -f name,age

–fieldFile arg file with fields names - 1 per line

–ignoreBlanks if given, empty fields in csv and tsv will be ignored

–type arg type of file to import. default: json (json,csv,tsv)

–file arg file to import from; if not specified stdin is used

–drop drop collection first

–headerline CSV,TSV only - use first line as headers

–upsert insert or update objects that already exist

–upsertFields arg comma-separated fields for the query part of the upsert. You should make

sure this is indexed

–stopOnError stop importing at first error rather than continuing

–jsonArray load a json array, not one item per line. Currently limited to 4MB.