mongoexport

从数据库 dataname 中查找 datasheet 这个表，输出到E:\data\name_json.dat

mongoexport -d dataname -c datasheet -o E:\data\name_json.dat

从数据库 dataname 中查找 datasheet 这个表中 isDeleted : false 的数据

mongoexport -d dataname -c datasheet --type=json -q"{isDeleted : false}" -o E:\data\name_json.dat

从数据库 dataname 中查找 datasheet 这个表中 isDeleted : false 的数据，并讲 savesheet 这个表的数据保存

mongoexport -d dataname -c datasheet --type=json -q"{"isDeleted" : false}" -f savesheet -o E:\data\name_json.dat

参数说明：

connection options:

  -h, --host=<hostname>   mongodb host to connect to

                          (setname/host1,host2 for replica sets)

      --port=<port>       server port (can also use --host hostname:port)

library authentication options:

  -u, --username=<username>   username for authentication

  -p, --password=<password>  password for authentication

      --authenticationDatabase=<database-name>    database that holds the user's credentials

      --authenticationMechanism=<mechanism>       authentication mechanism to use

namespace options:

  -d, --db=<database-name>               database to use

  -c, --collection=<collection-name>     collection to use

output options:

  -f, --fields=<field>[,<field>]*   comma separated list of field names (required for exporting CSV) e.g. -f "name,age"

      --fieldFile=<filename>  file with field names - 1 per line

      --type=<type>   the output format, either json or csv (defaults to 'json') (default: json)

  -o, --out=<filename>    output file; if not specified, stdout is used

      --jsonArray         output to a JSON array rather than one object per line

      --pretty            output JSON formatted to be human-readable

      --noHeaderLine      export CSV data without a list of field names at the first line

querying options:

  -q, --query=<json>      query filter, as a JSON string, e.g., '{x:{$gt:1}}'

      --queryFile=<filename>  path to a file containing a query filter (JSON)

  -k, --slaveOk           allow secondary reads if available (default true) (default: false)

      --readPreference=<string>|<json>  specify either a preference name or a preference json object

      --forceTableScan    force a table scan (do not use $snapshot)

      --skip=<count>      number of documents to skip

      --limit=<count>     limit the number of documents to export

      --sort=<json>       sort order, as a JSON string, e.g. '{x:1}'

      --assertExists      if specified, export fails if the collection does not exist (default: false)