mongodb查询数据导出:mongoexport

1.导出命令

mongoDB中的mongoexport工具可以把一个collection导出成JSON格式或CSV格式的文件。可以通过参数指定导出的数据项，也可以根据指定的条件导出数据。

2.命令说明

语法：

        mongoexport -d dbname -c collectionname -o file --type json/csv -f field 

参数列表：

Options:
  --help                                produce help message
  -v [ --verbose ]                      be more verbose (include multiple times
                                        for more verbosity e.g. -vvvvv)
  --quiet                               silence all non error diagnostic 
                                        messages
  --version                             print the program's version and exit
  -h [ --host ] arg                     mongo host to connect to ( <set 
                                        name>/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
  --authenticationDatabase arg          user source (defaults to dbname)
  --authenticationMechanism arg (=MONGODB-CR)
                                        authentication mechanism
  --gssapiServiceName arg (=mongodb)    Service name to use when authenticating
                                        using GSSAPI/Kerberos
  --gssapiHostName arg                  Remote host name to use for purpose of 
                                        GSSAPI/Kerberos authentication
  --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                      each db is in a separate directory 
                                        (relevant only if dbpath specified)
  --journal                             enable journaling (relevant only if 
                                        dbpath specified)
  -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 field names - 1 per line
  -q [ --query ] arg                    query filter, as a JSON string, e.g., 
                                        '{x:{$gt:1}}'
  --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
  --forceTableScan                      force a table scan (do not use 
                                        $snapshot)
  --skip arg (=0)                       documents to skip, default 0
  --limit arg (=0)                      limit the numbers of documents 
                                        returned, default all
  --sort arg                            sort order, as a JSON string, e.g., 
                                        '{x:1}'

 说明：

-h：数据库宿主机的IP

-u：数据库用户名

-p：数据库密码

-d：数据库名字

-c：集合的名字

-f：导出的列名

-q：导出数据的过滤条件

--csv：导出格式为csv

 

3.示例

1）导出前10条记录：

 2）导出符合查询条件的记录：