Mongodb数据导出工具mongoexport和导入工具mongoimport介绍
上一篇 / 下一篇 2017-06-05 15:01:11 / 个人分类:数据库
一、导出工具mongoexport
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。mongoexport具体用法如下所示:
- [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 ( <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
- --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
参数说明:
-h:指明数据库宿主机的IP
-u:指明数据库的用户名
-p:指明数据库的密码
-d:指明数据库的名字
-c:指明collection的名字
-f:指明要导出那些列
-o:指明到要导出的文件名
-q:指明导出数据的过滤条件
实例:test库中存在着一个students集合,集合中数据如下:
- > db.students.find()
- { "_id" : ObjectId("5031143350f2481577ea81e5"), "classid" : 1, "age" : 20, "name" : "kobe" }
- { "_id" : ObjectId("5031144a50f2481577ea81e6"), "classid" : 1, "age" : 23, "name" : "nash" }
- { "_id" : ObjectId("5031145a50f2481577ea81e7"), "classid" : 2, "age" : 18, "name" : "james" }
- { "_id" : ObjectId("5031146a50f2481577ea81e8"), "classid" : 2, "age" : 19, "name" : "wade" }
- { "_id" : ObjectId("5031147450f2481577ea81e9"), "classid" : 2, "age" : 19, "name" : "bosh" }
- { "_id" : ObjectId("5031148650f2481577ea81ea"), "classid" : 2, "age" : 25, "name" : "allen" }
- { "_id" : ObjectId("5031149b50f2481577ea81eb"), "classid" : 1, "age" : 19, "name" : "howard" }
- { "_id" : ObjectId("503114a750f2481577ea81ec"), "classid" : 1, "age" : 22, "name" : "paul" }
- { "_id" : ObjectId("503114cd50f2481577ea81ed"), "classid" : 2, "age" : 24, "name" : "shane" }
由上可以看出文档中存在着3个字段:classid、age、name
1.直接导出数据到文件中
- [root@localhost mongodb]# ./bin/mongoexport -d test -c students -o students.dat
- connected to: 127.0.0.1
- exported 9 records
命令执行完后使用ll命令查看,发现目录下生成了一个students.dat的文件
查看该文件信息,具体信息如下:
- [root@localhost mongodb]# cat students.dat
- { "_id" : { "$oid" : "5031143350f2481577ea81e5" }, "classid" : 1, "age" : 20, "name" : "kobe" }
- { "_id" : { "$oid" : "5031144a50f2481577ea81e6" }, "classid" : 1, "age" : 23, "name" : "nash" }
- { "_id" : { "$oid" : "5031145a50f2481577ea81e7" }, "classid" : 2, "age" : 18, "name" : "james" }
- { "_id" : { "$oid" : "5031146a50f2481577ea81e8" }, "classid" : 2, "age" : 19, "name" : "wade" }
- { "_id" : { "$oid" : "5031147450f2481577ea81e9" }, "classid" : 2, "age" : 19, "name" : "bosh" }
- { "_id" : { "$oid" : "5031148650f2481577ea81ea" }, "classid" : 2, "age" : 25, "name" : "allen" }
- { "_id" : { "$oid" : "5031149b50f2481577ea81eb" }, "classid" : 1, "age" : 19, "name" : "howard" }
- { "_id" : { "$oid" : "503114a750f2481577ea81ec" }, "classid" : 1, "age" : 22, "name" : "paul" }
- { "_id" : { "$oid" : "503114cd50f2481577ea81ed" }, "classid" : 2, "age" : 24, "name" : "shane" }
参数说明:
-d:指明使用的库,本例中为test
-c:指明要导出的集合,本例中为students
-o:指明要导出的文件名,本例中为students.dat
从上面的结果可以看出,我们在导出数据时没有显示指定导出样式 ,默认导出了JSON格式的数据。如果我们需要导出CSV格式的数据,则需要使用--csv参数,具体如下所示:
- [root@localhost mongodb]# ./bin/mongoexport -d test -c students --csv -f classid,name,age -o students_csv.dat
- connected to: 127.0.0.1
- exported 9 records
- [root@localhost mongodb]# cat students_csv.dat
- classid,name,age
- 1.0,"kobe",20.0
- 1.0,"nash",23.0
- 2.0,"james",18.0
- 2.0,"wade",19.0
- 2.0,"bosh",19.0
- 2.0,"allen",25.0
- 1.0,"howard",19.0
- 1.0,"paul",22.0
- 2.0,"shane",24.0
- [root@localhost mongodb]#
参数说明:
-csv:指明要导出为csv格式
-f:指明需要导出classid、name、age这3列的数据
由上面结果可以看出,mongoexport成功地将数据根据csv格式导出到了students_csv.dat文件中。
二、导入工具mongoimport
Mongodb中的mongoimport工具可以把一个特定格式文件中的内容导入到指定的collection中。该工具可以导入JSON格式数据,也可以导入CSV格式数据。具体使用如下所示:
- [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 ( <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
- --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.
参数说明:
-h:指明数据库宿主机的IP
-u:指明数据库的用户名
-p:指明数据库的密码
-d:指明数据库的名字
-c:指明collection的名字
-f:指明要导入那些列
示例:先删除students中的数据,并验证
然后再导入上面导出的students.dat文件中的内容
- [root@localhost mongodb]# ./bin/mongoimport -d test -c students students.dat
- connected to: 127.0.0.1
- imported 9 objects
- [root@localhost mongodb]#
参数说明:
-d:指明数据库名,本例中为test
-c:指明collection名,本例中为students
students.dat:导入的文件名
查询students集合中的数据
- > db.students.find()
- { "_id" : ObjectId("5031143350f2481577ea81e5"), "classid" : 1, "age" : 20, "name" : "kobe" }
- { "_id" : ObjectId("5031144a50f2481577ea81e6"), "classid" : 1, "age" : 23, "name" : "nash" } &nb
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