一、Mongodb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
C:\mongo\bin>mongoexport -help options: --help produce help message -v [ --verbose ] be more verbose (include multiple times for more verbosity e.g. -vvvvv) -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 -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
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
二、常用数据导出实例
1.直接导出数据到文件中
[[email protected] bin]# ./mongoexport -d my_mongodb -c user -o user.dat connected to: 127.0.0.1 exported 2 records [[email protected] bin]# cat user.dat { "_id" : { "$oid" : "4f81a4a1779282ca68fd8a5a" }, "uid" : 2, "username" : "Jerry", "age" : 100 } { "_id" : { "$oid" : "4f844d1847d25a9ce5f120c4" }, "uid" : 1, "username" : "Tom", "age" : 25 } [[email protected] bin]#
命令执行完后使用命令查看,会发现目录下生成了一个students.dat的文件
参数说明
-d 指明使用的库, 本例中为” my_mongodb”
-c 指明要导出的表, 本例中为”user”
-o 指明要导出的文件名, 本例中为”user.dat”
从上面可以看到导出的方式使用的是JSON 的样式
2、将foo库中的表t1导出成json格式
[[email protected] bin]# ./mongoexport -d foo -c t1 -o /data/t1.json connected to: 127.0.0.1 exported 1 records [[email protected] bin]#
导出成功后我们看一下/data/t1.json文件的样式
[email protected] data]# more t1.json { "_id" : { "$oid" : "4f927e2385b7a6814a0540a0" }, "age" : 2 } [[email protected] data]#
3、导出为CSV格式的数据
[[email protected] bin]# ./mongoexport -d foo -c t2 --csv -f age,name -o /data/t2.csv connected to: 127.0.0.1 exported 1 records [[email protected] bin]#
查看/data/t2.csv的导出结果
[[email protected] data]# more t2.csv age,name 1,"wwl" [[email protected] data]#
三、Mongodb导入工具mongoexport
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
[[email protected] 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
四、常用数据导入实例
1、导入JSON 数据
[[email protected] mongodb]# ./bin/mongoimport -d test -c students students.dat connected to: 127.0.0.1 imported 9 objects [[email protected] 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
2、导入CSV格式文件中的内容
[[email protected] mongodb]# ./bin/mongoimport -d test -c students --type csv --headerline --file students_csv.dat connected to: 127.0.0.1 imported 10 objects [[email protected] mongodb]#
参数说明:
-type:指明要导入的文件格式
-headerline:指明第一行是列名,不需要导入
-file:指明要导入的文件
此篇文章转自于 https://www.jb51.net/article/65923.html
原文地址:https://www.cnblogs.com/hankleo/p/10350068.html