mongodb 数据库基础实践

mongodb数据库基础操作，包括数据库的创建，查询，检索等等操作，实验使用实验楼的mongodb的基础教程中管理员工基础信息的测试。

基本操作方法是

mongo启动

mongo

创建数据库

use shiyanlou

创建文档

db.createCollection('employee')

查看数据库和文档

show dbs
show collections

添加集合

employee1 = ({'sid':1001,'sname':'Tom','age':35,'gender':'male','phone':'13981234567','address':[{'city':'Chengdu','district':'jinniu'}]})
employee2 = ({'sid':1002,'sname':'Jack','age':26,'gender':'male','phone':'13981357913','address':[{'city':'Chengdu','district':'wudou'}]})
employee3 = ({'sid':1003,'sname':'Rose','age':31,'gender':'female','phone':'13980246802','address':[{'city':'Chongqing','district':'jiangbei'}]})
employee4 = ({'sid':1004,'sname':'Bob','age':29,'gender':'male','phone':'13987654321','address':[{'city':'Chongqing','district':'yuzhong'}]})
employee5 = ({'sid':1005,'sname':'Gavin','age':24,'gender':'male','phone':'13989753197','address':[{'city':'Chengdu','district':'jinniu'}]})
employee6 = ({'sid':1006,'sname':'Amy','age':27,'gender':'female','phone':'13988642086','address':[{'city':'Shanghai','district':'xuhui'}]})
employee7 = ({'sid':1007,'sname':'Anne','age':23,'gender':'female','phone':'18211237894','address':[{'city':'Chengdu','district':'qingyang'}]})
employee8 = ({'sid':1008,'sname':'John','age':33,'gender':'male','phone':'18219638521','address':[{'city':'Chongqing','district':'jiangbei'}]})
employee9 = ({'sid':1009,'sname':'Tony','age':36,'gender':'male','phone':'18211478523','address':[{'city':'Chengdu','district':'jinniu'}]})
employee10 = ({'sid':1010,'sname':'Betty','age':28,'gender':'female','phone':'18218520369','address':[{'city':'Beijing','district':'chaoyang'}]})
db.employee.insert([employee1,employee2,employee3,employee4,employee5,employee6,employee7,employee8,employee9,employee10])

更新几何

db.employee.update({'sname':'Tom'},{$set:{'phone':'18200753159','address':[{'city':'chengdu','district':'chenghua'}]}})

创建索引

db.employee.ensureIndex({'sid':1,'sname':1})

mongoexport导出json文件，需先推出mongo环境，执行exit，

mongoexport -d shiyanlou -c employee -q '{age: {$gte:30}}' --out tmp/employee.json

基本格式为

mongoexport命令行用于数据的导出，默认导出的文件格式为JSON格式。当然也可以指定特定的文件格式。
2、语法

[html] view plain copy
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
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
-o:指明到要导出的文件名

mongoimport导入操作

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：
2.语法
[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

附录：

实验楼的实验地址：https://www.shiyanlou.com/courses/12