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 ( /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 ( /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