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Monday, 30 November 2015

MongoDB Database Commands with Examples

mongoDB Database Commands with Examples

Question: Expalin the Basic terminology for MongoDB?
RDBMS MongoDB
Database Database
Table Collection
Tuple/Row Document
column Field
Table Join Embedded Documents
Primary Key Primary Key (Default key _id provided by mongodb itself)
Mysqld/Oracle mongod
mysql/sqlplus mongo

Note: # used for commenting.

Question: Create a New database?
use mydb #switched to db mydb



Question: Check which database you are currently using?
use



Question: Display the List of databases?
show dbs #All database will display which have atleast 1 document.



Question: Delete the current database?
db.dropDatabase() #Delete the current used database.



Question: How to create collection for a database?
db.createCollection("mycollection") #create a collection for current selected database.



Question: Display the List of collections in database?
show collections #All collection will display for current database.



Question: How to drop the collection?
db.mycollection.drop() #mycollection collection will be deleted.



Question: How to insert data(Know as document) into collection?
db.mycollection.insert({
   _id: ObjectId(7df78ad89765),
   title: 'MongoDB Overview',    
   by: 'Web technology',   
   tags: ['mongodb', 'database', 'NoSQL'],   
})
#Single document is added in collection "mycollection" .



Question: How to add multiple document into collection in single command?
db.mycollection.insert({
   {   
   title: 'MongoDB Overview',    
   by: 'Web technology',   
   tags: ['mongodb', 'database', 'NoSQL'],   
   },
 
   {
   title: 'MongoDB Overview2',    
   by: 'Web technology experts notes',   
   tags: ['mongodb', 'database', 'NoSQL' ,'Multiple Record'],   
       
   }
])



Question: What is command for search a document? Give Example?
find() is used to search. For Example

db.mycollection.find()#Search the one document in un structured way .



Question: How to search a document in pretty way (structured way) ? Give Example?
pretty() is used to search in pretty way. For Example

db.mycollection.find({"by":"Web technology"}).pretty()#Search the one document in structured way .



Question: How to search a document with "and condition"?
db.mycollection.find({"by":"Web technology",{"title": "MongoDB Overview"}}).pretty()#Search the one document in structured way .



Question: How to list first 10 document?
db.mycollection.find({"by":"Web technology",{"title": "MongoDB Overview"}}).limit(10).pretty()#Search the 10 document in structured way .



Question: How to get 2nd document?
db.mycollection.find({"by":"Web technology",{"title": "MongoDB Overview"}}).limit(1).skip(1).pretty()#Search the 10 document in structured way .



Question: How to list document with title ascending order?
db.mycollection.find({"by":"Web technology",{"title": "MongoDB Overview"}}).sort({"title":1}).pretty()#Search the in title ascending order.



Question: How to search document in title descending order?
db.mycollection.find({"by":"Web technology",{"title": "MongoDB Overview"}}).sort({"title":-1}).pretty()#Search the in title descending order. 



Question: How to Add indexing?
db.mycollection.ensureIndex({"title":1,"description":-1})#title in ascending order and description in descending order.To create index in descending order you need to use -1. 



Question: How to search a document with "OR condition"?
db.mycollection.find({"by":"Web technology",$or[{"title": "MongoDB Overview"}]}).pretty()#Search the one document in structured way .



Question: How to update a document?
db.mycollection.update({'title':'MongoDB Overview'},{$set:{'title':'MongoDB text'}})#update "MongoDB Overview" with "MongoDB text " .



Question: How to delete a document?
db.mycollection.remove({'title':'MongoDB Overview'})#Delete the record where document is 'MongoDB Overview' .




Find all records
db.mycollection.find();
Display all the records in this collection.



Find all records and display in pretty way
db.mycollection.find().pretty();
Display all the records in this collection but presentable way.



Find all records with single condition (Age: 29)
db.mycollection.find({age:29});
Display all the records where age=29.



Find all records with multiple AND condition (Age: 29, Number:17)
db.mycollection.find({age:29, number:17});
Display all the records where age=29 and number=17



Find all records with multiple OR condition (Age: 29 OR Number:17)
db.mycollection.find({$or:[{age:29},{number:17}]});
Display all the records where age=29 OR number=17 (each of one).



Find all records with multiple OR condition (Age>28 OR Number:17)
db.mycollection.find({$or:[{age:{$gt:28}},{number:17}]});
Display all the records where age>29 and number=17



Find all records and display and one display column (name)
db.mycollection.find({},{name:1}).pretty();
Display all the name in this collections.



Find all records and display and two display column (name and number)
db.mycollection.find({},{name:1,number:1}).pretty();
Display all the name and number in this collections.



Limit the number of record
db.mycollection.find().limit(3).pretty();
Display only 3 records.



Display all the records except 1,2,3
db.mycollection.find().skip(3).pretty();
Skip first 3 records.


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