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MongoDB is an open source document database that stores data in flexible, JSON-like documents. It allows embedding related data and does not require fixed schemas. MongoDB documents can contain fields that are sub-documents and arrays of documents, allowing it to represent many types of real-world data. Unlike SQL databases, MongoDB does not require data normalization or table joins.
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Bi presentation
- 1. MongoDB Open Source document database Often refered to as NoSQL
- 2. JSON style Documents {name: ‘stephen ward’, gender:’male’ , dob:’Nov. 12 ,1958’ , maritalStatus: ‘married’ }
- 3. Or Compound Doc {name: ‘stephen ward’, gender:’male’ , dob:’Nov. 12 ,1958’ , maritalStatus: ‘married’, skills:{mongoDB:’true’, javascript:’true’,SQL:’true ’,COBOL:’false’} }
- 4. UM what was that Yes if your a SQL DBA you just said Woooo Because you would have had to create a separate table called skills and do a JOIN . MongoDB does not have joins. So how you think of your SCHEMA will be completely different.
- 5. Simple ?
- 6. What took place • There was no database named bigroup if there was then if would have switched to it. If there wasn’t if would still have said switched , but it would just create a new db of that name • Therefore be carefull • Using the shell I can do some javascript like calls.
- 7. How about a little update
- 8. The update • You’ll notice if I dont have an _id object then mongo makes the unique index for me. • Save will insert if no unique index found or update if a unique index is found.
- 10. Return partial • Only want a subset of the collection
- 11. Like
- 12. OK lets have a little fun • Node.js • Express • Mongojs