MongoDB set of study notes _2_

Set operations

MongoDB concept equivalent to the set of SQL table concept.

• Create Collection
  1. db.createCollextion()
  2. When you insert a document to a collection, if the collection does not exist, it is automatically createddb.collection_name.insert()
• A set of naming conventions
  1. It can not be an empty string
  2. Not contain '\ 0'
  3. Not start with a system, which is reserved prefix collection system
  4. Do the same name and a set of reserved words do not include $
• View the collection database
  • show tablesorshow collections
• Delete Collection
  • db.collection_name.drop()
• Modify the collection name
  • db.collection_name.renameCollection('newName')
    • eg class1 will be renamed class0 db.class1.renameCollection('class0')
• Gets a collection of objects
  • db.collection_name
  • db.getCollection('collection_name')