MongoDB operation instruction in common

MongoDB operation instruction in common

• 1. mongodStart services mongoto enter the command mode
• 2. The show dbsdisplay says some database
  
• 3.db view the database of the current operation

• 4.use switch the current operation of the database without this database will be created
• 
• 5.db. set (analogous to a relational database table) .insertOne () is inserted into a data
  
• db. collection .find () all data found in this collection
  
  collection of two-dimensional table ===

=== document database
only need to specify where to insert the data, you do not need to manually building a database built form

find()
findOne()
save()

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