MongoDB InsertData

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Inserting data

The format for the INSERT command is:

 db.collectionName.insert( 
  {
    key_1: 'value1',
    key_n: valueN
  }
 )

Note:

• character and date values must be enclosed in matching single (') or double quotes (").
• numeric values do not need quotes.
• key/value pairs are comma-separated (no comma needed after the last pair)
• each record is enclosed in curly brackets: {}

Department 10

The following example will create a dept collection that will hold the DEPT table as seen in the Oracle Sample Data.

Add department 10:

db.dept.insert( 
 {
    deptno: 10, 
    dname: 'ACCOUNTING',
    loc: 'NEW YORK'
   } 
 )

Assuming you have no error messages, the system should respond with:

 WriteResult({ "nInserted" : 1 })

Department 20

Next add department 20:

db.deptCollection.insert( 
 {
  deptno: 20,
  dname: 'RESEARCH',
  loc: 'DALLAS',
  employees: [
   {
      empno: 7876,
      ename: 'ADAMS',
      job: 'CLERK',
      mgr: 7788,
      hiredate: new Date(),
      sal: 1100
   },
   {
      empno: 7902,
      ename: 'FORD',
      job: 'ANALYST',
      mgr: 7566,
      hiredate: new Date('1991-12-03'),
      sal: 3000
   },
   {
      empno: 7066,
      ename: 'JONES',
      job: 'MANAGER',
      mgr: 7839,
      hiredate: new Date('1991-04-02'),
      sal: 2975
   },
   {
      empno: 7788,
      ename: 'SCOTT',
      job: 'ANALYST',
      mgr: 7566,
      hiredate: new Date('2015-10-16'),
      sal: 3000
   }    
  ]
 }
)

Department 40

Next department 40, which has no employees currently:

db.deptCollection.insert( 
 {
   deptno: 40,
   dname: 'OPERATIONS',
   loc: 'BOSTON'
 }
)

Things to note

If you are getting errors, check carefully that:

• every opening bracket has an appropriate closing bracket:
  • the insert statement uses round brackets: ()
  • an array uses square brackets: []
  • a collection uses curly brackets: {}
    • each element in a nested collection will also use curly brackets
• each key:value pair are separated by commas, except for the last item
• strings are enclosed in single or double quotes, e.g., 'myString', or "myString"
• date strings are enclosed in single/double quotes and the format is 'yyyy-mm-dd' e.g., Date('2016-10-10')
• use the Date() constructor to create a date datatype
• date can also be a datetime, e.g., new Date("<yyyy-mm-ddThh:mm:ss>")
• new Date() will return the current date

Exercise 2.1

• Compare how you added the above data and how it differs from INSERT records in a relational database
• Try and add Department 30. Note it has some values for the comm field.

Next Step

Querying the collection