MongoDB Bitwise Update Operator

The MongoDB Bitwise Update Operator allows for efficient manipulation of integer fields within MongoDB documents through bitwise operations. In this article, We will learn about the MongoDB Bitwise Update Operator in detail by understanding various examples in detail.

MongoDB Bitwise Update Operator

MongoDB Bitwise Update Operator allows performing bitwise operations on integer fields in MongoDB documents. It includes operators like $bit, which can be used to update specific bits within integer fields using bitwise operations such as AND (&), OR (|), XOR (^), and NOT (~). This enables efficient manipulation of binary data or flags stored within integer fields directly in the database.

Syntax: 

{ $bit: { <field1>: { <or|and|xor>: <int> } } }

Important Points:

• Use $bit operator only with integer fields(either 32-bit integer or 64-bit integer)
• To specify a field in embedded/nested documents or in an array use dot notation.
• All the numbers in the mongo shell are double not an integer. So, you need to use NumberInt() or the NumberLong() constructor to specify integers.
• You can use this operator in methods like update(), findAndModify(), etc., according to your requirements.

Examples of MongoDB Bitwise Update Operator

In the following examples, we are working with: 

Database: GeeksforGeeks 
Collection: bitexample 
Document: three documents that contain the data in the form of field-value pairs. 

Output:

 Example 1: Bitwise OR

In this example, we are using update() method to update the value of number field of the document(id: g_f_g_2) to the result(i.e. NumberLong(13) or 1101) of a bitwise or operation perform between the current value NumberLong(5) (i.e. 0101) and NumberInt(9) (i.e. 1001): 

db.bitexample.update(
  { _id: "g_f_g_2" },
  { $bit: { number: { or: NumberInt(9) } } }
);

Output:

Exampe 2: Bitwise AND

In this example, we are using update() method to update the value of number field of the document(id: g_f_g_1) to the result(i.e. NumberInt(1) or 0001) of a bitwise and operation perform between the current value NumberInt(11) (i.e. 1011) and NumberInt(5) (i.e. 0101): 

db.bitexample.update({_id: "g_f_g_1"},
    {$bit: {number: {and: NumberInt(5)}}})

Output:

Example 3: Bitwise XOR

In this example, we are using update() method to update the value of number field of the document(id: g_f_g_3) to the result(i.e. NumberLong(10) or 1010) of a bitwise xor operation perform between the current value NumberLong(7) (i.e. 0111) and NumberLong(13) (i.e. 1101): 

db.bitexample.update(
  { _id: "g_f_g_3" },
  { $bit: { number: { xor: NumberLong(13) } } }
);

Output:

Conclusion

The MongoDB Bitwise Update Operator provides a powerful means of performing bitwise operations on integer fields within MongoDB documents. By using operators like $bit, developers can efficiently manage binary data or flags, ensuring targeted and efficient updates. This functionality is particularly useful in scenarios requiring precise control over individual bits within an integer field, promoting robust and efficient data handling within MongoDB.

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Article Tags :

• MongoDB
• Databases
• MongoDB-operators