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)}}})
MongoDB Bitwise Update Operator
MongoDB provides a $bit operator to perform a bitwise update of a field. This operator supports bitwise xor, bitwise or, and bitwise and operations.
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.
In the following examples, we are working with:
Database: w3wiki
Collection: bitexample
Document: three documents that contain the data in the form of field-value pairs.
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