What is NumberLong in MongoDB?
NumberLong. The mongo shell treats all numbers as floating-point values by default. The mongo shell provides the NumberLong() wrapper to handle 64-bit integers.
What is $Set in MongoDB?
Definition¶ $set outputs documents that contain all existing fields from the input documents and newly added fields. The $set stage is an alias for $addFields . Both stages are equivalent to a $project stage that explicitly specifies all existing fields in the input documents and adds the new fields.
How do I change the field type in MongoDB?
Change the field type in a single document Under Type, choose the new field type (e.g. date ). Then, choose to set the field in the current document only. Click Set Value. This should update the MongoDB field type in that document.
What is Bsondump?
bsondump is a diagnostic tool for inspecting BSON files, not a tool for data ingestion or other application use. bsondump uses Extended JSON v2. 0 (Canonical mode) to format its data. Run bsondump from the system command line, not the mongo shell.
How to convert string to numerical values in MongoDB?
Let us first create a collection with a document. The query to create a collection with a document is as follows: Display all documents from the collection with the help of find () method. The query is as follows − Here is the query to convert a string to numerical values in MongoDB.
How is the long value returned in MongoDB?
Returns the long value as a double. Returns the numerical value of the string as a double. The string value must be of a base 10 numeric value (e.g. “-5.5”, “123456”) and fall within the minimum and maximum value for a double.
What makes an argument a double in MongoDB?
The argument can be any valid expression that resolves to one of the following numeric or string identifiers: For more information on the conversion to double, see Converting to a Double. For more information on the conversion to string, see Converting to a String. For more information on the conversion to objectId, see Converting to an ObjectId.
When to use convert instead of aggregation in MongoDB?
The following aggregation operation on the orders collection converts the price to a decimal and the qty to an integer before calculating the total price: If the conversion operation encounters an error, the aggregation operation stops and throws an error. To override this behavior, use $convert instead.