Ian – Page 282

MongoDB $toLong

January 31, 2021 by Ian

From MongoDB 4.0, you can use the $toLong aggregation pipeline operator to convert a value to a long.

January 31, 2021 by Ian

From MongoDB 4.0, you can use the $toInt aggregation pipeline operator to convert a value to an integer.

January 30, 2021 by Ian

From MongoDB 4.0, you can use the $toDouble aggregation pipeline operator to convert a value to a double.

January 30, 2021 by Ian

From MongoDB 4.0, you can use the $toDecimal aggregation pipeline operator to convert a value to a decimal.

January 30, 2021January 29, 2021 by Ian

From MongoDB 4.0, you can use the $toBool aggregation pipeline operator to convert a value to a boolean.

January 29, 2021 by Ian

From MongoDB 4.0, you can use the $toString aggregation pipeline operator to convert a value to a string.

January 28, 2021 by Ian

In MongoDB, you can use the $convert aggregation pipeline operator to convert a value to a specified type.

You can convert any valid expression to a double, string, ObjectId, boolean, Date, integer, long, or decimal.

January 28, 2021 by Ian

In MongoDB, the Date() method returns a date either as a string or as a Date object.

When you call it as Date(), it returns the current date as a string in the mongo shell.
When you call it as new Date(), it returns the current date as a Date object.

You can also provide a specific date as an argument to new Date(), so that it uses that date.

January 28, 2021 by Ian

MongoDB provides the NOW system variable that allows you to get the current datetime value when using an aggregation pipeline.

This can be useful for when you want to update a document with the current datetime.

January 28, 2021January 27, 2021 by Ian

In MongoDB, the $dateFromParts aggregation pipeline operator constructs and returns a Date object from the date’s constituent parts.

You provide each date part as a separate field.

You can specify your constituent date fields in ISO week date format if required.