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This article will explain in detail the example analysis based on data types and $type operator in MongoDB database. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

The previous words

This article describes in detail the data types of the MongoDB database and the $type operator

Type numbers Note Double 1 double precision floating point numbers-this type is used to store floating point value String 2 strings-this is the most common data type used to store data. Strings in MongoDB must be UTF-8Object 3 objects-this data type is used for embedded document Array 4 arrays-this type is used to store arrays or lists or multiple values in a key Binary data 5 binary data-this data type is used to store binary data Undefined 6 obsolete Object id 7 object ID-this data type is used to store IDBoolean 8 Boolean type for storing documents-this type is used to store Boolean (true / false) values Date 9 dates-this data type is used to store the current date or time in UNIX time format. You can specify the date time you need by creating a date object and setting the date of the day, month, and year Null 10 Null-this type is used to store null values Regular 11 regular expressions-this data type is used to store regular expression JavaScript 13 code-this data type is used to store JavaScript code in the document Symbol 14 symbols-this data type is the same as a string However, language JavaScript (with scope) 15 code is usually reserved for using specific symbol types-this data type is used to store scoped JavaScript code in a document 32-bit integer 16 32-bit integers-this type is used to store numeric Timestamp 17 timestamps-when the document is modified or added You can easily record 64-bit integer 18 64-bit integers-this type is used to store numeric values Min key 255min keys-this type is used to compare values with minimum BSON elements Max key 127Max keys-this type is used to compare values with maximum BSON elements

Data type

MongoDB supports the following data types

$type

The $type operator retrieves the matching data types in the collection based on the BSON type and returns the result

Look for x with a numeric type and $type of 1 for the number

Look for x with a value of type string, and the $type of the string is 2

Find the x of the Boolean type, and the $type of the Boolean is 8

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