JSON can only directly represent a subset of the types supported by BSON.To preserve type information, MongoDB adds the following extensions to the JSON format. Without this option, these anchors match at beginning or end of the string. The reference counts used to implement this do not use locking, so copying and destroying BSONObj's are not thread-safe operations. C++ representation of a "BSON" object – that is, an extended JSON-style object in a binary representation. You will find the Extended Reference pattern most useful when your application is experiencing lots of JOIN operations to bring together frequently accessed data. Chapter 1. “Extended” capability to ignore all white space characters in the pattern unless escaped or included in a character class. Extended support for MongoDB 3.2 and MongoDB 3.4 aggregation operators ... Providing dedicated wrapper types for collections is a commonly used pattern to provide an API for a query result that returns multiple elements. To Embed or Reference When building a new application, often one of the first things you’ll want to do is to design its data model. Note that BSONObj's have a smart pointer capability built in – so you can pass them around by value. Data duplication. This specification defines the canonical format for representing each BSON type in the Extended JSON format. Pros. Extended Reference. The following page discusses MongoDB Extended JSON v2. Extended support for MongoDB 3.2 and MongoDB 3.4 aggregation ... Providing dedicated wrapper types for collections is a commonly used pattern to provide API on a query execution result that returns multiple elements. : m: For patterns that include anchors (i.e. Additionally, it ignores characters in-between and including an un-escaped hash/pound ( # ) character and the next new line, so that you may include comments in complicated patterns. ^ for the start, $ for the end), match at the beginning or end of each line for strings with multiline values. See bsonspec.org. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. The sales collection uses the Extended Reference pattern to hold both the items sold and their details as well as information on the customer who purchased these items. MongoDB Extended JSON is a string format for representing BSON documents. In relational databases … - Selection from MongoDB Applied Design Patterns [Book] Thus, a tool that implements Extended JSON will be able to parse the output of any tool that emits Canonical Extended JSON. Faster reads and a reduction in the overall number of JOINs. For an example, see Perform Case-Insensitive Regular Expression Match. JSON can only directly represent a subset of the types supported by BSON. There are no additional indexes. Option Description Syntax Restrictions; i: Case insensitivity to match upper and lower cases. Teams. 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