Json and Jsonpath in Postgres 12
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The document outlines updates and features in PostgreSQL 12, including significant enhancements to JSON querying with jsonpath support and jsquery functionality. It discusses EDB's leadership in open-source PostgreSQL software and highlights their extensive customer base and contributions to the community. The agenda includes installation guides, live demos, and upcoming events related to Postgres.
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![Comparison: variables
13
jsquery jsonpath Description
$ $ The whole document
. . Accessor
* * All values at the current level
N/A ** All values at all levels
#N $[N] Nth value of an array starting at 0
N/A $[start,end] Slice of an array
# Alternative All array elements
% Alternative All object keys](https://image.slidesharecdn.com/jsonandjsonpathinpostgres12-191023153520/85/Json-and-Jsonpath-in-Postgres-12-13-320.jpg)
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- 1. © Copyright EnterpriseDB Corporation, 2019. All rights reserved.1
- 2. Pulse of Postgres © Copyright EnterpriseDB Corporation, 2019. All rights reserved.2 What’s new in Postgres 12 August 28 Installing Postgres on Linux September 11 Installing Postgres in Containers September 25 Installing Postgres on Windows October 9 JSON and JSONPATH in Postgres 12 October 23 Programming the SQL Way with Common Table Expressions November 6 Deploying highly available Postgres using Kubernetes Operators November 20
- 3. JSON and JSONPATH in Postgres 12 A step-by-step approach Thom Brown, Principal Support Engineer Marc Linster, SVP, Product Development and Support © Copyright EnterpriseDB Corporation, 2019. All rights reserved.3
- 4. Agenda ● Who is EDB? ● The EDB Postgres Platform ● JSON, JSONB and JSONPATH ● Demo ● Q & A ● What’s next in Pulse on Postgres? © Copyright EnterpriseDB Corporation, 2019. All rights reserved.4
- 5. WHO IS EDB? The world leader in open-source based Postgres software and services 5 • Founded in 2004 • Recognized RDBMS leader by: • Gartner • Forrester • Customer base > 4000 • 300+ employees • Offices worldwide • Largest PostgreSQL community leader
- 6. ONLY OPEN SOURCE BASED RDBMS IN GARTNER MQ EDB Recognized 6 Years In A Row on Gartner’s Magic Quadrant 6
- 7. 7 Customers working SMARTER, reducing RISK and being more PRODUCTIVE with EDB. OVER 4,000 CUSTOMERS U.S Customers EMEA Customers APAC Customers 102 of the Fortune 500 337 of the Forbes Global 2000
- 8. EDB OPEN SOURCE LEADERSHIP NAMED EDB OPEN SOURCE COMMITTERS AND CONTRIBUTORS 8 • CORE TEAM • • • • MAJOR CONTRIBUTORS • CONTRIBUTORS Akshay Joshi Amul Sul Ashesh Vashi Dilip Kumar Jeevan Ladhe Mithun Cy Andres Freund Devrim Gündüz Amit Kapila Bruce Momjian Dave Page Robert Haas Ashutos h Sharma Rushabh Lathia - designates committers
- 9. jsquery & SQL/JSON 9 jsquery and SQL/JSON provide way to query and retrieve JSON data using expressions passed to a function or specialised operator.
- 10. jsquery 10 • Introduced for PostgreSQL 9.4 and later • Provided way to query and index JSON data • External project not available in-core • Not officially supported • Introduced in PostgreSQL 12 • Provides a way to query and index JSON data • In-core and officially supported • Standards-compliant SQL/JSON Both operate on JSONB (binary-represented JSON), and not plain JSON.
- 11. Installation 11 jsquery SQL/JSON • Install or compile extension • Load extension into specific database • Use extension types and functions • Use built-in types and functions
- 12. SQL/JSON functions 12 Function Operator Description jsonb_path_exists @? Match returns true, false if unmatched, null if it targeted a missing value. jsonb_path_match @@ Same but only first result item is tested. jsonb_path_query None Returns JSON data resulting from expression. jsonb_path_query_array None Same but in an array. jsonb_path_query_first None Same but only first value.
- 13. Comparison: variables 13 jsquery jsonpath Description $ $ The whole document . . Accessor * * All values at the current level N/A ** All values at all levels #N $[N] Nth value of an array starting at 0 N/A $[start,end] Slice of an array # Alternative All array elements % Alternative All object keys
- 14. Comparison: methods 14 jsquery jsonpath Description N/A + and - (unary) Plus / minus operator on a sequence N/A + and - (binary) Addition / subtraction N/A * and / Multiplication / division IS <type> type() Checks the type (jsquery) or returns the type name (jsonpath) @# size() Size (length) of an array N/A double(), ceiling(), floor(), abs(), keyvalue() Math operations, and keyvalue() returns the object represented as a sequence of key, value and id fields.
- 15. Comparison: operators 15 jsquery jsonpath Description =,<,<=,>,>= ==,<,<=,>,>= Equality, less than, etc. @>,<@ Available at SQL level Contains / contained in IN Alternative Multiplication / division && Available at SQL level Checks the type (jsquery) or returns the type name (jsonpath) AND,OR,NOT &&,||,! Boolean AND, OR and NOT. =* exists Expression contains 1 or more items N/A starts with Value begins with the specified value N/A like_regex Test string against regular expression
- 16. Comparison: special values 16 jsquery jsonpath Description true true Boolean true false false Boolean false null null Null value (not the same as SQL null) N/A is unknown Unknown result
- 17. Examples 17
- 18. Q & A © Copyright EnterpriseDB Corporation, 2019. All rights reserved.18
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