PostgreSQL hstore: 저장 json 结构数据

开启 hstore extension

表结构

CREATE TABLE books (
 id serial primary key,
 title VARCHAR (255),
 attr hstore
);

쏟아지는 수

INSERT INTO books (title, attr)
VALUES
 (
 'PostgreSQL Tutorial',

  '
    "paperback" => "243",
    "publisher" => "postgresqltutorial.com",
    "language"  => "English",
    "ISBN-13"   => "978-1449370000",
    "weight"    => "11.2 ounces"
  '
);

------

-- "author" => "shooter" 多了个作者

INSERT INTO books (title, attr)
VALUES
(
 'PostgreSQL Cheat Sheet',
 '
  "author" => "shooter",
  "paperback" => "5",
  "publisher" => "postgresqltutorial.com",
  "language"  => "English",
  "ISBN-13"   => "978-1449370001",
  "weight"    => "1 ounces"
 '
);

查询

SELECT attr FROM books; -- 普通查询

SELECT
 attr -> 'weight' AS weight
FROM
 books
WHERE
 attr -> 'ISBN-13' = '978-1449370000';

SELECT
 title
FROM
 books
WHERE
 attr @> '"weight"=>"11.2 ounces"' :: hstore;

업데이트

UPDATE books
SET attr = attr || '"freeshipping"=>"yes"' :: hstore;

UPDATE books
SET   attr = '"author"=>"shooter"' :: hstore;

카누제 속성

UPDATE books 
SET attr = delete(attr, 'freeshipping');