使用PostgreSQL的JSONB数据类型进行高效查询的示例代码

CREATE TABLE my_table (
    id serial PRIMARY KEY,
    data jsonb
);

INSERT INTO my_table (data) VALUES 
('{"name": "John", "age": 30, "city": "New York"}'),
('{"name": "Jane", "age": 25, "city": "San Francisco"}');

CREATE INDEX idxgin ON my_table USING gin(data);

SELECT * FROM my_table WHERE data ? 'name';

SELECT * FROM my_table WHERE data ->> 'name' = 'John';

SELECT * FROM my_table WHERE data #>> '{address, city}' = 'New York';

SELECT * FROM my_table WHERE data @> '{"age": 30}';

-- 创建表
CREATE TABLE my_table (
    id serial PRIMARY KEY,
    data jsonb
);

-- 插入数据
INSERT INTO my_table (data) VALUES 
('{"name": "John", "age": 30, "city": "New York"}'),
('{"name": "Jane", "age": 25, "city": "San Francisco"}'),
('{"name": "Bob", "age": 35, "address": {"city": "Los Angeles", "state": "CA"}}');

-- 创建GIN索引
CREATE INDEX idxgin ON my_table USING gin(data);

-- 查询包含name键的文档
SELECT * FROM my_table WHERE data ? 'name';

-- 查询name为John的文档
SELECT * FROM my_table WHERE data ->> 'name' = 'John';

-- 查询address.city为Los Angeles的文档
SELECT * FROM my_table WHERE data #>> '{address, city}' = 'Los Angeles';

-- 查询age大于25的文档
SELECT * FROM my_table WHERE data ->> 'age'::text::int > 25;