SELECT * FROM json_to_row('{"id": 1, "name": "John", "age": 30}'); 该查询将返回一个包含一行数据的结果集,其中包含id为1,name为"John",age为30的列。 对于Postgres存储过程中将JSON转换为行的应用场景,可以用于处理包含复杂数据结构的JSON数据,并将其转换为关系型
或是输JSON队列值。 postgres=# CREATE TABLE rpg_items_attack(int serial, fields int[], description text); CREATE TABLE postgres=# INSERT INTO rpg_items_attack (fields, description) VALUES postgres-# ('{500,200,10}','basic sword'); INSERT 0 1 postgres=# SELECT row_to_json(row(array_to...
Table 9-44shows the functions that are available for creatingjsonandjsonbvalues. (There are no equivalent functions forjsonb, of therow_to_jsonandarray_to_jsonfunctions. However, theto_jsonbfunction supplies much the same functionality as these functions would.) Table 9-44. JSON Creation Funct...
在PostgreSQL中，可以创建一个“GIN”（通用倒排索引）索引来索引JSONB对象中的所有属性，或者可以使用“表达式”索引来在特定JSONB元素上创建索引。CREATE INDEX ccjsonb_path_ops_idx ON cc_jsonb USING GIN (data jsonb_path_ops);SELECT * FROM cc_jsonb WHERE data @> '{"name":"First"}'::jsonbSEL...
from [String, Arel, or ActiveRecord::Relation]: A subquery that can be nested into a ROW_TO_JSON clause Options: as [Symbol or String] (default="results"): What the column will be aliased to key [Symbol or String] (default=[random letter]): Internal query alias name. This is usefu...
It applies to storage on disk as well as most representations of the value inside PostgreSQL. When multiple values are stored consecutively, such as in the representation of a complete row on disk, padding is inserted before a datum of this type so that it begins on the specified boundary. ...
perform pg_notify('gps',row_to_json(rec)::text); --SELECT gid,ST_AsGeojson(ST_AsText(s.geom)) as epg,,ST_AsGeojson(ST_AsText(NEW.geom)) as gps FROM eploygon s where st_within( OLD.geom , s.geom) into ewith; --raise notice 'data:%',row_to_json(ewith)::text; ...
as newtable ('||rowc||' varchar,'||columnlist||')';stmt=E' select array_to_json(array_agg(row_to_json(t))) from ('||dynsql2||') t ';executestmtintoresult;returnresult;end$$ 测试用表结构和数据 -- toy example to show how it works...
getUsersWithRowNumber 函数将返回一个对象数组,每个对象都包含 row_number、id、name 和age 属性。 注意:这是一个特定于 Postgres 的查询,因为 ROW_NUMBER() 是Postgres 的窗口函数。在使用其他数据库时,可能需要调整查询以适应特定的数据库函数。 相关搜索: TypeORM -使用数组参数查询数据库- Postgres? postg...
包括JSON类型的键值 3、应用场景 Postgres-XL是一个水平可扩展的开源SQL数据库集群,足够灵活,可以处理不同的数据库工作负载: OLTP密集型写入工作负载 MPP架构的并行商业智能系统 操作数据存储 键值存储 GIS地理空间 混合工作负载环境 多租户提供商托管环境