how to parse json using json_populate_recordset in postgres

Question

I have a json stored as text in one of my database row. the json data is as following

[{\"id\":67272,\"name\":\"EE_Quick_Changes_J_UTP.xlsx\"},{\"id\":67273,         


        

Answer 1

The first argument passed to pgsql function json_populate_recordsetshould be a row type. If you want to use the json array to populate the existing table anoop you can simply pass the table anoop as the row type like this:

insert into anoop
select * from json_populate_recordset(null::anoop, 
        '[{"id":67272,"name":"EE_Quick_Changes_J_UTP.xlsx"},
          {"id":67273,"name":"16167.txt"},
          {"id":67274,"name":"EE_12_09_2013_Bcum_Searchall.png"}]');

Here the null is the default value to insert into table columns not set in the json passed.

If you don't have an existing table, you need to create a row type to hold your json data (ie. column names and their types) and pass it as the first parameter, like this anoop_type:

create TYPE anoop_type AS (id int, name varchar(100));
select * from json_populate_recordset(null :: anoop_type, 
        '[...]') --same as above

Answer 2

no need to create a new type for that.

select * from json_populate_recordset(null::record,'[{"id_item":1,"id_menu":"34"},{"id_item":2,"id_menu":"35"}]')
 AS
 (
    id_item int
    , id_menu int
 )