Обсуждение: Extracting JSON data into columns

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Extracting JSON data into columns

От
"Ferrell, Denise SDC"
Дата:
Running PostgreSQL 9.3 on Linux.
 
I'm looking for the syntax to extract JSON values into columns from one incoming column in file.
 
Thank you in advance.
Denise

Re: Extracting JSON data into columns

От
"David G. Johnston"
Дата:
On Mon, Feb 22, 2016 at 7:48 AM, Ferrell, Denise SDC <denise.ferrell@sdc-world.com> wrote:
Running PostgreSQL 9.3 on Linux.
 
I'm looking for the syntax to extract JSON values into columns from one incoming column in file.
 
Thank you in advance.
Denise

​Syntax is well documented:

​http://www.postgresql.org/docs/9.3/interactive/functions-json.html

​Not tested...​

​WITH json_data (jd) AS (
VALUES ('{"key":"value", "key2":"value2"}'::json)
)​
​SELECT jd->>'key' AS col1, jd->>'key2' AS col2
FROM json_data​

Also useful is the:

json_populate_record(...)

function.

Try them and ask specific questions if you still have them.  Incorporating a self-contained example like mine lowers the bar for others to provide useful help.

Also consider upgrading to 9.5 if you expect to do heavy JSON work - features for this type have been being added at a good clip these past couple of years.

David J.