Re: Inserting rpt content from a file into a table column in json format.

On 2024-04-21 19:34 +0200, Salim KOC wrote:
> I have a 5gb rpt file.
> Rpt file content is as follows:
>
>
> (base) skoc(at)skoc ~ % head -5 '/Users/skoc/postgresql/lx/lxRo.rpt'
> lxOid|lxFlags|lxType|lxFromLat|lxFromId|lxToLat|lxToId|lxCrDate|lxRelRul|lxModDate|lxOwner|lxAltOwn1|lxAltOwn2|lxTenant|lxDOV|lxIOV|lxToType
> -2147483508|67108864|-542076010|341897887|-40640797|341897887|-40639830|2020-01-24 11:14:52.000|1|2020-01-24 11:14:52.000|-1062416028|-655292577|-1283415274|1|1|1|-2099227551
> -2147483247|67108864|-366961227|341897887|-1257644257|341897887|1179980124|2023-04-26 07:43:53.000|1|2023-04-26 07:43:53.000|-1536708294|-655292577|-2119128014|1|-1071039821|-1071043321|708897621
> -2147483213|67108864|1076431157|341897887|1128100732|341897887|1128103344|2021-02-05 13:48:55.000|1|2021-02-05 13:48:55.000|-1400837562|-655292577|54575254|1|1|1|-1487879320
> -2147482748|67108864|-1075776416|341897887|-215312115|341897887|-215311217|2022-01-24 07:31:56.000|1|2022-01-24 07:31:56.000|1282737577|-655292577|54575254|1|1|1|-60774595
>
> Delimiters is “|”
> Current posttgresql version:
> PostgreSQL 16.2 on x86_64-apple-darwin20.6.0, compiled by Apple clang version 12.0.5 (clang-1205.0.22.9), 64-bit
> plm=# show work_mem;
> work_mem
> ----------
> 16MB
> (1 row)
>
>
> I created a table with the following command.
>
> CREATE TABLE IF NOT EXISTS public.lxbo
> (
> c1 serial NOT NULL,
> c2 jsonb NOT NULL,
> CONSTRAINT lxbo_pkey PRIMARY KEY (c1)
> )
>
> The process I want to do:
> insert the data whose content is specified above into column c2 in jsonb format.

You did not say how the jsonb should look. I assume you want a separate
row for each line in the rpt file and use the same property names as in
the header row.

> 1-How should the rpt file content be converted to jsonb format?
> 2-What is the way to import the relevant jsonb file into the table I specified?

Because the rpt file looks like CSV, I'd create a temporary table with
the same columns as in the rpt file and load the file with \copy:

CREATE TEMP TABLE tmp_lxbo (...);
\copy tmp_lxbo from '/Users/skoc/postgresql/lx/lxRo.rpt' (format csv, delimiter '|', header match)

Then convert the tmp_lxbo rows with to_jsonb:

INSERT INTO public.lxbo (c2) SELECT to_jsonb(lxbo_raw.*) FROM tmp_lxbo;

> 3-Do I need to update the work_mem value and/or any other value?

No, not for this import process. work_mem is relevant for query
operations such as sorting and merging.

--
Erik