Pgsql how to return a value from script












0















I need to return a value named tsmax from the execution of a pgsql script.



The script is executed by and ETL datasource (Pentaho). All I can do is execute a script. I can't create functions on source database.



Below is my script. I need something like select tsmax; at the end, but the script block cannot do select nor return values. (I've just replaced all calculations with a label "do some process to calculate tsmax" to simplify the example).



do $$

declare tsmax timestamp;

begin

    -- do some process to calculate tsmax

    -- do some process to calculate tsmax

    tsmax = now();



    -- i want to return value tsmax

    select tsmax; -- this is an ERROR!

end $$ language plpgsql;


Thanks






postgresql plpgsql







share|improve this question

























  • You can use select now() outside of the script - that value does not change inside of a single transaction

    – a_horse_with_no_name
    Nov 13 '18 at 11:34













  • "tsmax = now()" is an example! The real code to calculate tsmax is longer, with cursor and executing scripts.

    – Radioleao
    Nov 13 '18 at 11:40
















0















I need to return a value named tsmax from the execution of a pgsql script.



The script is executed by and ETL datasource (Pentaho). All I can do is execute a script. I can't create functions on source database.



Below is my script. I need something like select tsmax; at the end, but the script block cannot do select nor return values. (I've just replaced all calculations with a label "do some process to calculate tsmax" to simplify the example).



do $$

declare tsmax timestamp;

begin

    -- do some process to calculate tsmax

    -- do some process to calculate tsmax

    tsmax = now();



    -- i want to return value tsmax

    select tsmax; -- this is an ERROR!

end $$ language plpgsql;


Thanks






postgresql plpgsql







share|improve this question

























  • You can use select now() outside of the script - that value does not change inside of a single transaction

    – a_horse_with_no_name
    Nov 13 '18 at 11:34













  • "tsmax = now()" is an example! The real code to calculate tsmax is longer, with cursor and executing scripts.

    – Radioleao
    Nov 13 '18 at 11:40














0












0








0








I need to return a value named tsmax from the execution of a pgsql script.



The script is executed by and ETL datasource (Pentaho). All I can do is execute a script. I can't create functions on source database.



Below is my script. I need something like select tsmax; at the end, but the script block cannot do select nor return values. (I've just replaced all calculations with a label "do some process to calculate tsmax" to simplify the example).



do $$

declare tsmax timestamp;

begin

    -- do some process to calculate tsmax

    -- do some process to calculate tsmax

    tsmax = now();



    -- i want to return value tsmax

    select tsmax; -- this is an ERROR!

end $$ language plpgsql;


Thanks






postgresql plpgsql







share|improve this question
















I need to return a value named tsmax from the execution of a pgsql script.



The script is executed by and ETL datasource (Pentaho). All I can do is execute a script. I can't create functions on source database.



Below is my script. I need something like select tsmax; at the end, but the script block cannot do select nor return values. (I've just replaced all calculations with a label "do some process to calculate tsmax" to simplify the example).



do $$

declare tsmax timestamp;

begin

    -- do some process to calculate tsmax

    -- do some process to calculate tsmax

    tsmax = now();



    -- i want to return value tsmax

    select tsmax; -- this is an ERROR!

end $$ language plpgsql;


Thanks






postgresql plpgsql




postgresql plpgsql






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 13 '18 at 11:33









a_horse_with_no_name

293k46447541




293k46447541










asked Nov 13 '18 at 11:32









RadioleaoRadioleao

157213




157213













  • You can use select now() outside of the script - that value does not change inside of a single transaction

    – a_horse_with_no_name
    Nov 13 '18 at 11:34













  • "tsmax = now()" is an example! The real code to calculate tsmax is longer, with cursor and executing scripts.

    – Radioleao
    Nov 13 '18 at 11:40



















  • You can use select now() outside of the script - that value does not change inside of a single transaction

    – a_horse_with_no_name
    Nov 13 '18 at 11:34













  • "tsmax = now()" is an example! The real code to calculate tsmax is longer, with cursor and executing scripts.

    – Radioleao
    Nov 13 '18 at 11:40

















You can use select now() outside of the script - that value does not change inside of a single transaction

– a_horse_with_no_name
Nov 13 '18 at 11:34







You can use select now() outside of the script - that value does not change inside of a single transaction

– a_horse_with_no_name
Nov 13 '18 at 11:34















"tsmax = now()" is an example! The real code to calculate tsmax is longer, with cursor and executing scripts.

– Radioleao
Nov 13 '18 at 11:40





"tsmax = now()" is an example! The real code to calculate tsmax is longer, with cursor and executing scripts.

– Radioleao
Nov 13 '18 at 11:40












1 Answer
1






active

oldest

votes


















1














You should to store value to session variable, and after execution of anonymous block, you can read this value:



[pavel@nemesis ~]$ echo "do $$ begin perform set_config('myvars.myvar', current_date::text, false); end $$; select current_setting('myvars.myvar'); " | psql -At postgres

DO

2018-11-13


DO command doesn't support any form of return value.






share|improve this answer
























  • I can set config var even if I have only select grants on a database?

    – Radioleao
    Nov 13 '18 at 15:36











  • @Radioleao yes, but you have to use some prefix like 'myvars.'

    – Pavel Stehule
    Nov 13 '18 at 16:45











  • It is good solution. Unfortunatly, it doesn't work with ETL Pentaho (table input task): it returns the error message "No result returned by the query". I don't know why, but I guess it's because the first statement (do block) doesn't return data.

    – Radioleao
    Nov 14 '18 at 9:16











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1 Answer
1






active

oldest

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1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









1














You should to store value to session variable, and after execution of anonymous block, you can read this value:



[pavel@nemesis ~]$ echo "do $$ begin perform set_config('myvars.myvar', current_date::text, false); end $$; select current_setting('myvars.myvar'); " | psql -At postgres

DO

2018-11-13


DO command doesn't support any form of return value.






share|improve this answer
























  • I can set config var even if I have only select grants on a database?

    – Radioleao
    Nov 13 '18 at 15:36











  • @Radioleao yes, but you have to use some prefix like 'myvars.'

    – Pavel Stehule
    Nov 13 '18 at 16:45











  • It is good solution. Unfortunatly, it doesn't work with ETL Pentaho (table input task): it returns the error message "No result returned by the query". I don't know why, but I guess it's because the first statement (do block) doesn't return data.

    – Radioleao
    Nov 14 '18 at 9:16
















1














You should to store value to session variable, and after execution of anonymous block, you can read this value:



[pavel@nemesis ~]$ echo "do $$ begin perform set_config('myvars.myvar', current_date::text, false); end $$; select current_setting('myvars.myvar'); " | psql -At postgres

DO

2018-11-13


DO command doesn't support any form of return value.






share|improve this answer
























  • I can set config var even if I have only select grants on a database?

    – Radioleao
    Nov 13 '18 at 15:36











  • @Radioleao yes, but you have to use some prefix like 'myvars.'

    – Pavel Stehule
    Nov 13 '18 at 16:45











  • It is good solution. Unfortunatly, it doesn't work with ETL Pentaho (table input task): it returns the error message "No result returned by the query". I don't know why, but I guess it's because the first statement (do block) doesn't return data.

    – Radioleao
    Nov 14 '18 at 9:16














1












1








1







You should to store value to session variable, and after execution of anonymous block, you can read this value:



[pavel@nemesis ~]$ echo "do $$ begin perform set_config('myvars.myvar', current_date::text, false); end $$; select current_setting('myvars.myvar'); " | psql -At postgres

DO

2018-11-13


DO command doesn't support any form of return value.






share|improve this answer













You should to store value to session variable, and after execution of anonymous block, you can read this value:



[pavel@nemesis ~]$ echo "do $$ begin perform set_config('myvars.myvar', current_date::text, false); end $$; select current_setting('myvars.myvar'); " | psql -At postgres

DO

2018-11-13


DO command doesn't support any form of return value.







share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 13 '18 at 14:44









Pavel StehulePavel Stehule

22.5k34857




22.5k34857













  • I can set config var even if I have only select grants on a database?

    – Radioleao
    Nov 13 '18 at 15:36











  • @Radioleao yes, but you have to use some prefix like 'myvars.'

    – Pavel Stehule
    Nov 13 '18 at 16:45











  • It is good solution. Unfortunatly, it doesn't work with ETL Pentaho (table input task): it returns the error message "No result returned by the query". I don't know why, but I guess it's because the first statement (do block) doesn't return data.

    – Radioleao
    Nov 14 '18 at 9:16



















  • I can set config var even if I have only select grants on a database?

    – Radioleao
    Nov 13 '18 at 15:36











  • @Radioleao yes, but you have to use some prefix like 'myvars.'

    – Pavel Stehule
    Nov 13 '18 at 16:45











  • It is good solution. Unfortunatly, it doesn't work with ETL Pentaho (table input task): it returns the error message "No result returned by the query". I don't know why, but I guess it's because the first statement (do block) doesn't return data.

    – Radioleao
    Nov 14 '18 at 9:16

















I can set config var even if I have only select grants on a database?

– Radioleao
Nov 13 '18 at 15:36





I can set config var even if I have only select grants on a database?

– Radioleao
Nov 13 '18 at 15:36













@Radioleao yes, but you have to use some prefix like 'myvars.'

– Pavel Stehule
Nov 13 '18 at 16:45





@Radioleao yes, but you have to use some prefix like 'myvars.'

– Pavel Stehule
Nov 13 '18 at 16:45













It is good solution. Unfortunatly, it doesn't work with ETL Pentaho (table input task): it returns the error message "No result returned by the query". I don't know why, but I guess it's because the first statement (do block) doesn't return data.

– Radioleao
Nov 14 '18 at 9:16





It is good solution. Unfortunatly, it doesn't work with ETL Pentaho (table input task): it returns the error message "No result returned by the query". I don't know why, but I guess it's because the first statement (do block) doesn't return data.

– Radioleao
Nov 14 '18 at 9:16


















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