How To Call A Stored Procedure/Function From A Trigger Function In Postg...

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Working with triggers is fun and learning. There are endless possibilities that can be achieved through Triggers.

This time, I have explained the usage of Triggers to call other stored procedures or functions in PostgreSQL Trigger Functions.

#trigger #procedure #function #postgresql #database

CREATE TABLE students

(

    roll numeric(10,0),

    name character varying(30),

    course character varying(30)

);

CREATE OR REPLACE PROCEDURE 

trigger_proc(in_value1 IN numeric, in_value2 IN numeric, out_result OUT numeric)

LANGUAGE 'plpgsql'

AS $BODY$

Declare

lv_msg CHARACTER varying(100);

Begin

  out_result := in_value1 + in_value2;

exception

when others then

lv_msg := 'Error : '||sqlerrm;

raise notice '%',lv_msg;

end;

$BODY$;

CREATE OR REPLACE FUNCTION 

trigger_func(in_value1 IN numeric, in_value2 IN numeric) returns numeric

LANGUAGE 'plpgsql'

AS $BODY$

Declare

lv_msg CHARACTER varying(100);

out_result numeric (10);

Begin

  out_result := in_value1 + in_value2;

return out_result;

exception

when others then

lv_msg := 'Error :'||sqlerrm;

raise notice '%',lv_msg;

end;

$BODY$;

CREATE OR REPLACE FUNCTION student_logs_trg_func()

    RETURNS TRIGGER

    LANGUAGE 'plpgsql'

AS $BODY$

declare

lv_out_proc numeric(10);

lv_out_func numeric(10);

begin

call trigger_proc(50, 50, lv_out_proc);

lv_out_func := trigger_func(100, 100);

raise notice 'Proc Output: %',lv_out_proc;

raise notice 'Func Output: %',lv_out_func;

return new;

end;

$BODY$;

CREATE TRIGGER student_trg

    BEFORE INSERT OR DELETE OR UPDATE 

    ON students

    FOR EACH ROW

    EXECUTE FUNCTION student_logs_trg_func();

Insert into students values (1, 'Akram', 'MCA');

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