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Postgresql 11 - Create Procedure to Execute COPY function


By : user2174649
Date : October 17 2020, 08:10 PM
should help you out If you use name without single quotes, it is interpreted as a column name in the (tacit) SELECT statement
code :
SELECT format('...', name, '...')


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Create copy of PostgreSQL internal C function and load it as user defined function


By : KingCLF
Date : March 29 2020, 07:55 AM
To fix this issue The reason the psql client is asking if you wish to reconnect is because the backend is segfaulting, as per the comments.
It would be possible to collect a core dump from such a crash and examine it with a debugger (eg. gdb) to find out exactly where it is crashing. However, my best guess is that it is crashing because you have taken a big file written to be a core component of postgresql, compiled it up separately, and attempted to load it in as an extension module.
code :
#include "postgres.h"
#include "fmgr.h"
#include "utils/array.h"

#ifdef PG_MODULE_MAGIC
PG_MODULE_MAGIC;
#endif

typedef struct Int8TransTypeData
{
    int64       count;
    int64       sum;
} Int8TransTypeData;

PG_FUNCTION_INFO_V1(int2_avg_accum2);

Datum
int2_avg_accum2(PG_FUNCTION_ARGS)
{
    ArrayType  *transarray;
    int16       newval = PG_GETARG_INT16(1);
    Int8TransTypeData *transdata;

    /*
     * If we're invoked as an aggregate, we can cheat and modify our first
     * parameter in-place to reduce palloc overhead. Otherwise we need to make
     * a copy of it before scribbling on it.
     */
    if (AggCheckCallContext(fcinfo, NULL))
        transarray = PG_GETARG_ARRAYTYPE_P(0);
    else
        transarray = PG_GETARG_ARRAYTYPE_P_COPY(0);

    if (ARR_HASNULL(transarray) ||
        ARR_SIZE(transarray) != ARR_OVERHEAD_NONULLS(1) + sizeof(Int8TransTypeData))
        elog(ERROR, "expected 2-element int8 array");

    transdata = (Int8TransTypeData *) ARR_DATA_PTR(transarray);
    transdata->count++;
    transdata->sum += newval;

    PG_RETURN_ARRAYTYPE_P(transarray);
}
gcc -I/usr/pgsql-9.2/include/server -fPIC -c my_avg_accum.c
gcc -shared -o my_avg_accum.so my_avg_accum.o

How to create copy trigger function in PostgreSQL?


By : siddharth joshi
Date : March 29 2020, 07:55 AM
Does that help I have a table , Are you looking for something like this?
code :
CREATE OR REPLACE FUNCTION save_order_in_history()
  RETURNS trigger
AS $$
BEGIN
  INSERT INTO order_history(order_id, total_price, product_amount)
  VALUES (NEW.id, NEW.total_price, NEW.product_amount);
  RETURN NULL;
END $$ LANGUAGE plpgsql;

CREATE TRIGGER order_trigger AFTER INSERT OR UPDATE
ON "order" FOR EACH ROW EXECUTE PROCEDURE save_order_in_history();

Execute postgreSQL stored procedure as one transaction


By : Mike Mirren
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Well, basically stored procedures are atomic in nature and executed as one transaction.
code :
CREATE TABLE xxx (id int PRIMARY KEY);

CREATE OR REPLACE FUNCTION f() RETURNS void AS $$
DECLARE
  len int;
BEGIN
  RAISE NOTICE 'Transaction ID: %', TXID_CURRENT();
  INSERT INTO xxx VALUES (1);

  RAISE NOTICE 'Transaction ID: %', TXID_CURRENT();
  INSERT INTO xxx VALUES (2);

  RAISE NOTICE 'Transaction ID: %', TXID_CURRENT();
  SELECT COUNT(*) FROM xxx INTO len;
  RAISE NOTICE 'Number of records: %', len;

  RAISE NOTICE 'Transaction ID: %', TXID_CURRENT();

  -- results in unique constraint violation
  UPDATE xxx SET id = 3;
END;
$$ LANGUAGE plpgsql;
stackoverflow=# show autocommit;
 autocommit 
------------
 on
(1 row)

stackoverflow=# SELECT f();
NOTICE:  Transaction ID: 15086
NOTICE:  Transaction ID: 15086
NOTICE:  Transaction ID: 15086
NOTICE:  Number of records: 2
NOTICE:  Transaction ID: 15086
ERROR:  duplicate key value violates unique constraint "xxx_pkey"
DETAIL:  Key (id)=(3) already exists.
CONTEXT:  SQL statement "UPDATE xxx SET id = 3"
PL/pgSQL function f() line 20 at SQL statement

stackoverflow=# SELECT * FROM xxx;
id 
----
(0 rows)

is it possible to create trigger without execute procedure in postgresql?


By : Steven Bardos
Date : March 29 2020, 07:55 AM
will be helpful for those in need Every RDBMS have their own SQL language. You can't create trigger in PostgreSQL as you can create in Oracle/MS SQL etc. In order to create trigger in PostgreSQL you have to
Create a function in PostgreSQL with you BL Create a trigger and associate your function with this trigger.

Create procedure to execute query in PostgreSQL


By : Jaroslav Machaň
Date : March 29 2020, 07:55 AM
This might help you This technique is named dynamic SQL. PLpgSQL has EXECUTE statement for this case. Probably is useless to write special function just for this, because EXECUTE is one line command.
code :
CREATE OR REPLACE FUNCTION runstatement(statement TEXT)
RETURNS void AS $$
BEGIN
  IF statement <> '' THEN
    EXECUTE statement;
  END IF;
END;
$$ LANGUAGE plpgsql;
SELECT runstatement(''); -- outside plpgsql
PERFORM runstatement('') -- inside plpgsql
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