I want to create a new table with plpgsql, but I want that the user gives the name of the table.My code generate a table with the name of tbname
this is my code:
CREATE OR REPLACE FUNCTION "Object_gen"(tablename text)
RETURNS void AS
$BODY$DECLARE
tbname text;
BEGIN
tbname:=tablename;
CREATE TABLE tbname(Surrogat uuid);
END$BODY$
LANGUAGE plpgsql;
How can I solve my problem? somehow that the name of my table comes from the user
You need to use dynamic SQL:
CREATE OR REPLACE FUNCTION "Object_gen"(tablename text)
RETURNS void AS
$BODY$
BEGIN
execute 'CREATE TABLE '||tablename||' (Surrogat uuid)';
END
$BODY$
LANGUAGE plpgsql;
Related
I have a simple Postgres function where I want to take table_name as a parameter and pass it into an argument and delete the data from table by condition.
CREATE OR REPLACE FUNCTION cdc.audit_refresh(tablename text)
RETURNS integer AS
$$
BEGIN
delete from tablename where id<4;
RETURN(select 1);
END;
$$ LANGUAGE plpgsql;
select cdc.audit_refresh('cdc.adf_test');
But it throws out an error that tablename
ERROR: relation "tablename" does not exist in the delete statement.(refer snapshot)
What you want to achieve is to execute Dynamic SQL statements. You can do this with EXECUTE. See more here
CREATE OR REPLACE FUNCTION audit_refresh(tablename text)
RETURNS integer AS
$$
DECLARE
stmt TEXT;
BEGIN
stmt = 'delete from '||tablename||' where id<4;';
EXECUTE stmt;
RETURN 1;
END
$$ LANGUAGE plpgsql;
Below is a simplified postgres stored procedure I am trying to run:
create or replace procedure my_schema.tst(suffix varchar)
as $$
begin
execute(' select *
into my_schema.MyTable_'||suffix||'
From my_schema.MyTable
');
end;
$$
language plpgsql;
When I attempt to run using something like:
call my_schema.tst('test');
I get this error Invalid operation: EXECUTE of SELECT ... INTO is not supported;
Is it possible to execute a dynamic query that creates a new table? I have seen examples that look like:
Execute('... some query ...') into Table;
but for my use case I need the resulting tablename to be passed as a variable.
In PostgreSQL you can use INSERT INTO tname SELECT...
create or replace procedure my_schema.tst(suffix varchar)
as $$
begin
execute ' INSERT INTO my_schema.MyTable_'||suffix||' SELECT *
FROM my_schema.MyTable
';
end;
$$
language plpgsql;
or Use CREATE TABLE tname AS SELECT..., :
create or replace procedure my_schema.tst(suffix varchar)
as $$
begin
execute ' CREATE TABLE my_schema.MyTable_'||suffix||' as SELECT *
FROM my_schema.MyTable
';
end;
$$
language plpgsql;
I want to create a table view using a function that returns a temporary table...
For example, I have a function.
create or replace function colpivot(
out_table varchar
) returns void as $$
declare
in_table varchar;
begin
create table as select * from employees;
end;
Now I want to create a view using the temporary table (out_table) given by above function...
Is there a way to do this?
I would modify your query as follows
create or replace function colpivot(
out_table varchar ) returns void as $$
begin
select * from employees into out_table ;
execute 'CREATE OR REPLACE VIEW newView AS ' || out_table;
end;
$$ LANGUAGE plpgsql;
I am trying to get the data from the Database use function of select prison();.but i got error .Please advise me.
CREATE OR REPLACE FUNCTION prison() RETURNS refcursor AS $$
DECLARE
ref refcursor;
BEGIN
OPEN ref FOR SELECT round,ben_sc,ben_st FROM prison_issue;
RETURN ref;
END;
$$ LANGUAGE plpgsql;
and calling like this
select prison();
also i tried.but cannot executed the rows.
BEGIN;
SELECT prison();
-- Returns: <unnamed portal 2>
FETCH ALL IN "<unnamed portal 24>";
COMMIT;
There is no need for a PL/pgSQL function for this:
CREATE OR REPLACE FUNCTION prison()
RETURNS setof prison_issue
AS $$
SELECT * FROM prison_issue;
$$ LANGUAGE sql;
You also need to use:
select * from prison();
to retrieve the data, do not use select prison() (which only returns a single record, not multiple rows)
You didn't show us your definition of the table prison_issue if you don't want to return all columns you need something like this:
CREATE OR REPLACE FUNCTION prison()
RETURNS table (round integer, ben_sc text, ben_st text)
AS $$
SELECT SELECT round,ben_sc,ben_st FROM prison_issue;
$$ LANGUAGE sql;
You will need to adjust the part table (round integer, ben_sc text, ben_st text) to match the data type of the columns you select.
Below is an example code.I have assumed the data types.Replace with the real ones.
CREATE OR REPLACE FUNCTION prison() RETURNS TABLE(round numeric,ben_sc character varying,ben_st character varying) AS $$
BEGIN
RETURN QUERY SELECT p.round,p.ben_sc,p.ben_st FROM prison_issue p;
END;
$$ LANGUAGE plpgsql;
I want to create a schema with with a name passed by variable.
Example:
CREATE OR REPLACE FUNCTION test1("name" character varying)
RETURNS void AS
'CREATE SCHEMA "name";'
LANGUAGE 'sql' VOLATILE
COST 100;
You could use plpgsql and than EXECUTE:
CREATE OR REPLACE FUNCTION test1("name" character varying)
RETURNS void AS
$$
BEGIN
EXECUTE 'CREATE SCHEMA '|| quote_ident($1); -- security
RETURN;
END;
$$
LANGUAGE plpgsql
VOLATILE
COST 20;
user search_path to change the default schema so you may easily add tables to it!
and use format with %I to escape the schema name as identifier.
like this:
CREATE OR REPLACE FUNCTION test1("name" character varying)
RETURNS void AS
$$
BEGIN
EXECUTE FORMAT('CREATE SCHEMA %I;', $1);
EXECUTE FORMAT('SET search_path TO %I;', $1);
CREATE TABLE table1(
column1 integer
);
RETURN;
END;
$$
LANGUAGE plpgsql
VOLATILE
COST 20;
Using PROCEDURE (PostgreSQL 11+)
CREATE OR REPLACE PROCEDURE create_schema( _schema text)
LANGUAGE plpgsql as
$$
BEGIN
EXECUTE format( 'CREATE SCHEMA IF NOT EXISTS %I ',_schema);
END
$$;
Call this procedure via:
call create_schema('test');