Re: PL/pgSQL Copy data from one table to another

On Wed, Feb 5, 2014 at 7:53 AM, George Ant <g(dot)antonopoulos000(at)gmail(dot)com>wrote:

> Hey Guys,
>
> I am trying to copy data from one table to another using plpgsql. The two
> tables have different structure cause the new one is object-table. My
> function is this :
>
> CREATE OR REPLACE FUNCTION copy_customers() RETURNS integer as $BODY$
> DECLARE
> idcounter integer := 1;
> firstname text;
> lastname text;
> address1 text;
> address2 text;
> city text;
> state text;
> zip text;
> country text;
> region text;
> BEGIN
> FOR idcounter In 1..20000
> LOOP
>
> -- Add the values into the variables.
> SELECT
>
> "FirstName","LastName","Address1","Address2","City","State","Zip","Country","Region"
> INTO firstname,
> lastname,address1,address2,city,state,zip,country,region
> FROM "Customers"
> WHERE "CustomerId" = idcounter;
>
> --Insert the variables to the new table.
> INSERT INTO "Customers_object_table" (customerid , firstname,
> lastname,
> address)
>
> VALUES(idcounter,firstname,lastname,(address1,address2,city,state,zip,country,region));
> END Loop;
>
> return 1;
> END;
> $BODY$
> LANGUAGE plpgsql;
>
>
> This function is working fine, but the problem is that the table
> "Customers"
> has more than 20 columns, so the code is ugly and unmaintainable. Also I
> want to do the same job for 10 more tables.
>
> Can somebody help me to change this function in a way that I won't have to
> declare the columns?
>
> Notice that the destination-tables are object tables and can be different
> than the old tables, so I am not sure if what I ask is possible.
>
> Kind Regards,
> George Ant
>
>
>
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I assume you created a composite type (addresstype) in
Customers_object_table.

CREATE OR REPLACE FUNCTION copy_customers() RETURNS integer as $BODY$
BEGIN

INSERT INTO Customers_object_table (customerid, firstname, lastname,
address)
SELECT c.customerid, c.firstname, c.lastname, (c.address1, c.address2,
c.city, c.zip, c.country, c.region)::addresstype
FROM Customers c
WHERE c.customerid >= 1 AND c.customerid <= 20000;

RETURN 1;
END
$BODY$
LANGUAGE plpgsql;