Thanx for the quick response !
Sorry for asking a bit confusing question ... Using the View is a good idea but
does not fully solve my problem. To make it a bit more clear: I want to copy
all records from table1 to table2 assuming that the two tables have exactly the
same column definition and column order. I could do that executing INSERT INTO
tablefoo1 SELECT * FROM tablefoo2;
But how can I do the copying if the column order is different between tablefoo1
and tablefoo2 ?
My approach was to dynamically assemble a string1 with all fieldnames and a
string2 with the corresponding field values row per row using a plpgsql
function. The result would be a row per row copying using INSERT INTO tablefoo1
(string1) VALUES (string2). My problem is that I not manage to read the
fieldvalues row by row.
Do you have any idea ?
Thanx a lot !
Regards
Chris
>
>Talk about obfuscated Are you trying to retrieve the table structure /
>schema from the PG System Catalogs ?
>
>If so -- you are better off using a VIEW instead of a manual procedure
>because it will automatically kepp up with the current schema definition...
>
>Try this:
>
>-- DROP VIEW sys_table_schemas;
>
>CREATE OR REPLACE VIEW sys_table_schemas AS
> SELECT pc.oid AS tbl_oid, pc.relname::character varying AS table_name,
>pa.attname::character varying AS column_name, pt.typname AS data_type,
>CASE
>WHEN substr(pt.typname::text, 1, 3)::name = 'int'::name THEN
>'integer'::name
>WHEN pt.typname = 'bool'::name THEN 'boolean'::name
>ELSE pt.typname
>END AS udt_name, pa.attnum AS ordinal_position, 254 AS str_length,
>CASE
>WHEN pa.attnotnull THEN false
>ELSE true
>END AS nulls_allowed,
>CASE
>WHEN substr(pa.attname::text, 1, 3) = 'lu_'::text THEN true
>ELSE false
>END AS lookup,
>CASE
>WHEN pd.description::character varying IS NOT NULL THEN
>pd.description::character varying
>WHEN pa.attname IS NOT NULL THEN pa.attname::character varying
>ELSE NULL::character varying
>END AS label
> FROM ONLY pg_class pc
> JOIN ONLY pg_attribute pa ON pc.oid = pa.attrelid AND pc.relnamespace =
>2200::oid AND pc.reltype > 0::oid AND (pc.relkind = 'r'::"char" OR
>pc.relkind = 'v'::"char")
> JOIN ONLY pg_type pt ON pa.atttypid = pt.oid
> LEFT JOIN ONLY pg_description pd ON pc.oid = pd.objoid AND pa.attnum =
>pd.objsubid
> WHERE pa.attnum > 0
> ORDER BY pc.relname::character varying, pa.attnum;
>
>ALTER TABLE sys_table_schemas OWNER TO "public";
>
>SELECT * FROM sys_table_schemas;
>
>
>
>
><[EMAIL PROTECTED]> wrote in message
>news:[EMAIL PROTECTED]
>> Hi,
>>
>> I user PostgreSQl 8.0.4 on Win2003 Server and write a function to copy
>> rows from one table into another table with the same column definition.
>> My first approach was to use something like:
>>
>> query_value := 'INSERT INTO ' || tabledest || ' SELECT * FROM ' ||
>> tablesrc;
>> EXECUTE query_value;
>>
>> This only works if the column definition AND the order between source and
>> destination is the same !
>> In my case I have always the same column definitions but they are not in
>> the same order between source and destination table.
>> What I tryed then is to loop through the column definition of the source
>> and query the sourcetable for the value. For that I have to execut a query
>> with dynamic tablename and dynamic columname to generate two stings one
>> with the columndefinitin and one with the columnvalues to exececute
>> something like: INSERT INTO tabelfoo (columndefinitinstring) VALUES
>> (columnvaluesstring)
>>
>> see snip of function:
>>
>> fieldvalues RECORD;
>> output RECORD;
>> insertvalues VARCHAR;
>> fieldname VARCHAR;
>>
>>
>> -- Get Attribute List from Table and write it to output
>> -- Read Values of Fieldname from source
>> query_value := 'select * from ' || tablesrc ;
>>
>> FOR fieldvalues IN EXECUTE query_value LOOP
>>
>> FOR output IN SELECT a.attnum,
>>a.attname AS field,
>>FROM
>> pg_class c, pg_attribute a, pg_type t
>>WHERE
>> c.relname = tablesrc AND
>> a.attnum > 0 AND
>> a.attrelid = c.oid AND
>> a.atttypid = t.oid
>>ORDER BY a.attnum LOOP
>>
>> -- Read Field Name from Out Table
>> fieldname := output.field;
>>
>> -- Write Field Name into Variable
>> IF insertcolumns IS NULL THEN
>> insertcolumns := fieldname;
>> ELSE
>> insertcolumns := insertcolumns || ',' || fieldname;
>> END IF;
>>
>> Until here everyting is fine ... but now I try to query the value from
>> RECORD fieldvalues with the columname fieldname variable from the inner
>> loop !
>> I tryed the following ...
>>
>> query_value := 'select quote_ident(' || fieldvalues || ').quote_literal('
>> || fieldname ||')';
>>
>> EXECUTE query_value;
>>
>>
>> and I get the following error message ...
>>
>> ERROR: could not find arr
