Re: partitioning and dynamic query creation

Try:
execute ... using new.*

2011/2/10, Gerd Koenig <koenig(at)transporeon(dot)com>:
> Hello list,
>
> I'm currently thinking about a possibility to create a dynamic insert
> statement inside a trigger function to put the data in the correct
> partition.
> What am I talking about ?
> I want to put data dependant on a timestamp column ("datetime") in seperate
> partitions. Therefore I created the partitions, checks and a trigger
> function
> with the following code:
> ""
> ...
> date_part='';
> date_part = to_char(NEW.datetime,'YYYY') || to_char(NEW.datetime,'MM');
> tablename = 'table_' || date_part;
> RAISE NOTICE 'target table: %', tablename;
> EXECUTE 'insert into ' || tablename::regclass || ' values (NEW.*);';
> --IF ( DATE (NEW.datetime) >= DATE '2010-11-01' AND
> -- DATE (NEW.datetime) < DATE '2010-12-01' ) THEN
> -- INSERT INTO tab_tour201011 VALUES (NEW.*);
> --ELSIF ( DATE (NEW.datetime) >= DATE '2010-12-01' AND
> -- DATE (NEW.datetime) < DATE '2011-01-01' ) THEN
> -- INSERT INTO tab_tour201012 VALUES (NEW.*);
> --ELSIF ( DATE (NEW.datetime) >= DATE '2011-01-01' AND
> -- DATE (NEW.datetime) < DATE '2011-02-01' ) THEN
> -- INSERT INTO tab_tour201101 VALUES (NEW.*);
> --ELSIF ( DATE (NEW.datetime) >= DATE '2011-02-01' AND
> -- DATE (NEW.datetime) < DATE '2011-03-01' ) THEN
> -- INSERT INTO tab_tour201102 VALUES (NEW.*);
> ...
> ""
>
> The above code throws the following error while trying to insert data:
> ""
> NOTICE: target table: table_201102
> ERROR: missing FROM-clause entry for table "new"
> LINE 1: insert into table_201102 values (NEW.*);
> ^
> QUERY: insert into table_201102 values (NEW.*);
> CONTEXT: PL/pgSQL function "insert_trigger" line 10 at EXECUTE statement
> ""
>
> O.K., most probably this is caused by the fact that the statement "string"
> includes the characters NEW, but not the values...or what....?!?!
> The commented lines are working as expected and I think this is the common
> way
> of handling partitions.
>
> Now my question:
> is it possible at all to create the insert statement on the fly, to avoid
> modifying the trigger function each time a new partition has been added ?
>
> any help appreciated....::GERD::....
>
> --
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--
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pasman