Re: in PlPgSQL function, how to use variable in a "select ...

am  17.03.2006, um 14:23:57 -0500 mailte Emi Lu folgendes:
> Does not work either, the whole function is:
> 
> create table t1(col1 varchar(3), col2 varchar(100));
> insert into t1 values('001', 'Result 1');
> insert into t1 values('002', 'Result 2');
> insert into t1 values('003', 'Result 3');
> 
> CREATE OR REPLACE FUNCTION test(VARCHAR) RETURNS VARCHAR AS $$
> DECLARE
>    col1_value                ALIAS FOR $1;                            
> cm_tableName           st1_legend.code_map_tablename%TYPE;   
> lengendTableName    VARCHAR := 't1';
>    query_value                VARCHAR ;
> BEGIN
> 
>    SELECT INTO cm_tableName col2 FROM lengendTableName WHERE col1 = 
> col1_value ;

This can't work, read the docu:
http://www.postgresql.org/docs/8.1/interactive/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN

You should build a string with your SQL and EXECUTE this string.


HTH, Andreas
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