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

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 ;  EXECUTE query_value;  RETURN cm_tableName;END;
$$ language 'plpgsql' IMMUTABLE STRICT;

select test('001');
Error:
ERROR:  syntax error at or near "$1" at character 20
QUERY:  SELECT  col2 FROM  $1  WHERE col1 =  $2
CONTEXT:  PL/pgSQL function "test" line 8 at select into variables
LINE 1: SELECT  col2 FROM  $1  WHERE col1 =  $2

Does it mean I have to use the cursor ?

Thanks,
Ying


>I think it is SELECT INTO cm_tableName col2 FROM ... WHERE ...
>
>2006/3/17, Emi Lu <emilu@encs.concordia.ca>:
>  
>
>>Hello,
>>
>>In pl/pgsql (postgresql 8.01), how to use variables in select .. into ..
>>command
>>
>>CREATE OR REPLACE FUNCTION test(VARCHAR) RETURNS VARCHAR AS $$
>>DECLARE
>>   var1                           ALIAS FOR $1;
>>   cm_tableName           tableA.col1%TYPE;
>>   T1                              VARCHAR := 'sourceTable';
>>   query_value               VARCHAR ;
>>BEGIN
>>
>>   SELECT col2 INTO cm_tableName FROM  T1  WHERE col1 = var1 ;
>>   EXECUTE query_value;
>>
>>
>>   RETURN cm_tableName;
>> END;
>>$$ language 'plpgsql' IMMUTABLE STRICT;
>>
>>select test('abc');
>>
>>Failed.
>>
>>
>>Also, tried "SELECT col2 INTO cm_tableName FROM ||  T1  WHERE col1 =  ||
>>var1 " and
>>"SELECT col2 INTO cm_tableName FROM ||  T1 ||  WHERE col1 =  || var1"
>>
>>Failed as well.
>>
>>T1 and var1 both are variables, may I how to use variables in a "select
>>... into " query please?
>>
>>Thanks a lot,
>>Ying
>>
>>
>>
>>
>>
>>---------------------------(end of broadcast)---------------------------
>>TIP 6: explain analyze is your friend
>>
>>    
>>