How to access parameters inside a Netezza stored procedure?

Question

This is my stored procedure:

nzsql -u user -pw pass -c "CREATE OR REPLACE PROCEDURE INSERT_LOGIC(varchar(50),varchar(20),varchar(40)) RETURNS BOOL LANGUAGE NZPLSQL AS BEGIN_PROC
DECLARE
t1 ALIAS FOR $1;
t2 ALIAS FOR $2;
t3 ALIAS FOR $3;
BEGIN

INSERT INTO ABC..XYZ
(select '$t1','$t2','$t3' from ABC..PQR limit 10);

END;
END_PROC;"

The ALIAS FOR is the only way I found on the internet to do this but I get the following error:

NOTICE:  plpgsql: ERROR during compile of INSERT_LOGIC near line 3
ERROR:  syntax error, unexpected ERROR, expecting VARIABLE or WORD at or near "t1Stuff"

How do I access the three "varchar variables" that I pass to the stored procedure inside the same?

Answer 1

You're attempting to reference variables by putting a $ in front of the name, which is not valid.

Look at the example in the docs.

DECLARE
  logtxt ALIAS FOR $1;
  curtime timestamp;
BEGIN
  curtime := 'now()';
  INSERT INTO logtable VALUES (logtxt, curtime);
  RETURN curtime;
END

You should try

INSERT INTO ABC..XYZ
(select t1, t2, t3 from ABC..PQR limit 10);

Though it's possible that the column values won't resolve when used this way. If not, build a dynamic statement and execute it instead.

declare sql varchar;
sql := 'insert into abc..xyz select ' || t1 || ',' || t2 || ',' || t3 || ' from abc..pqr limit 10;'
execute immediate sql;

If you're passing values, not column names, as parameters:

declare sql varchar;
sql := 'insert into abc..xyz select ''' || t1 || ''',''' || t2 || ''',''' || t3 || ''' from abc..pqr limit 10;'
execute immediate sql;

Answer 2

Here is an example similar to your requirement and its working. I am using two tables 'tab1' and 'tab2' with following description:

    $ nzsql -d test -c "\d tab1"
                         Table "TAB1"
     Attribute |     Type      | Modifier | Default Value
    -----------+---------------+----------+---------------
     COL1      | INTEGER       |          |
     COL2      | CHARACTER(10) |          |
     COL3      | INTEGER       |          |
    Distributed on hash: "COL1"

    $ nzsql -d test -c "\d tab2"
                         Table "TAB2"
     Attribute |     Type      | Modifier | Default Value
    -----------+---------------+----------+---------------
     C1        | INTEGER       |          |
     C2        | CHARACTER(10) |          |
     C3        | INTEGER       |          |
    Distributed on hash: "C1"

Following is the stored procedure code that I used:

    CREATE OR REPLACE PROCEDURE INSERT_LOGIC(varchar(50),varchar(20),varchar(40))
       RETURNS BOOL
       LANGUAGE NZPLSQL
       AS
    BEGIN_PROC
      DECLARE
        num_args int4;
        sql char(100);
        t1 ALIAS FOR $1;
        t2 ALIAS FOR $2;
        t3 ALIAS FOR $3;
      BEGIN
        num_args := PROC_ARGUMENT_TYPES.count;
        RAISE NOTICE 'Number of arguments: %', num_args;
        sql := 'INSERT INTO tab2 SELECT ' || t1 || ',' || t2 || ',' || t3 || ' FROM tab1 LIMIT 10 ';
        RAISE NOTICE 'SQL Statement: %', sql;
        EXECUTE IMMEDIATE sql;
      END;
    END_PROC;

Hope this will help!