Question

I have a delimited string of values like such: 00,45,50,66,84,99. This string is passed as an IN parameter to a DB2 stored procedure. In the procedure, I would like to loop through this string and insert each value into a temp table. My knowledge of DB2 looping syntax is very poor and I have been struggling with this for awhile. Any help would be much appreciated, thank you!

Answer 1

You can define a recursive SP that takes the IN varchar, processes the first element, and do a recursive call for the rest.

CREATE OR REPLACE PROCEDURE REC (
 IN STRING VARCHAR(256)
)
P_REC: BEGIN
 DECLARE INDEX SMALLINT;
 DECLARE PRE VARCHAR(256);
 DECLARE POS VARCHAR(256);
 DECLARE STMT STATEMENT;
 PREPARE STMT FROM 'CALL REC(?)';

 SET INDEX = POSSTR (STRING, ',');
 IF (INDEX <> 0) THEN
  SET PRE = SUBSTR(STRING, 1, INDEX - 1);
  INSERT INTO table
    VALUES (PRE);
  -- Recursive call
  SET POS = SUBSTR(STRING, INDEX + 1);
  EXECUTE STMT USING POS;
 ELSE
  INSERT INTO table
    VALUES (STRING);
 END IF;
END P_REC @

To make it work from db2clp:

db2 create table table (string varchar(256))
db2 -td@
 <Copy, paste> in the interactive mode + quit
db2 call rec ('00,45,50,66,84,99')
db2 select * from table