Using string in Oracle stored procedure

Question

When I simply write a query in which it has code like

Select * from ..
where ...
AND    gfcid in ( select regexp_substr(\'1005771621,1001035181\'||\',\',\'\\d+\'         


        

Answer 1

As far as I understand your problem, you need a method to accept a comma-delimited string as an input, break it into a collection of integers and then compare a number (read: integer) with the values in this collection.

Oracle offers mainly three types of collections- varrays, nested tables and associative arrays. I would explain how to convert a comma-delimited string into a nested table and use it to query or compare.

First, you need to define an object type in the schema. You can write queries using this type only if you define it at schema level.

CREATE OR REPLACE TYPE entity_id AS OBJECT (id_val NUMBER(28));
/

CREATE OR REPLACE TYPE entity_id_set IS TABLE OF entity_id;
/

Next, define a function like this:

FUNCTION comma_to_nt_integer (p_comma_delimited_str IN VARCHAR)
    RETURN entity_id_set IS
    v_table     entity_id_set;
BEGIN
    WITH temp AS (SELECT TRIM(BOTH ',' FROM p_comma_delimited_str) AS str FROM DUAL)
        SELECT ENTITY_ID(TRIM (REGEXP_SUBSTR (t.str,
                                    '[^,]+',
                                    1,
                                    LEVEL)))
                   str
          BULK COLLECT INTO v_table
          FROM temp t
    CONNECT BY INSTR (str,
                      ',',
                      1,
                      LEVEL - 1) > 0;

    RETURN v_table;
END comma_to_nt_integer;

You are done with the DDL required for this task. Now, you can simply write your query as:

SELECT *
  FROM ..  
 WHERE ...
       AND gfcid in (table(comma_to_nt_integer(GDFCID_STRING)));