Insert where the fieldname is in a variable.

Question

Hi,
I want to execute an insert query.
But the fieldname is stored in a variable.
The query looks like this:
insert into xx (var1, var2, var3) VALUES (insertvalue1,insertvalue2,insertvalue3)
Example:
1st time:
var1 = field1
var2 = field6
var3= null
2nd time:
var1= field3
var2= field2
var3= field11
Sometimes a fieldname-variable stay's empty. How can I make some code that can handle this?
Thanks in advance.
So this won't work

Answer 1

First off, I would seriously question why you're writing code where you don't know what columns you're working with. While there are certainly occasions where this may be appropriate, those should be extremely rare.
That said, you can use dynamic SQL to assemble the SQL statement, i.e.
DECLARE
  var1 VARCHAR2(30) := 'field1';
  var2 VARCHAR2(30) := 'field6';
  var3 VARCHAR2(30) := 'field11';
BEGIN
  EXECUTE IMMEDIATE
    'INSERT INTO my_table( ' || var1 || ', ' || var2 || ', ' || var3 || ' ) ' ||
      'VALUES( ?, ?, ? )'
    USING insertValue1, insertValue2, insertValue3
END;Of course, you'd need to add logic when assembling the SQL statement string to handle NULL values, which should be tedious but straightforward.
Justin