I have a loop.  For each record I perform two checks.
For each error I want to write a record in an error table.  If two checks
fail, I want to write two records.

Code in the loop: mystring = "......"
                 db.execute (mystring)
                 mystring = "......"
                 db.execute (mystring)

If there are two errors, only the first record will be added.  If I
"comment" the first record, then the second will be written so it is not a
problem of the sql statement.

Any suggestions?