Make sure you try the same query in SQLPlus to see if it is an Oracle issue. I know that a query with a LONG column will cause what you are seeing when using an Oracle 9 client and an 8.1 server where the character set is unicode.
The Error Message is:
"Project raised exception class EAccessViolation with message 'Access violation at address 60536CB5 in module 'oracommon9.dll',Read of address 00000000'.Process stopped,"
NO.I didn't use the Demo projects.I used the project of myself.
I am sure that the project I am using is OK.
I guess something wrongs with the DOA control.