Control flow functions of MySQL (like IF, CASE) change data type of LONGMEMO and LONGBLOB fields.
__Strings65535ToMemo: boolean = True;
Control flow functions of MySQL (like IF, CASE) change data type of LONGMEMO and LONGBLOB fields. It causes wrong description of these fields by MyDAC and truncating their data. To avoid these problems, MyDAC tries to restore the correct data type. This behaviour was introduced in MyDAC 5.10.0.9. To disable this behaviour, set the __Strings65535ToMemo variable to False.