Código MySQL:
Ver original+----------------------+
| campo |
+----------------------+
| sdsada |
| sdsada:yi5345hk9] |
| sda:i56gdg7364fsdk9] |
+----------------------+
Query OK, 0 rows affected (0.00 sec)
Query OK, 2 rows affected (0.00 sec)
+--------+
| campo |
+--------+
| sdsada |
| |
| |
+--------+
Query OK, 0 rows affected (0.00 sec)
+----------------------+
| campo |
+----------------------+
| sdsada |
| sdsada:yi5345hk9] |
| sda:i56gdg7364fsdk9] |
+----------------------+
mysql>
según entendí, eso era lo que querías. Fijate que el rollback si funciona. tal vez lo utilizaste mal
saludos