The application is using the MSDAORA ODBC driver and I'm thinking that the driver is adding the terminating NULL character to its string buffer which may have a internal limit of 2000 characters.
该应用程序正在使用MSDAORA OD BC驱动程序，我想，驾驶员将终止空字符到字符串缓冲区其中的可能的有2000个字符的内部限制。