I am using DELPHI three-tier architecture, one of the CLIENTATASET TEXT types (used to) fields, there is value, when I want to remove this value, FLD. The CLEAR/FLD ASTRING='/FLD.VALUE=https://bbs.csdn.net/topics/NULL all not line, if the client did not submit the field modification, if can submit fu Spaces and other values, mystery, forget to teach it