请问：在delphi中如何判断字段的类型？

[dddlm]

请问：在delphi中如何判断某个字段的类型？
主要用来查询用的。

[firetoucher]

if adoquery1.FieldDefList.FieldDefs[i].DataType =ftString then//如果字段i是字符型

[技术的天空]

type TFieldType = (ftUnknown, ftString, ftSmallint, ftInteger, ftWord, ftBoolean, ftFloat, ftCurrency, ftBCD, ftDate, ftTime, ftDateTime, ftBytes, ftVarBytes, ftAutoInc, ftBlob, ftMemo, ftGraphic, ftFmtMemo, ftParadoxOle, ftDBaseOle, ftTypedBinary, ftCursor, ftFixedChar, ftWideString, ftLargeint, ftADT, ftArray, ftReference, ftDataSet, ftOraBlob, ftOraClob, ftVariant, ftInterface, ftIDispatch, ftGuid, ftTimeStamp, ftFMTBcd);