关于TblobField的一个问题(50分)

TblobField的create方法中参数的具体用法和含义。<br>如下；希望高手给以说明下面语句的功能。<br>var &nbsp; <br>&nbsp; &nbsp; &nbsp; T: &nbsp; TBlobField; &nbsp; <br>&nbsp; begin &nbsp; <br>&nbsp; &nbsp; &nbsp; SQLDataSet1.Close; &nbsp; <br>&nbsp; &nbsp; &nbsp; T &nbsp; := &nbsp; TBlobField.Create(SQLDataSet1); &nbsp; <br>&nbsp; &nbsp; &nbsp; T.FieldName &nbsp; := &nbsp; 'Images'; &nbsp; <br>&nbsp; &nbsp; &nbsp; T.Name &nbsp; := &nbsp; SQLDataSet1.Name &nbsp; + &nbsp; T.FieldName; &nbsp; <br>&nbsp; &nbsp; &nbsp; T.Index &nbsp; := &nbsp; SQLDataSet1.FieldCount; &nbsp; <br>&nbsp; &nbsp; &nbsp; T.DataSet &nbsp; := &nbsp; SQLDataSet1; &nbsp; <br>&nbsp; &nbsp; &nbsp; SQLDataSet1.FieldDefs.UpDate; &nbsp; <br>&nbsp; &nbsp; &nbsp; SQLDataSet1.Open; &nbsp; <br>&nbsp; end;