procedure Close; //关闭一个数据集,数据集必须关闭当与其关联的数据源的属性改变时。
procedure Open; // 打开记录集
procedure First; // Moves to the first record in the dataset.
procedure Next; //Moves to the next record in the dataset.
function FieldByName(const FieldName: string): TField;//Finds a field based on its name.
property Eof: Boolean; //是否是记录集中的最后一条记录
property SQL: TStrings;//Contains the text of the SQL statement to execute for the ADO query.

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