请教DAOQuerye的Opentype属性(50分)

用DiamondAccess控件访问Access数据库时,
DAOQuerye的Opentype属性

property OpenType: TDAOQueryOpenType;
TDAOQueryOpenType = (db_OpenDynaset,
db_OpenSnapshot, db_OpenForwardOnly,
db_OpenDynamic);

各枚举值的含义是什么？我一直用其默认值。
我以前用VB时还懂点，现在VB书送人了，且
我的电脑又没装VB，有谁给我讲讲，让我回忆
回忆。

dbOpenDynamic Opens a dynamic-type Recordset object, which is similar to an ODBC dynamic cursor. (ODBCDirect workspaces only)
dbOpenDynaset Opens a dynaset-type Recordset object, which is similar to an ODBC keyset cursor.
dbOpenSnapshot Opens a snapshot-type Recordset object, which is similar to an ODBC static cursor.
dbOpenForwardOnly?Opens a forward-only-type Recordset object.

详细资料自己查阅一下Access 的帮助

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多人接受答案了。