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'== 标记数据库是否连接 ==
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Private IsConnect As Boolean
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'== 标记执行Connect()函数后,访问数据库的次数 ==
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Private Connect_Num As Integer
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Private cnn As ADODB.Connection '连接数据库的Connection对象
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Private rs As ADODB.Recordset '保存结果集的Recordset对象
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'连接数据库
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