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string strDele = @"UPDATE one set nr='" + str1 + "' Where name='123'";
OleDbCommand myCommand = new OleDbCommand(strDele, myConn);
myCommand.ExecuteNonQuery();

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str2 ×ÖÊýΪ 63k
str3 ×ÖÊýΪ 63k
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string strDele = @"UPDATE one set nr='" + str2 + str3+"' Where name='123'";
OleDbCommand myCommand = new OleDbCommand(strDele, myConn);
myCommand.ExecuteNonQuery();
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string strDele = @"UPDATE one set nr='" + str2 + str3+str4+"' Where name='123'";
string strDele = @"UPDATE one set nr='" + str2 + str3+str4+str5+"' Where name='123'";

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ʹÓÃOLE  ObjectÀàÐÍ
http://topic.csdn.net/u/20070712/12/902691c7-46e7-4d41-ad8d-b4834bb476ec.html

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str2 ×ÖÊýΪ 63k
str3 ×ÖÊýΪ 63k
(str2 str3 ....ÊÇ´Óstr1½ØÈ¡µÄ)
string strDele = @"UPDATE one set nr=