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string connectionString = ConfigurationManager.AppSettings["ConnectionString"];
        string sql = "insert into times(time) values('" + DateTime.Now + "' )";
        OleDbConnection con = new OleDbConnection(connectionString);
        OleDbCommand cmd = new OleDbCommand(sql, con);
        con.Open();
        cmd.ExecuteNonQuery();
        con.Close();

±¨´í string sql = "insert into times(time) values('" + DateTime.Now + "' )";
ÓдíÎ󣬵«ÊÇÎÒÔÚACCESSÊý¾Ý¿âÀïÃæ¾ÍûÎÊÌâ

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string sql = "insert into times(time) values('" + DateTime.Now + "' )";

³ÌÐòÀïÃæµÄ¸ñʽÓëÊý¾Ý¿âÀïµÄ¸ñʽÊDz»ÏàͬµÄ,ҪתÏÂ,

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string sql = "insert into times([time]) values(#" + DateTime.Now + "# )";
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values('" + DateTime.Now + "' )";

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string sql = "insert into times([time]) values(#" + DateTime.Now + "# )";