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我在 C# 中自动生成数字。这个样本像这样PPP-150500001，PPP-150500002 => PPP-是一个永远不会改变的字符串，15是年份，05是日期，00001是自动生成的数字。像PPP-160100001这样的新年后如何重置自动编号。

这是我的方法：

public void NomerUrut()
    {
        long hitung;
        string urut;
        OracleCommand cmd = new OracleCommand();
        OracleDataReader dr;
        cmd.CommandText = @"SELECT NOPERMOHONAN FROM PERMOHONAN WHERE NOPERMOHONAN IN (SELECT MAX(NOPERMOHONAN) 
                            FROM PERMOHONAN) ORDER BY NOPERMOHONAN DESC";
        cmd.Connection = koneksi_manual.con;
        koneksi_manual.con.Open(); //open connection
        dr = cmd.ExecuteReader();
        dr.Read();
        if (dr.HasRows)
        {
            hitung = Convert.ToInt64(dr[0].ToString().Substring(dr["NOPERMOHONAN"].ToString().Length - 5, 5)) + 1;
            string joinstr = "00000" + hitung;
            DateTime dt = DateTime.Now; // take years and date in autonumber
            urut = "PPP-" + dt.ToString("yy") + dt.ToString("MM") + joinstr.Substring(joinstr.Length - 5, 5); 
            //it will show PPP-150500002, PPP-150500003, etc
            //how can i reset this autonumber after get new years like PPP-160100001
        }
        else
        {
            urut = "PPP-150500001"; // first form load will display this default autonumber
        }
        dr.Close();
        txtNoPermohonan.Text = urut; //display auto generate number in a textbox
        koneksi_manual.con.Close(); //close connection
    }

解决了。

我有这个问题的更新，我可以使用另一个查询来完成它来解决我的问题。我可以每年重置它..这是我的更新代码：

public static string GenerateKodeUrut()
    {
        string nomor = "";
        string date = DateTime.Now.ToString("yyyy/MM/dd").Substring(2, 2);
        DateTime dt = DateTime.Now;

        OracleCommand cmd = new OracleCommand();
        OracleDataReader dr;
        cmd.CommandText = (@"SELECT NOPERMOHONAN from PERMOHONAN 
                             where substr(NOPERMOHONAN, 5,2) ='" + date + "' ORDER BY cast(substr(NOPERMOHONAN, 9,5) as number) DESC");
        cmd.Connection = koneksi_manual.con;
        dr = cmd.ExecuteReader();
        dr.Read();
        if (dr.HasRows)
        {
            string nmrTerakhir = (dr["NOPERMOHONAN"]).ToString().Remove(0, 8);
            nomor = "PPP-" + date + dt.ToString("MM") + (Convert.ToInt32(nmrTerakhir) + 1).ToString("0000#");
        }
        else
        {
            nomor = "PPP-" + date + dt.ToString("MM") + "00001";
        }
        return nomor;
    }
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1 回答 1

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你可以在你的数据库中做一个标记来检查它&&你的日期。

我希望代码能给你我的想法

        bool flage = false;
        int checkdate = Convert.ToInt16(dt.ToString("MM"));
        if (checkdate == 12) {
            flage = true;
        }
        if (flage == true && checkdate == 1) { 
        //Write Your Code Here 
            flage = false;
        }
于 2015-05-22T02:03:06.153 回答