INSERT语句不会将数据插入表中

Question

我的INSERT陈述有问题.我从gridviev获取数据并且工作正常,但我无法将它们插入表中

private void button3_Click(object sender, EventArgs e)
{
    int amorplanid = 0;
    int idn = 0;
    DateTime datum;
    double interest = 0;
    double principal = 0;
    double payment = 0;
    double newprincipal = 0;

    string nizz = "";
    string[] niz= new string[7];
    for (int x = 0; x < dataGridView1.Rows.Count-1; x++)
    {
        for (int j = 0; j < dataGridView1.Rows[x].Cells.Count; j++)
        {
            nizz += dataGridView1.Rows[x].Cells[j].Value.ToString()+"."; 
        }
        niz = nizz.Split('.');

        amorplanid = System.Convert.ToInt32(niz[0]);
        idn = System.Convert.ToInt32(niz[1]);
        // datum = System.Convert.ToDateTime(niz[2]);
        datum = DateTime.Now;
        interest = System.Convert.ToDouble(niz[3]);
        principal = System.Convert.ToDouble(niz[4]);
        payment = System.Convert.ToDouble(niz[5]);
        newprincipal = System.Convert.ToDouble(niz[6]);

        String insert = @"INSERT INTO AmortPlanCoupT(ID, AmortPlanID, CoupDate, Interest, Principal, Payxment, NewPrincipal) VALUES (" + idn + "," + amorplanid + "," + datum + "," + (float)interest + "," + (float)principal + "," + (float)payment + "," + (float)newprincipal + ")";
        SqlConnection myconn = new SqlConnection(conn);
        // String MyString = @"INSERT INTO Employee(ID, FirstName, LastName) VALUES(2, 'G', 'M')";
        try
        {
            myconn.Open();
            SqlCommand cmd = new SqlCommand(insert, myconn);
            cmd.ExecuteNonQuery();
            myconn.Close();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
    }

    label14.Text = niz[0];
}

我创建了一个Windows控制台应用程序来测试:

我有test两列的表id (int) , leto (float);

SqlConnection MyConnection = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\App_Data\Database1.mdf;Integrated Security=True;User Instance=True");

try
{
    MyConnection.Open();

    String MyString = @"INSERT INTO test(id, leto) VALUES(2, 2)";
    SqlCommand MyCmd = new SqlCommand(MyString, MyConnection);

    MyCmd.ExecuteScalar();
    MyConnection.Close();
}
catch (Exception e)
{
    Console.WriteLine(e.ToString());
}

我一直在尝试不同的东西来将数据写入表格,而且无法将它们存储到那里.

Answer 1

正如我之前在这个网站上所说的那样 - 整个用户实例和AttachDbFileName =方法都存在缺陷 - 充其量!Visual Studio将在.mdf文件周围复制,很可能,你的INSERT工作很好 - 但你最后只是查看错误的.mdf文件!

如果你想坚持这种方法,那么尝试在myConnection.Close()调用上设置一个断点- 然后.mdf用SQL Server Mgmt Studio Express 检查文件 - 我几乎可以肯定你的数据就在那里.

在真正的解决办法在我看来,将

1. 安装SQL Server Express(你已经完成了)

2. 安装SQL Server Management Studio Express

3. 在SSMS Express中创建数据库,给它一个逻辑名称(例如Database1)

4. 使用其逻辑数据库名称(在服务器上创建时给定)连接到它- 并且不要乱用物理数据库文件和用户实例.在这种情况下,您的连接字符串将类似于:

   Data Source=.\SQLEXPRESS;Database=Database1;Integrated Security=True
   

   其他一切都和以前完全一样......