无法使用ASP.NET插入数据库中

Question

我想使用ASP.NET插入数据库中的记录，但它并不是很好。我的数据库中的colums的数据类型都是varchars，除了rantyid。但是我仍然会遇到这个错误：

system.data.sqlclient.sqlexception：'插入文本附近的不正确语法在这里'。'

这是我的代码

public partial class Registratie : System.Web.UI.Page
{
    SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)MSSQLLocalDB;AttachDbFilename=C:UsersDaneshDesktopWorkshopApp_DataStap1.mdf;Integrated Security=True");
    int RandomID = 2;
    String Notification = "Uw Identificatienummer is: ";
    protected void Page_Load(object sender, EventArgs e)
    {
        Random rnd = new Random();
        RandomID = rnd.Next(1, 10000000);
    }
    protected void BtnStap1_Click(object sender, EventArgs e)
    {    
        con.Open();
        SqlCommand cmd = con.CreateCommand();
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = " insert into Gebruiker values('" + RandomID + "', '" + Voornaamtxt.Text + "', '" + Tussenvoegseltxt.Text + "', '" + Achternaamtxt.Text + "','" + Emailtxt.Text + "' '" + Niveautxt.Text + "' )";
        cmd.ExecuteNonQuery();
        con.Close();
        MessageBox.Show(RandomID.ToString(), Notification);
        Response.Redirect("/Webpages/LoginPage.aspx");
    }    
}  

Answer 1

就像评论所说的那样，您应该参数查询以避免SQL注入，并且在一个字符串中输入的字符串包含一个特殊字符(逃脱字符或Quote(。/p>

protected void BtnStap1_Click(object sender, EventArgs e)
{
    con.Open();
    SqlCommand cmd = con.CreateCommand();
    cmd.CommandType = CommandType.Text;
    var paramsList = new SqlParameter[]
    {
        new SqlParameter("@p1", RandomID),
        new SqlParameter("@p2", Voornaamtxt.Text),
        new SqlParameter("@p3", Tussenvoegseltxt.Text),
        new SqlParameter("@p4", Achternaamtxt.Text),
        new SqlParameter("@p5", string.Join(" ",Emailtxt.Text,Niveautxt.Text),
    };
    cmd.CommandText = "insert into Gebruiker values(@p1, @p2, @p3, @p4, @p5)";
    cmd.Parameters.AddRange(paramsList);
    cmd.ExecuteNonQuery();
    con.Close();
    MessageBox.Show(RandomID.ToString(), Notification);
    Response.Redirect("/Webpages/LoginPage.aspx");
}

Answer 2

您在插入查询中错过了逗号(，(。

您的代码，

 cmd.CommandText = " insert into Gebruiker values('" + RandomID + "', '" + Voornaamtxt.Text + "', '" + Tussenvoegseltxt.Text + "', '" + Achternaamtxt.Text + "','" + Emailtxt.Text + "'(here) '" + Niveautxt.Text + "' )";

所以尝试一下，

cmd.CommandText = " insert into Gebruiker values('" + RandomID + "', '" + Voornaamtxt.Text + "', '" + Tussenvoegseltxt.Text + "', '" + Achternaamtxt.Text + "','" + Emailtxt.Text + "','" + Niveautxt.Text + "' )";