无效的列名sql错误

本文关键字：sql 错误 无效 | 更新日期: 2023-09-27 18:16:47

我试图输入数据到我的数据库，但它给了我以下错误:

无效的列名

这是我的代码

string connectionString = "Persist Security Info=False;User ID=sa;Password=123;Initial Catalog=AddressBook;Server=Bilal-PC";
using (SqlConnection connection = new SqlConnection(connectionString))
{
  SqlCommand cmd = new SqlCommand();
  cmd.CommandText = "INSERT INTO Data (Name,PhoneNo,Address) VALUES (" + txtName.Text + "," + txtPhone.Text + "," + txtAddress.Text + ");";
  cmd.CommandType = CommandType.Text;
  cmd.Connection = connection;
  connection.Open();
  cmd.ExecuteNonQuery();
}

无效的列名sql错误

您可能需要在这些字符串字段周围加上引号，但是，您应该使用参数化查询!

cmd.CommandText = "INSERT INTO Data ([Name],PhoneNo,Address) VALUES (@name, @phone, @address)";
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue("@name", txtName.Text);
cmd.Parameters.AddWithValue("@phone", txtPhone.Text);
cmd.Parameters.AddWithValue("@address", txtAddress.Text);
cmd.Connection = connection;

顺便说一下，你的原始查询可以像这样修复(注意单引号):

"VALUES ('" + txtName.Text + "','" + txtPhone.Text + "','" + txtAddress.Text + "');";

，但这会使它容易受到SQL注入攻击，因为用户可以输入

'; drop table users; --

插入到文本框中。或者，更普通的是，可怜的Daniel O'Reilly每次都会打断你的查询。

始终尝试使用参数化sql查询以防止恶意事件发生，因此您可以按照以下方式重新排列代码:

还要确保表的列名与Name, PhoneNo, Address匹配。

using (SqlConnection connection = new SqlConnection(connectionString))
{
    SqlCommand cmd = new SqlCommand("INSERT INTO Data (Name, PhoneNo, Address) VALUES (@Name, @PhoneNo, @Address)");
    cmd.CommandType = CommandType.Text;
    cmd.Connection = connection;
    cmd.Parameters.AddWithValue("@Name", txtName.Text);
    cmd.Parameters.AddWithValue("@PhoneNo", txtPhone.Text);
    cmd.Parameters.AddWithValue("@Address", txtAddress.Text);
    connection.Open();
    cmd.ExecuteNonQuery();
}

改变这一行:

cmd.CommandText = "INSERT INTO Data (Name,PhoneNo,Address) VALUES (" + txtName.Text + "," + txtPhone.Text + "," + txtAddress.Text + ");";

: 

cmd.CommandText = "INSERT INTO Data (Name,PhoneNo,Address) VALUES ('" + txtName.Text + "','" + txtPhone.Text + "','" + txtAddress.Text + "');";

您的插入命令需要文本，并且您需要在实际值之间使用单引号(')，以便SQL可以将其理解为文本。

EDIT:对于那些对这个答案不满意的人，我想指出这段代码在SQL注入方面存在问题。当我回答这个问题时，我只考虑了他代码中缺少单引号的问题，并指出了如何修复它。Adam发表了一个更好的答案(我投了票)，他解释了注射的问题，并展示了一种预防的方法。现在放轻松，开心点。

你的问题是你的字符串没有引号。这意味着它们被数据库引擎解释为列名。

您需要创建参数以便将您的值传递给查询。

 cmd.CommandText = "INSERT INTO Data (Name, PhoneNo, Address) VALUES (@Name, @PhoneNo, @Address);";
 cmd.Parameters.AddWithValue("@Name", txtName.Text);
 cmd.Parameters.AddWithValue("@PhoneNo", txtPhone.Text);
 cmd.Parameters.AddWithValue("@Address", txtAddress.Text);

你永远不应该编写将SQL和参数连接为字符串的代码-这会使你的代码容易被SQL注入，这是一个非常严重的安全问题。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Data.SqlClient;
using System.Data;
namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        private void btnAdd_Click(object sender, RoutedEventArgs e)
        {
            SqlConnection conn = new SqlConnection(@"Data Source=WKS09'SQLEXPRESS;Initial Catalog = StudentManagementSystem;Integrated Security=True");
            SqlCommand insert = new SqlCommand("insert into dbo.StudentRegistration(ID, Name,Age,DateOfBirth,Email,Comment) values(@ID, @Name,@Age,@DateOfBirth,@mail,@comment)", conn);
            insert.Parameters.AddWithValue("@ID", textBox1.Text);
            insert.Parameters.AddWithValue("@Name", textBox2.Text);
            insert.Parameters.AddWithValue("@Age", textBox3.Text);
            insert.Parameters.AddWithValue("@DateOfBirth", textBox4.Text);
            insert.Parameters.AddWithValue("@mail", textBox5.Text);
            insert.Parameters.AddWithValue("@comment", textBox6.Text);
            if (textBox1.Text == string.Empty)
            {
                MessageBox.Show("ID Cannot be Null");
                return;
            }
            else if (textBox2.Text == string.Empty)
            {
                MessageBox.Show("Name Cannot be Null");
                return;
            }

            try
            {
                conn.Open();
                insert.ExecuteNonQuery();
                MessageBox.Show("Register done !");
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error" + ex.Message);
                conn.Close();
            }
        }
        private void btnRetrive_Click(object sender, RoutedEventArgs e)
        {
            bool temp = false;
            SqlConnection con = new SqlConnection("server=WKS09''SQLEXPRESS;database=StudentManagementSystem;Trusted_Connection=True");
            con.Open();
            SqlCommand cmd = new SqlCommand("select * from dbo.StudentRegistration where ID = '" + textBox1.Text.Trim() + "'", con);
            SqlDataReader dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                textBox2.Text = dr.GetString(1);
                textBox3.Text = dr.GetInt32(2).ToString(); 
                textBox4.Text = dr.GetDateTime(3).ToString();
                textBox5.Text = dr.GetString(4);
                textBox6.Text = dr.GetString(5);
                temp = true;
            }
            if (temp == false)
                MessageBox.Show("not found");
            con.Close();
        }
        private void btnClear_Click(object sender, RoutedEventArgs e)
        {
            SqlConnection connection = new SqlConnection("Data Source=WKS09''SQLEXPRESS;Initial Catalog = StudentManagementSystem;Integrated Security=True");
            string sqlStatement = "DELETE FROM dbo.StudentRegistration WHERE ID = @ID";
            try
            {
                connection.Open();
                SqlCommand cmd = new SqlCommand(sqlStatement, connection);
                cmd.Parameters.AddWithValue("@ID", textBox1.Text);
                cmd.CommandType = CommandType.Text;
                cmd.ExecuteNonQuery();
                MessageBox.Show("Done");
            }
            finally
            {
                Clear();
                connection.Close();
            }
        }
        public void Clear()
        {
            textBox1.Text = "";
            textBox2.Text = "";
            textBox3.Text = "";
            textBox4.Text = "";
        }
    }
}

使用c#在Access Db中插入数据的代码

代码:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace access_db_csharp
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }
   public SqlConnection con = new SqlConnection(@"Place Your connection string");
            
           private void Savebutton_Click(object sender, EventArgs e)
    {
         SqlCommand cmd = new SqlCommand("insert into  Data (Name,PhoneNo,Address) values(@parameter1,@parameter2,@parameter3)",con);
                cmd.Parameters.AddWithValue("@parameter1", (textBox1.Text));
                cmd.Parameters.AddWithValue("@parameter2", textBox2.Text);
                cmd.Parameters.AddWithValue("@parameter3", (textBox4.Text));
                cmd.ExecuteNonQuery();
                }
    private void Form1_Load(object sender, EventArgs e)
    {
        con.ConnectionString = connectionstring;
        con.Open();
    }
}
}

您必须使用'"+texbox1.Text+"','"+texbox2.Text+"','"+texbox3.Text+"'

代替"+texbox1.Text+","+texbox2.Text+","+texbox3.Text+"

您的问题似乎是Name关键字。而不是使用FullName或firstName和lastName，总是尝试并记住使用CamelCase。

首先创建数据库名称"School"然后用以下列创建表"students"1. id2. 名字3.地址

打开visual studio并创建连接:

<>以前学校名称空间｛公共部分类Form1: Form｛SqlConnection scon;公共Form1 ()｛InitializeComponent ();scon = new SqlConnection("Data Source = ABC-PC;Trusted_connection = yes;数据库=学校;连接超时= 30");}//创建命令SqlCommand scom = new SqlCommand("insert into student (id,name,address) values(@id，@name，@address)"， scon);//传递参数scom.Parameters。添加("id",SqlDbType.Int);scom.Parameters (" id ")。Value = textBox1.Text;scom.Parameters。添加("名字",SqlDbType.VarChar);scom.Parameters("名字")。Value = this.textBox2.Text;scom.Parameters。Add("地址",SqlDbType.VarChar);scom.Parameters("地址")。Value = this.textBox6.Text;scon.Open ();scom.ExecuteNonQuery ();scon.Close ();重置();} 之前

也可以在这里查看解决方案:http://solutions.musanitech.com/?p=6

con = new SqlConnection(@"Data Source=.'SQLEXPRESS;AttachDbFilename=C:'Users'Yna Maningding-Dula'Documents'Visual Studio 2010'Projects'LuxuryHotel'LuxuryHotel'ClientsRecords.mdf;Integrated Security=True;User Instance=True");
        con.Open();
        cmd = new SqlCommand("INSERT INTO ClientData ([Last Name], [First Name], [Middle Name], Address, [Email Address], [Contact Number], Nationality, [Arrival Date], [Check-out Date], [Room Type], [Daily Rate], [No of Guests], [No of Rooms]) VALUES (@[Last Name], @[First Name], @[Middle Name], @Address, @[Email Address], @[Contact Number], @Nationality, @[Arrival Date], @[Check-out Date], @[Room Type], @[Daily Rate], @[No of Guests], @[No of Rooms]", con);
        cmd.Parameters.Add("@[Last Name]", txtLName.Text);
        cmd.Parameters.Add("@[First Name]", txtFName.Text);
        cmd.Parameters.Add("@[Middle Name]", txtMName.Text);
        cmd.Parameters.Add("@Address", txtAdd.Text);
        cmd.Parameters.Add("@[Email Address]", txtEmail.Text);
        cmd.Parameters.Add("@[Contact Number]", txtNumber.Text);
        cmd.Parameters.Add("@Nationality", txtNational.Text);
        cmd.Parameters.Add("@[Arrival Date]", txtArrive.Text);
        cmd.Parameters.Add("@[Check-out Date]", txtOut.Text);
        cmd.Parameters.Add("@[Room Type]", txtType.Text);
        cmd.Parameters.Add("@[Daily Rate]", txtRate.Text);
        cmd.Parameters.Add("@[No of Guests]", txtGuest.Text);
        cmd.Parameters.Add("@[No of Rooms]", txtRoom.Text);
        cmd.ExecuteNonQuery();
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