Question

我正在制作一个表单来为我的登录应用程序添加帐户如果你可以提供帮助那就太棒了。

我只有11岁，所以这可能是一个愚蠢的问题！

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.OleDb;

namespace Login_Viper_Safe
{
    public partial class Form3 : Form
    {
        private OleDbConnection connection = new OleDbConnection();
        public Form3()
        {
            InitializeComponent();
            connection.ConnectionString =   @"Provider=Microsoft.ACE.OLEDB.12.0; Data Source=C:\Users\SillyTen9\Documents\UserDatabase.accdb; Persist Security Info=False;";
    }

    private void Form3_Load(object sender, EventArgs e)
    {

    }

    private void button1_Click(object sender, EventArgs e)
    {
        try
        {
            connection.Open();
            OleDbCommand command = new OleDbCommand();
            command.Connection = connection;
            command.CommandText = "INSERT INTO UserDatabase ([Username], [Password], FirstName, LastName) VALUSES('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "')";
            command.ExecuteNonQuery();
            MessageBox.Show("Signed Up!");
        }
        catch (Exception ex)
        {
            MessageBox.Show("Error " + ex);
        }
    }
}

Answer 1

你的值有误（额外的s）：

 "INSERT INTO UserDatabase ([Username], [Password], FirstName, LastName) VALUES( ...

使用参数也很重要：

command.CommandText = "INSERT INTO UserDatabase ([Username], [Password], FirstName, LastName) VALUES (@param1,@param2,@param3,@param4)";
command.Parameters.AddWithValue("@param1",textBox1.Text);
command.Parameters.AddWithValue("@param2",textBox2.Text);
command.Parameters.AddWithValue("@param3",textBox3.Text);
command.Parameters.AddWithValue("@param4",textBox4.Text);
...

Answer 2

您在输入查询

中将拼写错误设为值而不是VALUSES

command.CommandText = "INSERT INTO UserDatabase ([Username], [Password], FirstName, LastName) VALUES('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "')";

语法错误 - INSERT INTO语句

2 个答案: