我想在我的数据库中添加一些信息。我搜索了一些教程，但没有一个可以工作。
NonQuery可以做他需要做的事情，因为messagebox返回“Success”（1）。但它不会更新我的数据库。如果我将相同的查询添加到“添加新查询”，直接到我的数据库，它就可以工作。
有人可以帮助我吗？
我的班级代码：
namespace BurnThatFat
{
class databaseconnection
{
//fields
SqlConnection connection;
string connectionstring;
public databaseconnection()
{
// fields waarde toewijzen
connectionstring = @"Data Source=(LocalDB)\MSSQLLocalDB;" +
@"AttachDbFilename=|DataDirectory|\Database2.mdf;Integrated Security=True";
connection = new SqlConnection(connectionstring);
OpenConnection();
CloseConnection();
}
public List<Object> getObjectsFromDatabase()
{
try
{
OpenConnection();
// sql query
// Datareader
// sqlcommand
// return list van objecten , objecten veranderd naar jouw wens van data.
CloseConnection();
}
catch (Exception)
{
throw;
}
return new List<object>();
}
private bool OpenConnection()
{
try
{
connection.Open();
return true;
}
catch (MySqlException ex)
{
switch (ex.Number)
{
case 0:
MessageBox.Show("Cannot connect to server. Contact administrator");
break;
case 1045:
MessageBox.Show("Invalid username/password, please try again");
break;
}
return false;
}
}
private bool CloseConnection()
{
try
{
connection.Close();
return true;
}
catch (MySqlException ex)
{
MessageBox.Show(ex.Message);
return false;
}
}
public void AddGebruiker()
{
string query = "insert into Gebruiker VALUES(3, 'Cihan', 'Kurt', 18, 'Man', 85, 75, 'Admin1', 'Test123', 'testen');";
using (connection)
{
SqlCommand command = new SqlCommand(query, connection);
OpenConnection();
int resultaat = command.ExecuteNonQuery();
if (resultaat == 1)
{
MessageBox.Show("succes");
}
else
{
MessageBox.Show("fail");
}
}
}
}
}
编辑：
这是我按钮的代码等：
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;
// voor sql connectie.
using System.Data.SqlClient;
namespace BurnThatFat
{
public partial class SignUp : Form
{
databaseconnection db = new databaseconnection();
public SignUp()
{
InitializeComponent();
gb_login.Visible = false;
gb_Voornaam.Visible = false;
gb_Achternaam.Visible = false;
gb_leeftijdgeslacht.Visible = false;
gb_gewicht.Visible = false;
gb_email.Visible = false;
gb_Start.Visible = true;
}
private void btn_SignUp_Click(object sender, EventArgs e)
{
gb_Start.Visible = false;
gb_Voornaam.Visible = true;
}
private void btn_login_Click(object sender, EventArgs e)
{
gb_Start.Visible = false;
gb_login.Visible = true;
}
private void btn_loginvolgende_Click(object sender, EventArgs e)
{
gb_login.Visible = false;
// hier moet nog een GB!!!!!!
}
private void btn_voornaamvolgende_Click(object sender, EventArgs e)
{
gb_Voornaam.Visible = false;
gb_Achternaam.Visible = true;
}
private void btn_achternaamvolgende_Click(object sender, EventArgs e)
{
gb_Achternaam.Visible = false;
gb_leeftijdgeslacht.Visible = true;
}
private void btn_leeftijdvolgende_Click(object sender, EventArgs e)
{
gb_leeftijdgeslacht.Visible = false;
gb_gewicht.Visible = true;
}
// einde registratie
// opslaan van gegevens in database
private void btn_emailvolgende_Click(object sender, EventArgs e)
{
// gebruiker = new Gebruikerklasse();
// gebruiker.Naam = Convert.ToString(tb_voornaam.Text);
//// gebruiker.Achternaam = Convert.ToString(tb_achternaam.Text);
// gebruiker.Leeftijd = Convert.ToInt32(nud_leeftijd.Value);
/// gebruiker.Geslacht = Convert.ToString(cb_geslacht.Text);
// gebruiker.Huidig_gewicht = Convert.ToInt32(nud_huidiggewicht.Value);
// gebruiker.Streef_gewicht = Convert.ToInt32(nud_streefgewicht.Value);
/// gebruiker.Gebruikersnaam = Convert.ToString(tb_gebruikersnaam2.Text);
// gebruiker.Email = Convert.ToString(tb_email.Text);
// gebruiker.Wachtwoord = Convert.ToString(tb_wachtwoordsignup.Text);
db.AddGebruiker();
gb_email.Visible = false;
// hier moet nog een GB!!!!!
}
private void btn_gewichtvolgende_Click(object sender, EventArgs e)
{
gb_gewicht.Visible = false;
gb_email.Visible = true;
}
}
}
答案 0 :(得分：6)
插入SQL Server数据库的最简单方法：
string connectionString = @"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\Database2.mdf;Integrated Security=True";
string commandText = "INSERT INTO MyTable (ID, Name, Address) VALUES (10, 'Bob', '123 Main Street');";
using (SqlConnection conn = new SqlConnection(connectionString))
using (SqlCommand cmd = new SqlCommand(commandText, conn))
{
conn.Open();
cmd.ExecuteNonQuery();
conn.Close();
}
只要commandText是一个有效的查询，它就应该插入一行。最好为你的值使用参数而不是像我在这里那样硬编码 - 这可以避免SQL注入攻击和其他潜在的问题。您可以搜索Google（或者您现在提出的问题）并找到大量资源来帮助您。
如果您需要更具体的帮助，请发布详细信息，例如当您尝试运行代码时实际发生的情况 - 您是否会收到例外情况？
答案 1 :(得分：0)
在做其他事情之前，我要清理一堆东西。
首先，一起摆脱openconnection和closeconnection方法。并且不要为您的班级中的连接保留实例属性。使用using语句创建ondemand连接，因为在using语句的末尾，编译器将在连接的IDisposable接口实现上插入对Dispose方法的调用，它将自动关闭连接。
所以在清理了所有不必要的代码之后，你真正应该在这个类中实现的是Addgebrukier方法的实现，看起来像这样
public void AddGebruiker()
{
string query = "insert into Gebruiker VALUES(3, 'Cihan', 'Kurt', 18, 'Man', 85, 75, 'Admin1', 'Test123', 'testen');";
using (SqlConnection = new SqlConnection(connectionstring))
{
using (SqlCommand command = new SqlCommand(query, connection))
{
connection.Open();
int resultaat = command.ExecuteNonQuery();
if (resultaat == 1)
{
MessageBox.Show("succes");
}
else
{
MessageBox.Show("fail");
}
}
}
}
您还应该从app / web.config中的部分加载连接字符串，但是可以在运行后再执行此操作。
答案 2 :(得分：0)
这是一个简单的概念，应该对你完美无缺。只需更改ServerName，DatabaseName等
即可using System;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string connetionString = null;
SqlConnection connection ;
SqlDataAdapter adapter = new SqlDataAdapter();
string sql = null;
connetionString = "Data Source=ServerName;Initial Catalog=DatabaseName;User ID=UserName;Password=Password";
connection = new SqlConnection(connetionString);
sql = "insert into product (Product_id,Product_name,Product_price) values(6,'Product6',600)";
try
{
connection.Open();
adapter.InsertCommand = new SqlCommand(sql, connection);
adapter.InsertCommand.ExecuteNonQuery();
MessageBox.Show ("Row inserted !! ");
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
}
}