我正在为一个学校项目开发一个应用程序，但在将数据添加到 sql 数据库时遇到了麻烦。计划是用户将单击一个按钮来“添加”数据，这将打开一个带有各种文本框的新表单，用于输入数据。满意后，用户单击“添加详细信息”，然后将这些信息添加到 sql 数据库中。问题是 try catch 不断返回错误，我不知道为什么，对于有新眼光的人来说，这可能是一个简单的解决方法。代码如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace CarsULike
{
public partial class AddCust : Form
{
public AddCust()
{
InitializeComponent();
}
private void AddCust_Load(object sender, EventArgs e)
{
}
private void AddCustBtn_Click(object sender, EventArgs e)
{
if (FirstNameTxtBox.Text == "")
{
MessageBox.Show("Please enter a First Name");
}
else if (SurnameTxtBox.Text == "")
{
MessageBox.Show("Please enter a Surname");
}
else if (TitleTxtBox.Text == "")
{
MessageBox.Show("Please enter a Title");
}
else if (Address1TxtBox.Text == "")
{
MessageBox.Show("Please enter an address");
}
else if (TownCityTxtBox.Text == "")
{
MessageBox.Show("Please enter a Town/City");
}
else if (PostCodeTxtBox.Text == "")
{
MessageBox.Show("Please enter a Postcode");
}
else
{
//stores the values entered as variables
string firstName = FirstNameTxtBox.Text;
string surname = SurnameTxtBox.Text;
string title = TitleTxtBox.Text;
string address1 = Address1TxtBox.Text;
string address2 = Address2TxtBox.Text;
string townCity = TownCityTxtBox.Text;
string postCode = PostCodeTxtBox.Text;
string mobPhone = MobPhoneTxtBox.Text;
string homePhone = HomePhoneTxtBox.Text;
}
//establishes a connection with the database
SqlConnection connection = new SqlConnection(@"Data Source=Lee-PC\SQLEXPRESS; Initial Catalog=CarsULike_P116274;Integrated Security=True");
SqlCommand cmd = new SqlCommand();
//SqlDataReader datareader;
string sql;
try
{
// this query is for insertion into the Customer table
sql = "INSERT INTO Customer (FirstName, Surname, Title, AddressLine1, AddressLine2, TownCity, PostCode, EmailAddress, MobilePhoneNo, HomePhoneNo)";
sql += String.Format("VALUES, @FirstName, @Surname, @Title, @AddressLine1, @AddressLine2, @TownCity, @PostCode, @EmailAddress, @MobilePhoneNo, @HomePhoneNo)");
cmd = new SqlCommand(sql, connection);
cmd.CommandText = sql;
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue("@FirstName", FirstNameTxtBox.Text);
cmd.Parameters.AddWithValue("@Surname", SurnameTxtBox.Text);
cmd.Parameters.AddWithValue("@Title", TitleTxtBox.Text);
cmd.Parameters.AddWithValue("@AddressLine1", Address1TxtBox.Text);
cmd.Parameters.AddWithValue("@AddressLine2", Address2TxtBox.Text);
cmd.Parameters.AddWithValue("@TownCity", TownCityTxtBox.Text);
cmd.Parameters.AddWithValue("@PostCode", PostCodeTxtBox.Text);
cmd.Parameters.AddWithValue("@EmailAddress", MobPhoneTxtBox.Text);
cmd.Parameters.AddWithValue("@MobilePhoneNo", HomePhoneTxtBox.Text);
cmd.Parameters.AddWithValue("@HomePhoneNo", HomePhoneTxtBox.Text);
connection.Open(); //opens connection
cmd.ExecuteNonQuery(); //writes to the database
MessageBox.Show("Details Added", "Successful");
}
catch (SqlException ex)
{
throw new Exception("Error adding details", ex);
}
finally
{
connection.Close(); // Close connection
}
}
private void CancelAddCustBtn_Click(object sender, EventArgs e)
{
this.Close(); // Close current form
}
}
我环顾四周，但似乎找不到我要找的东西..或者我只是不知道我在找什么！