无法使用 C# Visual Studio 2008 将数据插入表中

Question

你好，我试图创建简单的学生表格 n 将数据添加到数据库中，但不能这样做，程序执行期间没有错误，应用程序执行良好但表中没有变化，n 值是nt 插入表中，请问问题可能是什么，我在下面写我的代码.. 提前谢谢:)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;

namespace School.Project
{

class Student
{
    public static string constr = System.Configuration.ConfigurationManager.ConnectionStrings"SchoolConnectionString"].ConnectionString;

    public static int AddStudent(string title, string fname, string lname, string fathername, string gender, string clas, string sec, int age, string dob, string religion, string caste, string image, string address, string homeno, string cell, string email)
    {
        SqlConnection con = new SqlConnection(constr);
        con.Open();
        SqlTransaction t = con.BeginTransaction();

        SqlCommand cmd = new SqlCommand("INSERT INTO Student (Title,FirstName,LastName,FatherName,Gender,Class,Section,Age,DateOfBirth,Religion,Caste,Image,Address,HomePhone,CellPhone,Email) VALUES(@Title,@FirstName,@LastName,@FatherName,@Gender,@Class,@Section,@Age,@DateOFBirth,@Religion,@Caste,@Image,@Address,@HomePhone,@CellPhone,@Email)",con);
        cmd.Parameters.AddWithValue("@Title", title);
        cmd.Parameters.AddWithValue("FirstName", fname);
        cmd.Parameters.AddWithValue("LastName", lname);
        cmd.Parameters.AddWithValue("@FatherName", fathername);
        cmd.Parameters.AddWithValue("@Gender", gender);
        cmd.Parameters.AddWithValue("@Class", clas);
        cmd.Parameters.AddWithValue("@Section", sec);
        cmd.Parameters.AddWithValue("Age", age);
        cmd.Parameters.AddWithValue("DateOfBirth", dob);
        cmd.Parameters.AddWithValue("@Religion", religion);
        cmd.Parameters.AddWithValue("Caste", caste);
        cmd.Parameters.AddWithValue("Image", image);
        cmd.Parameters.AddWithValue("Address", address);
        cmd.Parameters.AddWithValue("@HomePhone", homeno);
        cmd.Parameters.AddWithValue("@CellPhone", cell);
        cmd.Parameters.AddWithValue("@Email", email);
        cmd.Transaction = t;

        int i = cmd.ExecuteNonQuery();
        t.Commit();
        con.Close();
        return i;
    }

    private void btSave_Click(object sender, EventArgs e)
    {
        string title = cbTitle.SelectedItem.ToString();
        string fname = txtfname.Text;
        string lname = txtlname.Text;
        string fathername = txtfatherName.Text;
        string gender = cbGender.SelectedItem.ToString();
        string clas = cbClass.SelectedItem.ToString();
        string section = cbSection.SelectedItem.ToString();
        int age = int.Parse(txtAge.Text);
        string dob = txtdob.Text;
        string religion = txtReligion.Text;
        string caste = txtCaste.Text;
        string imagepath = txtpath.Text;
        string address = txtAddress.Text;
        string homeno = txtHome.Text;
        string cell = txtCell.Text;
        string email = txtEMail.Text;

        int i = Project.Student.AddStudent(title, fname, lname, fathername, gender, clas, section, age, dob, religion, caste, imagepath, address, homeno, cell, email);
        if (i == 1)
        {
            MessageBox.Show("Student Added Succesfully, Thanq", "Inserted", MessageBoxButtons.OK, MessageBoxIcon.Information);
            ClearAll();
        }
        else
        {
            MessageBox.Show("Couldnt enter the data", "error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
    }

Answer 1

在查询的某些字段上添加括号[ ]，因为其中一些是保留字：

SqlCommand cmd = new SqlCommand("
INSERT INTO Student ([Title],FirstName,LastName,
                      FatherName,Gender,
                      [Class],Section,Age,DateOfBirth,
                      Religion,Caste,[Image],Address,
                      HomePhone,CellPhone,Email)             
VALUES(@Title,@FirstName,@LastName,
       @FatherName,@Gender,@Class,@Section,
       @Age,@DateOFBirth,@Religion,@Caste,
       @Image,@Address,@HomePhone,
       @CellPhone,@Email)",con);

[标题]

[图片]

更新 1

而不是SqlTransaction t = con.BeginTransaction();

试试这个：

SqlTransaction t = con.BeginTransaction(IsolationLevel.ReadCommitted)

Source: Use database transactions

Answer 2

您的某些参数包含“@”符号，而有些则不包含....

Answer 3

1.) 不要传递这么多参数。你想添加一个学生，这应该会响起你所有的钟声。只传递一个参数 - 用你想要的值填充的学生类。

2.) 我认为这里不需要交易。你只想推送一个对象，所以如果它失败了，结果是一样的——没有做任何改变。

3.) 正如达伦所说，您的查询中没有正确编写参数

编辑： 刚刚尝试了简化版本，它就像一个魅力......这是代码：

页面.aspx.cs

public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            btn.Click += new EventHandler(btn_Click);

        }

        void btn_Click(object sender, EventArgs e)
        {
            Student student = new Student() { Id = 1, Name = "John" };
            int rowsAffected = Student.AddStudent(student);

            Response.Write(rowsAffected);
        }
    }


    public class Student
    {
        public int Id { get; set; }
        public string Name { get; set; }

        public static int AddStudent(Student s)
        {
            string conString = System.Configuration.ConfigurationManager.ConnectionStrings["string1"].ConnectionString;

            using (SqlConnection con = new SqlConnection(conString))
            {
                con.Open();

                SqlCommand cmd = new SqlCommand("INSERT INTO Students (Name) VALUES (@Name)", con);
                cmd.Parameters.AddWithValue("@Name", s.Name);
                return cmd.ExecuteNonQuery();
            }
        }
    }

请尝试修改它以满足您的需求，如果它最终有效，请告诉我。它有一些问题（比如没有将学生类放在单独的文件中），但我希望你能明白。