利用DataGridView类编写的学生信息登记系统

步骤一

数据库以及表的创建



*对于数据库张字段的数据类型的使用，方便数据在输入的时候不会出错，进而经常会使用varchar类型

*对于涉及到的数据库连接对单独放到可配置文件当中

即app文件



 

步骤二

利用winform窗体的进行相关控件的使用

*主要控件的使用DateGridView控件

DateGridView控件的相关的属性：row 、cells、

DateGridView控件的相关的事件：cellsClick

DateGridView控件的相关的类：DateGridViewRow



步骤三

在vs中进行编码的编写

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;

using System.Configuration;

namespace xiangmu

{

    public partial class 数据查询 : Form

    {

        public 数据查询()

        {

            InitializeComponent();

        }

  private void Date()

        {

              #region   对数据库中的数据进行查询

            //创建可配置文件，进行存放数据库的连接

            string sql = ConfigurationManager.ConnectionStrings["sql"].ConnectionString;

            //应用SqlConnection类建立连接的对象

            SqlConnection conn = new SqlConnection(sql);

            //打开数据库

            conn.Open();

            //应用SqlCommand类建立命令对象

            //三种格式创建命令对象

            SqlCommand comm = conn.CreateCommand();

            comm.CommandText = "select *from information where
name=@name or Mobile
=@Mobile ";

            /*SqlCommand comm=new SqlCommand();

            comm.Connection = conn;

            comm.CommandText = "select *from information where
name=@name or Mobile
=@Mobile ";*/

            /*SqlCommand comm=new SqlCommand("select *from information where
name=@name or Mobile
=@Mobile",conn);*/

            comm.Parameters.AddWithValue("@name", textBox1.Text.ToString());

            comm.Parameters.AddWithValue("@Mobile", textBox1.Text.ToString());

            //应用数据适配器创建对象，执行数据库语句，获得相关的数据

            SqlDataAdapter adapter = new SqlDataAdapter(comm);

            //应用数据表类，创建对象，进行数据库的数据的存放

            DataTable data = new DataTable();

            //将从数据库获得信息放置在数据表类中的一个对象当中，实现从数据库中显示在vs中

            adapter.Fill(data);

            this.dataGridView1.DataSource = data;

            //数据库连接的关闭

            conn.Close();

            //命令的释放

            comm.Dispose();

            //连接的释放

            #endregion

}

     private void button1_Click(object sender, EventArgs e)

        {

            //对数据查询函数的调用

            Date();

        }

        private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)

        {

            #region 从 DataGridView控件中获得相关的信息

            if (this.dataGridView1.SelectedRows.Count > 0)

            {

                //应用 DataGridViewRow 类创建他的对象，

                DataGridViewRow row = this.dataGridView1.SelectedRows[0];

 

                //从 DataGridView控件中获得相关的信息

                this.textBox2.Text = row.Cells[0].Value.ToString();

                this.textBox6.Text = row.Cells[1].Value.ToString();

                string gender = row.Cells[2].Value.ToString();

                if (gender == "男")

                {

                    radioButton1.Checked = true;

                }

                if (gender == "女")

                {

                    radioButton2.Checked = true;

                }

                this.textBox3.Text = row.Cells[3].Value.ToString();

                this.comboBox1.Text = "";

                this.comboBox1.Text = row.Cells[4].Value.ToString();

                this.comboBox2.Text = "";

                this.comboBox2.Text = row.Cells[5].Value.ToString();

                this.textBox4.Text = row.Cells[6].Value.ToString();

                this.textBox5.Text = row.Cells[7].Value.ToString();

                #endregion

            }

        }

        private void button2_Click(object sender, EventArgs e)

        {

            #region   对数据中的数据进行更改

            string sql = ConfigurationManager.ConnectionStrings["sql"].ConnectionString;

            SqlConnection conn = new SqlConnection(sql);

            conn.Open();

            SqlCommand comm = conn.CreateCommand();

            string id = textBox1.Text;

            //对数据进行更改

            comm.CommandText = "update information set 
name=@name, sex=@sex ,Mobile=@Mobile,fasten=@fasten ,award=@award ,scord=@scord ,address=@address whereId=@id
";

            comm.Parameters.AddWithValue("@id", textBox6.Text.ToString());

            comm.Parameters.AddWithValue("@name", textBox2.Text.ToString());

            if (radioButton1.Checked == true)

            {

                comm.Parameters.AddWithValue("@sex", radioButton1.Text.ToString());

            }

            if (radioButton2.Checked == true)

            {

                comm.Parameters.AddWithValue("@sex", radioButton2.Text.ToString());

            }

            comm.Parameters.AddWithValue("@Mobile", textBox3.Text.ToString());

            comm.Parameters.AddWithValue("@fasten", comboBox1.Text.ToString());

            comm.Parameters.AddWithValue("@award", comboBox2.Text.ToString());

            comm.Parameters.AddWithValue("@scord ", textBox4.Text.ToString());

            comm.Parameters.AddWithValue("@address", textBox5.Text.ToString());

            comm.ExecuteNonQuery();

            MessageBox.Show("更改成功");

            Date();

            #endregion

        }

        private void button3_Click(object sender, EventArgs e)

        {

            #region 对数据库中的数据进行删除

            DataGridViewRow row = this.dataGridView1.SelectedRows[0];

            string sql = "Data Source=(local);Initial Catalog=denglu;Integrated Security=True";

            SqlConnection conn = new SqlConnection(sql);

            conn.Open();

            SqlCommand comm = conn.CreateCommand();

            string id = textBox1.Text;

            comm.CommandText = "delete from  information where
Id=@Id";

            comm.Parameters.AddWithValue("@Id", row.Cells[1].Value.ToString());

            comm.ExecuteNonQuery();

            comm.Dispose();

            conn.Close();

            conn.Dispose();

            MessageBox.Show("删除成功");

            textBox2.Text = "";

            textBox6.Text = "";

            textBox3.Text = "";

            comboBox1.Text = "";

            comboBox2.Text = "";

            textBox4.Text = "";

            textBox5.Text = "";

            //获取当前选中的行，返回值为DataGridViewRow

            this.dataGridView1.Rows.Remove(row);

            #endregion

        }

    }

}

       在很多时候坐在电脑面前编写代码，对一个小程序的思考后，按照自己的思路将效果实现，这里的思考，有时我们会把问题思考的变得稍微难一些。其结果，我们可以看到几行代码就可以让我们看到很好的有趣的程序的诞生，所以，我们对于编程，用简单的代码编写最完美的程序。