scholastic/Form6_1.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace scholastic
{
    public partial class Form6_1 : Form
    {
        SqlConnection mycon;
        string  sdept,smajor,syear,sclass, snum;
        public Form6_1()
        {
            InitializeComponent();
        }

        private void Form6_1_Load(object sender, EventArgs e)
        {
            string constr = "server=.\\sql2005;database=mydata;uid=sa;pwd=sa";
            mycon = new SqlConnection(constr);
            mycon.Open();
            SqlCommand mycom = new SqlCommand("select distinct(所在系) from major", mycon);
            SqlDataReader myread = mycom.ExecuteReader();   //定义SqlDataReader对象并读取数据信息
            comboBox1.Items.Clear();   //清空comBox1的数据项
            while (myread.Read())
            {
                comboBox1.Items.Add(myread[0].ToString());    //把系信息添加到下拉列表框中
            }
            myread.Close();
            myread.Dispose();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "" || textBox2.Text == "" || textBox3.Text == "" || textBox4.Text == "")
            {
                MessageBox.Show("输入的信息不完整，请重新输入！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                string constr = "server=.\\sql2005;database=mydata;uid=sa;pwd=sa";
                SqlConnection mycon = new SqlConnection(constr);
                mycon.Open();
                string myinsert = "insert into class(所在系,专业,年级,班级,人数) values('"+comboBox1.Text+"','" + textBox1.Text + "','" + textBox2.Text + "'," + Convert.ToInt32(textBox3.Text) + "," + Convert.ToInt32(textBox4.Text) + ")";    //insert插入语句
                SqlCommand mycom = new SqlCommand(myinsert, mycon);   //定义SqlCommand对象，并连接数据库
                mycom.ExecuteNonQuery();
                mycon.Close();
                mycon.Dispose();
                MessageBox.Show("已成功向数据库表中插入一条记录！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                sdept = comboBox1.Text;
                smajor = textBox1.Text;
                syear = textBox2.Text;
                sclass = textBox3.Text;
                snum = textBox4.Text;
                textBox1.Text = "";