courseregister.aspx.cs

数据库课程设计

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

namespace web
{
	/// <summary>
	/// studentRegister 的摘要说明。
	/// </summary>
	public class studentRegister : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Label Label2;
		protected System.Web.UI.WebControls.Label Label3;
		protected System.Web.UI.WebControls.TextBox TextBox1;
		protected System.Web.UI.WebControls.TextBox TextBox2;
		protected System.Web.UI.WebControls.TextBox TextBox3;
		protected System.Web.UI.WebControls.Button btn_addCourse;
		protected System.Web.UI.WebControls.DataGrid dg_course;
		protected System.Web.UI.WebControls.Label Label4;
		protected System.Web.UI.WebControls.Label Label1;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			// 在此处放置用户代码以初始化页面
		}

		#region Web 窗体设计器生成的代码
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{    
			this.btn_addCourse.Click += new System.EventHandler(this.btn_addCourse_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void btn_addCourse_Click(object sender, System.EventArgs e)
		{
			string id = TextBox1.Text;
			string name = TextBox2.Text;
			decimal credit = Convert.ToDecimal(TextBox3.Text);

			if (insertCour(id, name, credit))
			{
				SqlConnection conn = new SqlConnection("User ID=sa;pwd=5111863;Initial Catalog=data;server=.");
				conn.Open();

				SqlDataAdapter sda = new SqlDataAdapter();
				sda.SelectCommand = new SqlCommand("select * from course", conn);
				DataSet ds = new DataSet();
				sda.Fill(ds, "addCourse");
				
				dg_course.DataSource = ds.Tables["addCourse"];
				dg_course.DataBind();
			}		
		}
		
		private bool insertCour(string courID, string courName, decimal courCredit)
		{
			try
			{
				SqlConnection conn = new SqlConnection("User ID=sa;pwd=5111863;Initial Catalog=data;server=.");
				conn.Open();

				SqlCommand cmd = new SqlCommand("insert into course values(@cid, @cname, @ccredit)", conn);

				SqlParameter para = new SqlParameter("@cid", SqlDbType.Char, 10);
				para.Value = courID;
				cmd.Parameters.Add(para);

				para = new SqlParameter("@cname", SqlDbType.Char, 20);
				para.Value = courName;
				cmd.Parameters.Add(para);

				para = new SqlParameter("@ccredit", SqlDbType.Decimal, 9);
				para.Value = courCredit;
				cmd.Parameters.Add(para);

				cmd.ExecuteNonQuery();
				return true;
			}
			catch (Exception e)
			{
				Label4.Text="您可能违反了 PRIMARY KEY 约束 'PK_course'规则。不能在对象 'course' 中插入重复键！请检查您的输入！";
				Label4.ForeColor=Color.Red;
				Label4.Visible=true;
				return false;
			}
		}
	}
}