classid.cs

这是用SQL数据库做的学生信息管理系统。简明

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

namespace 学生与成绩
{
	/// <summary>
	/// ClassID 的摘要说明。
	/// </summary>
	public class ClassID : System.Windows.Forms.Form
	{
		public static string UserID,result;
		private DataSet ds=new DataSet();
		private string sendStrSQL="select * from 用户";
		private DataTable myTable;
		private DataRow myRow;
		private System.Windows.Forms.Button btnCancel;
		private System.Windows.Forms.Button btnConfirm;
		private System.Windows.Forms.TextBox txtPsw;
		private System.Windows.Forms.TextBox txtName;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.Label label1;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public ClassID()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();
			LinkDataBase link=new LinkDataBase();
			string sendTableName="用户";
			this.ds=link.SelectDataBase(sendStrSQL,sendTableName);
			myTable=ds.Tables[0];

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows 窗体设计器生成的代码
		/// <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.btnCancel = new System.Windows.Forms.Button();
			this.btnConfirm = new System.Windows.Forms.Button();
			this.txtPsw = new System.Windows.Forms.TextBox();
			this.txtName = new System.Windows.Forms.TextBox();
			this.label2 = new System.Windows.Forms.Label();
			this.label1 = new System.Windows.Forms.Label();
			this.SuspendLayout();
			// 
			// btnCancel
			// 
			this.btnCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel;
			this.btnCancel.Location = new System.Drawing.Point(163, 128);
			this.btnCancel.Name = "btnCancel";
			this.btnCancel.TabIndex = 16;
			this.btnCancel.Text = "取消";
			this.btnCancel.Click += new System.EventHandler(this.btnCancel_Click);
			// 
			// btnConfirm
			// 
			this.btnConfirm.Location = new System.Drawing.Point(59, 128);
			this.btnConfirm.Name = "btnConfirm";
			this.btnConfirm.TabIndex = 15;
			this.btnConfirm.Text = "确定";
			this.btnConfirm.Click += new System.EventHandler(this.btnConfirm_Click);
			// 
			// txtPsw
			// 
			this.txtPsw.Location = new System.Drawing.Point(150, 72);
			this.txtPsw.Name = "txtPsw";
			this.txtPsw.PasswordChar = '*';
			this.txtPsw.TabIndex = 12;
			this.txtPsw.Text = "";
			// 
			// txtName
			// 
			this.txtName.Location = new System.Drawing.Point(150, 34);
			this.txtName.Name = "txtName";
			this.txtName.TabIndex = 11;
			this.txtName.Text = "";
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(46, 72);
			this.label2.Name = "label2";
			this.label2.TabIndex = 14;
			this.label2.Text = "密码";
			this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(46, 32);
			this.label1.Name = "label1";
			this.label1.TabIndex = 13;
			this.label1.Text = "用户名";
			this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
			// 
			// ClassID
			// 
			this.AcceptButton = this.btnConfirm;
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.CancelButton = this.btnCancel;
			this.ClientSize = new System.Drawing.Size(296, 182);
			this.Controls.Add(this.btnCancel);
			this.Controls.Add(this.btnConfirm);
			this.Controls.Add(this.txtPsw);
			this.Controls.Add(this.txtName);
			this.Controls.Add(this.label2);
			this.Controls.Add(this.label1);
			this.Name = "ClassID";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterParent;
			this.Text = "用户登录";
			this.ResumeLayout(false);

		}
		#endregion

		private void btnConfirm_Click(object sender, System.EventArgs e)
		{
			for(int i=0;i<myTable.Rows.Count;i++)
			{
				myRow=myTable.Rows[i];
				if(this.txtName.Text.Trim()==myRow[1].ToString().Trim()&&this.txtPsw.Text.Trim()==myRow[2].ToString().Trim())
				{
					MainFrm.lg=true;
					UserID=myRow[4].ToString().Trim();
					result=this.GetClassName();
					this.Close();
					return;
				}
				
			}

			MessageBox.Show("用户名或密码错误");
			return;
		
		}
		private string GetClassName()
		{
			string StrSQL="workstation id=localhost;Integrated Security=SSPI;database=stu01";
			SqlConnection conn=new SqlConnection(StrSQL);
			conn.Open();
			SqlCommand cmd=conn.CreateCommand();
			cmd.CommandText="select 班级名称 from 班级 where(班级编号='"+UserID.Trim()+"')";
			object result=cmd.ExecuteScalar();
			return result.ToString();
		}

		private void btnCancel_Click(object sender, System.EventArgs e)
		{
			MainFrm.lg=false;
			this.Close();
		}
	}
}