browseclass.cs

C#编写的学籍管理系统

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

namespace WindowsApplication1
{
	/// <summary>
	/// bjll 的摘要说明。
	/// </summary>
	public class BrowseClass : System.Windows.Forms.Form
	{
		private System.Data.OleDb.OleDbConnection oleDbConnection1;
		private System.Windows.Forms.ComboBox comboBox1;
		private System.Windows.Forms.TextBox textBox1;
		private System.Windows.Forms.DataGrid dataGrid1;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.Button button3;
		private System.Windows.Forms.Button button4;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public BrowseClass()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// 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.oleDbConnection1 = new System.Data.OleDb.OleDbConnection();
			this.comboBox1 = new System.Windows.Forms.ComboBox();
			this.textBox1 = new System.Windows.Forms.TextBox();
			this.dataGrid1 = new System.Windows.Forms.DataGrid();
			this.label1 = new System.Windows.Forms.Label();
			this.label2 = new System.Windows.Forms.Label();
			this.button1 = new System.Windows.Forms.Button();
			this.button2 = new System.Windows.Forms.Button();
			this.button3 = new System.Windows.Forms.Button();
			this.button4 = new System.Windows.Forms.Button();
			((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
			this.SuspendLayout();
			// 
			// oleDbConnection1
			// 
			this.oleDbConnection1.ConnectionString = "Data Source=xsxxdb.mdb;Jet OLEDB:Engine Type=5;Provider=Microsoft.Jet." +
				"OLEDB.4.0;";
			// 
			// comboBox1
			// 
			this.comboBox1.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
			this.comboBox1.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.comboBox1.ForeColor = System.Drawing.SystemColors.ControlText;
			this.comboBox1.Location = new System.Drawing.Point(149, 21);
			this.comboBox1.Name = "comboBox1";
			this.comboBox1.Size = new System.Drawing.Size(171, 23);
			this.comboBox1.TabIndex = 1;
			// 
			// textBox1
			// 
			this.textBox1.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.textBox1.ForeColor = System.Drawing.SystemColors.ControlText;
			this.textBox1.Location = new System.Drawing.Point(469, 21);
			this.textBox1.Name = "textBox1";
			this.textBox1.Size = new System.Drawing.Size(96, 25);
			this.textBox1.TabIndex = 2;
			this.textBox1.Text = "2004";
			// 
			// dataGrid1
			// 
			this.dataGrid1.AllowSorting = false;
			this.dataGrid1.BackgroundColor = System.Drawing.SystemColors.Control;
			this.dataGrid1.CaptionBackColor = System.Drawing.SystemColors.ActiveBorder;
			this.dataGrid1.CaptionForeColor = System.Drawing.SystemColors.Highlight;
			this.dataGrid1.DataMember = "";
			this.dataGrid1.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
			this.dataGrid1.Location = new System.Drawing.Point(0, 62);
			this.dataGrid1.Name = "dataGrid1";
			this.dataGrid1.PreferredColumnWidth = 80;
			this.dataGrid1.PreferredRowHeight = 30;
			this.dataGrid1.ReadOnly = true;
			this.dataGrid1.Size = new System.Drawing.Size(832, 267);
			this.dataGrid1.TabIndex = 3;
			// 
			// label1
			// 
			this.label1.AutoSize = true;
			this.label1.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.label1.ForeColor = System.Drawing.SystemColors.ControlText;
			this.label1.Location = new System.Drawing.Point(32, 26);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(83, 21);
			this.label1.TabIndex = 4;
			this.label1.Text = "请选择专业";
			// 
			// label2
			// 
			this.label2.AutoSize = true;
			this.label2.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.label2.ForeColor = System.Drawing.SystemColors.ControlText;
			this.label2.Location = new System.Drawing.Point(373, 23);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(67, 21);
			this.label2.TabIndex = 5;
			this.label2.Text = "入学年份";
			// 
			// button1
			// 
			this.button1.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.button1.ForeColor = System.Drawing.SystemColors.ControlText;
			this.button1.Location = new System.Drawing.Point(619, 19);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(100, 30);
			this.button1.TabIndex = 6;
			this.button1.Text = "开始查询";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(128, 339);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(117, 30);
			this.button2.TabIndex = 7;
			this.button2.Text = "修改班级信息";
			this.button2.Click += new System.EventHandler(this.button2_Click);
			// 
			// button3
			// 
			this.button3.Location = new System.Drawing.Point(587, 339);
			this.button3.Name = "button3";
			this.button3.Size = new System.Drawing.Size(100, 30);
			this.button3.TabIndex = 8;
			this.button3.Text = "退出";
			this.button3.Click += new System.EventHandler(this.button3_Click);
			// 
			// button4
			// 
			this.button4.Location = new System.Drawing.Point(373, 339);
			this.button4.Name = "button4";
			this.button4.Size = new System.Drawing.Size(118, 30);
			this.button4.TabIndex = 9;
			this.button4.Text = "删除班级信息";
			this.button4.Click += new System.EventHandler(this.button4_Click);
			// 
			// BrowseClass
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(8, 18);
			this.ClientSize = new System.Drawing.Size(829, 384);
			this.Controls.Add(this.button4);
			this.Controls.Add(this.button3);
			this.Controls.Add(this.button2);
			this.Controls.Add(this.button1);
			this.Controls.Add(this.label2);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.textBox1);
			this.Controls.Add(this.dataGrid1);
			this.Controls.Add(this.comboBox1);
			this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
			this.Name = "BrowseClass";
			this.StartPosition = System.Windows.Forms.FormStartPosition.Manual;
			this.Text = "班级信息浏览";
			this.Load += new System.EventHandler(this.BrowseClass_Load);
			((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
			this.ResumeLayout(false);

		}
		#endregion

		private void BrowseClass_Load(object sender, System.EventArgs e)
		{
			//产生专业下拉列表
			string sql="select specialtyid,specialtyname from specialtyinfo";
			OleDbDataAdapter adp=new OleDbDataAdapter(sql,oleDbConnection1);
			oleDbConnection1.Open();
			DataSet ds=new DataSet();
			adp.Fill(ds,"specialty");
			comboBox1.DataSource=ds.Tables["specialty"].DefaultView;
			comboBox1.DisplayMember="specialtyname";
			comboBox1.ValueMember="specialtyid";
		}
        
		public bool strisyear(string s)
		{
			if (s.Trim().Length!=4)
				return (false);
			else
			{
				int n=1;
				for (int i=0;i<=s.Length-1;i++)
				{
					if (!System.Char.IsNumber(s[i]))
					{
						n=-1;
						break;
					}
				}
				if (n==1)
				    return (true);
				else
					return (false);
			}
		}
		DataSet ds;
		private void button1_Click(object sender, System.EventArgs e)
		{
			if (!strisyear(textBox1.Text.Trim()))
				MessageBox.Show("请输入合法的年份","错误");
			else
			{
				string sql="select classid as 班级编号,classname as 班级名称,specialtyname as 专业名称,classnumber as 教室位置,length as 年制,teacher as 办主任,enrolmenttime as 入校时间,remark as 备注 from classinfo where specialtyname='"+comboBox1.Text.ToString()+"' and year(enrolmenttime)="+textBox1.Text.ToString();
				OleDbDataAdapter adp=new OleDbDataAdapter(sql,oleDbConnection1);
				ds=new DataSet();
				ds.Clear();
				adp.Fill(ds,"class");
				if (ds.Tables[0].Rows.Count!=0)
				{
					dataGrid1.DataSource=ds.Tables[0].DefaultView;
					dataGrid1.CaptionText="共有"+ds.Tables[0].Rows.Count+"条查询结果";
				}
				else
				{
					dataGrid1.CaptionText="没有您所查找的班级信息";
					dataGrid1.DataSource=null;
				}
			}
		}
        
		public ModifyClass modifyclass;

		private void button2_Click(object sender, System.EventArgs e)
		{
			if (dataGrid1.DataSource!=null && dataGrid1[dataGrid1.CurrentCell]!=null)
			{
				modifyclass=new ModifyClass();
				modifyclass.Tag=ds.Tables["class"].Rows[dataGrid1.CurrentCell.RowNumber][0].ToString().Trim();
                modifyclass.textBox1.Text=ds.Tables["class"].Rows[dataGrid1.CurrentCell.RowNumber][1].ToString().Trim();
				modifyclass.label9.Text=ds.Tables["class"].Rows[dataGrid1.CurrentCell.RowNumber][2].ToString().Trim();
				modifyclass.textBox3.Text=ds.Tables["class"].Rows[dataGrid1.CurrentCell.RowNumber][3].ToString().Trim();
				modifyclass.numericUpDown1.Value=int.Parse(ds.Tables["class"].Rows[dataGrid1.CurrentCell.RowNumber][4].ToString().Trim());
				modifyclass.textBox5.Text=ds.Tables["class"].Rows[dataGrid1.CurrentCell.RowNumber][5].ToString().Trim();
				modifyclass.dateTimePicker1.Text=ds.Tables["class"].Rows[dataGrid1.CurrentCell.RowNumber][6].ToString().Trim();
				modifyclass.textBox2.Text=ds.Tables["class"].Rows[dataGrid1.CurrentCell.RowNumber][7].ToString().Trim();
				modifyclass.ShowDialog();
			}
			else
                MessageBox.Show("您所选定的班级无效","提示");
		}

		private void button3_Click(object sender, System.EventArgs e)
		{
			this.Close();
		}

		private void button4_Click(object sender, System.EventArgs e)
		{
			if (dataGrid1.DataSource!=null && dataGrid1[dataGrid1.CurrentCell]!=null)
			{
				string sql="select classname from classinfo where classid="+ds.Tables["class"].Rows[dataGrid1.CurrentCell.RowNumber][0].ToString().Trim()+" and classid not in (select distinct classid from studentinfo)";
				OleDbCommand cmd=new OleDbCommand(sql,oleDbConnection1);
				OleDbDataReader dr;
				dr=cmd.ExecuteReader();
				if (!dr.Read())
				{
					MessageBox.Show("删除班级'"+ds.Tables["class"].Rows[dataGrid1.CurrentCell.RowNumber][1].ToString().Trim()+"'失败，请先删除该班级的学生","提示");
					dr.Close();
				}
				else
				{
					dr.Close();
					//首先删除与班级相关的课程
					sql="delete * from courseinfo where classid="+ds.Tables["class"].Rows[dataGrid1.CurrentCell.RowNumber][0].ToString().Trim();
					cmd.CommandText=sql;
					cmd.ExecuteNonQuery();
                    //然后删除所指定的班级
					sql="delete * from classinfo where classid="+ds.Tables["class"].Rows[dataGrid1.CurrentCell.RowNumber][0].ToString().Trim();
					cmd.CommandText=sql;
					cmd.ExecuteNonQuery();
					MessageBox.Show("删除班级'"+ds.Tables["class"].Rows[dataGrid1.CurrentCell.RowNumber][1].ToString().Trim()+"'成功","提示");
				}
			}
			else
                MessageBox.Show("您所选定的班级无效","提示");
		}

	}
}