stu2.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>
	/// Stu2 的摘要说明。
	/// </summary>
	public class Stu2 : System.Windows.Forms.Form
	{
		public static string UserID,ClassID;
		private DataSet ds=new DataSet();
		private LinkDataBase link=new LinkDataBase();
		private string sendStrSQL;
		private string sendTableName;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.ComboBox comboClass;
		private System.Windows.Forms.ComboBox comboDepartment;
		private System.Windows.Forms.DataGrid dataGrid1;
		private System.Data.SqlClient.SqlDataAdapter da1;
		private System.Data.SqlClient.SqlCommand sqlSelectCommand1;
		private System.Data.SqlClient.SqlConnection sqlConnection1;
		private 学生与成绩.DataSet3 dataSet31;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Stu2()
		{
			//
			// 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.label1 = new System.Windows.Forms.Label();
			this.label2 = new System.Windows.Forms.Label();
			this.comboClass = new System.Windows.Forms.ComboBox();
			this.comboDepartment = new System.Windows.Forms.ComboBox();
			this.dataGrid1 = new System.Windows.Forms.DataGrid();
			this.dataSet31 = new 学生与成绩.DataSet3();
			this.da1 = new System.Data.SqlClient.SqlDataAdapter();
			this.sqlSelectCommand1 = new System.Data.SqlClient.SqlCommand();
			this.sqlConnection1 = new System.Data.SqlClient.SqlConnection();
			((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
			((System.ComponentModel.ISupportInitialize)(this.dataSet31)).BeginInit();
			this.SuspendLayout();
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(333, 13);
			this.label1.Name = "label1";
			this.label1.TabIndex = 0;
			this.label1.Text = "选择班级";
			this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(39, 13);
			this.label2.Name = "label2";
			this.label2.TabIndex = 1;
			this.label2.Text = "选择系部";
			this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
			// 
			// comboClass
			// 
			this.comboClass.Location = new System.Drawing.Point(438, 16);
			this.comboClass.Name = "comboClass";
			this.comboClass.Size = new System.Drawing.Size(216, 20);
			this.comboClass.TabIndex = 2;
			this.comboClass.SelectedIndexChanged += new System.EventHandler(this.comboClass_SelectedIndexChanged);
			// 
			// comboDepartment
			// 
			this.comboDepartment.Location = new System.Drawing.Point(144, 16);
			this.comboDepartment.Name = "comboDepartment";
			this.comboDepartment.Size = new System.Drawing.Size(184, 20);
			this.comboDepartment.TabIndex = 3;
			this.comboDepartment.SelectedIndexChanged += new System.EventHandler(this.comboDepartment_SelectedIndexChanged);
			// 
			// dataGrid1
			// 
			this.dataGrid1.DataMember = "STU";
			this.dataGrid1.DataSource = this.dataSet31;
			this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
			this.dataGrid1.Location = new System.Drawing.Point(30, 48);
			this.dataGrid1.Name = "dataGrid1";
			this.dataGrid1.ReadOnly = true;
			this.dataGrid1.Size = new System.Drawing.Size(632, 192);
			this.dataGrid1.TabIndex = 4;
			// 
			// dataSet31
			// 
			this.dataSet31.DataSetName = "DataSet3";
			this.dataSet31.Locale = new System.Globalization.CultureInfo("zh-CN");
			// 
			// da1
			// 
			this.da1.SelectCommand = this.sqlSelectCommand1;
			this.da1.TableMappings.AddRange(new System.Data.Common.DataTableMapping[] {
																						  new System.Data.Common.DataTableMapping("Table", "STU", new System.Data.Common.DataColumnMapping[] {
																																																 new System.Data.Common.DataColumnMapping("学号", "学号"),
																																																 new System.Data.Common.DataColumnMapping("姓名", "姓名"),
																																																 new System.Data.Common.DataColumnMapping("性别", "性别"),
																																																 new System.Data.Common.DataColumnMapping("出生", "出生"),
																																																 new System.Data.Common.DataColumnMapping("班级编号", "班级编号"),
																																																 new System.Data.Common.DataColumnMapping("地址", "地址"),
																																																 new System.Data.Common.DataColumnMapping("电话", "电话"),
																																																 new System.Data.Common.DataColumnMapping("手机", "手机"),
																																																 new System.Data.Common.DataColumnMapping("毕业否", "毕业否")})});
			// 
			// sqlSelectCommand1
			// 
			this.sqlSelectCommand1.CommandText = "SELECT 学号, 姓名, 性别, 出生, 班级编号, 地址, 电话, 手机, 毕业否 FROM STU";
			this.sqlSelectCommand1.Connection = this.sqlConnection1;
			// 
			// sqlConnection1
			// 
			this.sqlConnection1.ConnectionString = "workstation id=localhost;packet size=4096;integrated security=SSPI;data source=ys" +
				"js44;persist security info=False;initial catalog=stu01";
			// 
			// Stu2
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(692, 246);
			this.Controls.Add(this.dataGrid1);
			this.Controls.Add(this.comboDepartment);
			this.Controls.Add(this.comboClass);
			this.Controls.Add(this.label2);
			this.Controls.Add(this.label1);
			this.Name = "Stu2";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "显示某班级学生情况";
			this.Load += new System.EventHandler(this.Stu2_Load);
			((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
			((System.ComponentModel.ISupportInitialize)(this.dataSet31)).EndInit();
			this.ResumeLayout(false);

		}
		#endregion

		private void Stu2_Load(object sender, System.EventArgs e)
		{
			da1.Fill(dataSet31,"STU");

			string StrConn="workstation id=localhost;Integrated Security=SSPI;database=stu01";
			SqlConnection conn=new SqlConnection(StrConn);
			conn.Open();
			SqlCommand cmd=conn.CreateCommand();
			cmd.CommandText="select distinct 名称 from 系部";
			SqlDataReader dr=cmd.ExecuteReader();
			while(dr.Read())
			{
				this.comboDepartment.Items.Add(dr.GetValue(0).ToString().Trim());
			}
			
		}
		private void GetClass()
		{
			string StrConn="workstation id=localhost;Integrated Security=SSPI;database=stu01";
			SqlConnection conn=new SqlConnection(StrConn);
			conn.Open();
			SqlCommand cmd=conn.CreateCommand();
			UserID=this.GetClassID();
			cmd.CommandText="select distinct 班级名称 from 班级 where(系部编号='"+UserID.Trim()+"')";
			SqlDataReader dr=cmd.ExecuteReader();
			while(dr.Read())
			{
				this.comboClass.Items.Add(dr.GetValue(0).ToString().Trim());
			}
		}
		//系部名称和系部编号的相互转换
		private string GetClassID()
		{
			string StrConn="workstation id=localhost;Integrated Security=SSPI;database=stu01";
			SqlConnection conn=new SqlConnection(StrConn);
			conn.Open();
			SqlCommand cmd=conn.CreateCommand();
			cmd.CommandText="select 编号 from 系部 where(名称='"+this.comboDepartment.Text.Trim()+"')";
			object UserID=cmd.ExecuteScalar();
			return UserID.ToString();
		}
        //获取班级编号
		private string GetID()
		{
			string StrConn="workstation id=localhost;Integrated Security=SSPI;database=stu01";
			SqlConnection conn=new SqlConnection(StrConn);
			conn.Open();
			SqlCommand cmd=conn.CreateCommand();
			cmd.CommandText="select 班级编号 from 班级 where(班级名称='"+this.comboClass.Text.Trim()+"')";
			object ClassID=cmd.ExecuteScalar();
			return ClassID.ToString();
		}
		private void comboDepartment_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			    
			
				if(this.comboDepartment.Text!="")
				{
					this.GetClass();
				}

		}

		private void comboClass_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			ClassID=this.GetID();
			this.sendStrSQL="select * from STU where(班级编号='"+ClassID.Trim()+"')";
			this.sendTableName="STU";
			this.ds=link.SelectDataBase(sendStrSQL,sendTableName);
			this.dataGrid1.DataSource=ds;
			this.dataGrid1.DataMember="STU";
		}
	}
}