addstu.cs

学生信息管理系统： 采用C#编写

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

namespace Students
{
	/// <summary>
	/// AddStu 的摘要说明。
	/// </summary>
	public class AddStu : System.Windows.Forms.Form
	{
		private System.Windows.Forms.TextBox textBox9;
		private System.Windows.Forms.TextBox textBox8;
		private System.Windows.Forms.TextBox textBox6;
		private System.Windows.Forms.TextBox textBox5;
		private System.Windows.Forms.Label label10;
		private System.Windows.Forms.Label label9;
		private System.Windows.Forms.Label label7;
		private System.Windows.Forms.Label label6;
		private System.Windows.Forms.Button StuInfo;
		private string  connectstr = "data source=WJD;Initial Catalog=students;integrated security=SSPI;";
		private System.Windows.Forms.Button button1;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public AddStu()
		{
			//
			// 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.textBox9 = new System.Windows.Forms.TextBox();
			this.textBox8 = new System.Windows.Forms.TextBox();
			this.textBox6 = new System.Windows.Forms.TextBox();
			this.textBox5 = new System.Windows.Forms.TextBox();
			this.label10 = new System.Windows.Forms.Label();
			this.label9 = new System.Windows.Forms.Label();
			this.label7 = new System.Windows.Forms.Label();
			this.label6 = new System.Windows.Forms.Label();
			this.StuInfo = new System.Windows.Forms.Button();
			this.button1 = new System.Windows.Forms.Button();
			this.SuspendLayout();
			// 
			// textBox9
			// 
			this.textBox9.Location = new System.Drawing.Point(128, 158);
			this.textBox9.Name = "textBox9";
			this.textBox9.TabIndex = 24;
			this.textBox9.Text = "";
			// 
			// textBox8
			// 
			this.textBox8.Location = new System.Drawing.Point(128, 118);
			this.textBox8.Name = "textBox8";
			this.textBox8.TabIndex = 23;
			this.textBox8.Text = "";
			// 
			// textBox6
			// 
			this.textBox6.Location = new System.Drawing.Point(128, 78);
			this.textBox6.Name = "textBox6";
			this.textBox6.TabIndex = 22;
			this.textBox6.Text = "";
			// 
			// textBox5
			// 
			this.textBox5.Location = new System.Drawing.Point(128, 38);
			this.textBox5.Name = "textBox5";
			this.textBox5.TabIndex = 21;
			this.textBox5.Text = "";
			// 
			// label10
			// 
			this.label10.Location = new System.Drawing.Point(64, 158);
			this.label10.Name = "label10";
			this.label10.Size = new System.Drawing.Size(56, 23);
			this.label10.TabIndex = 20;
			this.label10.Text = "学院编号";
			this.label10.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
			// 
			// label9
			// 
			this.label9.Location = new System.Drawing.Point(88, 118);
			this.label9.Name = "label9";
			this.label9.Size = new System.Drawing.Size(32, 23);
			this.label9.TabIndex = 19;
			this.label9.Text = "年龄";
			this.label9.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
			// 
			// label7
			// 
			this.label7.Location = new System.Drawing.Point(64, 78);
			this.label7.Name = "label7";
			this.label7.Size = new System.Drawing.Size(56, 23);
			this.label7.TabIndex = 18;
			this.label7.Text = "学生姓名";
			this.label7.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
			// 
			// label6
			// 
			this.label6.Location = new System.Drawing.Point(80, 38);
			this.label6.Name = "label6";
			this.label6.Size = new System.Drawing.Size(40, 23);
			this.label6.TabIndex = 17;
			this.label6.Text = "学号";
			this.label6.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
			// 
			// StuInfo
			// 
			this.StuInfo.Location = new System.Drawing.Point(56, 200);
			this.StuInfo.Name = "StuInfo";
			this.StuInfo.Size = new System.Drawing.Size(88, 23);
			this.StuInfo.TabIndex = 16;
			this.StuInfo.Text = "添  加";
			this.StuInfo.Click += new System.EventHandler(this.StuInfo_Click);
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(152, 200);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(88, 23);
			this.button1.TabIndex = 25;
			this.button1.Text = "退  出";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// AddStu
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(292, 266);
			this.Controls.Add(this.button1);
			this.Controls.Add(this.textBox9);
			this.Controls.Add(this.textBox8);
			this.Controls.Add(this.textBox6);
			this.Controls.Add(this.textBox5);
			this.Controls.Add(this.label10);
			this.Controls.Add(this.label9);
			this.Controls.Add(this.label7);
			this.Controls.Add(this.label6);
			this.Controls.Add(this.StuInfo);
			this.Name = "AddStu";
			this.Text = "添加学生信息";
			this.ResumeLayout(false);

		}
		#endregion

		private void StuInfo_Click(object sender, System.EventArgs e)
		{
			string Stu_Number;
			string Stu_Name;
			int Stu_Age;
			int Dep_Number;

			//判断必须输入的信息已输入之后在给变量赋值
			if( (textBox5.Text!="") && (textBox6.Text!="") && (textBox8.Text!="") &&(textBox9.Text!=""))
			{
				Stu_Number = textBox5.Text;
				Stu_Name = textBox6.Text;
				Stu_Age = Int32.Parse(textBox8.Text);
				Dep_Number = Int32.Parse(textBox9.Text);
			}
			else
			{
				MessageBox.Show("请输入完整的信息！");
				return;
			}
			
			string check = String.Format("select Dep_Number from Department where Dep_Number={0}", Dep_Number);
			string sql = String.Format("insert into Students (Stu_Number,Stu_Name,Stu_Age,Dep_Number) values ('{0}','{1}',{2},{3})",Stu_Number,Stu_Name,Stu_Age,Dep_Number);

			SqlConnection sqlcnn = new SqlConnection( connectstr );
			try
			{
				sqlcnn.Open();
				SqlCommand cmd = new SqlCommand(check, sqlcnn);
				//查询Dep_Number表中是否存在当前要录入的学生所在的学院
				SqlDataReader MyDataReader = cmd.ExecuteReader();				
				if ( !MyDataReader.Read() )
				{
					MessageBox.Show("目前还没有这个学院！");
					MyDataReader.Close();
					sqlcnn.Close();
					return;
				}
				MyDataReader.Close();

				SqlCommand cmd1 = new SqlCommand(sql, sqlcnn);
				//执行插入操作，并返回受影响的行数
				int j = cmd1.ExecuteNonQuery();
				//如果受影响的行数小于一则说明操作失败了
				if ( j<1 )
				{
					MessageBox.Show("操作失败！");
					sqlcnn.Close();
				}
				sqlcnn.Close();
			}
			catch(Exception er)
			{
				string temp = er.Message.ToString();
				sqlcnn.Close();
				return;
			}
			MessageBox.Show("录入成功！");
		}

		private void button1_Click(object sender, System.EventArgs e)
		{
			this.Close();
		}
	}
}