form_modifyitem.cs

本人的总结

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

namespace 数据库更新
{
	/// <summary>
	/// Form_ModifyItem 的摘要说明。
	/// </summary>
	public class Form_ModifyItem : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Button button3;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.TextBox textBox2;
		private System.Windows.Forms.TextBox textBox1;
		private System.Data.SqlClient.SqlDataAdapter sqlDataAdapter1;
		private System.Data.SqlClient.SqlCommand sqlSelectCommand1;
		private System.Data.SqlClient.SqlCommand sqlInsertCommand1;
		private System.Data.SqlClient.SqlCommand sqlUpdateCommand1;
		private System.Data.SqlClient.SqlCommand sqlDeleteCommand1;
		private System.Data.SqlClient.SqlConnection sqlConnection1;
		private 数据库更新.DataSet_ModifyItem dataSet_ModifyItem1;
		private System.Windows.Forms.Button button4;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form_ModifyItem()
		{
			//
			// 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.button3 = new System.Windows.Forms.Button();
			this.button2 = new System.Windows.Forms.Button();
			this.button1 = new System.Windows.Forms.Button();
			this.textBox2 = new System.Windows.Forms.TextBox();
			this.textBox1 = new System.Windows.Forms.TextBox();
			this.sqlDataAdapter1 = new System.Data.SqlClient.SqlDataAdapter();
			this.sqlDeleteCommand1 = new System.Data.SqlClient.SqlCommand();
			this.sqlConnection1 = new System.Data.SqlClient.SqlConnection();
			this.sqlInsertCommand1 = new System.Data.SqlClient.SqlCommand();
			this.sqlSelectCommand1 = new System.Data.SqlClient.SqlCommand();
			this.sqlUpdateCommand1 = new System.Data.SqlClient.SqlCommand();
			this.dataSet_ModifyItem1 = new 数据库更新.DataSet_ModifyItem();
			this.button4 = new System.Windows.Forms.Button();
			((System.ComponentModel.ISupportInitialize)(this.dataSet_ModifyItem1)).BeginInit();
			this.SuspendLayout();
			// 
			// label1
			// 
			this.label1.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.label1.Location = new System.Drawing.Point(40, 16);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(216, 23);
			this.label1.TabIndex = 11;
			this.label1.Text = "修改数据库中的一个记录";
			this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
			// 
			// button3
			// 
			this.button3.Location = new System.Drawing.Point(38, 200);
			this.button3.Name = "button3";
			this.button3.Size = new System.Drawing.Size(224, 23);
			this.button3.TabIndex = 10;
			this.button3.Text = "利用数据集更新数据库（工具箱控件）";
			this.button3.Click += new System.EventHandler(this.button3_Click);
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(38, 168);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(224, 23);
			this.button2.TabIndex = 9;
			this.button2.Text = "利用数据集更新数据库（手工代码）";
			this.button2.Click += new System.EventHandler(this.button2_Click);
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(38, 136);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(224, 23);
			this.button1.TabIndex = 8;
			this.button1.Text = "利用SQL语句更新数据库";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// textBox2
			// 
			this.textBox2.Location = new System.Drawing.Point(38, 88);
			this.textBox2.Name = "textBox2";
			this.textBox2.Size = new System.Drawing.Size(224, 21);
			this.textBox2.TabIndex = 7;
			this.textBox2.Text = "请输入类别描述（可以为空）";
			this.textBox2.MouseDown += new System.Windows.Forms.MouseEventHandler(this.textBox2_MouseDown);
			// 
			// textBox1
			// 
			this.textBox1.Location = new System.Drawing.Point(38, 48);
			this.textBox1.Name = "textBox1";
			this.textBox1.Size = new System.Drawing.Size(224, 21);
			this.textBox1.TabIndex = 6;
			this.textBox1.Text = "请输入类别名称(不能为空)";
			this.textBox1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.textBox1_MouseDown);
			// 
			// sqlDataAdapter1
			// 
			this.sqlDataAdapter1.DeleteCommand = this.sqlDeleteCommand1;
			this.sqlDataAdapter1.InsertCommand = this.sqlInsertCommand1;
			this.sqlDataAdapter1.SelectCommand = this.sqlSelectCommand1;
			this.sqlDataAdapter1.TableMappings.AddRange(new System.Data.Common.DataTableMapping[] {
																									  new System.Data.Common.DataTableMapping("Table", "Categories", new System.Data.Common.DataColumnMapping[] {
																																																					new System.Data.Common.DataColumnMapping("CategoryName", "CategoryName"),
																																																					new System.Data.Common.DataColumnMapping("Description", "Description"),
																																																					new System.Data.Common.DataColumnMapping("CategoryID", "CategoryID")})});
			this.sqlDataAdapter1.UpdateCommand = this.sqlUpdateCommand1;
			// 
			// sqlDeleteCommand1
			// 
			this.sqlDeleteCommand1.CommandText = "DELETE FROM Categories WHERE (CategoryID = @Original_CategoryID) AND (CategoryNam" +
				"e = @Original_CategoryName)";
			this.sqlDeleteCommand1.Connection = this.sqlConnection1;
			this.sqlDeleteCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@Original_CategoryID", System.Data.SqlDbType.Int, 4, System.Data.ParameterDirection.Input, false, ((System.Byte)(0)), ((System.Byte)(0)), "CategoryID", System.Data.DataRowVersion.Original, null));
			this.sqlDeleteCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@Original_CategoryName", System.Data.SqlDbType.NVarChar, 15, System.Data.ParameterDirection.Input, false, ((System.Byte)(0)), ((System.Byte)(0)), "CategoryName", System.Data.DataRowVersion.Original, null));
			// 
			// sqlConnection1
			// 
			this.sqlConnection1.ConnectionString = "workstation id=HZX;packet size=4096;integrated security=SSPI;initial catalog=Nort" +
				"hwind;persist security info=False";
			// 
			// sqlInsertCommand1
			// 
			this.sqlInsertCommand1.CommandText = "INSERT INTO Categories(CategoryName, Description) VALUES (@CategoryName, @Descrip" +
				"tion); SELECT CategoryName, Description, CategoryID FROM Categories WHERE (Categ" +
				"oryID = @@IDENTITY)";
			this.sqlInsertCommand1.Connection = this.sqlConnection1;
			this.sqlInsertCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@CategoryName", System.Data.SqlDbType.NVarChar, 15, "CategoryName"));
			this.sqlInsertCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@Description", System.Data.SqlDbType.NVarChar, 1073741823, "Description"));
			// 
			// sqlSelectCommand1
			// 
			this.sqlSelectCommand1.CommandText = "SELECT CategoryName, Description, CategoryID FROM Categories WHERE (CategoryID = " +
				"9)";
			this.sqlSelectCommand1.Connection = this.sqlConnection1;
			// 
			// sqlUpdateCommand1
			// 
			this.sqlUpdateCommand1.CommandText = @"UPDATE Categories SET CategoryName = @CategoryName, Description = @Description WHERE (CategoryID = @Original_CategoryID) AND (CategoryName = @Original_CategoryName); SELECT CategoryName, Description, CategoryID FROM Categories WHERE (CategoryID = @CategoryID)";
			this.sqlUpdateCommand1.Connection = this.sqlConnection1;
			this.sqlUpdateCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@CategoryName", System.Data.SqlDbType.NVarChar, 15, "CategoryName"));
			this.sqlUpdateCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@Description", System.Data.SqlDbType.NVarChar, 1073741823, "Description"));
			this.sqlUpdateCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@Original_CategoryID", System.Data.SqlDbType.Int, 4, System.Data.ParameterDirection.Input, false, ((System.Byte)(0)), ((System.Byte)(0)), "CategoryID", System.Data.DataRowVersion.Original, null));
			this.sqlUpdateCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@Original_CategoryName", System.Data.SqlDbType.NVarChar, 15, System.Data.ParameterDirection.Input, false, ((System.Byte)(0)), ((System.Byte)(0)), "CategoryName", System.Data.DataRowVersion.Original, null));
			this.sqlUpdateCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@CategoryID", System.Data.SqlDbType.Int, 4, "CategoryID"));
			// 
			// dataSet_ModifyItem1
			// 
			this.dataSet_ModifyItem1.DataSetName = "DataSet_ModifyItem";
			this.dataSet_ModifyItem1.Locale = new System.Globalization.CultureInfo("zh-CN");
			// 
			// button4
			// 
			this.button4.Location = new System.Drawing.Point(104, 232);
			this.button4.Name = "button4";
			this.button4.TabIndex = 12;
			this.button4.Text = "返回";
			this.button4.Click += new System.EventHandler(this.button4_Click);
			// 
			// Form_ModifyItem
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(292, 262);
			this.Controls.Add(this.button4);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.button3);
			this.Controls.Add(this.button2);
			this.Controls.Add(this.button1);
			this.Controls.Add(this.textBox2);
			this.Controls.Add(this.textBox1);
			this.Name = "Form_ModifyItem";
			this.Text = "Form_ModifyItem";
			((System.ComponentModel.ISupportInitialize)(this.dataSet_ModifyItem1)).EndInit();
			this.ResumeLayout(false);

		}
		#endregion

		private void button1_Click(object sender, System.EventArgs e)
		{
			SqlConnection connection = new SqlConnection();
			SqlCommand command = new SqlCommand();

			connection.ConnectionString = "workstation id=localhost;packet size=4096;integrated security=SSPI;initial catalog=Northwind;persist security info=False";
			command.Connection = connection;
			connection.Open();
			command.CommandText = "UPDATE Categories SET CategoryName = '" + this.textBox1.Text + "'," + "Description = '" + this.textBox2.Text + "' WHERE CategoryID=9";
			try
			{
				command.ExecuteNonQuery();
				MessageBox.Show("数据库记录修改成功","修改记录");
			}
			catch(SqlException x)
			{
				MessageBox.Show("数据库记录修改失败","修改记录");
			}
			connection.Close();
		}

		private void button2_Click(object sender, System.EventArgs e)
		{
			SqlDataAdapter adapter = new SqlDataAdapter();
			SqlConnection connection = new SqlConnection();
			SqlCommand command = new SqlCommand();
			DataSet ds = new DataSet();
			DataTable table = new DataTable();
			SqlCommandBuilder scb = new SqlCommandBuilder(adapter);

			connection.ConnectionString = "workstation id=localhost;packet size=4096;integrated security=SSPI;initial catalog=Northwind;persist security info=False";
			command.CommandText = "SELECT * FROM Categories WHERE CategoryID=9";
			command.Connection = connection;
			connection.Open();

			adapter.SelectCommand = command;
			adapter.Fill(ds,"Categories");
			table = ds.Tables["Categories"];

			DataRow row = table.Rows[0];
			row["CategoryName"] = this.textBox1.Text;
			row["Description"] = this.textBox2.Text;
			try
			{
				adapter.Update(ds,"Categories");
				MessageBox.Show("数据库记录修改成功","修改记录");
			}
			catch(SqlException x)
			{
				MessageBox.Show("数据库记录修改失败","修改记录");
			}
			connection.Close();
		}

		private void textBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			this.textBox1.Text = "";
		}

		private void textBox2_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			this.textBox2.Text = "";
		}

		private void button3_Click(object sender, System.EventArgs e)
		{
			this.sqlConnection1.Open();
			this.sqlDataAdapter1.SelectCommand = this.sqlSelectCommand1;
			this.sqlSelectCommand1.Connection = this.sqlConnection1;
			this.sqlDataAdapter1.Fill(this.dataSet_ModifyItem1,"Categories");

			DataTable table = this.dataSet_ModifyItem1.Tables["Categories"];
			DataRow row = table.Rows[0];
			row["CategoryName"] = this.textBox1.Text;
			row["Description"] = this.textBox2.Text;
			try
			{
				this.sqlDataAdapter1.Update(this.dataSet_ModifyItem1,"Categories");
				MessageBox.Show("数据库记录修改成功","修改记录");
			}
			catch(SqlException x)
			{
				MessageBox.Show("数据库记录修改失败","修改记录");
			}
			this.sqlConnection1.Close();
		}

		private void button4_Click(object sender, System.EventArgs e)
		{
			new Form1().Show();
			this.Dispose();
		}
	}
}