在vs.net bate 2中的ado.net简单编程(傻瓜版)

    技术2022-05-11  135

         这篇文章只适合初学者,如果你是大虾,这篇文章就是浪费你的时间。

    首先,文件->兴建->项目。项目类型:C#,ASP。NET应用程序。

    在工具箱中拖一个sqldataadapter到webform窗口中。

    向导先点下一步,新建连接,在连接标签下,选取一个可用的服务器和可用的sqlserver数据库,确定。

    然后配置查询生成器(太简单就不说了)。完成。

    在webform中点击sqldataadapter1在属性栏的下面点生成数据集。单选框用新建,确定。

    至此,和数据库的连接工作基本搞定了,让我们来操作它吧。

    拖一个datagrid到webform 窗口。属性生成器中选好数据源(我们只有一个dataset)也就这样了。

    然后我们来看看代码。

    切换到代码窗口,添加黄色的代码:

    using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;

    namespace WebApplication1{ /// <summary> /// Summary description for WebForm1. /// </summary> public class WebForm1 : System.Web.UI.Page {  protected System.Data.SqlClient.SqlDataAdapter sqlDataAdapter1;  protected System.Data.SqlClient.SqlCommand sqlSelectCommand1;  protected System.Data.SqlClient.SqlCommand sqlInsertCommand1;  protected System.Data.SqlClient.SqlConnection sqlConnection1;  protected System.Web.UI.WebControls.DataGrid DataGrid1;  protected System.Web.UI.WebControls.Button Button1;  protected System.Data.SqlClient.SqlDataAdapter sqlDataAdapter2;  protected System.Data.SqlClient.SqlCommand sqlSelectCommand2;  protected System.Data.SqlClient.SqlCommand sqlInsertCommand2;  protected System.Data.SqlClient.SqlCommand sqlUpdateCommand1;  protected System.Data.SqlClient.SqlCommand sqlDeleteCommand1;  protected System.Data.SqlClient.SqlConnection sqlConnection2;  protected System.Web.UI.WebControls.DataGrid DataGrid2;  protected WebApplication1.DataSet1 dataSet11;   public WebForm1()  {   Page.Init += new System.EventHandler(Page_Init);  }

      private void Page_Load(object sender, System.EventArgs e)  {   // Put user code to initialize the page here  }

      private void Page_Init(object sender, EventArgs e)  {   //   // CODEGEN: This call is required by the ASP.NET Web Form Designer.   //   InitializeComponent(); //填充数据集    

     sqlDataAdapter1.Fill (dataSet11);

    //绑定   DataGrid1.DataBind ();     } #region Web Form Designer generated code  /// <summary>  /// Required method for Designer support - do not modify  /// the contents of this method with the code editor.  /// </summary>  private void InitializeComponent()  #endregion

      }

    生成程序,如果正常的话你应该可以在datagrid看到你的数据了。

    如果你对操作的数据有更高的要求的话(前提是会sql语句),你可以点饥前面绿色代码前的小加号,修改下面的兰色代码。  private void InitializeComponent()  {       this.sqlConnection1 = new System.Data.SqlClient.SqlConnection();   this.dataSet11 = new WebApplication1.DataSet1();   this.sqlInsertCommand1 = new System.Data.SqlClient.SqlCommand();   this.sqlSelectCommand1 = new System.Data.SqlClient.SqlCommand();   this.sqlDataAdapter1 = new System.Data.SqlClient.SqlDataAdapter();   this.sqlDataAdapter2 = new System.Data.SqlClient.SqlDataAdapter();   this.sqlSelectCommand2 = new System.Data.SqlClient.SqlCommand();   this.sqlInsertCommand2 = new System.Data.SqlClient.SqlCommand();   this.sqlUpdateCommand1 = new System.Data.SqlClient.SqlCommand();   this.sqlDeleteCommand1 = new System.Data.SqlClient.SqlCommand();   this.sqlConnection2 = new System.Data.SqlClient.SqlConnection();   ((System.ComponentModel.ISupportInitialize)(this.dataSet11)).BeginInit();   this.Button1.Click += new System.EventHandler(this.Button1_Click);   //    // sqlConnection1   //    this.sqlConnection1.ConnectionString = "data source=(local);initial catalog=xr;integrated security=SSPI;persist security " +    "info=False;workstation id=XURUI;packet size=4096";   //    // dataSet11   //    this.dataSet11.DataSetName = "DataSet1";   this.dataSet11.Locale = new System.Globalization.CultureInfo("zh-CN");   this.dataSet11.Namespace = "http://www.tempuri.org/DataSet1.xsd";   //    // sqlInsertCommand1   //    this.sqlInsertCommand1.CommandText = "INSERT INTO store(zipcode, area, name) VALUES (@zipcode, @area, @name); SELECT zi" +    "pcode, area, name FROM store";   this.sqlInsertCommand1.Connection = this.sqlConnection1;   this.sqlInsertCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@zipcode", System.Data.SqlDbType.Char, 10, System.Data.ParameterDirection.Input, true, ((System.Byte)(0)), ((System.Byte)(0)), "zipcode", System.Data.DataRowVersion.Current, null));   this.sqlInsertCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@area", System.Data.SqlDbType.Char, 10, System.Data.ParameterDirection.Input, true, ((System.Byte)(0)), ((System.Byte)(0)), "area", System.Data.DataRowVersion.Current, null));   this.sqlInsertCommand1.Parameters.Add(new System.Data.SqlClient.SqlParameter("@name", System.Data.SqlDbType.Char, 10, System.Data.ParameterDirection.Input, true, ((System.Byte)(0)), ((System.Byte)(0)), "name", System.Data.DataRowVersion.Current, null));   //    // sqlSelectCommand1   //    this.sqlSelectCommand1.CommandText = "SELECT zipcode, area, name FROM store ";   this.sqlSelectCommand1.Connection = this.sqlConnection1;   //    // sqlDataAdapter1   //    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", "store", new System.Data.Common.DataColumnMapping[] {....................................

    ...........................

    你可以根据自己的需要生成数据集。

    加入新列你可以这样做:

       DataTable dt;//定义一个表(废话)   dt=dataSet11.Tables ["你的表"];//给表付值

       DataRow dr;   dr=dt.NewRow ();//新元组   dr.BeginEdit ();    dr["属性1"]=  ;

    dr["属性2"]=;

    dr["属性3"]=;

           dr.EndEdit ();   dt.Rows.Add (dr);//加入元组      DataGrid1.DataBind ();//把改变在datagrid中表示出来,不写也可以但是没现象了。                  修改的代码:

    dr= tblAuthors.Rows.Find("213-46-8915");//找到元组(缺省为找主码)dr.BeginEdit();dr["属性1"] = "342" ;

     dr("属性2")=“2342”;

    dr.EndEdit()

    删除代码:

    drCurrent = tblAuthors.Rows.Find("993-21-3427");drCurrent.Delete();

    以上的操作只是对数据集 如果你要把改变保存回数据库还要添一句:

    sqlDataAdapter1.Update (dataSet11,"store");

    我的文章就此为止。

    由于做设计的缘故,我现在对ADO. net很有兴趣,如果有人想讨论,email:

    xurui_@hotmail.com


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