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在vs.net bate 2中的ado.net简单编程(傻瓜版)

2024-07-10 13:02:50
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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。

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