对于网站编程的初学者来说，总是会上网找些源码来看，但久而久之还是停留在改代码的阶段，并不明白怎样去写一个完整的网站程序．有见如此我就开始写这样的文章（c#版），不足之处请批评指正．

数据库连接篇

在WEB项目里看到Web.config配置文件，在configuration这行加入下面代码用于和SQL服务器进行连接

<appSettings> <!-- 数据库连接字符串 --> <add key="ConnStr" value="Data Source=localhost;database=company;UID=sa;Password=;Persist Security Info=True;" /> </appSettings>

数据列表显示篇，如图：

using System; using System.Data; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls;

//引用命名空间:SQL托管,配置文件 using System.Data.SqlClient; using System.Configuration;

public partial class _Default : System.Web.UI.Page {protected SqlConnection myconn = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]);//读取web.config配置文件中的数据库连接字符串,并连接到指定的数据库

protected void Page_Load(object sender, EventArgs e){if(!IsPostBack)//判断页面是否第一次运行{

string strsql="select * from Product";//定义一个数据库的查询字符串DataSet ds = new DataSet();myconn.Open();//打开数据库连接SqlDataAdapter command = new SqlDataAdapter(strsql,myconn);//表示用于填充DataSet 和更新SQL Server 数据库的一组数据命令和一个数据库连接command.Fill(ds, "Product");productList.DataSource = ds.Tables[0].DefaultView;productList.DataBind();ds.Clear();myconn.Close();//关闭数据库连接}}

protected void grid_ItemDataBound(object sender, DataGridItemEventArgs e){foreach (System.Web.UI.WebControls.HyperLink link in e.Item.Cells[7].Controls){link.Attributes.Add("onClick", "if (!window.confirm('您真的要删除这条记录吗？')){return false;}");}}

}

数据添加篇

protected void btnAdd_Click(object sender, EventArgs e){string ProductId = this.txtProductId.Text;string CategoryId = this.txtCategoryId.Text;string Name = this.txtName.Text;string Description = this.txtDescription.Text;string Price =this.txtPrice.Text;

string sql_Exeits = "select * from Product where ProductId='" + ProductId + "'";SqlCommand cmd_Exeits = new SqlCommand(sql_Exeits, myconn);myconn.Open();SqlDataReader rdr = cmd_Exeits.ExecuteReader();while (rdr.Read()){Response.Write("<script language='JavaScript'>");Response.Write("alert('对不起，该产品编号已经存在！')");Response.Write("</script>");this.txtCategoryId.Text = "";this.txtDescription.Text = "";this.txtName.Text = "";this.txtPrice.Text = "";this.txtProductId.Text = "";return;}rdr.Close();

string sql_add = "insert into Product(ProductId,CategoryId,Name,Description,Price)values('" + ProductId + "','" + CategoryId + "','" + Name + "','" + Description + "','" + Price + "')";SqlCommand cmd_add = new SqlCommand(sql_add, myconn);//SqlCommand:表示要对SQL Server数据库执行的一个Transact-SQL语句或存储过程cmd_add.ExecuteNonQuery();//对连接执行Transact-SQL语句并返回受影响的行数。对于 UPDATE、INSERT 和 DELETE 语句，返回值为该命令所影响的行数。对于所有其他类型的语句，返回值为 -1。如果发生回滚，返回值也为 -1。myconn.Dispose();myconn.Close();} [/CODE

[COLOR=Red]数据显示篇[/COLOR] [CODE] protected void Page_Load(object sender, EventArgs e){if (!IsPostBack){string id = Request.Params["id"];if (id == null || id.Trim() == ""){Response.Redirect("default.aspx");Response.End();}else{string sql_show = "select * from Product Where ProductId=" + id;SqlCommand cmd_show = new SqlCommand(sql_show, conn);conn.Open();SqlDataReader rd_show = cmd_show.ExecuteReader();//使用SqlDataReader对象读取并返回一个记录集shows.DataSource = rd_show;//指向数据源shows.DataBind();//绑定数据rd_show.Close();//关闭SqlDataReader}}}

数据修改篇

protected void btnAdd_Click(object sender, EventArgs e){string ProductId = this.lblProductId.Text;string CategoryId = this.txtCategoryId.Text;string Name = this.txtName.Text;string Description = this.txtDescription.Text;decimal Price = decimal.Parse(this.txtPrice.Text);

string sql_edit = "update Product set CategoryId='" + CategoryId + "',Name='" + Name + "',Description='" + Description + "',Price='" + Price + "' where ProductId =" + ProductId;SqlCommand cmd_edit = new SqlCommand(sql_edit, conn);

conn.Open();cmd_edit.ExecuteNonQuery();conn.Close();Response.Write("<script language=javascript>window.alert('保存成功！')</script>");Response.Redirect("show.aspx?id=" + ProductId);}

数据删除篇

protected void Page_Load(object sender, EventArgs e){if (!Page.IsPostBack){string ProductId = Request.Params["id"];string sql_del = "delete from Product where ProductId=" + ProductId;SqlCommand cmd_del = new SqlCommand(sql_del, conn);conn.Open();cmd_del.ExecuteNonQuery();conn.Close();Response.Redirect("default.aspx");}}