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温故而知新，WebConfig数据库配置及页面的调用

2008-02-21 17:30 447 查看

一、SQLServer2000数据库的配置和页面调用

<?xml version="1.0" encoding="big5" ?>

</appSettings>

Private Sub Button1_Click()Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim str, sql As String

Dim conn As SqlConnection

Dim da As SqlDataAdapter

Dim ds As New DataSet

Dim dv As DataView

If txt1.Text = "" Or txt2.Text = "" Then

Response.Write("<script language=javascript>alert('用戶名或密碼為空！');</script>")

Else

str = ConfigurationSettings.AppSettings("connstr")

conn = New SqlConnection(str)

sql = "select * from usertable where design_worknum='" + txt1.Text + "'"

da = New SqlDataAdapter(sql, conn)

da.Fill(ds, "tables")

dv = ds.Tables("tables").DefaultView

If dv.Count - 1 >= 0 Then

Session("password") = ds.Tables("tables").Rows(0).Item(3).ToString

If Session("password") = txt2.Text Then

Session("headship") = ds.Tables("tables").Rows(0).Item(4).ToString

Session("names") = ds.Tables("tables").Rows(0).Item(0).ToString

Session("partment") = ds.Tables("tables").Rows(0).Item(2).ToString

Session("worknum") = ds.Tables("tables").Rows(0).Item(1).ToString

Session("computerIP") = ds.Tables("tables").Rows(0).Item(5).ToString

Session("group") = ds.Tables("tables").Rows(0).Item(7).ToString

lab1.Text = Session("names")

lab2.Text = Session("worknum")

lab3.Text = Session("headship")

Panel1.Visible = False

panel2.Visible = True

txt1.Text = ""

End If

End Sub

二、oracle数据库webconfig配置及页面调用示例

<?xml version="1.0" encoding="utf-8"?>

</appSettings>

<system.web>

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;

using System.Data.OracleClient ;

namespace eElectrode

...{

/**//// <summary>

/// Summary description for LoginForm.

/// </summary>

public class LoginForm : System.Web.UI.Page

...{

protected System.Web.UI.WebControls.ImageButton btnConfirm;

protected System.Web.UI.WebControls.TextBox txtPassword;

protected System.Web.UI.WebControls.TextBox txtUser;

private string connString = string.Empty;

private OracleConnection conn = new OracleConnection();

private void Page_Load(object sender, System.EventArgs e)

...{

Response.Expires = -1;

connString = System.Configuration.ConfigurationSettings.AppSettings["ConnString"].ToString();

conn.ConnectionString = connString;

Session.RemoveAll();

}

private void CheckUser()

...{

if (txtUser.Text.Length <1)

...{

Response.Write("<script language='javascript'>alert('用戶名不允許為空!')</script>");

return;

}

try

...{

conn.Open();

OracleCommand cmd = new OracleCommand();

cmd.Connection = conn;

string selString = "Select * from UserInformation where UserId = '" + txtUser.Text + "' and Password = '" + txtPassword.Text + "'";

cmd.CommandText = selString;

OracleDataReader dr = cmd.ExecuteReader();

if (dr.HasRows)

...{

while (dr.Read())

...{

Session.Remove("UserId");

Session.Remove("GroupName");

Session.Remove("UserType");

Session.Add("UserId",dr["UserId"].ToString());

HttpCookie cook = new HttpCookie("UserId",dr["UserId"].ToString());

Response.Cookies.Add(cook);

Session.Add("GroupName",dr["GroupName"].ToString());

HttpCookie cook1 = new HttpCookie("GroupName",dr["GroupName"].ToString());

Response.Cookies.Add(cook1);

Session.Add("UserType",dr["UserType"].ToString());

HttpCookie cook2 = new HttpCookie("UserType",dr["UserType"].ToString());

Response.Cookies.Add(cook2);

}

dr.Close();

string updateString = "Update UserInformation set LastLoginDate = sysdate where UserId = '" + txtUser.Text + "'";

cmd.CommandText = updateString;

cmd.ExecuteNonQuery();

updateString = "Insert into LOGIN_LOG(USERNAME,LOGTYPE,LOGTIME)" +

" values('" + txtUser.Text + "','IN',sysdate)";

cmd.CommandText = updateString;

cmd.ExecuteNonQuery();

Response.Write("<script language='javascript'>window.location = 'Default.htm';</script>");

}

else

...{

Response.Write("<script language='javascript'>alert('用戶名或密碼不正確,請重新輸入!')</script>");

txtUser.Text = "";

txtPassword.Text = "";

dr.Close();

conn.Close();

return;

}

catch (System.Exception ex)

...{

Response.Write("<script language='javascript'>alert('"+ex.Message+"')</script>");

}

finally

...{

conn.Close();

}

private void btnConfirm_Click(object sender, System.Web.UI.ImageClickEventArgs e)

...{

CheckUser();

}

三、oracle數據庫webconfig調用的另一個配置和頁面調用，因此方法是微軟退出的一個跟數據庫類型無關的鏈接方式，故需要在Bin目錄文件夾中加載微軟的相應Dll文件，此處欠奉。

<?xml version="1.0"?>

<!--

注意: 除了手动编辑此文件以外，您还可以使用

Web 管理工具来配置应用程序的设置。可以使用 Visual Studio 中的

“网站”->“Asp.Net 配置”选项。

设置和注释的完整列表在

machine.config.comments 中，该文件通常位于

WindowsMicrosoft.NetFrameworkv2.xConfig 中

-->

</configSections>

</appSettings>

</connectionStrings>

<system.web>

using System;

using System.Data;

using System.Configuration;

using System.Collections;

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;

using Microsoft.Practices.EnterpriseLibrary.Data;

using Microsoft.Practices.EnterpriseLibrary.Common;

using Microsoft.Practices.EnterpriseLibrary.Configuration;

using System.Data.Common;

public partial class Login : System.Web.UI.Page

...{

protected void Page_Load(object sender, EventArgs e)

...{

Session.RemoveAll();

}

private void CheckUser()

...{

if (txtUser.Text.Length < 1)

...{

Response.Write("<script language='javascript'>alert('用戶名不允許為空!')</script>");

return;

}

try

...{

Database db = DatabaseFactory.CreateDatabase();

string selString = "Select * from USERINFORMATION where USERID = '" + Helper.LoginLetterSelected(txtUser.Text) + "' and Password = '" + Helper.LoginLetterSelected(txtPassword.Text) + "'";

DbCommand selCmd = db.GetSqlStringCommand(selString);

IDataReader selDr = db.ExecuteReader(selCmd);

if (selDr.Read())

...{

Session.Remove("UserId");

Session.Remove("UserName");

Session.Remove("GroupName");

Session.Remove("UserType");

Session.Add("UserName", selDr["USERNAME"].ToString());

HttpCookie cook3 = new HttpCookie("UserName", selDr["USERNAME"].ToString());

cook3.Expires = DateTime.Now.AddDays(10);

Response.Cookies.Add(cook3);

Session.Add("UserId", selDr["UserId"].ToString());

HttpCookie cook = new HttpCookie("UserId", selDr["UserId"].ToString());

cook.Expires = DateTime.Now.AddDays(10);

Response.Cookies.Add(cook);

Session.Add("GroupName", selDr["GroupName"].ToString());

HttpCookie cook1 = new HttpCookie("GroupName", selDr["GroupName"].ToString());

cook1.Expires = DateTime.Now.AddDays(10);

Response.Cookies.Add(cook1);

Session.Add("UserType", selDr["UserType"].ToString());

HttpCookie cook2 = new HttpCookie("UserType", selDr["UserType"].ToString());

cook2.Expires = DateTime.Now.AddDays(10);

Response.Cookies.Add(cook2);

selDr.Close();

string updateString = "Update USERINFORMATION set LastLoginDate = sysdate where UserId = '" + txtUser.Text + "'";

selCmd.CommandText = updateString;

db.ExecuteNonQuery(selCmd);

Session["url"] = Request.QueryString["url"];

Response.Write("<script language='javascript'>window.location = 'Default.htm';</script>");

}

else

...{

Response.Write("<script language='javascript'>alert('用戶名或密碼不正確,請重新輸入!')</script>");

txtUser.Text = "";

selDr.Close();

return;

}

catch (System.Exception ex)

...{

Response.Write("<script language='javascript'>alert('" + ex.Message + "')</script>");

}

protected void ImageButton1_Click(object sender, ImageClickEventArgs e)

...{

CheckUser();

}

}

四、oracle中不使用webconfig連接數據庫，而是直接把連接語句寫到一個類里，然後調用的方法

using System;

using System.Data;

using System.Configuration;

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;

using System.Data.OracleClient;

using System.Data.Common;

/**//// <summary>

/// 創建數據庫聯接、執行存儲過程

/// </summary>

public class DB

...{

public DB()

...{

// TODO: 在此处添加构造函数逻辑

}

public static OracleConnection Oraconn()

...{

return new OracleConnection("user id=test;data source=DBA_192.168.0.1;password=test;Pooling=true;Min Pool Size=0;Max Pool Size=200;");

}

/**////<summary>

///名稱：CreatCommand

///描述：創建一個OracleCommand對象來執行存儲過程。

///</summary>

///<param name="procName">存儲過程名稱</param>

///<param name="prams">存儲過程所需要的參數</param>

///<returns>返回sqlcommand對象></returns>

public OracleCommand CreateCommand(string procName, OracleParameter[] prams)

...{

OracleConnection oraconn = DB.Oraconn();

oraconn.Open();

OracleCommand cmd = new OracleCommand(procName,oraconn);

cmd.CommandType = CommandType.StoredProcedure;

if (prams != null)

...{

foreach (OracleParameter parameter in prams)

...{

cmd.Parameters.Add(parameter);

}

return cmd;

}

五、c#連接Access

using System.Data;

using System.Data.OleDb;

string strConnection="Provider=Microsoft.Jet.OleDb.4.0;";strConnection+=@"DataSource=C:BegASPNETNorthwind.mdb";

OleDbConnection objConnection=new OleDbConnection(strConnection);

objConnection.Open();

...

objConnection.Close();

解释：

连接Access数据库需要导入额外的命名空间，所以有了最前面的两条using命令，这是必不可少的!

strConnection这个变量里存放的是连接数据库所需要的连接字符串，他指定了要使用的数据提供者和要使用的数据源。

“Provider=Microsoft.Jet.OleDb.4.0;”是指数据提供者，这里使用的是Microsoft Jet引擎，也就是Access中的数据引擎，asp.net就是靠这个和Access的数据库连接的。

“Data Source=C:/BegASPNET/Northwind.mdb”是指明数据源的位置，他的标准形式是“Data Source=MyDrive:MyPath/MyFile.MDB”。

PS:
1.“+=”后面的“@”符号是防止将后面字符串中的“/”解析为转义字符。
2.如果要连接的数据库文件和当前文件在同一个目录下，还可以使用如下的方法连接：

strConnection+="Data Source=";

strConnection+=MapPath("Northwind.mdb");

3.要注意连接字符串中的参数之间要用分号来分隔。

“OleDbConnection objConnection=new OleDbConnection(strConnection);”这一句是利用定义好的连接字符串来建立了一个链接对象，以后对数据库的操作我们都要和这个对象打交道。

“objConnection.Open();”这用来打开连接。至此，与Access数据库的连接完成。

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