如果樓主熟悉VB6,可以直接在項(xiàng)目中添加ADODB的Com引用,這樣你就可以像VB6那樣操作數(shù)據(jù)庫(kù)了!
網(wǎng)站建設(shè)哪家好,找創(chuàng)新互聯(lián)!專注于網(wǎng)頁(yè)設(shè)計(jì)、網(wǎng)站建設(shè)、微信開發(fā)、重慶小程序開發(fā)、集團(tuán)企業(yè)網(wǎng)站建設(shè)等服務(wù)項(xiàng)目。為回饋新老客戶創(chuàng)新互聯(lián)還提供了班瑪免費(fèi)建站歡迎大家使用!
另外
.NET Framework中連接數(shù)據(jù)庫(kù)要用到ADO.NET。如果要操作Access數(shù)據(jù)庫(kù),要用到System.Data.OleDb命名空間下的許多類。
比如按樓主所說,“我想在textbox1中顯示表一中【一些數(shù)據(jù)】字段下的第一個(gè)內(nèi)容”:
'首先導(dǎo)入命名空間
Imports System.Data
Imports System.Data.OleDb
'然后在某一個(gè)事件處理程序中寫:
Dim conn As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=數(shù)據(jù)庫(kù).accdb;Jet OLEDB:Database Password=MyDbPassword")
Dim command As New OleDbCommand("Select * From 數(shù)據(jù)表", conn)
conn.Open() '打開數(shù)據(jù)庫(kù)連接
Dim reader As OleDbDataReader = command.ExecuteReader() '執(zhí)行SQL語(yǔ)句,返回OleDbDataReader 對(duì)象
Do While reader.Read() '讀取一條數(shù)據(jù)
textbox1.Text += reader("一些數(shù)據(jù)") VbCrLf
Loop
reader.Close() '關(guān)閉OleDbDataReader
conn.Close() '關(guān)閉連接
引用Microsoft SQLDMO Object Library
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim SQLSER As New SQLDMO.SQLServer
SQLSER.Connect(ServerName, UserName, PassWord) '這三項(xiàng)換為你自己的
PBackup.Database = DatabaseName '數(shù)據(jù)庫(kù)名
Me.Cursor = System.Windows.Forms.Cursors.WaitCursor
Dim PathName As String
PathName = "D:\BackUp"
PBackup.Files = PathName
PBackup.SQLBackup(SQLSER)
SQLSER.DisConnect()
SQLSER = Nothing
Me.Cursor = System.Windows.Forms.Cursors.Default
MsgBox("成功備份了數(shù)據(jù)")
End Sub
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 System.IO;
using System.Text;
using _5dRss.Const;
using _5dRss.lib.Data.Tool;
public partial class admin_admin_dbmanage : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//生成備份文件列表
ListBackupFiles();
if (!Page.IsPostBack)
{
Showmsg.Visible = false;
//數(shù)據(jù)庫(kù)路徑
lilDBPath.Text = HttpContext.Current.Request.PhysicalApplicationPath + "App_Data\\" + ConfigurationSettings.AppSettings["DBFile"];
//新建一個(gè) FileInfo 對(duì)象,并獲得數(shù)據(jù)庫(kù)文件的大小,然后轉(zhuǎn)換單位為KB
FileInfo myFileInfo = new FileInfo(lilDBPath.Text);
lilDBSize.Text = Convert.ToString(myFileInfo.Length/1024) + " KB";
//如果兩個(gè)參數(shù)都不為空,則繼續(xù)執(zhí)行
if (Request.QueryString["cmd"] != null Request.QueryString["source"] != null)
{
//備份數(shù)據(jù)庫(kù)原文件名
string sourceFileName = Request.QueryString["source"];
//如果 cmd 參數(shù)為 DelFile
if (Request.QueryString["cmd"].Equals("DelFile"))
{
//刪除備份數(shù)據(jù)庫(kù)文件
File.Delete(HttpContext.Current.Request.PhysicalApplicationPath + "Backup\\" + sourceFileName);
//刷新備份文件列表
ListBackupFiles();
Showmsg.Visible = true;
Showmsg.Text = "div align='center' style='margin-bottom:8px;'img src='images/aL.gif' style='margin-bottom:-6px;'/span class='alertTxt'刪除備份數(shù)據(jù)庫(kù)成功!/spanimg src='images/aR.gif' style='margin-bottom:-6px;'//div";
}
//如果 cmd 參數(shù)為 Restore
if (Request.QueryString["cmd"].Equals("Restore"))
{
//用備份文件覆蓋原文件
File.Copy(HttpContext.Current.Request.PhysicalApplicationPath + "Backup\\" + sourceFileName, HttpContext.Current.Request.PhysicalApplicationPath + "App_Data\\" + ConfigurationSettings.AppSettings["DBFile"], true);
//刷新備份文件列表
ListBackupFiles();
Showmsg.Visible = true;
Showmsg.Text = "div align='center' style='margin-bottom:8px;'img src='images/aL.gif' style='margin-bottom:-6px;'/span class='alertTxt'還原備份數(shù)據(jù)庫(kù)成功!/spanimg src='images/aR.gif' style='margin-bottom:-6px;'//div";
}
}
}
}
protected void lnkbtnCompactDB_Click(object sender, EventArgs e)
{
//壓縮修復(fù)數(shù)據(jù)庫(kù)
AccessDBtool.CompactAccessDB(SysConfig.ConnectionString, HttpContext.Current.Request.PhysicalApplicationPath + "App_Data\\" + ConfigurationSettings.AppSettings["DBFile"]);
Showmsg.Visible = true;
Showmsg.Text = "div align='center' style='margin-bottom:8px;'img src='images/aL.gif' style='margin-bottom:-6px;'/span class='alertTxt'壓縮修復(fù)數(shù)據(jù)庫(kù)成功!/spanimg src='images/aR.gif' style='margin-bottom:-6px;'//div";
}
protected void lnkbtnBackupDB_Click(object sender, EventArgs e)
{
string sourceFileName = HttpContext.Current.Request.PhysicalApplicationPath + "App_Data\\" + ConfigurationSettings.AppSettings["DBFile"];
string destFileName = HttpContext.Current.Request.PhysicalApplicationPath + "Backup\\" + "Backup_";
destFileName += DateTime.Now.ToString("yyyyMMddHHmmss");
destFileName += ".mbk";
//將數(shù)據(jù)庫(kù)文件Copy到Backup目錄,如果有重名文件就覆蓋原文件
File.Copy(sourceFileName, destFileName, true);
//生成備份文件列表
ListBackupFiles();
Showmsg.Visible = true;
Showmsg.Text = "div align='center' style='margin-bottom:8px;'img src='images/aL.gif' style='margin-bottom:-6px;'/span class='alertTxt'備份數(shù)據(jù)庫(kù)成功!/spanimg src='images/aR.gif' style='margin-bottom:-6px;'//div";
}
/// summary
/// 生成備份文件列表
/// /summary
/// returns文件列表,文件詳細(xì)信息及操作選項(xiàng)的HTML代碼/returns
public void ListBackupFiles()
{
//如果目錄不存在則創(chuàng)建次目錄
if (!Directory.Exists(HttpContext.Current.Request.PhysicalApplicationPath + "Backup\\"))
Directory.CreateDirectory(HttpContext.Current.Request.PhysicalApplicationPath + "Backup\\");
DirectoryInfo mydir = new DirectoryInfo(HttpContext.Current.Request.PhysicalApplicationPath + "Backup\\");
StringBuilder sb = new StringBuilder();
foreach (FileInfo f in mydir.GetFiles())
{
sb.Append("a href='backup/" + f.Name + "' target='_blank'img border='0' src='images/mdb.gif' style='margin:4px 3px -3px 0px'/" + f.Name + "/a a href='?cmd=DelFilesource=" + f.Name + "' title='刪除備份文件'刪除/a | a href='?cmd=Restoresource=" + f.Name + "' title='刪除備份文件'還原數(shù)據(jù)庫(kù)/a | " + f.Length/1024 + " KB | " + f.CreationTime + "br /");
}
lilBackupFileList.Text = sb.ToString();
}
}
把下面這句換成你的數(shù)據(jù)庫(kù)地址:
//數(shù)據(jù)庫(kù)路徑
// lilDBPath.Text = HttpContext.Current.Request.PhysicalApplicationPath + "App_Data\\" + ConfigurationSettings.AppSettings["DBFile"];
需要聲明使用CommandBuilder對(duì)象,你是 SQL 數(shù)據(jù)庫(kù)還是 ACCESS 數(shù)據(jù)庫(kù),這兩者的對(duì)象不一樣的。
對(duì)于:SQL server
Dim Mybuilder As SqlCommandBuilder = New SqlCommandBuilder(da)
da.Update(dt) '使用Update方法實(shí)現(xiàn)更新到數(shù)據(jù)庫(kù)
對(duì)于:ACCESS
Dim Mybuilder As OleDbCommandBuilder = New OleDbCommandBuilder(da)
da.Update(dt) '使用Update方法實(shí)現(xiàn)更新到數(shù)據(jù)庫(kù)
你把數(shù)據(jù)庫(kù)中的數(shù)據(jù)查詢出來保存在DataSet 中
DataSet 是脫機(jī)的數(shù)據(jù)集,也即與數(shù)據(jù)庫(kù)斷開的數(shù)據(jù)集
把DataSet綁定到GridView上,這時(shí)候你在GridView上的操作就都是與數(shù)據(jù)庫(kù)斷開的
當(dāng)前題目:vb.net還原數(shù)據(jù)庫(kù),vbios還原
新聞來源:http://chinadenli.net/article6/heihog.html
成都網(wǎng)站建設(shè)公司_創(chuàng)新互聯(lián),為您提供定制網(wǎng)站、、響應(yīng)式網(wǎng)站、面包屑導(dǎo)航、App設(shè)計(jì)、品牌網(wǎng)站制作
聲明:本網(wǎng)站發(fā)布的內(nèi)容(圖片、視頻和文字)以用戶投稿、用戶轉(zhuǎn)載內(nèi)容為主,如果涉及侵權(quán)請(qǐng)盡快告知,我們將會(huì)在第一時(shí)間刪除。文章觀點(diǎn)不代表本網(wǎng)站立場(chǎng),如需處理請(qǐng)聯(lián)系客服。電話:028-86922220;郵箱:631063699@qq.com。內(nèi)容未經(jīng)允許不得轉(zhuǎn)載,或轉(zhuǎn)載時(shí)需注明來源: 創(chuàng)新互聯(lián)
猜你還喜歡下面的內(nèi)容