數據庫備份與還原的sql語句
//數據庫備份
backup database northwind to disk='c:\dbbackup\northwind.bak';
//數據庫還原
//數據庫還原
use master;
alter database northwind set offline with rollback immediate
restore database northwind from disk='c:\dbbackup\northwind.bak'
alter database northwind set online with rollback immediate;
winform界面設計
代碼
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace SqlBackupAndRestore
{
public partial class FrmBackup : Form
{
public string strConnection { get; set; }
public FrmBackup()
{
InitializeComponent();
//默認數據庫名稱和備份路徑
txtDBName.Text = "northwind";
txtBackupPath.Text = @"c:\dbbackup";
strConnection = ConfigurationManager.ConnectionStrings["sqlserver"].ConnectionString;
GetBackupFiles(txtBackupPath.Text);
}
/// <summary>
/// 選擇數據庫備份路徑
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnSelect_Click(object sender, EventArgs e)
{
FolderBrowserDialog dialog = new FolderBrowserDialog();
dialog.Description = "請選擇數據庫備份所在文件夾";
if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
if (string.IsNullOrEmpty(dialog.SelectedPath))
{
MessageBox.Show(this, "文件夾路徑不能爲空", "提示");
return;
}
txtBackupPath.Text = dialog.SelectedPath;
GetBackupFiles(txtBackupPath.Text);
}
}
/// <summary>
/// 獲取所有數據庫備份
/// </summary>
/// <param name="path"></param>
private void GetBackupFiles(string path)
{
string[] files = Directory.GetFiles(path, "*.bak");
lbBackups.Items.Clear();
lbBackups.Items.AddRange(files);
}
/// <summary>
/// 數據庫備份
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnBackup_Click(object sender, EventArgs e)
{
//數據庫名稱
if (string.IsNullOrEmpty(txtDBName.Text))
{
MessageBox.Show("請輸入需要備份的數據庫名稱!","提示",MessageBoxButtons.OK,MessageBoxIcon.Warning);
return;
}
if (string.IsNullOrEmpty(txtBackupPath.Text))
{
MessageBox.Show("請輸入存放備份的目錄!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
else if (!Directory.Exists(txtBackupPath.Text))
{
MessageBox.Show("路徑不存在");
return;
}
else
{
//yyyyMMddHHmmss爲24小時制，yyyyMMddhhmmss爲12小時制
string backFile = txtDBName.Text + DateTime.Now.ToString("yyyyMMddHHmmss") + ".bak";
DbBackupHelper.BackupDataBase(strConnection, txtDBName.Text, txtBackupPath.Text, backFile);
GetBackupFiles(txtBackupPath.Text);
MessageBox.Show("備份成功", "結果", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
/// <summary>
/// 數據庫還原
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnRestore_Click(object sender, EventArgs e)
{
if (string.IsNullOrEmpty(txtDBName.Text))
{
MessageBox.Show("請先輸入數據庫名稱", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else if (lbBackups.SelectedItem == null)
{
MessageBox.Show("請先選擇需要還原的備份文件!");
}
else if (!File.Exists(lbBackups.SelectedItem.ToString()))
{
MessageBox.Show("備份文件不存在!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else
{
DbBackupHelper.RestoreDataBase(strConnection,txtDBName.Text, lbBackups.SelectedItem.ToString());
MessageBox.Show("數據庫還原成功！", "結果", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
}
DBBackupHelper代碼：
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SqlBackupAndRestore
{
public class DbBackupHelper
{
/// <summary>
/// 還原數據庫
/// </summary>
public static bool RestoreDataBase(string connectionString, string dataBaseName, string dataBaseBackupFile)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
conn.Open();
SqlCommand comm = new SqlCommand();
comm.Connection = conn;
//comm.CommandText = "use master;restore database @DataBaseName From disk = @BackupFile with replace;";
// alter database不支持參數化語法
comm.CommandText = "use master;alter database " + dataBaseName + " set offline with rollback immediate; restore database " + dataBaseName + " from disk='" + dataBaseBackupFile + "' with replace;alter database " + dataBaseName + " set online with rollback immediate";
//comm.CommandText = "use master;alter database @dataBaseName set offline with rollback immediate; restore database @dataBaseName from disk='@backupFile' with replace;alter database @dataBaseName set online with rollback immediate";
//comm.Parameters.Add(new SqlParameter("dataBaseName", SqlDbType.NVarChar));
//comm.Parameters["dataBaseName"].Value = dataBaseName;
//comm.Parameters.Add(new SqlParameter("backupFile", SqlDbType.NVarChar));
//comm.Parameters["backupFile"].Value = dataBaseBackupFile;
comm.CommandType = CommandType.Text;
comm.ExecuteNonQuery();
}
return true;
}
/// <summary>
/// 備份SqlServer數據庫
/// </summary>
public static bool BackupDataBase(string connectionString, string dataBaseName, string backupPath, string backupName)
{
string filePath = Path.Combine(backupPath, backupName);
if (File.Exists(filePath))
{
File.Delete(filePath);
}
using (SqlConnection conn = new SqlConnection(connectionString))
{
conn.Open();
SqlCommand comm = new SqlCommand();
comm.Connection = conn;
comm.CommandText = "use master;backup database @dbname to disk = @backupname;";
comm.Parameters.Add(new SqlParameter("dbname", SqlDbType.NVarChar));
comm.Parameters["dbname"].Value = dataBaseName;
comm.Parameters.Add(new SqlParameter("backupname", SqlDbType.NVarChar));
comm.Parameters["backupname"].Value = filePath;
comm.CommandType = CommandType.Text;
comm.ExecuteNonQuery();
}
return true;
}
}
}
參考：
- 出現“System.Data.SqlClient.SqlError: 尚未備份數據庫的日誌尾部”錯誤的解決方案: https://www.cnblogs.com/feiyuhuo/p/5514344.html
- 數據庫備份錯誤
這個是因爲備份數據庫時，應用程序還在連接數據庫，需要先斷開數據庫
