SQL Server备份和恢复

Question

备份

string connectionString1 = (@"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|Database1.mdf;Database=Database1;Integrated Security=True; User Instance=True");
            SqlConnection cn = new SqlConnection(connectionString1);
            cn.Open();
            SqlCommand cmd = new SqlCommand();
            SqlDataReader reader;
            cmd.CommandText = @"BACKUP DATABASE Database1 TO DISK = 'C:\SRI2Works.bak'";

            cmd.CommandType = CommandType.Text;
            cmd.Connection = cn;
            reader = cmd.ExecuteReader();
            cn.Close();
            MessageBox.Show("Database Backup Successfull.");

还原

string connectionString1 = (@"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|Database1.mdf;Database=Database1;Integrated Security=True; User Instance=True");
            SqlConnection cn = new SqlConnection(connectionString1);
            cn.Open();

            SqlCommand cmd = new SqlCommand();
            SqlDataReader reader;
            cmd.CommandText = @"use master; RESTORE DATABASE Database1 FROM DISK = 'C:\SRI2Works.bak'";
            cmd.CommandText = "DBCC CHECKDB ('Database1')";
            cmd.CommandType = CommandType.Text;
            cmd.Connection = cn;
            reader = cmd.ExecuteReader();
            cn.Close();
            MessageBox.Show("Database Restored Successfull.");

这段代码运行成功，但是没有做出任何改变。

- user2252491

---

你是如何验证代码确实被执行了的？消息框有弹出吗？ - usr

文件 C:\SRI2Works.bak 是否已经写入？而且，就目前而言，您的还原命令只执行 DBCC CHECKDB ('Database1')，这将替换在上一行中设置的 CommandText。 - Thomas Gerstendörfer

@ThomasGerstendörfer 很好的发现！原帖作者应该使用SQL Profiler来验证是否实际发送了预期的命令。 - usr

我认为你不能使用通常的BACKUP和RESTORE命令来备份使用AttachDbFileName=在SQL Server Express中附加的.mdf文件。据我所知，你的数据库必须附加到SQL Server实例才能使用BACKUP DATABASE进行备份... - marc_s

请查看如何备份和还原SQL Server Express数据库- "自动连接"数据库是使用与.mdf文件的完整路径匹配的名称附加的，您需要在进行备份和还原时将该完整路径作为您的数据库名称。 - marc_s

Answer 1

在还原数据库中尝试此代码：

    private void restoreButton_Click(object sender, EventArgs e)
    {
    string database = con.Database.ToString();
    if (con.State != ConnectionState.Open)
    {
        con.Open();
    }
    try
    {
        string sqlStmt2 = string.Format("ALTER DATABASE [" + database + "] SET SINGLE_USER WITH ROLLBACK IMMEDIATE");
        SqlCommand bu2 = new SqlCommand(sqlStmt2, con);
        bu2.ExecuteNonQuery();

        string sqlStmt3 = "USE MASTER RESTORE DATABASE [" + database + "] FROM DISK='" + textBox2.Text + "'WITH REPLACE;";
        SqlCommand bu3 = new SqlCommand(sqlStmt3, con);
        bu3.ExecuteNonQuery();

        string sqlStmt4 = string.Format("ALTER DATABASE [" + database + "] SET MULTI_USER");
        SqlCommand bu4 = new SqlCommand(sqlStmt4, con);
        bu4.ExecuteNonQuery();

        MessageBox.Show("database restoration done successefully");
        con.Close();

   }
   catch (Exception ex)
   {
        MessageBox.Show(ex.ToString());
   }
}

如需更多解释，请查看本教程：使用C#备份和恢复Sql Server数据库

- user4340666

---

太棒了。节省了我的时间。还有加一分给参考链接 :) - Mehmood

Answer 2

例如，我们有两个菜单条：一个用于备份，另一个用于恢复，因此它们执行它们的方法！试试这个：

    private void saveDatabaseToolStripMenuItem_Click(object sender, EventArgs e)
    {
        try
        {
            BackupDatabase();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message + " \nPlease choose the folder Sauvegardes to backup !");
        }

    }
    private void restoreDatabaseToolStripMenuItem_Click(object sender, EventArgs e)
    {
        try
        {
            RestoreDatabase();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }
    private void BackupDatabase()
    {
        saveFileDialogBackUp.InitialDirectory = AppDomain.CurrentDomain.BaseDirectory + @"Sauvegardes";
        if (saveFileDialogBackUp.ShowDialog() == DialogResult.OK)
        {
            Con.ExecuteCmd("BACKUP DATABASE MyFooDatabase TO DISK = '" + saveFileDialogBackUp.FileName + "'");
            MessageBox.Show("Success , done!", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }
    }
    private void RestoreDatabase()
    {
        openFileDialogBackUp.InitialDirectory = AppDomain.CurrentDomain.BaseDirectory + @"Sauvegardes";
        if (openFileDialogBackUp.ShowDialog() == DialogResult.OK)
        {
            Con.ExecuteCmd(" USE MASTER RESTORE DATABASE MyFooDatabase FROM DISK = '"+openFileDialogBackUp.FileName+"' WITH REPLACE");
            MessageBox.Show("Database Restored", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }

    }

- Obama

Answer 3

请从您的代码中删除以下语句：

cmd.CommandText = "DBCC CHECKDB ('Database1')";

如果您想覆盖现有的数据库，请使用以下命令进行命令文本：

cmd.CommandText = @"use master; RESTORE DATABASE Database1 FROM DISK = 'C:\SRI2Works.bak' WITH REPLACE";

- Lallawmkima

Answer 4

RESTORE DATABASE [C] FROM DISK = 'D:\\Inventory.bak' WITH RECOVERY, 
MOVE 'Inventory_Data'
 TO 'C:\\Program Files\\Microsoft SQL Server\\MSSQL\\Data\\c_Data.MDF', 
MOVE 'Inventory_Log' 
TO 
'C:\\Program Files\\Microsoft SQL Server\\MSSQL\\Data\\c_Log.LDF', 
REPLACE, stats =1

你需要关注的唯一事情是，在 MS SQL SERVER 中没有创建恢复数据库。在我的情况下，查询运行后应该创建一个名为[C]的新数据库，并将其文件创建在路径[C:\\Program Files\\Microsoft SQL Server\\MSSQL\\Data\\]中。

- Mansoor