问题
I need to backup a database by clicking a button on the windows application form. I'm developing it on Visual Studio 2012 in C#.
In Windows site, I learned to backup using Transact SQL. I tried it from Transact SQL editor in visual studio.
Here is the SQL transact I used:
USE TestDB;
GO
BACKUP DATABASE TestDB
TO DISK = 'E:\aa.Bak'
WITH FORMAT,
MEDIANAME = 'Z_SQLServerBackups',
NAME = 'Full Backup of AdventureWorks2012';
GO
I want to execute this in C#.
Also whenever I click the backup button, I want to create a backup file and replace any existing backup file. Does the 'FORMAT' parameter does this purpose?
Can I set the parameter TO DISK (location where the backup file is created) to a location in an external hard disk or pen drive?
I can restore a databse as follows:
private void button4_restore(object sender, EventArgs e)<br/>
{
con.Open();<br/>
string str = "USE master;";<br/>
string str1= "ALTER DATABASE TestDB SET SINGLE_USER WITH ROLLBACK IMMEDIATE;";
string str3="RESTORE DATABASE TestDB FROM DISK = 'E:\\aa.Bak' ";<br/>
SqlCommand cmd = new SqlCommand(str, con);<br/>
SqlCommand cmd1 = new SqlCommand(str1, con);<br/>
SqlCommand cmd3 = new SqlCommand(str3, con);<br/>
cmd.ExecuteNonQuery();<br/>
cmd1.ExecuteNonQuery();<br/>
cmd3.ExecuteNonQuery();<br/>
MessageBox.Show("RECOVERED");<br/>
con.Close();
}
When I restore like this, the database is restored completely to the backup file. Is there a way by which I can append the data in .Bak file with the existing data in current database.
回答1:
The following code backups the database 'TestDB' to the file 'E.\backupfile.Bak' if button 'button_backup' is clicked.
private void button_backup_Click(object sender, EventArgs e)
{
//con is the connection string
con.Open();
string str = "USE TestDB;";
string str1="BACKUP DATABASE TestDB TO DISK = 'E:\\backupfile.Bak' WITH FORMAT,MEDIANAME = 'Z_SQLServerBackups',NAME = 'Full Backup of Testdb';";
SqlCommand cmd1 = new SqlCommand(str, con);
SqlCommand cmd2 = new SqlCommand(str1, con);
cmd1.ExecuteNonQuery();
cmd2.ExecuteNonQuery();
MessageBox.Show("success");
con.Close();
}
来源：https://stackoverflow.com/questions/17477355/backup-sql-server-database-from-windows-form-application-by-a-button-click