cmdStudent.execute("Backup Database student1 To Disk='"+filePath+"'");
//改为:
cmdStudent.execute("use master;alter database student1 set single_user with rollback immediate;Restore Database student1 from Disk='"+file.getPath()+"'");
//改为:
cmdStudent.execute("use master;alter database student1 set single_user with rollback immediate;Restore Database student1 from Disk='"+file.getPath()+"'");
试试3楼
set single_user with rollback immediate;