init

src/db/DatabaseBackupRunner.java

@@ -0,0 +1,68 @@
+package db;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.*;
+import java.time.LocalDate;
+import java.time.format.DateTimeFormatter;
+import java.util.Comparator;
+
+public class DatabaseBackupRunner {
+
+    private static final String REQUIRED_USER = "cbu615";
+    private static final String BACKUP_DIR = "V:\\Schulungsstatistik_Backup";
+    private static final String DB_FILE = util.Config.getDbPath();
+    private static final DateTimeFormatter FMT = DateTimeFormatter.ofPattern("yyyy-MM-dd");
+
+    /** Call this once on program start */
+    public static void runBackupCheck() {
+        if (!System.getProperty("user.name").equalsIgnoreCase(REQUIRED_USER)) return;
+        
+
+        File backupFolder = new File(BACKUP_DIR);
+        if (!backupFolder.exists()) backupFolder.mkdirs();
+
+        LocalDate newest = findNewestBackupDate(backupFolder);
+
+        if (newest == null || newest.isBefore(LocalDate.now().minusDays(7))) {
+        	System.out.println("creating backup...");
+            createBackup(backupFolder);            
+        } else
+        {
+        	System.out.println("no backup needed; last backup in " + BACKUP_DIR + " (" + newest.format(DateTimeFormatter.ISO_LOCAL_DATE) + ")");
+        }
+    }
+
+    private static LocalDate findNewestBackupDate(File folder) {
+        File[] files = folder.listFiles((dir, name) -> name.startsWith("backup_") && name.endsWith(".db"));
+        if (files == null || files.length == 0) return null;
+
+        return java.util.Arrays.stream(files)
+            .map(f -> {
+                try {
+                    String datePart = f.getName().substring("backup_".length(), "backup_".length() + 10);
+                    return LocalDate.parse(datePart, FMT);
+                } catch (Exception e) {
+                    return null;
+                }
+            })
+            .filter(d -> d != null)
+            .max(Comparator.naturalOrder())
+            .orElse(null);
+    }
+
+    private static void createBackup(File folder) {
+        String date = LocalDate.now().format(FMT);
+        File target = new File(folder, "backup_" + date + ".db");       
+
+        try {
+            Files.copy(
+                Paths.get(DB_FILE),
+                target.toPath(),
+                StandardCopyOption.REPLACE_EXISTING
+            );
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}