备份数据

@@ -37,21 +37,28 @@ foreach ($tables as $table){
 
     $p = 0;
     $limit = 1000;
+    $totalBackupCount = 0;
     while (1){
         echo "正在备份数据 当前 $p 页\r";
         $lists = db()->all("select * from `{$table}` limit {$limit} offset ".($p*$limit));
         if($lists){
-            foreach ($lists as $list)
-                file_put_contents($datafile,json_encode($list,true),FILE_APPEND);
+            $backupCount = 0;
+            foreach ($lists as $list) {
+                // 每行一个独立的JSON对象，添加换行符以便恢复时正确解析
+                file_put_contents($datafile, json_encode($list, JSON_UNESCAPED_UNICODE) . "\n", FILE_APPEND | LOCK_EX);
+                $backupCount++;
+                $totalBackupCount++;
+            }
+            // 如果当前页数据少于限制数量，说明已经是最后一页
+            if ($backupCount < $limit) {
+                break;
+            }
         }else{
             break;
         }
         $p++;
-
     }
 
-    echo "\n";
-
-}
-
+    echo "表 {$table} 备份完成，共 {$totalBackupCount} 条记录\n";
 
+}
\ No newline at end of file