diff --git a/build_db.py b/build_db.py
index 8329bf7..2da4a82 100644
--- a/build_db.py
+++ b/build_db.py
@@ -4,7 +4,7 @@ files = [
     'bwsn',
     'exnet',
     'fengxian',
-    'jbh',
+    #'jbh', # too big sql to compress
     'nanjing',
     'net3',
     'zj',
@@ -14,5 +14,11 @@ def inp2db():
     for file in files:
         read_inp(file, f'./inp/{file}.inp')
 
+def db2inp():
+    for file in files:
+        dump_inp(file, f'db_{file}.inp')
+
 if __name__ == '__main__':
-    inp2db()
\ No newline at end of file
+    #inp2db()
+    #db2inp()
+    pass
\ No newline at end of file