Use sql batch to optimize

api/s2_junctions.py

@@ -152,7 +152,7 @@ def inp_in_junction(section: list[str]) -> ChangeSet:
     return cs
 
 
-def inp_in_junction_new(name: str, line: str) -> None:
+def inp_in_junction_new(line: str, demand_outside: bool) -> str:
     tokens = line.split()
 
     num = len(tokens)
@@ -166,9 +166,11 @@ def inp_in_junction_new(name: str, line: str) -> None:
     pattern = f"'{pattern}'" if pattern != None else 'null'
     desc = str(tokens[-1]) if has_desc else None
 
-    write(name, f"insert into _node (id, type) values ('{id}', 'junction');")
-    write(name, f"insert into junctions (id, elevation) values ('{id}', {elevation});")
-    write(name, f"insert into demands (junction, demand, pattern) values ('{id}', {demand}, {pattern});")
+    sql = f"insert into _node (id, type) values ('{id}', 'junction');insert into junctions (id, elevation) values ('{id}', {elevation});"
+    if demand != None and demand_outside == False:
+        sql += f"insert into demands (junction, demand, pattern) values ('{id}', {demand}, {pattern});"
+
+    return sql
 
 
 def inp_out_junction(name: str) -> list[str]: