add backend source code

backend/rebuild_db.py

@@ -0,0 +1,31 @@
+"""重建数据库"""
+import asyncio
+import asyncpg
+
+
+async def main():
+    # 连接到 postgres 数据库
+    conn = await asyncpg.connect(
+        'postgresql://postgresql:Jchl1528@192.168.110.252:15432/postgres'
+    )
+    try:
+        # 终止所有连接
+        await conn.execute("""
+            SELECT pg_terminate_backend(pid)
+            FROM pg_stat_activity
+            WHERE datname = 'hospital_performance' AND pid <> pg_backend_pid()
+        """)
+        
+        # 删除数据库
+        await conn.execute('DROP DATABASE IF EXISTS hospital_performance')
+        print('数据库已删除')
+        
+        # 重新创建
+        await conn.execute('CREATE DATABASE hospital_performance')
+        print('数据库已创建')
+    finally:
+        conn.terminate()
+
+
+if __name__ == '__main__':
+    asyncio.run(main())