From 0e242801e7ca6e6f387e6ecc99df493113102e93 Mon Sep 17 00:00:00 2001
From: luptmoor <lukas.uptmoor@web.de>
Date: Wed, 25 Feb 2026 18:19:22 +0100
Subject: [PATCH] simple Python app that conencts to db

---
 Dockerfile           | 12 ++++++++++++
 app/main.py          | 35 +++++++++++++++++++++++++++++++++++
 app/requirements.txt |  2 ++
 docker-compose.yml   | 19 +++++++++++++++++++
 4 files changed, 68 insertions(+)
 create mode 100644 Dockerfile
 create mode 100644 app/main.py
 create mode 100644 app/requirements.txt

diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..5351a70
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,12 @@
+FROM python:3.11-slim
+
+RUN apt-get update && apt-get install -y libpq-dev gcc \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+COPY app/requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY app/ .
+
+CMD ["python", "main.py"]
\ No newline at end of file
diff --git a/app/main.py b/app/main.py
new file mode 100644
index 0000000..b62f1c0
--- /dev/null
+++ b/app/main.py
@@ -0,0 +1,35 @@
+import os
+import psycopg2
+import time
+
+
+DB_USER = os.getenv("POSTGRES_USER");
+DB_PASSWWORD = os.getenv("POSTGRES_PASSWORD");
+DB_NAME = os.getenv("POSTGRES_DB");
+DB_HOST = os.getenv("POSTGRES_HOST");
+
+
+
+def connect_db():
+    while True:
+        try:
+            conn = psycopg2.connect(
+                host=DB_HOST,
+                database=DB_NAME,
+                user=DB_USER,
+                password=DB_PASSWWORD
+            )
+            print("Connected to the database successfully!")
+            return conn
+        except psycopg2.OperationalError as e:
+            print(f"Database connection failed: {e}")
+            time.sleep(3)
+
+
+if __name__ == "__main__":
+    print("starting app.")
+    conn = connect_db();
+    cursor = conn.cursor()
+    cursor.execute("SELECT postgis_full_version();")
+
+    print("obst", cursor.fetchone());
\ No newline at end of file
diff --git a/app/requirements.txt b/app/requirements.txt
new file mode 100644
index 0000000..80ac694
--- /dev/null
+++ b/app/requirements.txt
@@ -0,0 +1,2 @@
+psycopg2-binary==2.9.3
+SQLAlchemy==1.4.36
\ No newline at end of file
diff --git a/docker-compose.yml b/docker-compose.yml
index a14b35b..ad81c79 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -13,6 +13,25 @@ services:
     networks:
       - backend
 
+
+
+
+  app:
+    build: .
+    container_name: geo-app
+    environment:
+      PYTHONUNBUFFERED: 1
+      POSTGRES_USER: ${GEODB_USER}
+      POSTGRES_PASSWORD: ${GEODB_PW}
+      POSTGRES_DB: ${GEODB_NAME}
+      POSTGRES_HOST: geo-db-postgis
+    depends_on:
+      - geo-db-postgis
+    networks:
+      - backend
+
+
+
 volumes:
   pgdata:
     driver: local