Merge pull request #9 from v1shwa/feature/mssql-example

Setup an example project using mssql and pyodbc

examples/app-mssql/Dockerfile

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+FROM laudio/pyodbc:1.0.8
+LABEL author="Vishwa"
+
+WORKDIR /app
+
+# Copy code to container
+COPY . .
+
+CMD ["python", "main.py"]

examples/app-mssql/README.md

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+# MSSQL Example
+Example project using mssql with pyodbc docker image.
+
+### Usage
+
+- Set credentials for the DB in enviromental variables.
+```                                                                      
+export DB_NAME='tempdb';
+export DB_USERNAME='SA';
+export DB_PASSWORD='someP4ssword';
+```
+- Start the containers
+
+```
+docker-compose up
+```

examples/app-mssql/docker-compose.yml

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+version: '3.3'
+
+services:
+  mssql_server:
+    image: "mcr.microsoft.com/mssql/server:2017-GA-ubuntu"
+    ports:
+      - "1433:1433"
+    environment:
+      ACCEPT_EULA: Y
+      SA_PASSWORD: ${DB_PASSWORD}
+  mssql_example_project:
+    build: .
+    depends_on:
+      - mssql_server
+    environment:
+      DB_HOST: mssql_server
+      DB_NAME: ${DB_NAME}
+      DB_USERNAME: ${DB_USERNAME}
+      DB_PASSWORD: ${DB_PASSWORD}

examples/app-mssql/main.py

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+import sys
+import os
+import time
+import pyodbc
+
+# waiting for mssql db server to fully spawn
+time.sleep(3)
+
+print("Creating a mssql connection")
+connection_str = 'DRIVER={{ODBC Driver 17 for SQL Server}};SERVER={server};DATABASE={database};UID={username};PWD={password};'.format(
+        server=os.environ['DB_HOST'],
+        database=os.environ['DB_NAME'],
+        username=os.environ['DB_USERNAME'],
+        password=os.environ['DB_PASSWORD']
+    )
+conn = pyodbc.connect(connection_str, timeout=300)
+cur = conn.cursor()
+
+
+print("Create a new table: fruits")
+cur.execute("CREATE TABLE fruits (id INT, name NVARCHAR(50), quantity INT);")
+conn.commit()
+
+print("Insert data into `fruits` table")
+cur.execute("INSERT INTO fruits VALUES (1, 'banana', 150);")
+cur.execute("INSERT INTO fruits VALUES (2, 'orange', 64);")
+cur.execute("INSERT INTO fruits VALUES (2, 'apples', 35);")
+conn.commit()
+
+print("Select data from `fruits` table")
+cur.execute("SELECT * FROM fruits WHERE quantity > 50;")
+rows = cur.fetchall()
+for row in rows:
+    print(row.id, row.name, row.quantity)
+
+print("Closing the connection")
+cur.close()
+conn.close()
+
+sys.exit(0)