[SQL-428] Checking Database Connectivity with a script

Author: jim-dotcom

sql-queries-10/checking-database-connectivity/mysql-check.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+# MySQL Database Connectivity Check Script
+
+# Create .env file if it doesn't exist
+if [ ! -f .env ]; then
+    cat > .env <<EOF
+# MySQL Configuration
+MYSQL_HOST="localhost"
+MYSQL_PORT="3306"
+MYSQL_USER="root"
+MYSQL_PASS="MySQL!2024"
+MYSQL_DB="University"
+EOF
+    echo "Created .env file with MySQL configuration"
+fi
+
+# Load environment variables
+source .env
+
+echo "Testing MySQL connectivity..."
+
+# Test MySQL connectivity and check for 'Department' table
+mysql -h "$MYSQL_HOST" -P "$MYSQL_PORT" -u "$MYSQL_USER" -p"$MYSQL_PASS" -e "USE $MYSQL_DB; SHOW TABLES LIKE 'Department';" >/dev/null 2>&1
+
+if [ $? -eq 0 ]; then
+  echo "MySQL: Connection successful and department table exists."
+else
+  echo "MySQL: Connection failed or department table does not exist."
+fi

sql-queries-10/checking-database-connectivity/postgres-check.sh

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+#!/bin/bash
+
+# PostgreSQL Database Connectivity Check Script
+
+# Create .env file if it doesn't exist
+if [ ! -f .env ]; then
+    cat > .env <<EOF
+DB_HOST="localhost"
+DB_PORT="5432"
+DB_USER="user"
+DB_PASS="Password!2024"
+DB_NAME="University"
+EOF
+    echo "Created .env file with PostgreSQL configuration"
+fi
+
+# Load environment variables
+source .env
+
+echo "Testing PostgreSQL connectivity..."
+
+# Test PostgreSQL connectivity and check for 'student' table
+PGPASSWORD="$DB_PASS" psql -h "$DB_HOST" -p "$DB_PORT" -U "$DB_USER" -d "$DB_NAME" -c '\dt student' >/dev/null 2>&1
+
+if [ $? -eq 0 ]; then
+  echo "PostgreSQL: Connection successful and student table exists."
+else
+  echo "PostgreSQL: Connection failed or student table does not exist."
+fi

sql-queries-10/checking-database-connectivity/python-db-check.sh

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+#!/bin/bash
+
+# Python Database Connectivity Check Script
+
+# Check if Python is installed
+if ! command -v python3 &> /dev/null; then
+    echo "Python 3 is not installed. Please install Python 3 first."
+    exit 1
+fi
+
+# Create .env file if it doesn't exist
+if [ ! -f .env ]; then
+    cat > .env <<EOF
+# PostgreSQL Configuration
+DB_HOST="localhost"
+DB_PORT="5432"
+DB_USER="user"
+DB_PASS="Password!2024"
+DB_NAME="University"
+
+# MySQL Configuration
+MYSQL_HOST="localhost"
+MYSQL_PORT="3306"
+MYSQL_USER="root"
+MYSQL_PASS="MySQL!2024"
+MYSQL_DB="University"
+EOF
+    echo "Created .env file with database configurations"
+fi
+
+# Install required Python packages
+echo "Installing required Python packages..."
+pip install psycopg2-binary mysql-connector-python python-dotenv > /dev/null 2>&1
+
+# Create PostgreSQL test script
+cat > test_pg_connect.py <<EOF
+import os
+import psycopg2
+from dotenv import load_dotenv
+
+# Load environment variables from .env
+load_dotenv()
+
+DB_HOST = os.getenv("DB_HOST")
+DB_PORT = os.getenv("DB_PORT")
+DB_NAME = os.getenv("DB_NAME")
+DB_USER = os.getenv("DB_USER")
+DB_PASS = os.getenv("DB_PASS")
+
+try:
+    connection = psycopg2.connect(
+        host=DB_HOST,
+        port=DB_PORT,
+        dbname=DB_NAME,
+        user=DB_USER,
+        password=DB_PASS
+    )
+
+    cursor = connection.cursor()
+    cursor.execute("SELECT to_regclass('public.student');")
+    table_exists = cursor.fetchone()[0]
+
+    if table_exists:
+        print("PostgreSQL: Connection successful and student table exists.")
+    else:
+        print("PostgreSQL: Connection successful but student table does not exist.")
+
+except Exception as e:
+    print(f"PostgreSQL: Connection failed - {e}")
+
+finally:
+    if 'connection' in locals():
+        connection.close()
+EOF
+
+# Create MySQL test script
+cat > test_mysql_connect.py <<EOF
+import os
+import mysql.connector
+from dotenv import load_dotenv
+
+# Load environment variables from .env
+load_dotenv()
+
+MYSQL_HOST = os.getenv("MYSQL_HOST")
+MYSQL_PORT = os.getenv("MYSQL_PORT")
+MYSQL_USER = os.getenv("MYSQL_USER")
+MYSQL_PASS = os.getenv("MYSQL_PASS")
+MYSQL_DB = os.getenv("MYSQL_DB")
+
+try:
+    connection = mysql.connector.connect(
+        host=MYSQL_HOST,
+        port=MYSQL_PORT,
+        user=MYSQL_USER,
+        password=MYSQL_PASS,
+        database=MYSQL_DB
+    )
+
+    cursor = connection.cursor()
+    cursor.execute("SHOW TABLES LIKE 'Department';")
+    result = cursor.fetchone()
+
+    if result:
+        print("MySQL: Connection successful and department table exists.")
+    else:
+        print("MySQL: Connection successful but department table does not exist.")
+
+except mysql.connector.Error as err:
+    print(f"MySQL: Connection failed - {err}")
+
+finally:
+    if 'connection' in locals() and connection.is_connected():
+        connection.close()
+EOF
+
+# Run the Python tests
+echo "Running PostgreSQL test..."
+python3 test_pg_connect.py
+
+echo "Running MySQL test..."
+python3 test_mysql_connect.py