Java MySQL Database Connection and Data Retrieval Example

This Java program successfully connects to a MySQL database server using the provided URL, username, and password. It then executes a SQL select statement to retrieve data from the 'cmd_online' table, with a specific entity_imei value. The retrieved data is then printed to the console using the System.out.println() statement.

The code snippet demonstrates the following key concepts:

1. Database Connection: Establishes a connection to the MySQL database server using the DriverManager.getConnection() method.
2. Prepared Statement: Creates a PreparedStatement object to execute the SQL query securely, preventing SQL injection attacks.
3. Data Retrieval: Executes the SQL query using the executeQuery() method and retrieves the results in a ResultSet object.
4. Data Iteration: Iterates through the ResultSet using a while loop and retrieves data from each row using the getString() method.
5. Error Handling: Handles potential SQL exceptions using a try-catch block and prints the exception details to the console using the e.printStackTrace() method.

This example provides a basic foundation for interacting with MySQL databases from Java applications. You can modify and adapt the SQL query and data handling logic to fit your specific requirements.