README.md

Connection Retry Examples

This directory contains examples demonstrating the connection retry functionality.

Files

• 01-retry-examples.php - Basic retry configuration and usage examples

Features Demonstrated

• Basic Retry Configuration: Setting up retry with custom parameters
• Normal Operations: How retry works transparently with existing code
• Query Builder Integration: Retry works with all Query Builder methods
• Different Retry Strategies: Aggressive vs conservative retry configurations
• Retry Disabled: How to disable retry functionality
• Default Behavior: What happens without retry configuration

Retry Configuration Options

'retry' => [
    'enabled' => true,                    // Enable/disable retry
    'max_attempts' => 3,                  // Maximum retry attempts
    'delay_ms' => 1000,                   // Initial delay between retries (milliseconds)
    'backoff_multiplier' => 2,            // Exponential backoff multiplier
    'max_delay_ms' => 10000,              // Maximum delay between retries
    'retryable_errors' => [2002, 2003, 2006]  // Error codes to retry on
]

Error Codes

MySQL

• 2002 - Can't connect to local MySQL server
• 2003 - Can't connect to MySQL server
• 2006 - MySQL server has gone away
• 2013 - Lost connection to MySQL server

PostgreSQL

• 57P01 - Admin shutdown
• 57P03 - Cannot connect now

Usage

# Run the example
php examples/09-connection-retry/01-retry-examples.php

The example will demonstrate various retry configurations and show how the retry functionality integrates seamlessly with existing PdoDb operations.