What potential pitfalls should be considered when transferring data between databases using PHP?

Potential pitfalls when transferring data between databases using PHP include data loss due to incompatible data types, security vulnerabilities if input is not properly sanitized, and performance issues if large amounts of data are being transferred inefficiently. To address these pitfalls, it is important to validate and sanitize input data, handle errors gracefully, and use appropriate data types when transferring data between databases. 

// Example code snippet demonstrating transferring data between databases in PHP

// Connect to source database
$sourceConn = new mysqli('source_host', 'source_username', 'source_password', 'source_database');

// Connect to destination database
$destConn = new mysqli('dest_host', 'dest_username', 'dest_password', 'dest_database');

// Retrieve data from source database
$sourceData = $sourceConn->query('SELECT * FROM source_table');

// Transfer data to destination database
while ($row = $sourceData->fetch_assoc()) {
    // Sanitize input data before transferring
    $sanitizedData = $destConn->real_escape_string($row['data']);

    // Insert sanitized data into destination database
    $destConn->query("INSERT INTO dest_table (data) VALUES ('$sanitizedData')");
}

// Close database connections
$sourceConn->close();
$destConn->close();

Keywords

SQL injection data validation PDO prepared statements error handling

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