What potential pitfalls should be considered when retrieving images from a BLOB field in a MSSQL database using PHP?

When retrieving images from a BLOB field in a MSSQL database using PHP, potential pitfalls to consider include memory consumption when handling large images, ensuring proper error handling for database connections and queries, and implementing security measures to prevent SQL injection attacks. 

<?php
// Connect to MSSQL database
$serverName = "yourServerName";
$connectionInfo = array("Database" => "yourDatabase", "UID" => "yourUsername", "PWD" => "yourPassword");
$conn = sqlsrv_connect($serverName, $connectionInfo);

// Retrieve image from BLOB field
$sql = "SELECT image_blob FROM yourTable WHERE id = ?";
$params = array($id);
$stmt = sqlsrv_query($conn, $sql, $params);

if ($stmt === false) {
    // Handle error
    die(print_r(sqlsrv_errors(), true));
}

// Fetch image data
if ($row = sqlsrv_fetch_array($stmt, SQLSRV_FETCH_ASSOC)) {
    $imageData = $row['image_blob'];
    
    // Output image
    header("Content-type: image/jpeg");
    echo $imageData;
} else {
    // Handle no image found
    echo "Image not found";
}

// Close connection
sqlsrv_free_stmt($stmt);
sqlsrv_close($conn);
?>

Keywords

MSSQL BLOB field PHP image retrieval potential pitfalls

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