What are some strategies for debugging PHP code that is not executing database queries as expected?

Issue: When PHP code is not executing database queries as expected, it could be due to errors in the database connection, query syntax, or data retrieval process. To debug this issue, you can start by checking the database connection parameters, ensuring the query syntax is correct, and using error handling to identify any issues with the query execution. Code snippet: 

<?php
// Database connection parameters
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Sample query
$sql = "SELECT * FROM table_name";
$result = $conn->query($sql);

// Check if query executed successfully
if ($result === FALSE) {
    echo "Error: " . $sql . "<br>" . $conn->error;
} else {
    // Process the query results
    while($row = $result->fetch_assoc()) {
        echo "Column1: " . $row["column1"]. " - Column2: " . $row["column2"]. "<br>";
    }
}

// Close connection
$conn->close();
?>

Keywords

PHP debugging database queries SQL error handling

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