What are the recommended steps for establishing a database connection, selecting a database, and executing SQL statements in PHP?

Establishing a database connection, selecting a database, and executing SQL statements in PHP involves using the PDO (PHP Data Objects) extension. This extension provides a consistent interface for accessing databases in PHP, allowing you to connect to a database, select a specific database, and execute SQL queries. 

// Establish a database connection
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    echo "Connected successfully";
} catch(PDOException $e) {
    echo "Connection failed: " . $e->getMessage();
}

// Select a specific database
$conn->exec("USE $dbname");

// Execute SQL statements
$sql = "SELECT * FROM table_name";
$stmt = $conn->query($sql);

while ($row = $stmt->fetch()) {
    echo $row['column_name'] . "<br>";
}

Keywords

PHP database connection MySQL SQL statements error handling

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