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<?php
/**
 * Database class used by the database dropin.
 *
 * @package query-monitor
 */

class QM_DB extends wpdb {

	/**
	 * @var float
	 */
	public $time_start;

	/**
	 * @var array<string, string|null>
	 */
	public $qm_php_vars = array(
		'max_execution_time' => null,
		'memory_limit' => null,
		'upload_max_filesize' => null,
		'post_max_size' => null,
		'display_errors' => null,
		'log_errors' => null,
	);

	/**
	 * Class constructor
	 */
	public function __construct( $dbuser, $dbpassword, $dbname, $dbhost ) {

		foreach ( $this->qm_php_vars as $setting => &$val ) {
			$val = ini_get( $setting );
		}

		parent::__construct( $dbuser, $dbpassword, $dbname, $dbhost );

	}

	/**
	 * Performs a MySQL database query, using current database connection.
	 *
	 * @see wpdb::query()
	 *
	 * @param string $query Database query
	 * @return int|bool Boolean true for CREATE, ALTER, TRUNCATE and DROP queries. Number of rows
	 *                  affected/selected for all other queries. Boolean false on error.
	 */
	public function query( $query ) {
		if ( $this->show_errors ) {
			$this->hide_errors();
		}

		$result = parent::query( $query );
		$i = $this->num_queries - 1;

		if ( did_action( 'qm/cease' ) ) {
			// It's not possible to prevent the parent class from logging queries because it reads
			// the `SAVEQUERIES` constant and I don't want to override more methods than necessary.
			$this->queries = array();
		}

		if ( ! isset( $this->queries[ $i ] ) ) {
			return $result;
		}

		$this->queries[ $i ]['trace'] = new QM_Backtrace();

		if ( ! isset( $this->queries[ $i ][3] ) ) {
			$this->queries[ $i ][3] = $this->time_start;
		}

		if ( $this->last_error ) {
			$code = 'qmdb';

			if ( $this->dbh instanceof mysqli ) {
				$code = mysqli_errno( $this->dbh );
			}

			if ( is_resource( $this->dbh ) ) {
				// Please do not report this code as a PHP 7 incompatibility. Observe the surrounding logic.
				// phpcs:ignore
				$code = mysql_errno( $this->dbh );
			}

			$this->queries[ $i ]['result'] = new WP_Error( $code, $this->last_error );
		} else {
			$this->queries[ $i ]['result'] = $result;
		}

		return $result;
	}

}