Air-Quality-Web/logic/Repositories/MariaDBMeasurementDataRepos...

78 lines
2.9 KiB
PHP

<?php
namespace AirQuality\Repositories;
/**
* Fetches measurement readings from a MariaDB database.
*/
class MariaDBMeasurementDataRepository implements IMeasurementDataRepository {
public static $table_name_metadata = "readings";
public static $table_name_values = "reading_values";
public static $column_values_id = "id";
public static $column_values_reading_id = "reading_id";
public static $column_values_value = "value";
public static $column_values_reading_value_types_id = "reading_value_types_id";
public static $column_metadata_id = "id";
public static $column_metadata_storedon = "storedon";
public static $column_metadata_recordedon = "recordedon";
public static $column_metadata_device_id = "device_id";
public static $column_metadata_lat = "reading_latitude";
public static $column_metadata_long = "reading_longitude";
// ------------------------------------------------------------------------
/**
* The database connection.
* @var \AirQuality\Database
*/
private $database;
/** Function that gets a static variable by it's name. Useful in preparing SQL queries. */
private $get_static;
private $get_static_extra;
function __construct(\AirQuality\Database $in_database) {
$this->database = $in_database;
$this->get_static = function($name) { return self::$$name; };
$this->get_static_extra = function($class_name, $name) {
return $class_name::$$name;
};
}
public function get_readings_by_date(\DateTime $datetime, string $reading_type) {
$s = $this->get_static;
$o = $this->get_static_extra;
return $this->database->query(
"SELECT
{$s("table_name_values")}.*,
{$s("table_name_metadata")}.device_id,
COALESCE(
{$s("table_name_metadata")}.{$s("column_metadata_recordedon")},
{$s("table_name_metadata")}.{$s("column_metadata_storedon")}
) AS datetime,
COALESCE(
{$s("table_name_metadata")}.{$s("column_metadata_lat")},
{$o(MariaDBDeviceRepository::class, "table_name")}.{$o(MariaDBDeviceRepository::class, "column_lat")}
) AS latitude,
COALESCE(
{$s("table_name_metadata")}.{$s("column_metadata_long")},
{$o(MariaDBDeviceRepository::class, "table_name")}.{$o(MariaDBDeviceRepository::class, "column_long")}
) AS longitude
FROM {$s("table_name_values")}
JOIN {$s("table_name_metadata")} ON {$s("table_name_values")}.{$s("column_values_reading_id")} = {$s("table_name_metadata")}.id
JOIN {$o(MariaDBDeviceRepository::class, "table_name")} ON {$s("table_name_metadata")}.{$s("column_metadata_device_id")} = {$o(MariaDBDeviceRepository::class, "table_name")}.{$o(MariaDBDeviceRepository::class, "column_device_id")}
WHERE COALESCE(
{$s("table_name_metadata")}.{$s("column_metadata_recordedon")},
{$s("table_name_metadata")}.{$s("column_metadata_storedon")}
) = :datetime", [
// The database likes strings, not PHP DateTime() instances
"datetime" => $datetime->format(\DateTime::ISO8601),
"reading_type" => $reading_type
]
)->fetchAll();
}
}