*** Backup Mirror *** The web interface and JSON api for the ConnectedHumber Air Quality Monitoring Project. https://github.com/ConnectedHumber/Air-Quality-Web
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<?php
namespace AirQuality\Repositories;
use \AirQuality\Database;
use \SBRL\TomlConfig;
/**
* 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_type = "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";
// ------------------------------------------------------------------------
/** @var TomlConfig */
private $settings;
/**
* The database connection.
* @var Database
*/
private $database;
/**
* Function that gets a static variable by it's name. Useful in preparing SQL queries.
* @var callable
*/
private $get_static;
/**
* Function that gets a static variable by it's name & class. Useful in preparing SQL queries.
* @var callable
*/
private $get_static_extra;
/**
* Creates a new reepository instance.
* It is suggested that PHP-DI is utilised for instantiation via the associated interface.
* @param Database $in_database The database connection to use.
* @param TomlConfig $in_settings The settings to operate with.
*/
function __construct(Database $in_database, TomlConfig $in_settings) {
$this->database = $in_database;
$this->settings = $in_settings;
$this->get_static = function($name) { return self::$$name; };
$this->get_static_extra = function($class_name, $name) {
return $class_name::$$name;
};
}
public function get_readings_by_date(\DateTime $datetime, int $type_id) {
$s = $this->get_static;
$o = $this->get_static_extra;
// OPTIMIZE: I think we can drastically improve the performance of this query by pre-calculating the start & end dates of the window
return $this->database->query(
"SELECT
{$s("table_name_values")}.{$s("column_values_value")},
{$s("table_name_values")}.{$s("column_values_reading_id")},
{$s("table_name_metadata")}.{$s("column_metadata_device_id")},
COALESCE(
{$s("table_name_metadata")}.{$s("column_metadata_recordedon")},
{$s("table_name_metadata")}.{$s("column_metadata_storedon")}
) AS datetime,
COUNT({$s("table_name_metadata")}.{$s("column_metadata_device_id")}) AS record_count
FROM {$s("table_name_values")}
JOIN {$s("table_name_metadata")} ON {$s("table_name_values")}.{$s("column_values_reading_id")} = {$s("table_name_metadata")}.id
WHERE ABS(TIME_TO_SEC(TIMEDIFF(
:datetime,
COALESCE(
{$s("table_name_metadata")}.{$s("column_metadata_recordedon")},
{$s("table_name_metadata")}.{$s("column_metadata_storedon")}
)
))) < :max_reading_timediff
AND
{$s("table_name_values")}.{$s("column_values_reading_type")} = :reading_type
GROUP BY {$s("table_name_metadata")}.{$s("column_metadata_device_id")}
ORDER BY {$s("table_name_metadata")}.{$s("column_metadata_recordedon")}
", [
// The database likes strings, not PHP DateTime() instances
"datetime" => $datetime->format(\DateTime::ISO8601),
"reading_type" => $type_id,
"max_reading_timediff" => $this->settings->get("data.max_reading_timediff")
]
)->fetchAll();
}
public function get_device_reading_bounds(int $device_id) {
$s = $this->get_static;
return $this->database->query(
"SELECT
MIN(COALESCE(
{$s("table_name_metadata")}.{$s("column_metadata_recordedon")},
{$s("table_name_metadata")}.{$s("column_metadata_storedon")}
)) AS start,
MAX(COALESCE(
{$s("table_name_metadata")}.{$s("column_metadata_recordedon")},
{$s("table_name_metadata")}.{$s("column_metadata_storedon")}
)) AS end
FROM {$s("table_name_metadata")}
WHERE {$s("table_name_metadata")}.{$s("column_metadata_device_id")} = :device_id;", [
"device_id" => $device_id
]
)->fetch();
}
public function get_readings_by_device(int $device_id, int $type_id, \DateTime $start, \DateTime $end, int $average_seconds = 1) {
if($average_seconds < 1)
throw new \Exception("Error: average_seconds must be greater than 1, but '$average_seconds' was specified.");
$s = $this->get_static;
return $this->database->query(
"SELECT
AVG({$s("table_name_values")}.{$s("column_values_value")}) AS {$s("column_values_value")},
MIN({$s("table_name_values")}.{$s("column_values_reading_id")}) AS {$s("column_values_reading_id")},
MIN(COALESCE(
{$s("table_name_metadata")}.{$s("column_metadata_recordedon")},
{$s("table_name_metadata")}.{$s("column_metadata_storedon")}
)) AS datetime
FROM {$s("table_name_values")}
JOIN {$s("table_name_metadata")} ON
{$s("table_name_metadata")}.{$s("column_metadata_id")} = {$s("table_name_values")}.{$s("column_values_reading_id")}
WHERE
{$s("table_name_metadata")}.{$s("column_metadata_device_id")} = :device_id AND
{$s("table_name_values")}.{$s("column_values_reading_type")} = :reading_type AND
COALESCE(
{$s("table_name_metadata")}.{$s("column_metadata_recordedon")},
{$s("table_name_metadata")}.{$s("column_metadata_storedon")}
) >= :start_datetime AND
COALESCE(
{$s("table_name_metadata")}.{$s("column_metadata_recordedon")},
{$s("table_name_metadata")}.{$s("column_metadata_storedon")}
) <= :end_datetime
GROUP BY CEIL(UNIX_TIMESTAMP(COALESCE(
{$s("table_name_metadata")}.{$s("column_metadata_recordedon")},
{$s("table_name_metadata")}.{$s("column_metadata_storedon")}
)) / :average_seconds);", [
"device_id" => $device_id,
"reading_type" => $type_id,
"start_datetime" => $start->format(\DateTime::ISO8601),
"end_datetime" => $end->format(\DateTime::ISO8601),
"average_seconds" => $average_seconds
]
)->fetchAll();
}
public function get_recent_readings(int $device_id, int $type_id, int $count) {
if($count <= 0) return [];
$s = $this->get_static;
return $this->database->query(
"SELECT
AVG({$s("table_name_values")}.{$s("column_values_value")}) AS {$s("column_values_value")},
MIN({$s("table_name_values")}.{$s("column_values_reading_id")}) AS {$s("column_values_reading_id")},
MIN(COALESCE(
{$s("table_name_metadata")}.{$s("column_metadata_recordedon")},
{$s("table_name_metadata")}.{$s("column_metadata_storedon")}
)) AS datetime
FROM {$s("table_name_values")}
JOIN {$s("table_name_metadata")} ON
{$s("table_name_metadata")}.{$s("column_metadata_id")} = {$s("table_name_values")}.{$s("column_values_reading_id")}
WHERE
{$s("table_name_metadata")}.{$s("column_metadata_device_id")} = :device_id AND
{$s("table_name_values")}.{$s("column_values_reading_type")} = :reading_type
ORDER BY COALESCE(
{$s("table_name_metadata")}.{$s("column_metadata_recordedon")},
{$s("table_name_metadata")}.{$s("column_metadata_storedon")}
)
LIMIT :count;", [
"device_id" => $device_id,
"reading_type" => $type_id,
"count" => $count
]
)->fetchAll();
}
}