10. hierarchyid 8

CREATE TABLE Renewable_Energy_Devices (
    device_id NVARCHAR(26) PRIMARY KEY,
    device_status INT CHECK (device_status >= 0 AND device_status <= 6),
    device_power DECIMAL(18,0),
    company_id INT,
    device_location GEOGRAPHY,
    device_location_geom GEOMETRY,
    device_hierarchy HIERARCHYID,
    device_description XML
);


DECLARE @latitude DECIMAL(9, 6), @longitude DECIMAL(9, 6);
DECLARE @point GEOMETRY;
DECLARE @device_hierarchy HIERARCHYID;
DECLARE @device_description XML;

DECLARE @i INT = 1;
WHILE @i <= 50
BEGIN
    SET @latitude = RAND() * 180 - 90;
    SET @longitude = RAND() * 360 - 180;
    SET @point = GEOMETRY::Point(@latitude, @longitude, 4326);

    -- Tworzenie hierarchii z użyciem losowej wartości dodanej do korzenia
    SET @device_hierarchy = HIERARCHYID::GetRoot().GetDescendant(NULL, NULL);

    SET @device_description = '<description>Device_' + CAST(@i AS NVARCHAR(5)) + '</description>';

    INSERT INTO Renewable_Energy_Devices (device_id, device_status, device_power, company_id, device_location, device_location_geom, device_hierarchy, device_description)
    VALUES (
        'Device_' + CAST(@i AS NVARCHAR(5)),
        CAST(RAND() * 6 AS INT),
        CAST(RAND() * 1000 AS DECIMAL(18, 0)),
        CAST(RAND() * 10 AS INT) + 1,
        GEOGRAPHY::Point(@latitude, @longitude, 4326),
        @point,
        @device_hierarchy,
        @device_description
    );

    SET @i = @i + 1;
END;






WITH DeviceHierarchyCTE AS (
    SELECT
        device_id,
        device_hierarchy,
        CAST('/' + device_id + '/' AS NVARCHAR(MAX)) AS hierarchy_path,
        CAST('/' + device_id + '/' AS NVARCHAR(MAX)) AS device_path,
        1 AS hierarchy_level
    FROM
        Renewable_Energy_Devices
    WHERE
        device_hierarchy = HIERARCHYID::GetRoot()

    UNION ALL

    SELECT
        red.device_id,
        red.device_hierarchy,
        dhc.hierarchy_path + red.device_id + '/' AS hierarchy_path,
        dhc.device_path + red.device_id + '/' AS device_path,
        dhc.hierarchy_level + 1
    FROM
        Renewable_Energy_Devices AS red
    INNER JOIN
        DeviceHierarchyCTE AS dhc ON dhc.device_hierarchy.IsDescendantOf(red.device_hierarchy) = 1
)
SELECT
    device_id,
    hierarchy_path,
    device_path,
    hierarchy_level
FROM
    DeviceHierarchyCTE
;