Просто интересно, есть ли кто-нибудь, кто может помочь мне понять, почему мой код не выводит данные.Я создал запрос T-SQL в Microsoft SQL Server 2008. Запрос работает нормально и отображает все правильные данные в SQL Management Studio.Ниже показано, как данные выглядят в SQL Server Management studio:
block sequence|number of ties|percent_of_q4|number of q3 ties|percent of q3 ties| quality
0 1108 11.34296 37 3.33935 1
1 1094 31.11517 66 6.032907 1
2 1109 21.633 53 4.77908 1
Когда я пытаюсь вывести данные в простом PHP-скрипте, используя точно такой же запрос, данные не отображаются.
Это происходит потому, что sqlsrv_query не нравится мой запрос?Разве sqlsrv_fetch_array не похож на "IS NOT NULL" в моем запросе?У меня полностью закончились идеи о том, что попробовать ... Кто-нибудь может дать совет, почему этот довольно простой сценарий не работает?Любой ответ будет принята с благодарностью!
Если что-то неясно, пожалуйста, дайте мне знать.
Приветствия, Нил
PHP-скрипт ниже:
<code> <?php
/*data base connection */
$serverName = ".\SQLEXPRESS";
$connectionOptions = array("Database"=>"V6_HOLLTS479_20101015_subset",
"UID"=>"username",
"PWD" => "password");
/* Connect using Windows Authentication */
$conn = sqlsrv_connect($serverName, $connectionOptions);
/* Check whether connnection is established */
if($conn === false)
{
die(print_r(sqlsrv_errors(), true));
}
/* SQL query */
$tsql = "
DECLARE @block_size AS real
DECLARE @threshold_1 AS real
DECLARE @threshold_2 AS real
DECLARE @threshold_3 AS real
DECLARE @threshold_4 AS real
--Set variables
SET @block_size = 200.0
SET @threshold_1 = 50 -- GISCat4HighThresh
SET @threshold_2 = 75 -- GISCat3HighThresh
SET @threshold_3 = 25 -- GISCat4LowThresh
SET @threshold_4 = 50 -- GISCat3LowThresh
SELECT
sub_t.block_sequence ,
sub_t.number_of_ties,
tie_q_4.number_of_ties AS number_of_q4_ties,
(CAST(tie_q_4.number_of_ties AS real)/CAST(sub_t.number_of_ties AS real))*100.0 AS percent_of_q4_ties,
tie_q_3.number_of_ties AS number_of_q3_ties,
(CAST(tie_q_3.number_of_ties AS real)/CAST(sub_t.number_of_ties AS real))*100.0 AS percent_of_q3_ties,
--The next column shows the block quality. This is currently 4,3,1 based on the threshold rules.
CASE WHEN (
(CAST(tie_q_4.number_of_ties AS real)/CAST(sub_t.number_of_ties AS real))*100.0 > @threshold_1
OR
(CAST(tie_q_3.number_of_ties AS real)/CAST(sub_t.number_of_ties AS real))*100.0 > @threshold_2
) THEN 4
WHEN (
(CAST(tie_q_4.number_of_ties AS real)/CAST(sub_t.number_of_ties AS real))*100.0 > @threshold_3
OR
(CAST(tie_q_3.number_of_ties AS real)/CAST(sub_t.number_of_ties AS real))*100.0 > @threshold_4
) THEN 3
ELSE 1
END AS quality
FROM (
SELECT
FLOOR(CAST(image_sequence AS real)/@block_size) AS block_sequence ,
COUNT(image_sequence) AS number_of_ties
FROM database
GROUP BY
FLOOR(CAST(image_sequence AS real)/@block_size)
) AS SUB_T
LEFT JOIN (
SELECT FLOOR(CAST(image_sequence AS real)/@block_size) AS block_sequence ,
COUNT(image_sequence) AS number_of_ties
FROM database
WHERE
quality = 4
GROUP BY
FLOOR(CAST(image_sequence AS real)/@block_size)
) AS tie_q_4 ON sub_t.block_sequence = tie_q_4.block_sequence
LEFT JOIN (
SELECT
FLOOR(CAST(image_sequence AS real)/@block_size) AS block_sequence ,
COUNT(image_sequence) AS number_of_ties
FROM database
WHERE
quality = 3
GROUP BY
FLOOR(CAST(image_sequence AS real)/@block_size)
) AS tie_q_3 ON sub_t.block_sequence = tie_q_3.block_sequence
WHERE sub_t.block_sequence IS NOT NULL
ORDER BY block_sequence
";
$result = sqlsrv_query($conn, $tsql);
$row = sqlsrv_fetch_array($result, SQLSRV_FETCH_ASSOC);
print("<pre>");
print_r($row);
print(" ");