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想知道是否有人能夠幫助我理解我的代碼爲什麼不輸出數據。我在Microsoft SQL Server 2008中創建了一個T-SQL查詢。查詢工作正常，並在SQL管理工作室中顯示所有正確的數據。下面是數據的外觀在SQL Server Management Studio中：PHP使用sqlsrv_query顯示T-SQL語句
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
當我試圖輸出使用完全相同的查詢一個簡單的PHP腳本的數據，沒有數據顯示。
發生這種情況是因爲sqlsrv_query不喜歡我的查詢嗎？ sqlsrv_fetch_array是否不像我查詢中的「IS NOT NULL」？我已經完全沒有想法嘗試什麼......任何人都可以提供任何建議，爲什麼這個相當簡單的腳本似乎沒有工作？任何答覆將不勝感激！
如果有什麼不清楚的地方，請告訴我。
乾杯， 尼爾
PHP腳本如下：
<?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("</pre>");