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這裏是我檢查id的代碼。我想檢查sesion id是1或2或3.如果它是1,那麼相應的查詢從db中獲取數據並執行。但是在這裏,我有查詢是空的。if else檢查3條語句的條件
<?php
if($_SESSION['id'] =='1')
{
$sql ="select a.`id` 'User ID', a.`username` 'Username',MAX(b.login_timestamp) 'Last Logged',count(*) 'Total No. of logins for the Month', count(*)/30 'Avg no. of Logins /day' from users a left join `client_access_log` b on b.unique_id=a.unique_id where b.`username` in('ghfh','sdd') and
`login_timestamp` between DATE_SUB(DATE_FORMAT(NOW(),'%Y-%m-01'), INTERVAL 1 MONTH) and CAST(DATE_FORMAT(NOW(),'%Y-%m-01') AS DATE) GROUP BY a.id order by count(*) desc";
}
elseif($_SESSION['id'] == '2')
{
$sql ="select a.`id` 'User ID', a.`username` 'Username',MAX(b.login_timestamp) 'Last Logged',count(*) 'Total No. of logins for the Month', count(*)/30 'Avg no. of Logins /day' from users a left join `client_access_log` b on b.unique_id=a.unique_id where b.`username` in('dff') and
`login_timestamp` between DATE_SUB(DATE_FORMAT(NOW(),'%Y-%m-01'), INTERVAL 1 MONTH) and CAST(DATE_FORMAT(NOW(),'%Y-%m-01') AS DATE) GROUP BY a.id order by count(*) desc";
}
elseif($_SESSION['id'] == '3')
{
$sql ="select a.`id` 'User ID', a.`username` 'Username',MAX(b.login_timestamp) 'Last Logged',count(*) 'Total No. of logins for the Month', count(*)/30 'Avg no. of Logins /day' from users a left join `client_access_log` b on b.unique_id=a.unique_id where b.`username` in('wededf') and
`login_timestamp` between DATE_SUB(DATE_FORMAT(NOW(),'%Y-%m-01'), INTERVAL 1 MONTH) and CAST(DATE_FORMAT(NOW(),'%Y-%m-01') AS DATE) GROUP BY a.id order by count(*) desc";
}
$query = mysql_query($sql) or die(mysql_error());
if(!$query)
{
mysql_close();
echo json_encode("There was an error running the query: " . mysql_error());
}
elseif(mysql_num_rows($query)==0)
{
mysql_close();
echo json_encode("No results returned");
exit;
}
else
{
$header = false;
$output_string = "";
$output_string .= "<table border='2'>\n";
while($row = mysql_fetch_assoc($query))
{
if(!$header)
{
$output_string .= "<tr>\n";
foreach($row as $header => $value)
{
$output_string .= "<th>{$header}</th>\n";
}
$output_string .= "</tr>\n";
}
$output_string .= "<tr>\n";
foreach($row as $value)
{
$output_string .= "<th>{$value}</th>\n";
}
$output_string .= "</tr>\n";
}
$output_string .= "</table>\n";
}
mysql_close();
echo json_encode($output_string);
?>
你是否先通過'session_start();' –
開始會話嘗試添加一些調試信息來驗證所有變量是否正確。因此,在ifs之後的ifs和echo $ sql之前,先從'echo $ _SESSION ['id']'開始。這可能會告訴你更多的問題。 – ndsmyter
另外,停止使用'mysql',它已被棄用。使用'mysqli'或'PDO'。 – ElendilTheTall