PHP的MySQL查詢臨時表不能正常工作

Question

我正在通過PHP，JavaScript製作一個小型的電子郵件應用程序，並使其工作的大部分。當我試圖設置查詢來獲取被刪除併發送到垃圾箱的電子郵件時，我迷失方向。當我直接查詢數據庫時，我寫的查詢似乎工作正常，但從PHP運行時失敗。請幫助我解決這個令人沮喪的問題，任何幫助將不勝感激。

我的電子郵件表結構如下。

TABLE messages (
    'mid' int, 
    'folderfrom' int, //where message is stored for the user who sent it 
    'msgfrom' text, //user sending message 
    'msgto' text, //user getting message 
    'subject' text, 
    'msgdate' timestamp, 
    'msg' text, 
    'folderto' int, //where message is stored for recieving user. 
) 

以下是我用於構建和執行查詢的代碼。我試過在一行中運行最後一個條件，但它不起作用。

if ($foldernum == 1) { 
    $querytorun = "SELECT ms.mid as 'id', ms.folderto as 'folder', ms.msgfrom as 'name', ms.msgto as 'email', ms.subject as 'subject', ms.msgdate as 'date', ms.msg as 'msg' FROM messages as ms WHERE ms.msgto LIKE '{$usercode}' AND ms.folderto = {$foldernum}"; 
} elseif ($foldernum == 2) { 
    $querytorun = "SELECT ms.mid as 'id', ms.folderfrom as 'folder', ms.msgfrom as 'name', ms.msgfrom as 'email', ms.subject as 'subject', ms.msgdate as 'date', ms.msg as 'msg' FROM messages as ms WHERE ms.msgfrom LIKE '{$usercode}' AND ms.folderfrom = {$foldernum}"; 
} else { 
    $querytorun = "CREATE TEMPORARY TABLE tempfolder('id' int,'folder' int, 'name' text,'email' text,'subject' text,'date' datetime,'msg' text)"; 
    $res = mysql_query($querytorun); 
    $querytorun = "INSERT INTO tempfolder SELECT mst.mid as 'id', mst.folderto as 'folder', mst.msgfrom as 'name', mst.msgto as 'email', mst.subject as 'subject', mst.msgdate as 'date', mst.msg as 'msg' FROM messages as mst WHERE mst.msgto LIKE '{$usercode}' AND mst.folderto = {$foldernum}"; 
    $res = mysql_query($querytorun); 
    $querytorun = "INSERT INTO tempfolder SELECT mst.mid as 'id', mst.folderfrom as 'folder', mst.msgto as 'name', mst.msgfrom as 'email', mst.subject as 'subject', mst.msgdate as 'date', mst.msg as 'msg' FROM messages as mst WHERE mst.msgfrom LIKE '{$usercode}' AND mst.folderfrom = {$foldernum}"; 
    $res = mysql_query($querytorun); 
    $querytorun = "SELECT * FROM tempfolder"; 
} 

$res = mysql_query($querytorun); 

while($rs = mysql_fetch_object($res)) { 
    $arr[] = $rs; 
} 

echo json_encode($arr); 

Answer 1

所以我想通了我自己，我最終將其設置爲一個查詢，而一個臨時表。相反，我做了一個工會所有兩個查詢工作。

$querytorun = "SELECT mst.mid as 'id', mst.folderto as 'folder', mst.msgfrom as 'namefrom', mst.msgto as 'nametoo', mst.subject as 'subject', mst.msgdate as 'date', mst.msg as 'msg' FROM messages as mst WHERE mst.msgto LIKE '{$usercode}' AND mst.folderto = {$foldernum} UNION ALL SELECT mst.mid as 'id', mst.folderfrom as 'folder', mst.msgto as 'nametoo', mst.msgfrom as 'namefrom', mst.subject as 'subject', mst.msgdate as 'date', mst.msg as 'msg' FROM messages as mst WHERE mst.msgfrom LIKE '{$usercode}' AND mst.folderfrom = {$foldernum}"; 

Answer 2

嘗試使用反引號代替單引號。

CREATE TEMPORARY TABLE tempfolder(`id` int,`folder` int, `name` text,`email` text,`subject` text,`date` datetime,`msg` text) 

Answer 3

$querytorun="CREATE TEMPORARY TABLE tempfolder('mid' int, 
    'folderfrom' int, //where message is stored for the user who sent it 
    'msgfrom' text, //user sending message 
    'msgto' text, //user getting message 
    'subject' text, 
    'msgdate' timestamp, 
    'msg' text 
)"; 
mysql_query($querytorun); 
if ($foldernum == 1) { 
    $querytorun = "SELECT ms.mid as 'id', ms.folderto as 'folder', ms.msgfrom as 'name', ms.msgto as 'email', ms.subject as 'subject', ms.msgdate as 'date', ms.msg as 'msg' FROM messages as ms WHERE ms.msgto LIKE '{$usercode}' AND ms.folderto = {$foldernum}"; 
} elseif ($foldernum == 2) { 
    $querytorun = "SELECT ms.mid as 'id', ms.folderfrom as 'folder', ms.msgfrom as 'name', ms.msgfrom as 'email', ms.subject as 'subject', ms.msgdate as 'date', ms.msg as 'msg' FROM messages as ms WHERE ms.msgfrom LIKE '{$usercode}' AND ms.folderfrom = {$foldernum}"; 
} else { 
    $querytorun = "CREATE TEMPORARY TABLE tempfolder('id' int,'folder' int, 'name' text,'email' text,'subject' text,'date' datetime,'msg' text)"; 
    $res = mysql_query($querytorun); 
    $querytorun = "INSERT INTO tempfolder SELECT mst.mid as 'id', mst.folderto as 'folder', mst.msgfrom as 'name', mst.msgto as 'email', mst.subject as 'subject', mst.msgdate as 'date', mst.msg as 'msg' FROM messages as mst WHERE mst.msgto LIKE '{$usercode}' AND mst.folderto = {$foldernum}"; 
    $res = mysql_query($querytorun); 
    $querytorun = "INSERT INTO tempfolder SELECT mst.mid as 'id', mst.folderfrom as 'folder', mst.msgto as 'name', mst.msgfrom as 'email', mst.subject as 'subject', mst.msgdate as 'date', mst.msg as 'msg' FROM messages as mst WHERE mst.msgfrom LIKE '{$usercode}' AND mst.folderfrom = {$foldernum}"; 
    $res = mysql_query($querytorun); 
    $querytorun = "SELECT * FROM tempfolder"; 
} 

$res = mysql_query($querytorun); 

while($rs = mysql_fetch_object($res)) { 
    $arr[] = $rs; 
} 

echo json_encode($arr);