mysql_query返回值和空值，但應該只有值

我得到了一些空值通過返回我的mysql_query在json記法從PHP。有些領域，比如bookid，名稱，作者，持續時間都是返回值，其他不是！但是我在DBVisualizer中輸入了相同的查詢，而且我只有價值...這裏有什麼問題？mysql_query返回值和空值，但應該只有值

echo $myuserid . "idcheck"; 
    $q1 = "select u.address as address, u.postcode as postcode, u.town as town, u.telnumber, u.mail, b.bookid as bookid, b.name as name, b.author as author, s.duration as duration from status s, book b, user u where s.bookid = b.bookid and s.borroweruserid = u.userid and s.borroweruserid = $myuserid"; 
    echo $q1; 
    $sth = mysql_query($q1) or die(mysql_error()); 

     while($rowla = mysql_fetch_assoc($sth)) { 

    $rows[] = array(
     'address' => $rowla['address'], 
     'postcode' => $rowla['postcode'], 
     'town' => $rowla['town'], 
     'telnumber' => $rowla['telnumber'], 
     'mail' => $rowla['mail'], 
     'bookid' => $rowla['bookid'], 
     'name' => $rowla['name'], 
     'author' => $rowla['author'], 
     'duration' => $rowla['duration']); 
    // 'pic' => base64_encode($row['pic'] 
    //$rows[] = $r; 
     } 
     $j1 = json_encode($rows);

UPDATE：當把error_reporing到PHP腳本沒有什麼作品（不執行查詢），並通過添加的print_r（$ rowla），而後，仍然得到這個反饋（第二查詢在做同樣的 - 只是一個位不同）： http://s24.postimg.org/4wpu29zwl/Screen_Shot_2014_05_22_at_08_45_02.png

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2014-05-22 flyOWX

所以，如果我理解正確的你，如果你DBVisualizer工具中運行'q1'，有顯示沒有空/空值，但裏面'j1'你對某些領域得到空/空值？ – asprin

@asprin，你是對的 – flyOWX

嘗試把'error_reporing（E_ALL）'放在你的php腳本的頂部，看看是否打印任何東西？通知，警告等。 – asprin

你想念你的sql。我認爲。

$q1 = "SELECT u.address AS address, u.postcode AS postcode, u.town AS town, u.telnumber, u.mail, b.bookid AS bookid, b.name AS name, b.author AS author, s.duration AS duration from status s, book b, user u WHERE s.bookid = b.bookid AND s.borroweruserid = u.userid AND s.borroweruserid = '".$myuserid."'";

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2014-05-22 07:07:53 shiro93

mysql_query返回值和空值，但應該只有值

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