Question

我正在制作一个非常简单的拍卖网站，我想让用户在他们已经是最高出价者时对某个项目进行出价，我想让该项目不被显示。

我有一张名为bidhistory的表格，用于存储投标人的收益。我在下面的内容是我用来阻止用户对自己的项目进行出价的内容。从bidhistory表中选择的正确语法是什么？我希望我足够清楚。

$sql="SELECT * FROM biditems WHERE NOT accountid = $accountid";

我的更多代码：

$accountid=$_SESSION['accountid'];

$sql=" SELECT * FROM biditems WHERE NOT accountid = $accountid";

$result=mysql_query($sql);

echo "Items for Auction";
$expireDay=new DateTime('2015-07-19 20:12:50');
$theDay=new DateTime('now');
$timeToEnd=$expireDay->diff($theDay);
echo $timeToEnd->format('%R%a days');

while($row=mysql_fetch_array($result)) {
$itemid=$row['itemid'];
$item=$row['biditem'];
$auctionby=$row['username'];
$description=$row['biddesc'];

echo "<ul>";
echo "<li>$item auctioned off by $auctionby. <br> Description: $description
<br> 
<a href='acceptbid.php?itemid=$itemid&item=$item'>Place bid</a></li>";
echo "</ul>";
}
?>

这是我的桌子。

$sql = "CREATE TABLE account (
accountid INT(100) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
username VARCHAR(30) NOT NULL,
password VARCHAR(30) NOT NULL
)";

$sql = "CREATE TABLE biditems (
itemid INT(100) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
accountid INT(100),
biditem VARCHAR(30) NOT NULL,
biddesc tinytext,
dateadded DATETIME
)";

$sql = "CREATE TABLE bidhistory (
bidhistoryid INT(100) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
accountid INT(100),
biditemid INT,
bidprice INT NOT NULL,
biddate DATETIME 
)";

Answer 1

注意：

您想要列出所有要出价的项目，但是您不希望用户对自己的项目出价？我们可以做的是获取所有出价项目，然后在if() else()内查看基本while loop()对帐单，以检查每个项目是否由用户拍卖。
如果您在accountid表中使用username {<1>}（拍卖）会更容易，这样我们就可以将此表连接到{ {1}}表格在索引方面更快更容易。尽管如此，我们仍然可以使用biditems使用account列将INNER JOIN表连接到您的biditems表（希望用户名都是唯一的 ）。

你可以使用它：

account

确保您的username文件中的查询仍然检查他们正在查看的项目是否未被用户拍卖。
同样，请不要使用$sql=" SELECT a.itemid, a.biditem, a.biddesc, b.accountid, b.username FROM biditems a INNER JOIN account b ON a.username = b.username"; /* THE QUERY ABOVE WILL FETCH ALL BID ITEMS */ $result=mysql_query($sql); /* EXECUTE THE QUERY */ echo "Items for Auction"; $expireDay=new DateTime('2015-07-19 20:12:50'); $theDay=new DateTime('now'); $timeToEnd=$expireDay->diff($theDay); echo $timeToEnd->format('%R%a days'); while($row=mysql_fetch_array($result)) { $itemid=$row['itemid']; $item=$row['biditem']; $auctionby=$row['username']; $description=$row['biddesc']; $auctionbyid = $row['accountid']; /* accountid OF THE AUCTION-ER */ $result2 = mysql_query($con,"SELECT accountid FROM bidhistory WHERE biditem = '$itemid' ORDER BY bidhistoryid DESC LIMIT 1"); while($row2 = mysql_fetch_array($result2)){ $checkauctionid = $row2['accountid']; } echo ' <ul> <li>'.$item.' auctioned off by '.$auctionby.'<br> Description: '.$desription.'<br>'; if($accountid != $auctionbyid && $accountid != $checkauctionid){ /* IF THE ITEM IS NOT AUCTIONED BY THE USER OR HE/SHE WAS NOT THE HIGHEST BIDDER */ echo '<a href="acceptbid.php?itemid='.$itemid.'&item='.$item.'">Place bid</a></li>'; } /* END OF IF $accountid IS NOT THE SAME WITH $actionbyid */ else { /* ELSE, IT MEANS THAT THIS ITEM IS HIS/HERS, SO HE/SHE CANNOT BID ON HIS/HER OWN ITEM OR THAT HE IS THE HIGHEST BIDDER FOR THIS ITEM */ echo 'Cannot Place Bid'; } /* END OF ELSE */ echo '</ul>'; } /* END OF WHILE LOOP */ API，因为它已经deprecated。

PHP从两个不同的表中选择*？

1 个答案:

注意：