PHP ORDER BY, DESC, LIMIT

Question

我希望得到一些帮助： 我正在尝试输出一个用户可以通过各种选择字段查看和排列的 mysql 数据表。我希望数据自动按日期顺序排列（最新的在前），并且每页限制为 10 个结果。

我有以下脚本摘录（为简洁起见，我已将其截断，如有必要，我很乐意发布更多内容）...

<!-- **** THIS CODE CREATES THE FORM ****-->
<form id="form1" name="form1" method="post" action="deals.php">

<!-- **** THIS CODE IS FOR THE "FROM" DATE ****-->
<label for="from">From</label>
<input name="from" type="text" id="from" size="10" value="<?php echo $_REQUEST["from"]; ?>" />
Results will only show offers that have been listed since this date. Leave blank for all offers.

<!-- **** THIS CODE IS FOR THE "TO" DATE ****-->
</p>
<label for="to">To</label>
<input name="to" type="text" id="to" size="10" value="<?php echo $_REQUEST["to"]; ?>"/>
Results will only show offers that run until this date. Leave blank for all offers.

<label>Country</label>
<select name="country">
<option value="">--Any--</option>
<?php
    $sql = "SELECT * FROM ".$SETTINGS["data_table"]." GROUP BY country ORDER BY country";
    $sql_result = mysql_query ($sql, $connection ) or die ('request "Could not execute SQL query" '.$sql);
    while ($row = mysql_fetch_assoc($sql_result)) {
        echo "<option value='".$row["country"]."'".($row["country"]==$_REQUEST["country"] ? " selected" : "").">".$row["country"]."</option>";
    }
?>
</select>
Only shows offers from the selected country.

// ***************************************** // ******* 为每个变量重复（我真的应该将它设置为一个数组 ************************** ***** // ***********************************************

if ($_REQUEST["from"]<>'' and $_REQUEST["to"]<>'') 
{
$sql = "SELECT * FROM ".$SETTINGS["data_table"]." WHERE from_date >= ' ORDER BY from_date DESC LIMIT 0, 10 ".mysql_real_escape_string($_REQUEST["from"])."' AND to_date <= '".mysql_real_escape_string($_REQUEST["to"])."'".$search_Seller.$search_country.$search_id.$search_Offer.$search_Item.$search_Description.$search_Brand.$search_Was.$search_Now;
}


else if ($_REQUEST["from"]<>'') 
{$sql = "SELECT * FROM ".$SETTINGS["data_table"]." WHERE from_date  >= ' ORDER BY from_date DESC LIMIT 0, 10".mysql_real_escape_string($_REQUEST["from"])."'".$search_Seller.$search_country.$search_id.$search_Offer.$search_Item.$search_Description.$search_Brand;
}


else if ($_REQUEST["to"]<>'') 
{$sql = "SELECT * FROM ".$SETTINGS["data_table"]." WHERE to_date <= ' ORDER BY date_time DESC LIMIT 0, 10".mysql_real_escape_string($_REQUEST["to"])."'".$search_Seller.$search_country.$search_id.$search_Offer.$search_Item.$search_Description.$search_Brand.$search_Was.$search_Now;}

else {$sql = "SELECT * FROM ".$SETTINGS["data_table"]." ORDER BY from_date DESC LIMIT 0, 10  ".$search_Seller.$search_country.$search_id.$search_Offer.$search_Item.$search_Description.$search_Brand.$search_Was.$search_Now;
}

这在输出初始表时效果很好，但是，一旦用户输入任何数据，我就会收到错误

"request "Could not execute SQL query" SELECT * FROM newoffers ORDER BY from_date DESC LIMIT 0, 10 AND country='UK'"

所以我猜语法有问题？ 我已经尝试重新安排最后一部分，所以它显示为：

else {$sql = "SELECT * FROM ".$SETTINGS["data_table"].  .$search_Seller.$search_country.$search_id.$search_Offer.$search_Item.$search_Description.$search_Brand.$search_Was.$search_Now; "ORDER BY from_date DESC LIMIT 0, 10";
}

结果：解析错误：语法错误，意外'"ORDER BY from_date DESC LIMIT' (T_CONSTANT_ENCAPSED_STRING) in /home/iratebjj/public_html/dealstest.php on line 267

请查看http://www.iratebjj.com/dealstest.php 以查看正在运行的脚本。 如果有人有任何建议，我真的很感激！

谢谢！

希望这篇文章没问题。我想我已经遵守了所有的准则！

Answer 1

这是你的错误

$search_Now; "ORDER BY from_date DESC LIMIT 0, 10";

你应该在$search_Now之后连接"ORDER BY from_date DESC LIMIT 0, 10"并添加一个空格

$search_Now." ORDER BY from_date DESC LIMIT 0, 10"

您还需要在$SETTINGS["data_table"] 之后添加WHERE 1 = 1 条件，因为以下变量似乎以AND 开头：$search_Seller、$search_country、$search_id、$search_Offer、$search_Item、@987654333 @、$search_Brand、$search_Was、$search_Now。

最后一个else块应该如下

else {
    $sql = "SELECT * FROM ".$SETTINGS["data_table"]." WHERE 1 = 1 ";
    $sql .= $search_Seller.$search_country.$search_id.$search_Offer.$search_Item.$search_Description.$search_Brand.$search_Was.$search_Now." ORDER BY from_date DESC LIMIT 0, 10";
}

Answer 2

您的查询格式错误。条件AND country='UK' 应该在WHERE 条件中，而不是在ORDER BY 子句之后

SELECT * 
FROM newoffers 
WHERE country='UK'
ORDER BY from_date DESC 
LIMIT 0, 10;