[英]OrderBy query Php doesn't work after adding LIMIT
I guess my problem is just about a syntax error or SORT BY should come before LIMIT, anyway after adding LIMIT to my query the following statement generates an mysql error. 我想我的问题只是语法错误或SORT BY应该在LIMIT之前出现,无论如何在将LIMIT添加到我的查询中之后,以下语句会生成mysql错误。
$query_pag_data = "SELECT * FROM Apartment LIMIT $start, $per_page";// without LIMIT the if statement works while with LIMIT it doesn't.
if ($_GET['SortBy']=="Price" || $_GET['SortBy']=="District" ||) {
$query_pag_data .= "ORDER BY ".$_GET['SortBy']; // It doesn't work if I add LIMIT to my query
}
What is the error and how can I make this working with LIMIT and ORDER BY wout changing my logic. 这是什么错误,我如何才能在不更改逻辑的情况下使用LIMIT和ORDER BY进行操作。
this will work 这会工作
if ($_GET['SortBy']=="Price" || $_GET['SortBy']=="District") {
$query_order_by= " ORDER BY ".$_GET['SortBy'];
}
$query_pag_data = "SELECT * FROM Apartment $query_order_by LIMIT $start, $per_page";
Your completed SQL should read like SELECT, FROM, ORDER BY, LIMIT
. 完成的SQL应该看起来像SELECT, FROM, ORDER BY, LIMIT
。 So your PHP should be written like: 因此,您的PHP应该写为:
$query_pag_data = "SELECT * FROM Apartment";
if ($_GET['SortBy']=="Price" || $_GET['SortBy']=="District") {
$query_pag_data .= " ORDER BY ".$_GET['SortBy'];
}
$query_pag_data .= " LIMIT $start, $per_page"
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