[英]MySQL WHERE results based on a previous WHERE clause
抱歉,如果有一种简单的Mysql方法可以做到这一点,但是我发现很难说出任何有意义的搜索结果。
我正在搜索我的网站,并且搜索工作正常,直到我尝试通过基于下拉菜单中所选流派的单词来搜索它。
此查询最能代表我要执行的操作:
SELECT *
FROM Books
JOIN bookauthor ON books.BookID = bookauthor.BookID
JOIN authors ON bookauthor.AuthorID = authors.AuthorID
JOIN bookgenre ON books.BookID = bookgenre.BookID
JOIN genre ON bookgenre.GenreID = genre.GenreID
WHERE genre.Genre = 'Fantasy'
WHERE books.BookName LIKE '%$variable%' OR authors.Forename LIKE '%$variable%' OR authors.Surname LIKE '%$variable%'
GROUP BY books.BookName ORDER BY authors.AuthorID
我想选择所有已选择类型的书籍,然后从它们中进行其他检查,因为现在具有OR的功能会覆盖其他检查,并且最终会吐出每条记录。
我猜想我可能必须有一个查询来选择所有类型的书籍,然后运行另一个查询以从该上一个查询中进行选择。 只有我从未做过,我需要将其合并到我的搜索功能中...
这是我当前的搜索代码,与尝试搜索选择了“全部”以外的流派的东西时效果很好,如果您只选择一个流派而不输入任何内容,那么它将显示该流派的书,只是如果您选择还要输入搜索词。
if(isset($_POST['search']))
{
if($_POST['genre']!="All")
{
$where3 = "WHERE genre.GenreID = '".$_POST['genre']."'";
}
if($_POST['field'] == "All")
{
if(str_word_count($_POST['find'])>=2)
{
$findEx = explode(' ', $_POST['find']);
$where2 = "OR authors.Forename LIKE '%".($findEx[0])."%' AND authors.Surname LIKE '%".$findEx[1]."%'";
}
$where = "
WHERE books.BookName LIKE '%".($_POST['find'])."%'
OR authors.Forename LIKE '%".($_POST['find'])."%' OR authors.Surname LIKE '%".($_POST['find'])."%'
$where2
";
}
else if($_POST['field'] == "Books")
{
$where = "WHERE books.BookName LIKE '%".($_POST['find'])."%'";
}
else if($_POST['field'] == "Authors")
{
if(str_word_count($_POST['find'])>=2)
{
$findEx = explode(' ', $_POST['find']);
$where = "WHERE authors.Forename LIKE '%".($findEx[0])."%' AND authors.Surname LIKE '%".$_POST[1]."%'";
}
else
{
$where = "WHERE authors.Forename LIKE '%".($_POST['find'])."%' OR authors.Surname LIKE '%".($_POST['find'])."%'";
}
}
$sql = "SELECT * FROM Books
JOIN bookauthor ON books.BookID = bookauthor.BookID
JOIN authors ON bookauthor.AuthorID = authors.AuthorID
JOIN bookgenre ON books.BookID = bookgenre.BookID
JOIN genre ON bookgenre.GenreID = genre.GenreID
".$where3."
".$where."
GROUP BY books.BookName
ORDER BY authors.AuthorID";
echo $sql;
}
我对这一切仍然很陌生,因此很抱歉,如果我的搜索代码看起来像一场噩梦,尽管可以接受任何提示,但它用最少的代码即可满足我的需求。
感谢所有帮助-汤姆
也许
SELECT *
FROM Books
JOIN bookauthor ON books.BookID = bookauthor.BookID
JOIN authors ON bookauthor.AuthorID = authors.AuthorID
JOIN bookgenre ON books.BookID = bookgenre.BookID
JOIN genre ON bookgenre.GenreID = genre.GenreID
WHERE genre.Genre = 'Fantasy'
AND books.BookName LIKE '%$variable%' (OR authors.Forename LIKE '%$variable%' OR authors.Surname LIKE '%$variable%')
GROUP BY books.BookName ORDER BY authors.AuthorID
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