Question

搜索一个单词非常有效。我想有两个或更多的单词也可以。

到目前为止，我已经做到了这一点，如果我搜索多个单词，结果就是这样：

SELECT id, title, tag, type 
FROM table WHERE **AND** p.id LIKE '%flower%' OR title LIKE '%flower%' OR tag LIKE '%flower%' OR type LIKE '%flower%' 
AND p.id LIKE '%floral%' OR title LIKE '%floral%' OR tag LIKE '%floral%' OR type LIKE '%floral%' 
ORDER BY title

如何正确使用 AND ，以便在有多个单词搜索时，我的代码中没有额外的AND。

有更有效的方法吗？

if (count($error) < 1) {
  $searchSQL = "SELECT id, title, tag, type     
                FROM table
                WHERE ";

 $searcheach = explode(" ", $searchTerms);

foreach($searcheach as $searchword) {

//if more than one word do this else do that
 if(strpos(trim($searchTerms), ' ') !== false) {
     $searchSQL .= "AND p.id LIKE '%{$searchword}%' 
                OR title LIKE '%{$searchword}%'
                OR tag LIKE '%{$searchword}%'
                OR type LIKE '%{$searchword}%' ";
     } 
     else {
         $searchSQL .= "p.id LIKE '%{$searchword}%' 
                OR title LIKE '%{$searchword}%'
                OR tag LIKE '%{$searchword}%'
                OR type LIKE '%{$searchword}%' ";
         }  

}
$searchSQL .= "ORDER BY title";

Answer 1

$words = explode(' ', $searchTerms);

$clauses = array()
foreach($words as $word) {
    $safeword = mysql_real_escape_string($word);
    $clauses[] = "(p.id LIKE '%{$safeword}%' OR title LIKE '%{$safeword} OR etc... )";
}
$clause = implode(' AND ', $clauses);

$sql = "SELECT ... WHERE $clause ORDER BY title";

Answer 2

我宁愿做

$searchSQL = "SELECT id, title, tag, type     
            FROM table
            WHERE (1=1)";

现在，您可以在每个条件

之前始终添加AND

此外，看起来你错过了括号，我相信它应该是

$searchSQL .= "AND (p.id LIKE '%{$searchword}%' 
            OR title LIKE '%{$searchword}%'
            OR tag LIKE '%{$searchword}%'
            OR type LIKE '%{$searchword}%') "

Answer 3

我通常使用1 = 1过滤器，这样当搜索多个单词时，sql将是：

SELECT id, title, tag, type 
  FROM table 
  WHERE 1=1 
    AND p.id LIKE '%flower%' 
    OR title LIKE '%flower%' 
    OR tag LIKE '%flower%' 
    OR type LIKE '%flower%' 
    AND p.id LIKE '%floral%' 
    OR title LIKE '%floral%' 
    OR tag LIKE '%floral%' 
    OR type LIKE '%floral%' 
  ORDER BY title

这样做的代码是：

if (count($error) < 1) {
  $searchSQL = "SELECT id, title, tag, type     
                FROM table
                WHERE 1=1";

 $searcheach = explode(" ", $searchTerms);

foreach($searcheach as $searchword) {

//if more than one word do this else do that
 if(strpos(trim($searchTerms), ' ') !== false) {
     $searchSQL .= " AND p.id LIKE '%{$searchword}%' 
                OR title LIKE '%{$searchword}%'
                OR tag LIKE '%{$searchword}%'
                OR type LIKE '%{$searchword}%' ";
     } 
     else {
         $searchSQL .= "p.id LIKE '%{$searchword}%' 
                OR title LIKE '%{$searchword}%'
                OR tag LIKE '%{$searchword}%'
                OR type LIKE '%{$searchword}%' ";
         }  

}
$searchSQL .= "ORDER BY title";

Answer 4

我倾向于将所有术语构建为数组，然后使用implode：

foreach($searcheach as $searchword) {
    $sqlSearchTerms[] = "p.id LIKE '%{$searchword}%' 
     OR title LIKE '%{$searchword}%'
     OR tag LIKE '%{$searchword}%'
     OR type LIKE '%{$searchword}%' ";
}

$searchSQL .= implode(' AND ', $sqlSearchTerms);

php代码没有按照我想要的搜索功能的方式工作

4 个答案: