简化/加快SQL查询

Question

有没有一种方法可以使此查询更快：

$qur = mysql_query("
 SELECT id, firstname, lastname, 
 (firstname = '$firstname' AND lastname = '$lastname') AS full FROM users 
 WHERE (firstname = '$firstname' AND lastname='$lastname') 
 OR (firstname LIKE '$firstname%' AND lastname LIKE '$lastname%')
 OR firstname LIKE '$firstname%' OR lastname LIKE '$firstname%'
 ORDER BY (firstname = '$firstname' AND lastname='$lastname') DESC");

我需要的是：

Check if its a full match.
Get firstname lastname
Being able to only enter lastname "Fox" and let it find the firstname (get all users with lastname Fox, and show their firstname too and display check the script at bottom.)
Being able to only enter the firstname "Megan" and let it find the lastname (^)
Being able to only enter Megan F, and let it show "Megan Fox"
Being able to only enter Me Fox, and let it show "Megan Fox"

这就是对我所做的，没有任何问题。 虽然也许我认为当许多用户运行它时运行速度会很慢

我正在使用它：

 if (mysql_num_rows($qur) == 1) {

 $get = mysql_fetch_array($qur);
    if($get["full"] == 1){
    echo $get["id"];
    }else{
     echo "Did you mean: ".$get["firstname"]." ".$get["lastname"]." ?";
    }
 }elseif(mysql_num_rows($qur) > 1){
    while($get = mysql_fetch_array($qur)) {
       $name[] = $get["firstname"]." ".$get["lastname"];
   }

   if(count($name) > 1) {
       echo 'Who did you mean?<br>';
   } else {
       echo 'Did you mean: ';
   }
   echo implode('<br>', $name);

 } 

Answer 1

研究lucene （和这里 ）。 这样会使相关查询更容易使用。

Answer 2

您可以将查询缩短为：

$qur = mysql_query(
"SELECT id, firstname, lastname, 
 (firstname = '$firstname' AND lastname = '$lastname') AS full FROM users 
 WHERE firstname LIKE '$firstname%' AND lastname LIKE '$lastname%' 
 ORDER BY (firstname = '$firstname' AND lastname='$lastname') DESC");

LIKE '...%'在这里适用于所有情况。 但是除此之外，也许您应该研究MyISAM的FULLTEXT搜索 ，这可能会产生更好的结果。

PS：希望您在将$firstname和$lastname插入查询之前，先将其逃脱！

Answer 3

SQL与您的描述不匹配，因为输入OR firstname LIKE '$firstname%'足以满足条件，当输入“ Megan”和“ F” ist时，SQL也会找到Megan McAllister。

您的描述将转换为SQL，如下所示：

WHERE firstname LIKE '$firstname%' AND lastname LIKE '$lastname%'

我认为您必须将“完全匹配”逻辑放在另一个SQL中，或者您必须突破循环/在第一遍中遍历结果以检查它是否完全匹配。 想的情况时，有一个巨型狐狸和Megana狡猾：您将获得两行， 虽然全场比赛。

这是“完全匹配”逻辑的建议：

unset($name); unset($id);

while ($get = mysql_fetch_array($qur))
{
    $name []= $get["firstname"]." ".$get["lastname"];
    if ($get['full'])
    {
        $id = $get['id'];
        break;
    }
}

if ($id)
    echo $id;
elseif ($name)
    echo implode('<br>', $name);
else
    echo 'Nothing found';