我有一个只有一个字段的搜索,它允许我在 MySQL 表的多个列中进行搜索。
这是 SQL 查询:
SELECT td__user.*
FROM td__user LEFT JOIN td__user_oauth ON td__user.id = td__user_oauth.user_id
WHERE ( td__user.id LIKE "contact@mywebsite.com" OR (MATCH (email, firstname, lastname) AGAINST (+"contact@mywebsite.com" IN BOOLEAN MODE)) )
ORDER BY date_accountcreated DESC LIMIT 20 OFFSET 0
使用 PHP 预处理搜索字段以分隔每个单词的精确 SQL 查询:
if($_POST['search'] == '') {
$searchId = '%';
} else {
$searchId = $_POST['search'];
}
$searchMatch = '';
foreach($arrayWords as $word) {
$searchMatch .= '+"'.$word.'" ';
}
$sqlSearch = $dataBase->prepare('SELECT td__user.*,
td__user_oauth.facebook_id, td__user_oauth.google_id
FROM td__user
LEFT JOIN td__user_oauth ON td__user.id = td__user_oauth.user_id
WHERE (
td__user.id LIKE :id OR
(MATCH (email, firstname, lastname) AGAINST (:match IN BOOLEAN MODE)) )
ORDER BY date_accountcreated DESC LIMIT 20 OFFSET 0);
$sqlSearch->execute(['id' => $searchId,
'match' => $searchMatch]);
$searchResult = $sqlSearch->fetchAll();
$sqlSearch->closeCursor();
SQL 查询运行良好,当我在搜索字段中输入 ID 或名字或姓氏,或者电子邮件甚至不完整时,我都会得到结果。我还可以在我的搜索字段中输入名字和姓氏,我只会搜索到具有此名字的人。
另一方面,在包含 500,000 个联系人的表中,查询需要超过 5 秒。为了加快查询速度,在查询或索引方面是否有任何可能的改进点?
最佳答案
您是否尝试在“WHERE”子句中使用“UNION”2 组结果而不是使用“OR”运算符?因为我就是怕索引不能用“或”运算符。
查询将是这样的:
SELECT td__user.*,
td__user_oauth.facebook_id,
td__user_oauth.google_id
FROM td__user
LEFT JOIN td__user_oauth ON td__user.id = td__user_oauth.user_id
WHERE td__user.id LIKE :id
UNION
SELECT td__user.*,
td__user_oauth.facebook_id,
td__user_oauth.google_id
FROM td__user
LEFT JOIN td__user_oauth ON td__user.id = td__user_oauth.user_id
WHERE MATCH (email, firstname, lastname) AGAINST (:match IN BOOLEAN MODE))
ORDER BY date_accountcreated DESC LIMIT 20 OFFSET 0
希望对您有所帮助!
关于php - 优化 MySQL 全文搜索,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58446456/