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我试图通过避免包含相同单词的多个记录来限制我的数据库的大小，因此我已经构建了两个表，用于将关键字与其他行表。mySQL加入三个表并搜索一个表中找到的几个关键字
作为一个例子，我们使用follwing搜索输入：“找到我”
什么愿望去得到一个打击，是的product_id = 106 难道我只是在产品名称搜索PRODUCT_NAME？不可以，因为产品可以与其他关键字关联，而这些关键字不属于product_name的一部分。
表：ec_products
product_id | product_name | is_deleted
---------------------------------------------
106 | some product | 0
表：ec_keywords_index
word_id | keyword
---------------------------------------------
55 | find
61 | my
77 | product
表：ec_keyword_relations
word_id | application_id | related_id
------------------------------------------------
55 | 1 | 106
61 | 1 | 106
77 | 1 | 106
所以，我现在想，当我输入 “找我” 到我的搜索输入是：
- 我只想要命中其中ec_keyword_relations.application_id = 1
- 我的搜索字符串中的所有单词都应该与产品相关。例如。如果我将搜索输入更改为“找到我的裤子”，我们不应该找到product_id = 106.
这是我到目前为止尝试过的（并且我知道我离工作解决方案很远暂且）：
$searchInput = 'find my';
$keywords = explode(' ', $searchInput);
$keyword_count = count($keywords);
$n = 1;
$query = '';
foreach($keywords as $keyword) {
if ($n !== $keyword_count) {
$query_ext = ' AND ';
} else {
$query_ext = '';
}
$query .= "(ec_keywords_index.keyword LIKE '%$keyword%')" . $query_ext;
++$n;
}
$query = "
SELECT
ec_products.product_name
FROM
ec_products
LEFT JOIN ec_search_word_relations
ON ec_keyword_relations.related_id = ec_products.product_id
LEFT JOIN ec_keywords_index
ON ec_keywords_index.word_id = ec_keyword_relations.word_id
WHERE
($query)
AND
ec_products.is_deleted = '0'
AND
ec_keyword_relations.application_id = '1'
GROUP BY
ec_products.product_id
ORDER BY
ec_products.product_name ASC
LIMIT
100";
$stmt = $mysqli->prepare($query);
$stmt->execute();
$stmt->store_result();
$stmt->bind_result($name);
while ($stmt->fetch()) {
echo $name;
}
UPDATE：
经过一番摆弄周围，我想出了这个解决方案预期这只是工作。 （就性能而言）它是一个好的还是坏的解决方案？
$searchInput = 'find my';
$keywords = explode(' ', $searchInput);
$keyword_count = count($keywords);
$n = 1;
$where_query = '';
$having_query = '';
foreach($keywords as $keyword) {
if ($n != $keyword_count) {
$w_query_ext = ' OR ';
$h_query_ext = ' AND ';
} else {
$w_query_ext = '';
$h_query_ext = '';
}
$where_query .= "ec_keywords_index.keyword LIKE '%" . $keyword . "%'" . $w_query_ext;
$having_query .= "related_keywords LIKE '%" . $keyword . "%'" . $h_query_ext;
++$n;
}
$query = "
SELECT
ec_products.product_name,
GROUP_CONCAT(' ', ec_keywords_index.keyword) AS 'related_keywords'
FROM
ec_products,
ec_keywords_index
LEFT JOIN
ec_keyword_relations
ON ec_keyword_relations.word_id = ec_keywords_index.word_id
WHERE ($where_query)
AND ec_products.product_id = ec_keyword_relations.related_id
AND ec_keyword_relations.application_id = '1'
AND ec_products.is_deleted = '0'
GROUP BY
ec_products.product_name
HAVING
($having_query)
LIMIT
100";
$stmt = $mysqli->prepare($query);
$stmt->execute();
$stmt->store_result();
$stmt->bind_result($name);
while ($stmt->fetch()) {
echo $name;
}
上面的例子输出这样的查询：
SELECT
ec_products.product_name,
GROUP_CONCAT(' ', ec_keywords_index.keyword) AS 'related_keywords'
FROM
ec_products,
ec_keywords_index
LEFT JOIN
ec_keyword_relations
ON ec_keyword_relations.word_id = ec_keywords_index.word_id
WHERE (ec_keywords_index.keyword LIKE '%find%' OR ec_keywords_index.keyword LIKE '%my%')
AND ec_products.product_id = ec_keyword_relations.related_id
AND ec_keyword_relations.application_id = '1'
AND ec_products.is_deleted = '0'
GROUP BY
ec_products.product_name
HAVING
(related_keywords LIKE '%find%' AND related_keywords LIKE '%my%')
LIMIT
100
我使用GROUP_CONCAT创建一个包含所有与产品相关的关键字一栏，然后我的WHERE子句仅用来选择在我的搜索字符串中实际找到的关键字...然后使用HAVING子句在使用GROUP_CONCAT的列构建中进行搜索。以实例