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我目前正在嘗試更新我的內部搜索引擎以使用多個單詞。這是非常龐大而複雜的，但我遇到了現在從未遇到過的錯誤，我不知道爲什麼。巨大的SQL查詢返回錯誤（mysql）
所以問題是，爲什麼我收到下面的錯誤？
我將把它分成不同的部分以便更好地理解。
這僅僅是一個SQL查詢我echo d，複製並粘貼到PHPMyAdmin中，粘貼在這裏（的phpMyAdmin格式化好聽），它搜索2個詞語的數據庫：
SELECT *
FROM (
SELECT p.page_url AS url, COUNT(*) AS occurrences
FROM PAGE p, word w, occurrence o
WHERE (
(
p.page_id = o.page_id
AND w.page_word_id = o.page_word_id
AND w.word_word LIKE '%' 'test' '%'
GROUP BY p.page_id
)
OR (
p.page_id = o.page_id
AND w.page_word_id = o.page_word_id
AND w.word_word LIKE '%' 'search' '%'
GROUP BY p.page_id
)
UNION (
SELECT f.file_url AS url, COUNT(*) AS occurrences
FROM files f, filenames fn, fileoccurrence fo
WHERE f.file_id = fo.file_id
AND fn.file_word_id = fo.file_word_id
AND fn.file_word LIKE '%' 'test' '%'
GROUP BY f.file_id
)
OR (
SELECT f.file_url AS url, COUNT(*) AS occurrences
FROM files f, filenames fn, fileoccurrence fo
WHERE f.file_id = fo.file_id
AND fn.file_word_id = fo.file_word_id
AND fn.file_word LIKE '%' 'search' '%'
GROUP BY f.file_id
)
)t
ORDER BY occurrences DESC
此代碼是由生產下面從搜索輸入
// Do a little formatting
$keyword = strtolower($keyword);
// Get timestamp for start
$start_time = microtime(true);
$searched_words = explode(' ', $keyword);
foreach ($searched_words as $index => $word) {
// Set up the stemmer
$stemmer = new PorterStemmer;
$stemmed_string = $stemmer->stem($word);
$searched_words[$index] = $stemmed_string;
}
// Configure the sql code
$sql = "SELECT * FROM (SELECT p.page_url AS url, COUNT(*) AS occurrences
FROM page p, word w, occurrence o WHERE (";
// Add the extra words to the sql
foreach ($searched_words as $index => $word) {
$sql .= "(p.page_id = o.page_id AND w.page_word_id = o.page_word_id
AND w.word_word LIKE '%' '" . $word . "' '%' GROUP BY p.page_id) OR";
}
// Add the union to the sql and then add the second query
$sql = substr($sql, 0, (strLen($sql)-3)); //this will eat the last OR
$sql .= " UNION ";
// The second set of querys
foreach ($searched_words as $index => $word) {
$sql .= "(SELECT f.file_url AS url, COUNT(*) AS occurrences FROM files f, filenames fn, fileoccurrence fo
WHERE f.file_id = fo.file_id AND fn.file_word_id = fo.file_word_id AND fn.file_word
LIKE '%' '" . $word . "' '%' GROUP BY f.file_id) OR";
}
// Clsoe the sql code
$sql = substr($sql, 0, (strLen($sql)-3)); //this will eat the last OR
$sql .= ") t ORDER BY occurrences DESC"; // LIMIT " . $results . "");
// echo the query for the pure lolz of it
echo $sql . "<br /><br />";
// Search the DB for the results
$results = mysql_query($sql)
or die("Invalid query: " . mysql_error());
所有這一切都使用爆炸功能的PHP代碼返回錯誤：
Invalid query: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'GROUP BY p.page_id) OR(p.page_id = o.page_id AND w.page_word_id = o.page_word_id' at line 3
爲什麼我收到此錯誤？我以前使用的代碼工作正常。我添加的唯一真實的東西是foreach()。
這是我原來的SQL代碼：
$result = mysql_query("SELECT * FROM (SELECT p.page_url AS url, COUNT(*) AS occurrences
FROM page p, word w, occurrence o WHERE p.page_id = o.page_id AND w.page_word_id = o.page_word_id
AND w.word_word LIKE '%' '" . $stemmed_string . "' '%' GROUP BY p.page_id UNION
SELECT f.file_url AS url, COUNT(*) AS occurrences FROM files f, filenames fn, fileoccurrence fo
WHERE f.file_id = fo.file_id AND fn.file_word_id = fo.file_word_id AND fn.file_word
LIKE '%' '" . $stemmed_string . "' '%' GROUP BY f.file_id) t ORDER BY occurrences DESC") // LIMIT " . $results . "")
or die("Invalid query: " . mysql_error());
編輯：修正了上述錯誤。與此代碼
// Configure the sql code
$sql = "SELECT * FROM (SELECT p.page_url AS url, COUNT(*) AS occurrences
FROM page p, word w, occurrence o WHERE (";
// Add the extra words to the sql
foreach ($searched_words as $index => $word) {
$sql .= "(p.page_id = o.page_id AND w.page_word_id = o.page_word_id
AND w.word_word LIKE CONCAT('%', '" . $word . "', '%'))) OR "; //GROUP BY p.page_id)
}
// Add the union to the sql and then add the second query
$sql = substr($sql, 0, (strLen($sql)-4)); //this will eat the last OR
$sql .= " GROUP BY p.page_id)";
$sql .= " UNION ";
$sql .= "(SELECT f.file_url AS url, COUNT(*) AS occurrences FROM files f, filenames fn, fileoccurrence fo
WHERE (";
// The second set of querys
foreach ($searched_words as $index => $word) {
$sql .= "(f.file_id = fo.file_id AND fn.file_word_id = fo.file_word_id AND fn.file_word
LIKE CONCAT('%', '" . $word . "', '%'))) OR "; //GROUP BY f.file_id)
}
// Clsoe the sql code
$sql = substr($sql, 0, (strLen($sql)-4)); //this will eat the last OR
$sql .= " GROUP BY f.file_id)";
$sql .= ") t ORDER BY occurrences DESC"; // LIMIT " . $results . "");
現在，這會產生錯誤：
Invalid query: Every derived table must have its own alias
其中有事情做與工會（我不是在工會很好..或SQL一般）