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我有以下代码
public function get_posted_questions($data) {
include dirname(__FILE__) . "/database.php";
$user_db_name = $dbconfig[$data['college_id']]['database'];
if (isset($data['start'])) {
$start = $data['start'];
} else {
$start = 0;
}
if (isset($data['end']) and ! empty($data['end'])) {
$end = $data['end'];
} else {
$end = 30;
}
/*
* multiple college database funda here goes
*/
$max_college_id = "
SELECT DISTINCT college_id
FROM just_ask_question
WHERE
status = '1'
AND isDeleted = '0'
AND college_id !='0'
ORDER BY id DESC
LIMIT $start, $end
";
$max_college_id_run = mysql_query($max_college_id);
$question_data = array();
$question_query = "
SELECT
Q.id,
Q.title,
Q.description,
Q.user_id,
Q.college_id,
Q.datetime,
IFNULL(GROUP_CONCAT(DISTINCT T.name),'') AS tags,
IFNULL(CONCAT_WS(' ',U.firstName,U.lastName),'') AS user_name
IFNULL(U.image,'') AS image,
IFNULL(V.id,'') AS no_of_view,
IFNULL(Vote.upvote,'') AS up_vote,
IFNULL(answer.id,0) AS no_of_answer,
IFNULL(is_upvote,0) AS upvote_status,
category_name
FROM just_ask_question AS Q
LEFT JOIN just_ask_question_tag Qt
ON Qt.question_id = Q.id
LEFT JOIN just_ask_tag T
ON T.id = Qt.tag_id
LEFT JOIN just_ask_category
ON just_ask_category.id = Q.category_id
LEFT JOIN
(
SELECT COUNT(id) as id, question_id FROM just_ask_answer
) AS answer ON answer.question_id = Q.id
";
while ( $row = mysql_fetch_assoc($max_college_id_run) ) {
$user_db_name = $dbconfig[$row['college_id']]['database'];
$question_query .= "
CASE WHEN Q.college_id = '".$row['college_id']."'
THEN LEFT JOIN $user_db_name.users U ON U.id = Q.user_id
";
}
$question_query .= "
LEFT JOIN
(
SELECT count(id) AS id, question_id FROM just_ask_view
) AS V ON V.question_id = Q.id
LEFT JOIN
(
SELECT
COUNT(upvote) as upvote,
question_id
FROM just_ask_upvote_downvote
WHERE upvote = '1' AND is_question = '1'
GROUP BY question_id
) AS Vote
ON Vote.question_id = Q.id
LEFT JOIN
(
SELECT
IF(COUNT(id) > 0,1,0) AS is_upvote,
question_id
FROM just_ask_upvote_downvote
WHERE
upvote = '1'
AND college_id = '" . $data['college_id'] . "'
AND user_id = '" . $data['user_id'] . "'
AND is_question = '1'
) AS Is_Vote
ON Is_Vote.question_id = Q.id
WHERE
Q.status = '1'
AND Q.isDeleted = '0'
AND CASE
WHEN Q.visibility = 0 AND Q.college_id != 0 THEN Q.college_id = '" . $data['college_id'] . "'
ELSE true
END
";
if (!empty($data['search_text'])) {
$search_text = $data['search_text'];
$question_query .= " and (Q.title like '%$search_text%' or Q.description like '%$search_text%' or T.name like '%$search_text%')";
}
$question_query .= " group by Q.id order by Q.id desc limit $start,$end";
$question_query_run = mysql_query($question_query);
/* get weather question exist */
$check_num_rows = mysql_num_rows($question_query_run);
if ($check_num_rows > 0) {
while ($row = mysql_fetch_assoc($question_query_run)) {
if ($row['image'] != '') {
$row['thumbnail'] = USER_THUMBNAIL_URL . $row['image'];
$row['image'] = IMAGE_URL . $row['image'];
} else
$row['thumbnail'] = '';
$question_data[] = $row;
}
$status['statuscode'] = "1";
$status['statusmessage'] = "ok";
$status['question_data'] = $question_data;
$response['response'] = $status;
echo json_encode($response);
die();
}else {
$status['statuscode'] = "2";
$status['statusmessage'] = "There is no record found";
$response['response'] = $status;
echo json_encode($response);
die();
}
}
以及数据库配置文件,其中包含数据库名称信息就像
$dbconfig['1'] = array(
'host' => 'localhost',
'user_name' => 'root',
'password' => 'test123*',
'database' => 'staging_myuniversity'
);
$dbconfig['2'] = array(
'host' => 'localhost',
'user_name' => 'root',
'password' => 'test123*',
'database' => 'staging_myuniversity_dias'
);
数据库驻留在同一服务器上并具有完全权限。
查询像这样生成
select Q.id,Q.title,Q.description,Q.user_id,Q.college_id,
Q.datetime,
ifnull(group_concat(distinct T.name),'') as tags,
ifnull(CONCAT_WS(' ',
U.firstName,U.lastName),'') as user_name,
ifnull(U.image,
'') as image,ifnull(V.id,'') as no_of_view,
ifnull(Vote.upvote,
'') as up_vote,
ifnull(answer.id,0) as no_of_answer,
ifnull(is_upvote,
0
) as upvote_status,
category_name
from just_ask_question as Q
left join just_ask_question_tag Qt on Qt.question_id = Q.id
left join just_ask_tag T on T.id = Qt.tag_id
left join just_ask_category on just_ask_category.id = Q.category_id
left join
( SELECT count(id) as id,question_id
from just_ask_answer
) as answer on answer.question_id = Q.id case when Q.college_id = '1' then
left join staging_myuniversity.users U on U.id = Q.user_id case when Q.college_id = '12'then
left join campify_solutions_mathura.users U on U.id = Q.user_id case when Q.college_id = '4' then
left join staging_myuniversity_nit_kkr.users U on U.id = Q.user_id case when Q.college_id = '2' then
left join staging_myuniversity_dias.users U on U.id = Q.user_id
left join
( SELECT count(id) as id,question_id
from just_ask_view
) as V on V.question_id = Q.id
left join
( SELECT count(upvote) as upvote,question_id
from just_ask_upvote_downvote
where upvote = '1'
and is_question = '1'
group by question_id
) as Vote on Vote.question_id = Q.id
left join
( SELECT if(count(id) > 0,1,0) as is_upvote,question_id
from just_ask_upvote_downvote
where upvote = '1'
and college_id = '1'
and user_id = '1'
and is_question = '1'
) as Is_Vote on Is_Vote.question_id = Q.id
where Q.status = '1'
and Q.isDeleted = '0'
and case when Q.visibility = 0
and Q.college_id != 0 then Q.college_id = '1' else true end
group by Q.id
order by Q.id desc
limit 0,30
我需要根据大学ID连接不同的数据库首先我从问题中获取不同的大学 ID,然后进行循环对于大学 ID 并尝试制定加入条件,但我收到错误,有任何建议和帮助
最佳答案
我不会帮助您完成整个查询(我只会列出一些问题),但是这个“case-join”可以通过这样的 UNION ALL
子查询来解决:
INNER JOIN (
SELECT 1 AS college_id, id, firstName, lastName, image
FROM staging_myuniversity.users
UNION ALL
SELECT 12 AS college_id, id, firstName, lastName, image
FROM campify_solutions_mathura.users
UNION ALL
...
) AS U ON U.college_id = Q.college_id AND U.id = Q.user_id
SELECT count(), some_id
)连接时,也使用 GROUP_BY some_id
。否则,您将计算表中的所有行,并仅针对一个(第一个/随机)ID 连接此结果(如果它通过且没有错误)。LEFT JOIN
太多了。这意味着无论右侧的任何行是否匹配,都附加到左侧的结果(然后连接空列)。它很慢,提供大量数据集,并且大多数列的结果为空,似乎毫无用处。GROUP BY
子句连接子查询以获取连接标签关于php - 如何在mysql中加入像pivot这样的未知条件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37614620/
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