I want to create a view from both the wp_users and wp_usermeta tables so that I can query rows in the view from an external application. Basic auth details are stored in wp_users (e.g. username, password, email, id) and other fields are stored in key/value pairs in the wp_usermeta table.
我想从wp_users和wp_usermeta表中创建一个视图,以便从外部应用程序查询视图中的行。基本的身份信息存储在wp_users(例如用户名、密码、电子邮件、id)中,其他字段存储在wp_usermeta表的键/值对中。
the wp_users table is structured like this:
wp_users表的结构如下:
id | login | password | email
-----------------------------
1 | bsmith| abc123 | b@foo.com
2 | jjones| def456 | k@bah.com
the wp_usermeta table is structured like this:
wp_usermeta表的结构如下:
id | user_id | meta_key | meta_value
------------------------------------
1 | 1 | firstname| bob
2 | 1 | lastname | smith
3 | 1 | country | denmark
4 | 2 | firstname| jan
5 | 2 | lastname | jones
6 | 2 | country | germany
I want to end up with data like this as a MYSQL VIEW:
我想以这样的数据作为MYSQL视图结束:
id | login | password | email | firstname | lastname | country
-----------------------------------------------------------------
1 | bsmith| abc123 | b@foo.com| bob | smith | denmark
2 | jjones| def456 | k@bah.com| jan | jones | germany
I know I need to do at least an inner join between wp_users and wp_usermeta, however I also need to perform a sub query inside wp_usermeta to join those rows together.
我知道我至少需要在wp_users和wp_usermeta之间进行一个内部连接,但是我还需要在wp_usermeta中执行一个子查询来将这些行连接在一起。
The query I have for getting the user row is of course dead easy:
获取用户行所需的查询当然非常简单:
select u1.id, u1.login, u1.password, u1.email from wp_users u1
The query I have for getting the meta as a row this is:
我要将meta作为一行的查询是:
select m1.user_id, m1.meta_value as firstname, m2.meta_value as lastname, m3.meta_value as country
from wp_usermeta m1
join wp_usermeta m2 on (m1.user_id = m2.user_id and m2.meta_key = 'last_name')
join wp_usermeta m3 on (m2.user_id = m3.user_id and m3.meta_key = 'country')
where m1.meta_key = 'first_name'
So how do I join these two queries together - u1's data and the row where u1.id = m1.userid?
如何将这两个查询连接在一起u1的数据和u1所在的行。id = m1.userid吗?
3 个解决方案
#1
4
I found that Toote's solution works but is a performance hog on a MySQL database taking about 17 seconds to execute a "select * from users_with_meta_view".
我发现Toote的解决方案是有效的,但是在MySQL数据库上,执行“select * from users_with_meta_view”需要花费大约17秒。
I got this down to 0.0054 sec with a view structured like this instead:
我把这个降到0。0054秒,这样的结构是这样的:
CREATE OR REPLACE VIEW users_with_meta_view AS
SELECT
u.id,
u.user_login AS login,
u.user_pass AS password,
u.user_email AS email,
(select meta_value from wp_usermeta where user_id = u.id and meta_key = 'first_name' limit 1) as first_name,
(select meta_value from wp_usermeta where user_id = u.id and meta_key = 'last_name' limit 1) as last_name,
(select meta_value from wp_usermeta where user_id = u.id and meta_key = 'country' limit 1) as country
FROM wp_users u
#2
30
As far as I know, you are doing it the right way and just need to put them all together:
据我所知,你的做法是正确的,只需要把它们放在一起:
SELECT
u1.id,
u1.login,
u1.password,
u1.email,
m1.meta_value AS firstname,
m2.meta_value AS lastname,
m3.meta_value AS country
FROM wp_users u1
JOIN wp_usermeta m1 ON (m1.user_id = u1.id AND m1.meta_key = 'first_name')
JOIN wp_usermeta m2 ON (m2.user_id = u1.id AND m2.meta_key = 'last_name')
JOIN wp_usermeta m3 ON (m3.user_id = u1.id AND m3.meta_key = 'country')
WHERE
-- CONDITIONS ON the user you want to select based any field
#3
1
$sql= "SELECT
u1.parent_id,
m1.meta_value AS headline,
m2.meta_value AS profilephoto
FROM wp_vandor u1
JOIN wp_usermeta m1 ON (m1.user_id = u1.child_id AND m1.meta_key = 'headline')
JOIN wp_usermeta m2 ON (m2.user_id = u1.child_id AND m2.meta_key = 'profilephoto')
WHERE m1.user_id != $currentuser_id";
$classifieds = $wpdb->get_results($sql);
foreach ($classifieds as $classified) { ?>
<p><?php echo $classified->profilephoto; ?></p>
<h3><?php echo $classified->headline; ?></h3>
<?php } ?>
#1
4
I found that Toote's solution works but is a performance hog on a MySQL database taking about 17 seconds to execute a "select * from users_with_meta_view".
我发现Toote的解决方案是有效的,但是在MySQL数据库上,执行“select * from users_with_meta_view”需要花费大约17秒。
I got this down to 0.0054 sec with a view structured like this instead:
我把这个降到0。0054秒,这样的结构是这样的:
CREATE OR REPLACE VIEW users_with_meta_view AS
SELECT
u.id,
u.user_login AS login,
u.user_pass AS password,
u.user_email AS email,
(select meta_value from wp_usermeta where user_id = u.id and meta_key = 'first_name' limit 1) as first_name,
(select meta_value from wp_usermeta where user_id = u.id and meta_key = 'last_name' limit 1) as last_name,
(select meta_value from wp_usermeta where user_id = u.id and meta_key = 'country' limit 1) as country
FROM wp_users u
#2
30
As far as I know, you are doing it the right way and just need to put them all together:
据我所知,你的做法是正确的,只需要把它们放在一起:
SELECT
u1.id,
u1.login,
u1.password,
u1.email,
m1.meta_value AS firstname,
m2.meta_value AS lastname,
m3.meta_value AS country
FROM wp_users u1
JOIN wp_usermeta m1 ON (m1.user_id = u1.id AND m1.meta_key = 'first_name')
JOIN wp_usermeta m2 ON (m2.user_id = u1.id AND m2.meta_key = 'last_name')
JOIN wp_usermeta m3 ON (m3.user_id = u1.id AND m3.meta_key = 'country')
WHERE
-- CONDITIONS ON the user you want to select based any field
#3
1
$sql= "SELECT
u1.parent_id,
m1.meta_value AS headline,
m2.meta_value AS profilephoto
FROM wp_vandor u1
JOIN wp_usermeta m1 ON (m1.user_id = u1.child_id AND m1.meta_key = 'headline')
JOIN wp_usermeta m2 ON (m2.user_id = u1.child_id AND m2.meta_key = 'profilephoto')
WHERE m1.user_id != $currentuser_id";
$classifieds = $wpdb->get_results($sql);
foreach ($classifieds as $classified) { ?>
<p><?php echo $classified->profilephoto; ?></p>
<h3><?php echo $classified->headline; ?></h3>
<?php } ?>