So, a user was having some issues with their ranks being calculated totally wrong. \u00a0They were seeing numerous games against themselves. \u00a0Turns out this was the issue – MySql treats varchar() text with trailing spaces the same as varchar text without trailing spaces. \u00a0So the name “philhassey” is the same as “philhassey ” or “philhassey \u00a0 \u00a0 ” in a ‘select * from ip_stats3 where name = ?’ type of query. \u00a0Here’s a MySQL session below to demonstrate.<\/p>\n
mysql> describe ip_stats3;<\/p>\n
+———+————-+——+—–+———+——-+<\/p>\n
| Field \u00a0 | Type \u00a0 \u00a0 \u00a0 \u00a0| Null | Key | Default | Extra |<\/p>\n
+———+————-+——+—–+———+——-+<\/p>\n
| name \u00a0 \u00a0| varchar(32) | NO \u00a0 | PRI | NULL \u00a0 \u00a0| \u00a0 \u00a0 \u00a0 |\u00a0<\/p>\n
| data \u00a0 \u00a0| longblob \u00a0 \u00a0| YES \u00a0| \u00a0 \u00a0 | NULL \u00a0 \u00a0| \u00a0 \u00a0 \u00a0 |\u00a0<\/p>\n
| s_rank \u00a0| int(11) \u00a0 \u00a0 | YES \u00a0| \u00a0 \u00a0 | NULL \u00a0 \u00a0| \u00a0 \u00a0 \u00a0 |\u00a0<\/p>\n
| s_win \u00a0 | int(11) \u00a0 \u00a0 | YES \u00a0| \u00a0 \u00a0 | NULL \u00a0 \u00a0| \u00a0 \u00a0 \u00a0 |\u00a0<\/p>\n
| s_value | int(11) \u00a0 \u00a0 | YES \u00a0| \u00a0 \u00a0 | NULL \u00a0 \u00a0| \u00a0 \u00a0 \u00a0 |\u00a0<\/p>\n
| s_total | int(11) \u00a0 \u00a0 | YES \u00a0| \u00a0 \u00a0 | NULL \u00a0 \u00a0| \u00a0 \u00a0 \u00a0 |\u00a0<\/p>\n
+———+————-+——+—–+———+——-+<\/p>\n
6 rows in set (0.00 sec)<\/p>\n
\u00a0<\/p>\n
mysql> select name from ip_stats3 where name = ‘philhassey ‘;<\/p>\n
+————+<\/p>\n
| name \u00a0 \u00a0 \u00a0 |<\/p>\n
+————+<\/p>\n
| philhassey |\u00a0<\/p>\n
+————+<\/p>\n
1 row in set (0.00 sec)<\/p>\n
\u00a0<\/p>\n
mysql> select name from ip_stats3 where name = ‘philhassey’;<\/p>\n
+————+<\/p>\n
| name \u00a0 \u00a0 \u00a0 |<\/p>\n
+————+<\/p>\n
| philhassey |\u00a0<\/p>\n
+————+<\/p>\n
1 row in set (0.00 sec)<\/p>\n
\u00a0<\/p>\n
mysql> select name from ip_stats3 where name like ‘philhassey’;<\/p>\n
+————+<\/p>\n
| name \u00a0 \u00a0 \u00a0 |<\/p>\n
+————+<\/p>\n
| philhassey |\u00a0<\/p>\n
+————+<\/p>\n
1 row in set (0.00 sec)<\/p>\n
\u00a0<\/p>\n
mysql> select name from ip_stats3 where name like ‘philhassey ‘;<\/p>\n
Empty set (0.00 sec)<\/p>\n
\u00a0<\/p>\n
mysql> select name from ip_stats3 where name like ‘philhassey%’;<\/p>\n
+————+<\/p>\n
| name \u00a0 \u00a0 \u00a0 |<\/p>\n
+————+<\/p>\n
| philhassey |\u00a0<\/p>\n
+————+<\/p>\n
1 row in set (0.00 sec)<\/p>\n","protected":false},"excerpt":{"rendered":"
So, a user was having some issues with their ranks being calculated totally wrong. \u00a0They were seeing numerous games against themselves. \u00a0Turns out this was the issue – MySql treats varchar() text with trailing spaces the same as varchar text without trailing spaces. \u00a0So the name “philhassey” is the same as “philhassey ” or “philhassey […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-215","post","type-post","status-publish","format-standard","hentry","category-bugs"],"_links":{"self":[{"href":"https:\/\/www.philhassey.com\/blog\/wp-json\/wp\/v2\/posts\/215","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.philhassey.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.philhassey.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.philhassey.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.philhassey.com\/blog\/wp-json\/wp\/v2\/comments?post=215"}],"version-history":[{"count":0,"href":"https:\/\/www.philhassey.com\/blog\/wp-json\/wp\/v2\/posts\/215\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.philhassey.com\/blog\/wp-json\/wp\/v2\/media?parent=215"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.philhassey.com\/blog\/wp-json\/wp\/v2\/categories?post=215"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.philhassey.com\/blog\/wp-json\/wp\/v2\/tags?post=215"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}