mysqld 升級到8以上遇到的問題

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php連到mysql出現2行errors : (discuz網頁出現的是連接到mysql錯誤表格,需自行寫一隻連接mysql的php程式來測試)
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0 x9 g' N2 U' [mysqli_real_connect(): Server sent charset (255) unknown to the client. Please, report to the developers
mysqli_real_connect(): (HY000/2054): Server sent charset unknown to the client. Please, report to the developers
6 Z7 T/ [  @1 j+ F: z' u  |原因:
. m, [1 T% Z: j% i4 W) b在MySQL 8.0.21中，caching_sha2_password是默認的身份驗證插件，而不是以往的mysql_native_password。所以和php不相容。可以降級php，也可以修改MySQL的配置。 吾人決定修改MySQL的配置:
vi /etc/my.cnf  加入下列:
  m- _" {( w8 s; |3 m) _, V( v[mysqld]
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default_authentication_plugin=mysql_native_password
validate_password.policy=LOW
[mysql]
default-character-set=utf8
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[client]
* e$ [% y6 d: N5 o" a! m+ Hdefault-character-set=utf8
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8 W+ L* u$ K. ^/ }& E/ q) n" }* E然後重啟mysqld
: p; \2 j6 J" i( s+ }service mysqld restart
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重啟後可能須做下列動作:
mysql -u roor -p  
7 ~2 l: O- l; X& B3 rSHOW VARIABLES LIKE 'validate_password%';
* s+ h, U- A# Z  B3 aSET GLOBAL validate_password_policy=LOW;ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '你的密碼';搞定!!
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$ N% R( m+ h0 {註: mysqld啟動時,在/var/log/mysql/mysqld.log紀錄著:註: 可以先寫支php程式以測試 ~~~
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1. <?
   
2. $hostname = "x.x.x.x";
   
3. $database = "db_name";
   
4. $username = "user_name";
   
5. $password = "pwd";
   
6. 
   
7. $conn = mysqli_connect($hostname, $username, $password,$database) or trigger_error(mysql_error(),E_USER_ERROR);
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8. mysqli_query($conn ,"SET NAMES utf8");
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9. 
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10. $sql = "select count(*) as total from " .  "table_name";
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11. $rec = mysqli_fetch_assoc(mysqli_query( $conn,$sql));
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12. echo $rec['total'];
    
13. mysqli_close($conn);
    
14. ?>

複製代碼

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8 K# C7 Q7 h' \2 @當php 7.2.24  connect to mysql server,出現 :

1. PHP Fatal error:  Uncaught Error: Call to undefined function mysqli_connect() in /test/connectmysql8.php:9
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2. Stack trace:
   
3. #0 {main}
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4.   thrown in /test/connectmysql8.php on line 9
   
5. 
   
6. Fatal error: Uncaught Error: Call to undefined function mysqli_connect() in /test/connectmysql8.php:9
   
7. Stack trace:
   
8. #0 {main}
   
9.   thrown in /test/connectmysql8.php on line 9

複製代碼

這是版本相依的問題,只要 yum install php-mysqlnd  或 yum install php-mysqli 即可

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[Warning] [MY-013242] [Server] --character-set-server: 'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
: M  X/ @# U( l+ Q3 r! g2 r說明: 千萬不能照它建議用"UTF8MB4",否則無法成功啟動
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(1064) 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 'system>0' at line 1
+ |9 |& _4 C$ [" T) D; u  b8 X8 c' y4 fSELECT COUNT(*) FROM common_usergroup WHERE type='special' and system>0
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$ o# D& a% f- ?4 C( P(1064) 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 'groups = '' AND starttime<=1532077291 AND (endtime>=1532077291 OR endtime=0) ORD' at line 1
  }8 ~0 E. F: {8 ~; f* \SELECT * FROM forum_announcement WHERE type!=2 AND groups = '' AND starttime<=1532077291 AND (endtime>=1532077291 OR endtime=0) ORDER BY displayorder, starttime DESC, id DESC LIMIT 1

9 |. V9 K7 R3 ~  Z因為MySQL 8.0+將system和groups作為了關鍵字，所以不能直接在SQL中將system和groups這兩個詞作為數據庫、數據表、數據表字段中的任意一種使用，如果數據庫名或數據表名或數據表字段名使用了system或groups作為名字，必須使用一對反引號引用起來。寫作`system`或`groups`。

第一個錯誤需要找到Discuz!目錄中的source\class\table\table_common_usergroup.php，
1 U0 k" E2 |4 Q( B/ D* Q1 W將文件中所有的system全部改成`system`，保存後重新上傳到服務器的相同目錄即可。

第二個錯誤需要找到Discuz!目錄下中的source\class\table\table_forum_announcement.php，
/ L( u0 C9 ~9 n' M% k) J將文件中所有的groups全部改為`groups`，保存後重新上傳到服務器的相同目錄即可。

, y$ f! \2 a$ v3 b0 A7 h如果在MySQL 8+環境下安裝Discuz!，在安裝前需要給install\data\install.sql文件中沒有加引號的所有system逐一添加一對反引號保存重新上傳到服務器的相同目錄，否則也會出現SQL語法錯誤。
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$ i6 m1 ]# B9 v6 T7 `2 |$ q" `! {為了避免語法錯誤，在寫SQL語句時，一定要為所有的數據庫名、數據表名、數據表字段名全部添加一對反引號，像Discuz!這樣的寫法是很不妥的。
以上參考:   升級到 MySQL 8.0+ 後Discuz! 更新緩存時出現SQL語法錯誤
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