mysqld 升級到8以上遇到的問題

coav4u

(1)
! e; w8 S4 G/ t* l0 w. b: {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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* H* d" s6 J$ \" U$ |" |* tmysqli_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
: Y$ w% Z% d& ^原因:
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:
[mysqld]

! c% b: B& x# n3 }0 s! pcharacter-set-server=utf8
6 p# U8 W3 m; u% Fdefault_authentication_plugin=mysql_native_password
validate_password.policy=LOW
% m* V* b$ X, k6 ?[mysql]
  x* c: f* J' ^6 mdefault-character-set=utf8
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* `' ^) Z' v3 j1 [[client]
5 @* H: ~  e6 idefault-character-set=utf8

  f, A  P. L. ?1 z; @然後重啟mysqld
service mysqld restart

重啟後可能須做下列動作:
) \, N4 }- I: K- [$ D# D* mmysql -u roor -p  
' @2 {6 H5 @) k5 J' f+ nSHOW VARIABLES LIKE 'validate_password%';
SET GLOBAL validate_password_policy=LOW;ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '你的密碼';搞定!!

4 |$ N* y4 k2 i; m: A* F6 v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";
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5. $password = "pwd";
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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. 
   
10. $sql = "select count(*) as total from " .  "table_name";
    # X! k6 o$ E+ l" m$ ?$ x7 U! ^
11. $rec = mysqli_fetch_assoc(mysqli_query( $conn,$sql));
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12. echo $rec['total'];
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13. mysqli_close($conn);
    
14. ?>

複製代碼

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


[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.
, e% e, K' n/ j8 l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
( u7 s( \* e# O8 ISELECT COUNT(*) FROM common_usergroup WHERE type='special' and system>0

(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
$ ]7 U/ ?  s- G  R1 xSELECT * 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

& C' g) X- N& ^; f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`。
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第一個錯誤需要找到Discuz!目錄中的source\class\table\table_common_usergroup.php，
. F8 g* [2 B8 B7 F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。
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- _& j; Q# B: R第二個錯誤需要找到Discuz!目錄下中的source\class\table\table_forum_announcement.php，
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。

2 L% O% P5 p4 W! J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。

. n1 @- b! t3 N9 d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。
" z8 K( g/ o- F( _' J1 M- O9 ^$ Z6 s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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