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標題: mysqld 升級到8以上遇到的問題 [打印本頁]
作者: coav4u    時間: 2021-3-14 13:06
標題: 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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7 ?! I& s/ E: k, dmysqli_real_connect(): Server sent charset (255) unknown to the client. Please, report to the developers' p& d0 C2 S# V) L7 x
mysqli_real_connect(): (HY000/2054): Server sent charset unknown to the client. Please, report to the developers. }5 ~+ E% j$ U+ Z. {
原因:
2 N+ {( D$ t! p5 Z4 T/ |8 X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:
2 Q$ N! q1 `( F: q# Jvi /etc/my.cnf  加入下列:
# ?. c% j9 g; R3 W[mysqld]# Y6 z/ K  N% g0 R
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character-set-server=utf8
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validate_password.policy=LOW
8 Q, J) k( x! v0 E  W4 P; X8 D[mysql]
9 C) `, d5 [$ v  ~default-character-set=utf8* f( \2 Q1 l8 U$ F4 |! J
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[client]+ J8 p( {( P& u5 V& T3 s4 V
default-character-set=utf8
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然後重啟mysqld
  f2 [$ i$ h. z0 `8 mservice mysqld restart5 @+ S8 J+ n& K
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重啟後可能須做下列動作:
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SHOW VARIABLES LIKE 'validate_password%';
8 N' w# q$ j% }* F4 T8 L" U& ySET GLOBAL validate_password_policy=LOW;ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '你的密碼';搞定!!1 s7 S6 d4 Y, v; i/ P

! q, ~* p9 U# _2 I7 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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  2. $hostname = "x.x.x.x";; O$ f: s8 j  R  a/ B* r7 j' U
  3. $database = "db_name";
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  4. $username = "user_name";5 R# F5 C& s+ H0 ~
  5. $password = "pwd";
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  7. $conn = mysqli_connect($hostname, $username, $password,$database) or trigger_error(mysql_error(),E_USER_ERROR);( J% q7 ~5 N$ t! l2 w6 |, y& n
  8. mysqli_query($conn ,"SET NAMES utf8");
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  10. $sql = "select count(*) as total from " .  "table_name";) X0 m( e/ Y! r+ d! g
  11. $rec = mysqli_fetch_assoc(mysqli_query( $conn,$sql));! V# \" `/ S- M0 e+ M' n7 E
  12. echo $rec['total'];
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  13. mysqli_close($conn);/ O7 M8 W7 J* b5 P, ]. w1 ~( o8 U
  14. ?>
複製代碼
[hide=d100000000000000000000,999999999999]於video1主機下 /test/connectmysql8.php[/hide]. l6 r  P* E2 R- [# q+ q' q
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/ w1 o' E& ^$ H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:+ m1 e7 G5 j9 L; Q% K7 A
  3. #0 {main}
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  4.   thrown in /test/connectmysql8.php on line 9
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  5. 6 t* F. p( N! I- q& M( o7 s# x
  6. Fatal error: Uncaught Error: Call to undefined function mysqli_connect() in /test/connectmysql8.php:9
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  7. Stack trace:) b) C7 j+ j1 u7 ~, [& N
  8. #0 {main}! @* g' B: M- D( R/ C
  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& i/ J2 K: h2 M& f4 ^
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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.$ j- U0 z9 K; O+ e; P5 x" c- ^1 O; `! d
說明: 千萬不能照它建議用"UTF8MB4",否則無法成功啟動
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(2)
8 s: {8 h! p0 J(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
6 X" B7 G0 Z- N: H. dSELECT COUNT(*) FROM common_usergroup WHERE type='special' and system>0+ H8 M9 m5 P" F9 C; V! N6 B. P( [: h
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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 'groups = '' AND starttime<=1532077291 AND (endtime>=1532077291 OR endtime=0) ORD' at line 1& D6 y3 s+ `4 {- o. m
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
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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`。2 h# m$ }( X! }& g8 a: s
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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，% ]+ a( K4 R8 k1 @
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。( K& o. J, s+ v: A% B

0 c( g6 W& ^9 y  g$ B第二個錯誤需要找到Discuz!目錄下中的source\class\table\table_forum_announcement.php，* Z0 k4 ]$ j5 |0 }, G% b
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。) F9 E0 |$ X6 C! k
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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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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。" j" f  |0 n, d, L# W- @
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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