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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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( a, O6 G( {$ X& v  ^8 Pphp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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; \1 G  e+ G& K1 Pmysqli_real_connect(): Server sent charset (255) unknown to the client. Please, report to the developers8 z) {( `" F: S! U
mysqli_real_connect(): (HY000/2054): Server sent charset unknown to the client. Please, report to the developers  \( R  ^/ r& ^) _
原因:/ S& A: o- Z- }- w% @1 o
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:: y6 ?' n# }: c/ w
vi /etc/my.cnf  加入下列:
. ~# e# a' {+ b) X, ?: S[mysqld]6 y8 A% m: A, }

! T% }9 f  g1 t4 X1 Icharacter-set-server=utf8
2 p& {! r  s( B5 }2 h6 u* ndefault_authentication_plugin=mysql_native_password. X- ]% J/ i' Z( C9 ]
validate_password.policy=LOW( J" i) Q( |6 Q3 x& a
[mysql]! g3 h) N+ k! S# R6 G" m1 D
default-character-set=utf8" v9 B6 F1 ?1 U: g3 U% D0 Q  v
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[client]
* l$ f; n; b, c; L1 tdefault-character-set=utf8
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0 N- T7 i) m- G  v然後重啟mysqld
9 J$ ^# a% K6 P# w  n1 l+ Hservice mysqld restart
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重啟後可能須做下列動作:
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SHOW VARIABLES LIKE 'validate_password%';7 h$ r. N# {! f. Q# ^
SET 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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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. <?
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  2. $hostname = "x.x.x.x";
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  3. $database = "db_name";7 ^5 ?! y( Z2 ?
  4. $username = "user_name";
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  5. $password = "pwd";( h0 m+ Z% m. ?2 Q$ C; F1 r- ?

  6. 7 v" [" v& v9 U' g. q
  7. $conn = mysqli_connect($hostname, $username, $password,$database) or trigger_error(mysql_error(),E_USER_ERROR);8 v- y+ U0 x9 u5 [2 `
  8. mysqli_query($conn ,"SET NAMES utf8");
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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));& \. G  ^3 h1 O) O
  12. echo $rec['total'];# t: `6 f9 R# s7 v6 T
  13. mysqli_close($conn);
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  14. ?>
複製代碼
[hide=d100000000000000000000,999999999999]於video1主機下 /test/connectmysql8.php[/hide]
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$ A% ]) R0 w4 M5 Q, ?/ y- n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# J! z6 i$ T. |6 L# a9 s
  2. Stack trace:
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  3. #0 {main}
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  4.   thrown in /test/connectmysql8.php on line 9& q& Z& S% u3 G( S5 X) |

  5. 3 U' z$ S- K& a! N3 q* O+ a1 ^
  6. Fatal error: Uncaught Error: Call to undefined function mysqli_connect() in /test/connectmysql8.php:9- O% E+ Q# h6 V5 o2 G
  7. Stack trace:+ l  f$ i3 T( x0 n& [
  8. #0 {main}6 k0 x$ j0 [5 r7 W) {+ D
  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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. f4 ]" N' c5 M6 p[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.
; E5 S; T0 L9 K( v說明: 千萬不能照它建議用"UTF8MB4",否則無法成功啟動2 y1 N' \2 \* [* r- j# f

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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 15 r1 L! P0 D* h4 s
SELECT COUNT(*) FROM common_usergroup WHERE type='special' and system>00 ^3 G; Q& E( w, {3 j
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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. X( Z  z0 m. J; M  P. t
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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) w$ D/ V) ]" d% J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`。( G: }6 ^  l6 z. ^! d6 q  M
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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，
6 T  U& A2 {/ B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。; Z/ b9 V" F# z3 l% F" [
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第二個錯誤需要找到Discuz!目錄下中的source\class\table\table_forum_announcement.php，1 Y. K7 X( R! t" e
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。' b* L0 ?2 A% a
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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。
. i  Z( D! ~( ^. q" B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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