mysqld 升級到8以上遇到的問題

coav4u · 發表於 2021-3-14 13:06:23

(1)
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)

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
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]

character-set-server=utf8
default_authentication_plugin=mysql_native_password
validate_password.policy=LOW
[mysql]
default-character-set=utf8

[client]
default-character-set=utf8

然後重啟mysqld
service mysqld restart

重啟後可能須做下列動作:
mysql -u roor -p
SHOW 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!!

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 ~~~

<?3 l, ~; s3 J2 E2 a# L+ f% Q% q
$hostname = "x.x.x.x";
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$database = "db_name";
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$username = "user_name";
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$password = "pwd";5 i$ N( J) Q. ?& ^
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$conn = mysqli_connect($hostname, $username, $password,$database) or trigger_error(mysql_error(),E_USER_ERROR);
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mysqli_query($conn ,"SET NAMES utf8");: [7 x# G* R4 z- h Y3 @. i
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$sql = "select count(*) as total from " . "table_name";
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$rec = mysqli_fetch_assoc(mysqli_query( $conn,$sql));
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echo $rec['total'];" B" g, p5 x4 P2 G" F' f
mysqli_close($conn);
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?>

複製代碼

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當php 7.2.24 connect to mysql server,出現 :

PHP Fatal error: Uncaught Error: Call to undefined function mysqli_connect() in /test/connectmysql8.php:9
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Stack trace:
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#0 {main}
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thrown in /test/connectmysql8.php on line 9; b1 @$ F7 S$ @" @: i r; m5 c* g
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Fatal error: Uncaught Error: Call to undefined function mysqli_connect() in /test/connectmysql8.php:9( y' k, g# ]2 Y. d0 _
Stack trace:7 A, H5 o- U! M
#0 {main}
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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.
說明: 千萬不能照它建議用"UTF8MB4",否則無法成功啟動

(2)
(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
SELECT 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
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

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，
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，
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。

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。

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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[mysql] mysqld 升級到8以上遇到的問題

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