一次 JDBC 与 MySQL 因 “CST” 时区协商误解导致时间差了 14 或 13 小时的排错经历...
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CST 時區
名為 CST 的時區是一個很混亂的時區,有四種含義:
- 美國中部時間 Central Standard Time (USA) UTC-06:00
- 澳大利亞中部時間 Central Standard Time (Australia) UTC+09:30
- 中國標準時 China Standard Time UTC+08:00
- 古巴標準時 Cuba Standard Time UTC-04:00
今天是“4月28日”。為什么提到日期?因為美國從“3月11日”至“11月7日”實行夏令時,美國中部時間改為 UTC-05:00,與 UTC+08:00 相差 13 小時。
排錯過程
在項目中,偶然發現數據庫中存儲的 Timestamp 字段的 unix_timestamp() 值比真實值少了 13 個小時。通過調試追蹤,發現了?com.mysql.cj.jdbc?里的時區協商有問題。
當 JDBC 與 MySQL 開始建立連接時,會調用?com.mysql.cj.jdbc.ConnectionImpl.initializePropsFromServer()?獲取服務器參數,其中我們看到調用?this.session.configureTimezone()?函數,它負責配置時區。
public void configureTimezone() {String configuredTimeZoneOnServer = getServerVariable("time_zone");if ("SYSTEM".equalsIgnoreCase(configuredTimeZoneOnServer)) {configuredTimeZoneOnServer = getServerVariable("system_time_zone");}String canonicalTimezone = getPropertySet().getStringReadableProperty(PropertyDefinitions.PNAME_serverTimezone).getValue();if (configuredTimeZoneOnServer != null) {// user can override this with driver properties, so don't detect if that's the caseif (canonicalTimezone == null || StringUtils.isEmptyOrWhitespaceOnly(canonicalTimezone)) {try {canonicalTimezone = TimeUtil.getCanonicalTimezone(configuredTimeZoneOnServer, getExceptionInterceptor());} catch (IllegalArgumentException iae) {throw ExceptionFactory.createException(WrongArgumentException.class, iae.getMessage(), getExceptionInterceptor());}}}if (canonicalTimezone != null && canonicalTimezone.length() > 0) {this.serverTimezoneTZ = TimeZone.getTimeZone(canonicalTimezone);// The Calendar class has the behavior of mapping unknown timezones to 'GMT' instead of throwing an exception, so we must check for this...if (!canonicalTimezone.equalsIgnoreCase("GMT")&& this.serverTimezoneTZ.getID().equals("GMT")) {throw ...}}this.defaultTimeZone = this.serverTimezoneTZ; }追蹤代碼可知,當 MySQL 的?time_zone?值為?SYSTEM?時,會取?system_time_zone?值作為協調時區。
讓我們登錄到 MySQL 服務器驗證這兩個值:
mysql> show variables like '%time_zone%'; +------------------+--------+ | Variable_name | Value | +------------------+--------+ | system_time_zone | CST | | time_zone | SYSTEM | +------------------+--------+ 2 rows in set (0.00 sec)重點在這里!若?String configuredTimeZoneOnServer?得到的是?CST?那么 Java 會誤以為這是?CST -0500?,因此?TimeZone.getTimeZone(canonicalTimezone)?會給出錯誤的時區信息。
?debug variables
如圖所示,本機默認時區是?Asia/Shanghai +0800?,誤認為服務器時區為?CST -0500?,實際上服務器是?CST +0800?。
我們會想到,即便時區有誤解,如果 Timestamp 是以 long 表示的時間戳傳輸,也不會出現問題,下面讓我們追蹤到?com.mysql.cj.jdbc.PreparedStatement.setTimestamp()?。
public void setTimestamp(int parameterIndex, Timestamp x) throws java.sql.SQLException {synchronized (checkClosed().getConnectionMutex()) {setTimestampInternal(parameterIndex, x, this.session.getDefaultTimeZone());} }注意到這里?this.session.getDefaultTimeZone()?得到的是剛才那個?CST -0500?。
private void setTimestampInternal(int parameterIndex, Timestamp x, TimeZone tz) throws SQLException {if (x == null) {setNull(parameterIndex, MysqlType.TIMESTAMP);} else {if (!this.sendFractionalSeconds.getValue()) {x = TimeUtil.truncateFractionalSeconds(x);}this.parameterTypes[parameterIndex - 1 + getParameterIndexOffset()] = MysqlType.TIMESTAMP;if (this.tsdf == null) {this.tsdf = new SimpleDateFormat("''yyyy-MM-dd HH:mm:ss", Locale.US);}this.tsdf.setTimeZone(tz);StringBuffer buf = new StringBuffer();buf.append(this.tsdf.format(x));if (this.session.serverSupportsFracSecs()) {buf.append('.');buf.append(TimeUtil.formatNanos(x.getNanos(), true));}buf.append('\'');setInternal(parameterIndex, buf.toString());} }原來 Timestamp 被轉換為會話時區的時間字符串了。問題到此已然明晰:
最終結果相差 13 個小時!如果處在冬令時還會相差 14 個小時!
解決方案
解決辦法也很簡單,明確指定 MySQL 數據庫的時區,不使用引發誤解的?CST?:
mysql> set global time_zone = '+08:00'; Query OK, 0 rows affected (0.00 sec)mysql> set time_zone = '+08:00'; Query OK, 0 rows affected (0.00 sec)或者修改?my.cnf?文件,在?[mysqld]?節下增加?default-time-zone = '+08:00'?。
修改時區操作影響深遠,需要重啟 MySQL 服務器,建議在維護時間進行。
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另一份解決方案:?
? ? ? ?最近遇到了一個問題,java從mysql從讀出的時間與本地時間有14個小時的時間差,經查證、測試解決了此問題,在此總結一下:
?
一、使用mysql-connector-java 6.x版本驅動需要做如下配置:
1、引入pom
| 1 2 3 4 5 | <dependency> ??<groupId>mysql</groupId> ??<artifactId>mysql-connector-java</artifactId> ??<version>6.0.6</version> </dependency> |
?
2、設置jdbc連接、驅動
| 1 2 3 | jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&serverTimezone=UTC&characterEncoding=utf-8&allowMultiQueries=true com.mysql.cj.jdbc.Driver |
?
?
二、設置mysql數據時區
1、查看mysql時區
| 1 | show?variables?like?"%time_zone%" |
?
2、修改mysql時區
(1)方法一
| 1 2 3 | set?global?time_zone?=?'+8:00';?##修改mysql全局時區為北京時間,即我們所在的東8區 set?time_zone?=?'+8:00';?##修改當前會話時區 flush?privileges;?#立即生效 |
(2)方法二、通過修改my.cnf配置文件來修改時區
| 1 2 3 | #?vim?/etc/my.cnf?##在[mysqld]區域中加上 default-time_zone?=?'+8:00' #?/etc/init.d/mysqld?restart?##重啟mysql使新時區生效 |
?
三、分析時區設置問題
? ? ? ?通過上面的設置,我們把mysql數據庫的時區設置成了中國的時區‘utc+8’,而serverTimezone=UTC設置的是utc時區,兩者不同,所以會發現從數據庫讀出的時間與本地時間差幾個小時。要解決這個問題,需要讓serverTimezone的設置與數據庫的時區保持一致。我們可以選擇修改serverTimezone的設置為serverTimezone=Asia/Shanghai,或者修改數據庫的時區為‘+0:00’。
?
四、serverTimezone支持的值說明
1、utc時區:serverTimezone=UTC
2、中國時區:serverTimezone=GMT%2B8(GMT+8這種方式支持全部時區,通過修改最后的數字實現,不過%2B不能寫成+)
3、查看官方源碼,可以看到serverTimezone支持的相關設置如下,如:中國的時區可設置為:serverTimezone=Asia/Shanghai
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America/St_Lucia=America/Port_of_Spain America/St_Thomas=America/Port_of_Spain America/St_Vincent=America/Port_of_Spain America/Tortola=America/Port_of_Spain America/Virgin=America/Port_of_Spain Antarctica/McMurdo=Pacific/Auckland Antarctica/South_Pole=Pacific/Auckland Arctic/Longyearbyen=Europe/Oslo Asia/Aden=Asia/Riyadh Asia/Ashkhabad=Asia/Ashgabat Asia/Bahrain=Asia/Qatar Asia/Calcutta=Asia/Kolkata Asia/Chongqing=Asia/Shanghai Asia/Chungking=Asia/Shanghai Asia/Dacca=Asia/Dhaka Asia/Harbin=Asia/Shanghai Asia/Istanbul=Europe/Istanbul Asia/Kashgar=Asia/Urumqi Asia/Katmandu=Asia/Kathmandu Asia/Kuwait=Asia/Riyadh Asia/Macao=Asia/Macau Asia/Muscat=Asia/Dubai Asia/Phnom_Penh=Asia/Bangkok Asia/Saigon=Asia/Ho_Chi_Minh Asia/Tel_Aviv=Asia/Jerusalem Asia/Thimbu=Asia/Thimphu Asia/Ujung_Pandang=Asia/Makassar Asia/Ulan_Bator=Asia/Ulaanbaatar Asia/Vientiane=Asia/Bangkok Atlantic/Faeroe=Atlantic/Faroe Atlantic/Jan_Mayen=Europe/Oslo Atlantic/St_Helena=Africa/Abidjan Australia/ACT=Australia/Sydney Australia/Canberra=Australia/Sydney Australia/LHI=Australia/Lord_Howe Australia/NSW=Australia/Sydney Australia/North=Australia/Darwin Australia/Queensland=Australia/Brisbane Australia/South=Australia/Adelaide Australia/Tasmania=Australia/Hobart Australia/Victoria=Australia/Melbourne Australia/West=Australia/Perth Australia/Yancowinna=Australia/Broken_Hill Brazil/Acre=America/Rio_Branco Brazil/DeNoronha=America/Noronha Brazil/East=America/Sao_Paulo Brazil/West=America/Manaus Canada/Atlantic=America/Halifax Canada/Central=America/Winnipeg Canada/East-Saskatchewan=America/Regina Canada/Eastern=America/Toronto Canada/Mountain=America/Edmonton Canada/Newfoundland=America/St_Johns Canada/Pacific=America/Vancouver Canada/Saskatchewan=America/Regina Canada/Yukon=America/Whitehorse Chile/Continental=America/Santiago Chile/EasterIsland=Pacific/Easter Cuba=America/Havana Egypt=Africa/Cairo Eire=Europe/Dublin Europe/Belfast=Europe/London Europe/Bratislava=Europe/Prague Europe/Busingen=Europe/Zurich Europe/Guernsey=Europe/London Europe/Isle_of_Man=Europe/London Europe/Jersey=Europe/London Europe/Ljubljana=Europe/Belgrade Europe/Mariehamn=Europe/Helsinki Europe/Nicosia=Asia/Nicosia Europe/Podgorica=Europe/Belgrade Europe/San_Marino=Europe/Rome Europe/Sarajevo=Europe/Belgrade Europe/Skopje=Europe/Belgrade Europe/Tiraspol=Europe/Chisinau Europe/Vaduz=Europe/Zurich Europe/Vatican=Europe/Rome Europe/Zagreb=Europe/Belgrade GB=Europe/London GB-Eire=Europe/London GMT+0=Etc/GMT GMT-0=Etc/GMT GMT0=Etc/GMT Greenwich=Etc/GMT Hongkong=Asia/Hong_Kong Iceland=Atlantic/Reykjavik Indian/Antananarivo=Africa/Nairobi Indian/Comoro=Africa/Nairobi Indian/Mayotte=Africa/Nairobi Iran=Asia/Tehran Israel=Asia/Jerusalem Jamaica=America/Jamaica Japan=Asia/Tokyo Kwajalein=Pacific/Kwajalein Libya=Africa/Tripoli Mexico/BajaNorte=America/Tijuana Mexico/BajaSur=America/Mazatlan Mexico/General=America/Mexico_City NZ=Pacific/Auckland NZ-CHAT=Pacific/Chatham Navajo=America/Denver PRC=Asia/Shanghai Pacific/Johnston=Pacific/Honolulu Pacific/Midway=Pacific/Pago_Pago Pacific/Ponape=Pacific/Pohnpei Pacific/Saipan=Pacific/Guam Pacific/Samoa=Pacific/Pago_Pago Pacific/Truk=Pacific/Chuuk Pacific/Yap=Pacific/Chuuk Poland=Europe/Warsaw Portugal=Europe/Lisbon ROC=Asia/Taipei ROK=Asia/Seoul Singapore=Asia/Singapore Turkey=Europe/Istanbul UCT=Etc/UCT US/Alaska=America/Anchorage US/Aleutian=America/Adak US/Arizona=America/Phoenix US/Central=America/Chicago US/East-Indiana=America/Indiana/Indianapolis US/Eastern=America/New_York US/Hawaii=Pacific/Honolulu US/Indiana-Starke=America/Indiana/Knox US/Michigan=America/Detroit US/Mountain=America/Denver US/Pacific=America/Los_Angeles US/Pacific-New=America/Los_Angeles US/Samoa=Pacific/Pago_Pago Universal=Etc/UTC W-SU=Europe/Moscow Zulu=Etc/UTC #Standard?(IANA)?abbreviations #Mon?Sep?28?16:41:59?WEST?2015 ACWST=Australia/Eucla AFT=Asia/Kabul ALMT=Asia/Almaty ANAT=Asia/Anadyr AZOST=Atlantic/Azores AZOT=Atlantic/Azores AZST=Asia/Baku AZT=Asia/Baku BDT=Asia/Dhaka BNT=Asia/Brunei BOT=America/La_Paz BRST=America/Sao_Paulo BTT=Asia/Thimphu CAT=Africa/Maputo CCT=Indian/Cocos CHADT=Pacific/Chatham CHAST=Pacific/Chatham CHOST=Asia/Choibalsan CHOT=Asia/Choibalsan CHUT=Pacific/Chuuk CKT=Pacific/Rarotonga COT=America/Bogota CVT=Atlantic/Cape_Verde CXT=Indian/Christmas ChST=Pacific/Guam DAVT=Antarctica/Davis DDUT=Antarctica/DumontDUrville EAST=Pacific/Easter ECT=America/Guayaquil EGST=America/Scoresbysund EGT=America/Scoresbysund FJST=Pacific/Fiji FJT=Pacific/Fiji FKST=Atlantic/Stanley FNT=America/Noronha GALT=Pacific/Galapagos GAMT=Pacific/Gambier GET=Asia/Tbilisi GFT=America/Cayenne GILT=Pacific/Tarawa GYT=America/Guyana HDT=America/Adak HKT=Asia/Hong_Kong HOVST=Asia/Hovd HOVT=Asia/Hovd IDT=Asia/Jerusalem IOT=Indian/Chagos IRST=Asia/Tehran JST=Asia/Tokyo KGT=Asia/Bishkek KOST=Pacific/Kosrae LHDT=Australia/Lord_Howe LHST=Australia/Lord_Howe LINT=Pacific/Kiritimati MAGT=Asia/Magadan MART=Pacific/Marquesas MAWT=Antarctica/Mawson MEST=MET MET=MET MIST=Antarctica/Macquarie MMT=Asia/Rangoon MUT=Indian/Mauritius MVT=Indian/Maldives NCT=Pacific/Noumea NDT=America/St_Johns NFT=Pacific/Norfolk NOVT=Asia/Novosibirsk NPT=Asia/Kathmandu NRT=Pacific/Nauru NST=America/St_Johns NUT=Pacific/Niue NZDT=Pacific/Auckland NZST=Pacific/Auckland OMST=Asia/Omsk ORAT=Asia/Oral PET=America/Lima PETT=Asia/Kamchatka PGT=Pacific/Port_Moresby PHOT=Pacific/Enderbury PHT=Asia/Manila PKT=Asia/Karachi PMDT=America/Miquelon PMST=America/Miquelon PONT=Pacific/Pohnpei PWT=Pacific/Palau PYST=America/Asuncion PYT=America/Asuncion QYZT=Asia/Qyzylorda RET=Indian/Reunion ROTT=Antarctica/Rothera SAKT=Asia/Sakhalin SAMT=Europe/Samara SAST=Africa/Johannesburg SBT=Pacific/Guadalcanal SCT=Indian/Mahe SGT=Asia/Singapore SRET=Asia/Srednekolymsk SRT=America/Paramaribo SST=Pacific/Pago_Pago SYOT=Antarctica/Syowa TAHT=Pacific/Tahiti TFT=Indian/Kerguelen TJT=Asia/Dushanbe TKT=Pacific/Fakaofo TLT=Asia/Dili TMT=Asia/Ashgabat TOT=Pacific/Tongatapu TVT=Pacific/Funafuti ULAST=Asia/Ulaanbaatar ULAT=Asia/Ulaanbaatar UYT=America/Montevideo VET=America/Caracas VOST=Antarctica/Vostok VUT=Pacific/Efate WAKT=Pacific/Wake WAST=Africa/Windhoek WFT=Pacific/Wallis WGST=America/Godthab WGT=America/Godthab WIT=Asia/Jayapura WITA=Asia/Makassar WSDT=Pacific/Apia WSST=Pacific/Apia XJT=Asia/Urumqi YEKT=Asia/Yekaterinburg |
以上內容在src\main\resources\com\mysql\cj\jdbc\util.TimeZoneMapping.properties,
= 后面的值為我們可以用來設置的值
本文出自 “星技傳閱” 博客,請務必保留此出處http://snowtiger.blog.51cto.com/12931578/1967441
轉載于:https://my.oschina.net/CasparLi/blog/1541902
總結
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