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【译】Mysql 中的 "utf8" 编码是个假的 utf-8,请使用 True utf-8 编码:"utf8mb4"

2019-5-13 / 1 评论 / 1550 浏览 / Mrxn

zhu:yixiawenzhangweiyiwen,yeshiwozuijinyudaodemysqlwenti,guzhaichaozaicizuobeiyong,ruyouqinquan,qinglianxiwo,wohuilijichuli。 zuijinwoyudaoleyige bug,woshizhetongguo rails zaiyi“utf8”bianmade mariadb zhongbaocunyige utf-8 zifuchuan,ranhouchuxianleyigeliqidecuowu: incorrect string value: ‘\xf0\x 9f \x 98 \x 83 ...

关于SQL中join的各种用法总结

2019-4-17 / 0 评论 / 1556 浏览 / Mrxn

shouxianshengming:wenzhanglaiyuanyuguowaide codeproject wozheilizhishiyouyufuxisqldeshihouxuyaojiugooglesousuo[keyiyongwogerendajiandegooglesousuogongdajiasousuowenzhangxuexishiyong]leyixia,zhaodaozheipianwenzhang,zaicizuogejiandandejilutongshiyefangbianyihoudeyouyuanren,ruyouqinquandedifanghaiqinglaixinzhuming,ganxieyuanwendezuozhedeqinlaofuchu,liuxiarucixiangxiquanmiandeguanyusqldejoindeyongfa。codeprojectshiguowaiyige...

MySQL 在 SELECT 的同时 UPDATE 同一张表

2019-4-15 / 1 评论 / 1321 浏览 / Mrxn

mysql buyunxu select from houmianzhixiangyongzuo update debiao,youshihourangrenjiujie。dangran,youbichuangjianwuxiuzhidelinshibiaogenghaodebanfa。benwenjieshiruhe update yizhangbiao,tongshizaichaxunzijuzhongshiyong select. wentimiaoshu jiashewoyao update debiaogenchaxunzijushitongyizhangbiao,zheiyangzuoyouxuduozhongyuanyin,liruyongtongjishujugengxinbiaodeziduan(cishixuyaoyong group zijufan...

MySQL 如何查找并删除重复行?

2019-4-15 / 0 评论 / 1193 浏览 / Mrxn

ruhechazhaozhongfuxing         diyibushidingyishenmeyangdexingcaishizhongfuxing。duoshuqingkuangxiahenjiandan:tamenmouyiliejuyouxiangtongdezhi。benwencaiyongzheiyidingyi,huoxunidui“zhongfu”dedingyibizheifuza,nixuyaoduisqlzuoxiexiugai。 benwenyaoyongdaodeshujuyangben create table test(id ...

emlog,连接数据库失败,请检查数据库信息,错误编号 2002

2017-12-24 / 4 评论 / 6019 浏览 / Mrxn

jintianqilaifaxianbokedabukaile,tishi:lianjieshujukushibai,qingjianchashujukuxinxi,cuowubianhao 2002。 shouxiankanzheigecuowudaimashi2002,bingbushiemlogdepeizhiwenjianyouwenti,yinweiconginclude/lib/mysql.phplimiankeyikandaozheige2002yinggaishimysqlbenshenchuwentile,danshibuyiding,xiamianlaipaichashibushimysqlbenshenchuwentile。 /** * neibushiliduixiang * @var obj...

MySQL order by 排序小计

2017-3-28 / 2 评论 / 1195 浏览 / Mrxn

zaishiyong mysql paixudeshihou, woxiangba kaohao(ziduan kh) limiancongzuoshudisange(baohandisange)qulianggeshuwei 11 desuoyoujieguode fenshu(ziduan fs)jinxing jiangxupailie,keshiwoyongorder bychuxianzheiyangdejieguo: qianmiandeyoubijiaoxiaodezhi(yuexiaobuyinggaizaizuihoume),houmiancaishianzhaojiangxupailiede(shujuyoujiqiantiao)...henganga, tongyang,woru...

【转载】基于约束的SQL攻击

2017-1-6 / 6 评论 / 2218 浏览 / Mrxn

qianyan zhideqingxingdeshirujinkaifazhezaigoujianwangzhanshi,yijingkaishizhuzhonganquanwentile。juedabufenkaifazhedouyishidaosqlzhuruloudongdecunzai,zaibenwenwoxiangyuduzhegongtongqutantaolingyizhongyusqlshujukuxiangguandeloudong,qiweihaiyusqlzhurubuxiangshangxia,danquebutaichangjian。jiexialai,wojiangweiduzhexiangxizhanshizheizhonggongjishoufa,yijixiangyingdefangyucelve。 zhuyi:benwenbushijiangshusqlzhurugongji beijingjieshao zuijin,wo...

再次验证百度这SB搜索,还是Google搜索靠谱

2015-10-13 / 6 评论 / 7596 浏览 / Mrxn

qiyinshizailuntankandaodeyigetiezizhaozhizhedebokedeyipianwenzhang:ruhejiangjiangduoshuopinglunshujuzhuanhuiemlog,danshibaidusousuodaodedoushiwufafangwende,yinweizhizhedewangzhanfuwuqichuwentileyang youkenengshizijizhetengsile。。。baiduhegooglezaisousuozheifangmianchadetaiyuanle。。。xiamianshiduibi doushizhujidangjile,keshigoogledehuancunhaishikeyiyongde,keshibaidudejiuwanwanle。。。baiduquxiaokuaizhaozhihou,...

让MySQL缺失的ID值自动恢复增长和补全缺失的ID

2015-7-23 / 0 评论 / 9447 浏览 / Mrxn

huashuo,baiduzhidaohenqiangda,zijihenruoxiaoya......caishuxueqian.ruxiatusuoshi:xiangyao cate_id ziduandezhi cong1kaishiwangxiazengzhang 1 2 3 4 5 6 7 8 ....,erbushi2 3 4 5 6 7 8 .... yigongyou3zhongxiufufangfa: diyizhongshouxiandongxiufucheng1 2 3 4 5 6 7 caozuomysql:shurualter table tdb_goo...

MySQL学习之多表更新一步到位

2015-7-12 / 0 评论 / 6609 浏览 / Mrxn

shouxianshuoming:gerenxuexibijieryi,buxiwukan,yimianbushi. mysql> create table if not exists tdb_goods_cates( -> cate_id smallint unsigned primary key auto_increment, -> cate_name varchar(40) no...

MySQL的增(insert)删(delete)改(update)查(select)学习小计

2015-7-10 / 0 评论 / 6034 浏览 / Mrxn

jilucaozuo://charushuju insert [into] tbl_name [(col_name,...)] {values | value} ({expr|default},...),(...),... insert [into] tbl_name set col_name={expr|default},... insert [into] tbl_name...

mysql ERROR 1690 (22003): BIGINT UNSIGNED value is out of range in 解决办法

2015-7-9 / 0 评论 / 7437 浏览 / Mrxn

error 1690 (22003): bigint unsigned value is out of range in rutusuoshi,wozaishiyongmysqldeshihouni,yudaolezheizhongwenti,tongguoduniangzhaodaoledaan,zaicixiaoji.yibianrihouchakan,dashouziraodao,wupen. yongdaolianggeshijianchuoxiangjianlaizuochaxuntiaojian,youyuqilianggeziduandoushiunsignedde,binglianggededaxiaoshibuyiyang。suoyizhijiexiangjiancha...