您好,登錄后才能下訂單哦!
本篇內(nèi)容主要講解“mysql數(shù)據(jù)庫(kù)主鍵id是怎樣生成的”,感興趣的朋友不妨來(lái)看看。本文介紹的方法操作簡(jiǎn)單快捷,實(shí)用性強(qiáng)。下面就讓小編來(lái)帶大家學(xué)習(xí)“mysql數(shù)據(jù)庫(kù)主鍵id是怎樣生成的”吧!
1、利用uuid函數(shù)生成唯一且不規(guī)則的主鍵id
2、id實(shí)現(xiàn)自動(dòng)增長(zhǎng)
sql:
CREATE TABLE `test` ( `id` varchar(100) COLLATE utf8_estonian_ci NOT NULL COMMENT '唯一不重復(fù)', `create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, `update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, `sex` int(11) DEFAULT NULL, `name` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL, `username` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL, `password` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL, `classes` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL, `major` int(255) DEFAULT NULL, `QQ` int(20) DEFAULT NULL, `introducemyself` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_estonian_ci ROW_FORMAT=DYNAMIC;
表:
插入語(yǔ)句:
INSERT INTO test(id,sex,name,username,password,classes,major,QQ,introducemyself) VALUE(replace(uuid(), '-', ''),1,"小米","xck","001","八班",265,953190259,"我最牛");
執(zhí)行了倆次,生成了倆個(gè)不同id:
將類(lèi)型改為整型,下方選擇自動(dòng)增長(zhǎng)
看DDL:
CREATE TABLE `test` ( `id` bigint(100) NOT NULL AUTO_INCREMENT COMMENT '唯一不重復(fù)', `create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, `update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, `sex` int(11) DEFAULT NULL, `name` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL, `username` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL, `password` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL, `classes` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL, `major` int(255) DEFAULT NULL, `QQ` int(20) DEFAULT NULL, `introducemyself` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_estonian_ci ROW_FORMAT=DYNAMIC;
插入一條數(shù)據(jù),sql:
INSERT INTO test(sex,name,username,password,classes,major,QQ,introducemyself) VALUE(1,"小米","xck","001","八班",265,953190259,"我最牛");
對(duì)應(yīng)數(shù)據(jù)庫(kù)變化:
到此,相信大家對(duì)“mysql數(shù)據(jù)庫(kù)主鍵id是怎樣生成的”有了更深的了解,不妨來(lái)實(shí)際操作一番吧!這里是億速云網(wǎng)站,更多相關(guān)內(nèi)容可以進(jìn)入相關(guān)頻道進(jìn)行查詢,關(guān)注我們,繼續(xù)學(xué)習(xí)!
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點(diǎn)不代表本網(wǎng)站立場(chǎng),如果涉及侵權(quán)請(qǐng)聯(lián)系站長(zhǎng)郵箱:is@yisu.com進(jìn)行舉報(bào),并提供相關(guān)證據(jù),一經(jīng)查實(shí),將立刻刪除涉嫌侵權(quán)內(nèi)容。