{"id":1822,"date":"2021-03-17T14:09:10","date_gmt":"2021-03-17T06:09:10","guid":{"rendered":"\/?p=1822"},"modified":"2021-03-17T14:09:10","modified_gmt":"2021-03-17T06:09:10","slug":"36-insert-select%e8%af%ad%e5%8f%a5%e7%9a%84%e9%94%81","status":"publish","type":"post","link":"http:\/\/xinblog.ltd\/?p=1822","title":{"rendered":"36.insert…select\u8bed\u53e5\u7684\u9501"},"content":{"rendered":"

insert\u8bed\u53e5\u672c\u6765\u662f\u4e00\u4e2a\u8f7b\u91cf\u7ea7\u7684\u64cd\u4f5c,\u4f46\u662f\u8fd9\u4e2a\u8bed\u53e5\u53ea\u662f\u5bf9\u666e\u901a\u7684insert\u8bed\u53e5\u6709\u6548,\u4e5f\u5c31\u662f\u8bf4,\u6709\u4e9binsert\u8bed\u53e5\u5c5e\u4e8e “\u7279\u6b8a\u60c5\u51b5”<\/p>\n

\u8fd9\u6837\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\u9700\u8981\u5bf9\u5176\u4ed6\u8d44\u6e90\u52a0\u9501,\u6216\u8005\u65e0\u6cd5\u7533\u8bf7\u5230id\u540e\u7acb\u523b\u91ca\u653e\u9501<\/p>\n

1.<\/p>\n\n\n\n
CREATE TABLE `t` (<\/p>\n

`id` int(11) NOT NULL AUTO_INCREMENT,<\/p>\n

`c` int(11) DEFAULT NULL,<\/p>\n

`d` int(11) DEFAULT NULL,<\/p>\n

PRIMARY KEY (`id`),<\/p>\n

UNIQUE KEY `c` (`c`)<\/p>\n

) ENGINE=InnoDB;<\/p>\n

insert into t values(null, 1,1);<\/p>\n

insert into t values(null, 2,2);<\/p>\n

insert into t values(null, 3,3);<\/p>\n

insert into t values(null, 4,4);<\/p>\n

create table t2 like t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u521b\u5efa\u5b8c\u6210\u4e86\u8fd9\u4e2a\u8868,\u63a5\u4e0b\u6765\u770bbinlog_format=statement\u6267\u884c<\/p>\n

insert into t2(c,d) select c,d from t;<\/p>\n

\u8fd9\u4e2a\u8bed\u53e5\u662f\u5426\u662f\u9700\u8981\u8868t\u7684\u6240\u6709\u884c\u548c\u95f4\u9699\u52a0\u9501\u5462?<\/p>\n

\u63a5\u4e0b\u6765\u6267\u884c\u5982\u4e0b\u7684\u8bed\u53e5<\/p>\n

\"\u56fe\u7247\"<\/p>\n

\u5728\u771f\u5b9e\u60c5\u51b5\u4e0b,\u4e24\u4e2asession\u5e76\u4e0d\u80fd\u4e00\u8d77\u6267\u884c<\/p>\n

\u5b9e\u9645\u4e0a,\u5982\u679csessionB\u5148\u6267\u884c\u4e86,\u7531\u4e8e\u8fd9\u4e2a\u8bed\u53e5\u5bf9\u8868t\u4e3b\u952e\u7d22\u5f15\u52a0\u4e86(-\u221e,1],\u8fd9\u4e2anext-key-lock,\u4f1a\u5728\u8bed\u53e5\u6267\u884c\u5b8c\u6210\u540e,\u624d\u5141\u8bb8sessionA\u7684insert\u6267\u884c<\/p>\n

\u5982\u679c\u4e0d\u52a0\u9501\u7684\u8bdd,\u76f4\u63a5\u5f55\u5165binlog\u7684\u8bdd,\u53ef\u80fdsessionB\u7684\u8bed\u53e5\u5148\u6267\u884c,\u4f46\u662f\u5728sessionA\u7684\u8bed\u53e5\u540e\u5199\u5165binlog\u4e86<\/p>\n

\u53ef\u80fd\u51fa\u73b0binlog\u5982\u4e0b\u8bed\u53e5<\/p>\n

insert into t values(-1,-1,-1);<\/p>\n

insert into t2(c,d) select c,d from t;<\/p>\n

\u5bfc\u81f4\u51fa\u5907\u5e93\u6267\u884c\u7684\u65f6\u5019,\u51fa\u73b0\u4e86\u4e3b\u5907\u4e0d\u4e00\u81f4\u7684\u95ee\u9898<\/p>\n

insert….select\u7684\u8bed\u53e5<\/p>\n

\u5728\u6267\u884cinsert…select\u7684\u65f6\u5019,\u5982\u679c\u662f\u5982\u4e0b\u7684\u8bed\u53e5,\u6267\u884c\u4ece\u548c\u4e00\u4e2a\u8868\u4e0a\u590d\u5236\u5230\u53e6\u4e00\u4e2a\u8868\u4e0a<\/p>\n

\u6267\u884c\u5982\u4e0b\u7684\u8bed\u53e5<\/p>\n

insert into t2(c,d) (select c+1,d from t froce index(c) order by\u00a0 c desc limit 1)<\/p>\n

\u6574\u4e2a\u52a0\u9501\u8303\u56f4,\u5c31\u662f\u8868t \u7d22\u5f15\u4e0a(3,4]\u548c(4,supermum]\u4e24\u4e2anext key lock<\/p>\n

\u5176\u6267\u884c\u6d41\u7a0b\u5f88\u7b80\u5355,\u5c31\u662f\u4ece\u8868t\u6309\u7167\u7d22\u5f15\u5012\u5e8f,\u626b\u63cf\u7b2c\u4e00\u884c,\u62ff\u5230\u7ed3\u679c\u5199\u5165t2\u4e2d<\/p>\n

\u6574\u4e2a\u8bed\u53e5\u7684\u626b\u63cf\u884c\u6570\u662f1<\/p>\n

\u4f46\u662f\u5982\u679c\u6267\u884c\u5982\u4e0b\u7684\u8bed\u53e5<\/p>\n

insert into t(c,d) (select c+1,d from t force index(c) order by c desc limit 1);<\/p>\n

\u8fd9\u65f6\u5019\u4f1a\u5728explain\u4e2d\u53d1\u73b0,\u8fd9\u4e2a\u8bed\u53e5\u4f1a\u626b\u63cf5\u884c,<\/p>\n

\"\u56fe\u7247\"<\/p>\n

\u5728Extra\u5b57\u6bb5\u4e2d,\u53ef\u4ee5\u770b\u51faUsing temporary\u5b57\u6bb5,\u8bf4\u660e\u4f7f\u7528\u4e86\u4e34\u65f6\u8868<\/p>\n

\u800c\u4e14\u5e76\u4e0d\u662f\u53ea\u626b\u63cf\u4e861\u884c,\u800c\u662f\u5bf9\u8868t\u505a\u4e86\u4e00\u6b21\u5168\u8868\u626b\u63cf,\u6574\u4f53\u6d41\u7a0b\u5982\u4e0b:<\/p>\n

1.\u521b\u5efa\u4e34\u65f6\u8868,\u8868\u4e2d\u6709\u4e24\u4e2a\u5b57\u6bb5c,d<\/p>\n

2.\u6309\u7167\u7d22\u5f15c\u626b\u63cft,\u53d6\u51fa c=4,3,2,1 \u56de\u8868\u53d6\u56dec d\u7684\u503c\u653e\u5165\u4e34\u65f6\u8868<\/p>\n

3.\u4ece\u4e34\u65f6\u8868\u4e2d\u53d6\u51fa\u7b2c\u4e00\u884c,\u63d2\u5165\u8868t\u4e2d,\u8fd9\u4e00\u5171,5\u884c<\/p>\n

\u4e3a\u4ec0\u4e48\u4f1a\u51fa\u73b0\u8fd9\u4e2a\u60c5\u51b5,\u662f\u56e0\u4e3a\u8fd9\u4e2a\u8bed\u53e5\u6267\u884c\u8fc7\u7a0b\u4e2d,\u5982\u679c\u904d\u5386\u4e86\u6570\u636e,\u7136\u540e\u66f4\u65b0\u6570\u636e\u7684\u8bdd,\u8bfb\u51fa\u6765\u7684\u6570\u636e\u76f4\u63a5\u5199\u56de\u539f\u8868,\u53ef\u80fd\u5bfc\u81f4\u8bfb\u51fa\u6765\u7684\u503c\u662f\u65b0\u63d2\u5165\u7684\u503c,\u5bfc\u81f4\u8bed\u53e5\u6df7\u6dc6<\/p>\n

\u8fd9\u4e2a\u8bed\u53e5\u4f1a\u5bfc\u81f4\u5728\u8868 t \u4e0a\u505a\u5168\u8868\u626b\u63cf\uff0c\u5e76\u4e14\u4f1a\u7ed9\u7d22\u5f15 c \u4e0a\u7684\u6240\u6709\u95f4\u9699\u90fd\u52a0\u4e0a\u5171\u4eab\u7684 next-key lock\u3002\u6240\u4ee5\uff0c\u8fd9\u4e2a\u8bed\u53e5\u6267\u884c\u671f\u95f4\uff0c\u5176\u4ed6\u4e8b\u52a1\u4e0d\u80fd\u5728\u8fd9\u4e2a\u8868\u4e0a\u63d2\u5165\u6570\u636e\u3002<\/p>\n

2.\u8fdb\u884cinsert…select\u7684\u65f6\u5019\u53d1\u751f\u552f\u4e00\u952e\u51b2\u7a81<\/p>\n

\"\u56fe\u7247\"<\/p>\n

\u5728\u53ef\u91cd\u590d\u8bfb\u9694\u79bb\u7ea7\u522b\u4e0b,\u53ef\u4ee5\u770b\u51fasessionB\u7684insert\u8bed\u53e5\u8fdb\u5165\u4e86\u9501\u7b49\u5f85\u7684\u72b6\u6001<\/p>\n

\u4e5f\u5c31\u662f\u8bf4sessionA\u6267\u884c\u7684insert\u8bed\u53e5,\u53d1\u751f\u552f\u4e00\u952e\u51b2\u7a81\u7684\u65f6\u5019,\u5e76\u4e0d\u4f1a\u7b80\u5355\u7684\u62a5\u9519,\u800c\u662f\u5728\u51b2\u7a81\u7684\u7d22\u5f15\u4e0a\u52a0\u4e0a\u4e86\u9501,\u4e00\u4e2anext key lock\u662f\u7531\u5176\u53f3\u8fb9\u754c\u7684\u503c\u51b3\u5b9a\u7684,\u8fd9\u5c31\u662f\u52a0\u4e0a\u4e86(5,10]\u8fd9\u4e2a\u8bfb\u9501<\/p>\n

\u8fd9\u4e2a\u52a0\u9501\u7684\u89c4\u5219,\u4e0d\u4ec5\u4ec5\u5bf9\u552f\u4e00\u7d22\u5f15\u6709\u7528,\u5bf9\u4e3b\u952e\u7d22\u5f15\u540c\u6837\u6709\u7528<\/p>\n

\u6216\u8005\u63d2\u5165\u5e26\u6709\u552f\u4e00\u952e\u7684\u8868,\u4e5f\u4f1a\u5bfc\u81f4<\/p>\n

\"\u56fe\u7247\"<\/p>\n

\u6267\u884c\u5982\u4e0a\u7684\u8bed\u53e5\u6d41\u7a0b,\u5728sessionA\u4e2d,\u5148\u52a0\u5165\u4e86next key lock(0,5],\u4f46\u662f\u56e0\u4e3a\u662f\u552f\u4e00\u7d22\u5f15,\u9000\u5316\u4e3a\u4e86\u8bb0\u5f55\u9501,\u5df2\u7ecf\u52a0\u4e0a\u4e86\u5199\u9501,\u4f46\u662f\u56e0\u4e3a\u4e8b\u52a1\u6ca1\u6709\u63d0\u4ea4,\u8fdf\u8fdf\u4e0d\u653e\u624b<\/p>\n

\u5728\u53d1\u751f\u4e3b\u952e\u51b2\u7a81\u7684\u65f6\u5019,\u4e0d\u4f1a\u7531next-key lock\u9000\u5316\u4e3a\u884c\u9501\u7684<\/p>\n

session B,C \u4e3a\u4e86\u4fdd\u8bc1\u4e00\u884c\u6570\u636e\u7684\u5b58\u5728,\u4e8e\u662f\u5bf9\u4e8e\u52a0\u4e0a\u4e86\u8bfb\u9501,\u867d\u7136\u6ca1\u6709\u52a0\u4e0a\u8bfb\u9501,\u4f46\u662f\u52a0\u4e0a\u4e86gap lock<\/p>\n

\u5728T3\u65f6\u523b,sessionA\u56de\u6eda\u4e86,SessionB \u548cC,\u7ee7\u7eed\u8fdb\u884c\u63d2\u5165,\u90fd\u9700\u8981\u52a0\u4e0a\u5199\u9501,\u4f46\u9700\u8981\u7b49\u5f85\u5bf9\u65b9\u7684\u884c\u9501,\u4e8e\u662f\u5bfc\u81f4\u6b7b\u9501<\/p>\n

\"\u56fe\u7247\"<\/p>\n

insert into …on duplicate key update<\/p>\n

\u8fd9\u4e2a\u4f8b\u5b50\u662f\u4e3b\u952e\u51b2\u7a81\u540e\u62a5\u9519,\u53ef\u4ee5\u6539\u5199\u4e3a\u4e0b\u9762\u7684\u8bed\u53e5,\u4f7f\u7528\u4e0aon duplicate key update\u8bed\u6cd5<\/p>\n

\u8fd9\u4e2a\u8bed\u6cd5\u662f\u63d2\u5165\u4e00\u884c\u6570\u636e,\u5982\u679c\u9047\u5230\u4e86\u552f\u4e00\u952e\u7ea6\u675f,\u5c31\u6267\u884c\u540e\u9762\u7684\u66f4\u65b0<\/p>\n

\u90a3\u4e48\u6267\u884c\u5982\u4e0b\u7684\u8bed\u53e5<\/p>\n

insert into t values(2,1,10) on duplicate key update d=100;<\/p>\n

\u73b0\u5728\u8868t1 t2\u4e2d\u5df2\u7ecf\u6709(1,1,1)(2,2,2)\u4e24\u884c\u6570\u636e\u4e86<\/p>\n

\u8fd9\u4e2a\u8bed\u53e5\u7684\u6267\u884c\u4e3a<\/p>\n

\"\u56fe\u7247\"<\/p>\n

MySQL\u5148\u5224\u65ad\u4e86id\u8fd9\u4e00\u4e2a\u4e3b\u952e\u7d22\u5f15,\u7136\u540e\u4fee\u6539\u4e86id=2\u7684\u884c<\/p>\n

\u4f46\u662fMySQL\u4e2d,\u6267\u884c\u8fd9\u4e2a\u8bed\u53e5\u8fd4\u56de\u7684affected rows\u662f2,\u770b\u8d77\u6765\u66f4\u65b0\u4e86\u4e24\u884c,\u5b9e\u9645\u4e0a\u53ea\u66f4\u65b0\u4e86\u4e00\u884c<\/p>\n

\u4eca\u65e5\u7684\u603b\u7ed3,\u4ecb\u7ecd\u4e86\u51e0\u79cd\u7279\u6b8a\u60c5\u51b5\u4e0b\u7684insert\u8bed\u53e5<\/p>\n

insert…select\u8bed\u53e5,\u4f1a\u7ed9\u626b\u63cf\u5230\u7684\u8bb0\u5f55\u52a0\u4e0a\u95f4\u9699\u9501\u548c\u8bfb\u9501<\/p>\n

insert\u8bed\u53e5\u51fa\u73b0\u552f\u4e00\u952e\u51b2\u7a81,\u4f1a\u7ed9\u51b2\u7a81\u7684\u552f\u4e00\u503c\u4e0a,\u52a0\u4e0a\u5171\u4eab\u7684next-key-lock<\/p>\n","protected":false},"excerpt":{"rendered":"

insert\u8bed\u53e5\u672c\u6765\u662f\u4e00\u4e2a\u8f7b\u91cf […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"_links":{"self":[{"href":"http:\/\/xinblog.ltd\/index.php?rest_route=\/wp\/v2\/posts\/1822"}],"collection":[{"href":"http:\/\/xinblog.ltd\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/xinblog.ltd\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/xinblog.ltd\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/xinblog.ltd\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1822"}],"version-history":[{"count":0,"href":"http:\/\/xinblog.ltd\/index.php?rest_route=\/wp\/v2\/posts\/1822\/revisions"}],"wp:attachment":[{"href":"http:\/\/xinblog.ltd\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1822"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/xinblog.ltd\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1822"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/xinblog.ltd\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1822"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}