{"id":333185,"date":"2021-02-08T18:00:37","date_gmt":"2021-02-08T10:00:37","guid":{"rendered":"http:\/\/4563.org\/?p=333185"},"modified":"2021-02-08T18:00:37","modified_gmt":"2021-02-08T10:00:37","slug":"mysql-%e9%87%8c-%e9%9d%9e%e4%ba%8b%e5%8a%a1%e7%9a%84-update-%e8%af%ad%e5%8f%a5%ef%bc%8c%e4%bc%9a%e8%87%aa%e5%8a%a8%e5%8a%a0%e6%8e%92%e5%ae%83%e9%94%81%e5%90%97","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=333185","title":{"rendered":"mysql \u91cc \u975e\u4e8b\u52a1\u7684 update \u8bed\u53e5\uff0c\u4f1a\u81ea\u52a8\u52a0\u6392\u5b83\u9501\u5417"},"content":{"rendered":"
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mysql \u91cc \u975e\u4e8b\u52a1\u7684 update \u8bed\u53e5\uff0c\u4f1a\u81ea\u52a8\u52a0\u6392\u5b83\u9501\u5417 <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span> <\/i> 1<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u6ca1\u67e5\u5230\u76f8\u5173\u8d44\u6599<\/p>\n

\u662f\u6211\u7406\u89e3\u9519\u4e86\u5417<\/p>\n

\u5927\u591a\u6570\u4e66 \u6559\u7a0b\u90fd\u8bf4\u7684\u662f\u4e8b\u52a1\u7684\u60c5\u51b5<\/p>\n

\u7136\u540e\u5728\u4e8b\u52a1\u4e2d\uff0c\u5230\u5e95\u8981\u4e0d\u8981\u624b\u52a8\u5199 FOR UPDATE \u6216 LOCK IN SHARE MODE \u6765\u52a0\u9501\u5462\uff1f\u8fd8\u662f\u8bf4 mysql \u4f1a\u81ea\u52a8\u6839\u636e\u67e5\u8be2\u8bed\u53e5\u7684\u7c7b\u522b\u6765\u52a0\u9501\uff1f<\/p>\n<\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (4<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : louettagfh <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4f60\u662f\u6307\u6ca1\u6709\u663e\u5f0f\u7684 begin \u5417?<\/p>\n

    update \u8bed\u53e5\u4f9d\u7136\u9700\u8981\u6392\u5b83\u9501.<\/p>\n

    \u4e8b\u52a1\u4e2d\u5199\u4e0d\u5199 FOR UPDATE \u548c LOCK IN SHARE MODE \u53d6\u51b3\u4e8e\u4f60\u7684\u9700\u6c42\u554a. <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @louettagfh \u5bf9 \u5c31\u662f\u6ca1\u6709\u663e\u5f0f\u7684\u5f00\u542f\u4e8b\u52a1\uff0c\u8fd9\u65f6\u5019 update \u4f1a\u81ea\u52a8\u5f53\u505a\u4e00\u4e2a\u4e8b\u52a1\u5417\uff1f
    \u6240\u4ee5\u4e8b\u52a1\u4e2d\u5176\u5b9e\u662f\u4e0d\u4f1a\u81ea\u52a8\u52a0\u9501\u7684\u5417\uff1f\u5fc5\u987b\u81ea\u5df1\u624b\u52a8\u663e\u5f0f\u52a0\u9501\uff1f\uff08\u5bf9\u4e8e innodb \uff09 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : lizuoqiang <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    session 1:
    #\u5173\u95ed\u81ea\u52a8\u63d0\u4ea4
    set autocommit = ‘OFF’;
    #\u66f4\u65b0\u4e00\u6761\u8bb0\u5f55
    update author set name = ‘first_new’ where id = 1;<\/p>\n

    session 2:
    #\u5173\u95ed\u81ea\u52a8\u63d0\u4ea4
    set autocommit = ‘OFF’;
    #\u66f4\u65b0\u4e00\u6761\u8bb0\u5f55
    update author set name = ‘first_new_2’ where id = 1;<\/p>\n

    session2 \u4f1a\u7b49\u5f85 session1 \u7684\u9501\u91ca\u653e\u800c\u5bfc\u81f4\u8d85\u65f6<\/p>\n

    \u6240\u4ee5\u4e00\u822c\u7684\u4e8b\u7269\u4e0d\u9700\u8981\u663e\u793a\u7684\u52a0\u9501 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : louettagfh <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @zxCoder \u9488\u5bf9 SELECT \u5f53\u7136\u662f\u53d6\u51b3\u4e8e\u4f60\u7684\u8bed\u53e5\u6765\u51b3\u5b9a\u52a0\u4ec0\u4e48\u9501.<\/p>\n

    Update \u5373\u4fee\u6539 record \u662f\u81ea\u52a8\u52a0\u9501\u7684, \u4f60\u4e0d\u9700\u8981\u505a\u4efb\u4f55\u5904\u7406. <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n","protected":false},"excerpt":{"rendered":"

    mysql \u91cc \u975e\u4e8b\u52a1\u7684 upda…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/333185"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=333185"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/333185\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=333185"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=333185"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=333185"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}