{"id":6922,"date":"2024-11-14T08:19:19","date_gmt":"2024-11-14T00:19:19","guid":{"rendered":"https:\/\/fwq.ai\/blog\/6922\/"},"modified":"2024-11-14T08:19:19","modified_gmt":"2024-11-14T00:19:19","slug":"mysql-%e6%97%a5%e6%9c%9f%e5%ad%97%e6%ae%b5%e8%a2%ab%e7%bd%ae%e4%b8%ba-null-%e5%a6%82%e4%bd%95%e6%8e%92%e6%9f%a5%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/6922\/","title":{"rendered":"MySQL \u65e5\u671f\u5b57\u6bb5\u88ab\u7f6e\u4e3a NULL \u5982\u4f55\u6392\u67e5\uff1f"},"content":{"rendered":"

\"MySQL<\/p>\n

\u5982\u4f55\u6392\u67e5 \u8868\u4e2d\u5b57\u6bb5\u88ab\u7f6e\u4e3a null \u7684\u95ee\u9898\uff1f<\/strong><\/p>\n

\u5728 spring boot \u548c mysql 5.7 \u7684\u9879\u76ee\u4e2d\uff0c\u67d0\u4e2a\u8868\u4e2d\u7684\u65e5\u671f\u5b57\u6bb5\u51fa\u73b0\u4e86\u88ab\u4fee\u6539\u4e3a null \u7684\u95ee\u9898\uff0c\u6e90\u81ea\u672a\u77e5\u7684\u73af\u8282\u3002\u4e3a\u4e86\u89e3\u51b3\u8be5\u95ee\u9898\uff0c\u8003\u8651\u4ee5\u4e0b\u6392\u67e5\u9014\u5f84\uff1a<\/p>\n

\u76d1\u63a7\u8868\u5b57\u6bb5\u53d8\u52a8<\/strong><\/p>\n

\u786e\u5b9e\u53ef\u4ee5\u8003\u8651\u76d1\u63a7\u6307\u5b9a\u8868\u7684\u5b57\u6bb5\u53d8\u52a8\u60c5\u51b5\u3002\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528 mysql \u7684\u89e6\u53d1\u5668\uff08triggers\uff09\u6765\u8bb0\u5f55\u6bcf\u6b21\u5b57\u6bb5\u503c\u7684\u4fee\u6539\u3002\u5f53\u5b57\u6bb5\u88ab\u4fee\u6539\u65f6\uff0c\u89e6\u53d1\u5668\u53ef\u4ee5\u5411\u4f60\u53d1\u9001\u7535\u5b50\u90ae\u4ef6\u6216\u5176\u4ed6\u901a\u77e5\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\u89e6\u53d1\u5668\u4ee3\u7801\uff1a<\/p>\n

delimiter $$\ncreate trigger trigger_name after update on table_name\nfor each row\nbegin\n  -- \u53d1\u9001\u7535\u5b50\u90ae\u4ef6\u901a\u77e5\n  set @email = 'example@email.com';\n  set @subject = 'field updated to null';\n  set @message = concat('the field ', old.column_name, ' in table ', table_name, ' was updated to null.');\n  call mysql.rds_send_mail(@email, @subject, @message);\nend$$\ndelimiter ;<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u5728\u89e6\u53d1\u5668\u521b\u5efa\u540e\uff0c\u8bf7\u8bb0\u4f4f\u5728\u5b57\u6bb5\u53d1\u751f\u4fee\u6539\u65f6\u68c0\u67e5\u4f60\u7684\u901a\u77e5\u3002<\/p>\n
\u68c0\u67e5\u4e8c\u8fdb\u5236\u65e5\u5fd7<\/strong><\/p>\n
mysql \u7684\u4e8c\u8fdb\u5236\u65e5\u5fd7\u8bb0\u5f55\u4e86\u5bf9\u6570\u636e\u5e93\u6240\u505a\u7684\u6240\u6709\u66f4\u6539\u3002\u4f60\u53ef\u4ee5\u67e5\u627e\u7279\u5b9a\u8868\u7684\u5173\u952e\u5b57\uff0c\u770b\u770b\u54ea\u6761 sql \u8bed\u53e5\u5c06\u5b57\u6bb5\u6539\u6210\u4e86 null\u3002\u8981\u6267\u884c\u6b64\u64cd\u4f5c\uff0c\u8bf7\u8f6c\u5230 mysql \u547d\u4ee4\u884c\u5e76\u8fd0\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n
mysqlbinlog \/path\/to\/binary-log.000001 | grep -E \"table_name|column_name|NULL\"<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u8fd9\u5c06\u8fc7\u6ee4\u4e8c\u8fdb\u5236\u65e5\u5fd7\uff0c\u4ec5\u663e\u793a\u4e0e\u76ee\u6807\u8868\u548c\u5b57\u6bb5\u76f8\u5173\u7684\u6761\u76ee\uff0c\u5e2e\u52a9\u4f60\u627e\u51fa\u5bfc\u81f4\u95ee\u9898\u7684 sql \u8bed\u53e5\u3002<\/p>\n
\u4ee5\u4e0a\u5c31\u662fMySQL \u65e5\u671f\u5b57\u6bb5\u88ab\u7f6e\u4e3a NULL \u5982\u4f55\u6392\u67e5\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5982\u4f55\u6392\u67e5 \u8868\u4e2d\u5b57\u6bb5\u88ab\u7f6e\u4e3a null \u7684\u95ee\u9898\uff1f \u5728 spring boot \u548c mysql 5.7 \u7684\u9879\u76ee\u4e2d\uff0c\u67d0\u4e2a\u8868\u4e2d\u7684\u65e5\u671f\u5b57\u6bb5\u51fa\u73b0\u4e86\u88ab\u4fee\u6539\u4e3a null \u7684\u95ee\u9898\uff0c\u6e90\u81ea\u672a\u77e5\u7684\u73af\u8282\u3002\u4e3a\u4e86\u89e3\u51b3\u8be5\u95ee\u9898\uff0c\u8003\u8651\u4ee5\u4e0b\u6392\u67e5\u9014\u5f84\uff1a \u76d1\u63a7\u8868\u5b57\u6bb5\u53d8\u52a8 \u786e\u5b9e\u53ef\u4ee5\u8003\u8651\u76d1\u63a7\u6307\u5b9a\u8868\u7684\u5b57\u6bb5\u53d8\u52a8\u60c5\u51b5\u3002\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528 mysql \u7684\u89e6\u53d1\u5668\uff08triggers\uff09\u6765\u8bb0\u5f55\u6bcf\u6b21\u5b57\u6bb5\u503c\u7684\u4fee\u6539\u3002\u5f53\u5b57\u6bb5\u88ab\u4fee\u6539\u65f6\uff0c\u89e6\u53d1\u5668\u53ef\u4ee5\u5411\u4f60\u53d1\u9001\u7535\u5b50\u90ae\u4ef6\u6216\u5176\u4ed6\u901a\u77e5\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\u89e6\u53d1\u5668\u4ee3\u7801\uff1a delimiter $$ create trigger trigger_name after update on table_name for each row begin — \u53d1\u9001\u7535\u5b50\u90ae\u4ef6\u901a\u77e5 set @email = ‘example@email.com’; set @subject = ‘field updated to null’; set @message = concat(‘the field ‘, old.column_name, ‘ in table ‘, table_name, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-6922","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6922","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=6922"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6922\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=6922"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=6922"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=6922"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}