{"id":201018,"date":"2025-05-06T15:26:04","date_gmt":"2025-05-06T07:26:04","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201018\/"},"modified":"2025-05-06T15:26:04","modified_gmt":"2025-05-06T07:26:04","slug":"mysql-%e6%9f%a5%e8%af%a2%e4%b8%ad%e5%88%ab%e5%90%8d-temp-%e4%b8%ba%e4%bd%95%e8%bf%94%e5%9b%9e-null%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201018\/","title":{"rendered":"MySQL \u67e5\u8be2\u4e2d\u522b\u540d temp \u4e3a\u4f55\u8fd4\u56de NULL\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

MySQL \u67e5\u8be2\u4e2d\u522b\u540d temp \u4e3a\u4f55\u8fd4\u56de NULL\uff1f<\/h1>\n

\u5728\u6570\u636e\u5e93\u5b9e\u6218\u5f00\u53d1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u4e00\u4e9b\u8fd9\u6837\u90a3\u6837\u7684\u95ee\u9898\uff0c\u7136\u540e\u8981\u5361\u597d\u534a\u5929\uff0c\u7b49\u95ee\u9898\u89e3\u51b3\u4e86\u624d\u53d1\u73b0\u539f\u6765\u4e00\u4e9b\u7ec6\u8282\u77e5\u8bc6\u70b9\u8fd8\u662f\u6ca1\u6709\u638c\u63e1\u597d\u3002\u4eca\u5929\u4e3b\u673a\u5b9d\u8d1d\u5c31\u6574\u7406\u5206\u4eab\u300aMySQL \u67e5\u8be2\u4e2d\u522b\u540d temp \u4e3a\u4f55\u8fd4\u56de NULL\uff1f\u300b\uff0c\u804a\u804a\uff0c\u5e0c\u671b\u53ef\u4ee5\u5e2e\u52a9\u5230\u6b63\u5728\u52aa\u529b\u8d5a\u94b1\u7684\u4f60\u3002<\/p>\n

<\/p>\n

mysql \u67e5\u8be2\u4e2d\u522b\u540d temp \u8fd4\u56de null<\/strong><\/p>\n

\u95ee\u9898\uff1a\u5728 mysql \u67e5\u8be2\u4e2d\uff0c\u4f7f\u7528\u4ee5\u4e0b\u8bed\u53e5\u67e5\u8be2\u522b\u540d\u4e3a temp \u7684\u5217\u65f6\uff0c\u5374\u8fd4\u56de\u4e86 null\uff1a<\/p>\n

select str_to_date(plan_start_time, '%h:%i:%s') as temp,plan_start_time from base_stop_calendar<\/pre>\n
\u80cc\u666f\u4fe1\u606f\uff1a<\/p>\n
    \n
  • temp \u662f\u522b\u540d\uff0c\u5e76\u975e\u622a\u56fe\u9519\u8bef\u3002<\/li>\n
  • plan_start_time \u662f varchar \u7c7b\u578b\u3002<\/li>\n<\/ul>\n
    \u89e3\u7b54\uff1a<\/p>\n
    \u5728\u63d0\u4f9b\u7684 sql \u8bed\u53e5\u4e2d\uff0c\u683c\u5f0f\u5316\u5b57\u7b26 “%h” \u7528\u4e8e\u8868\u793a\u5c0f\u65f6\uff0812 \u5c0f\u65f6\u5236\uff09\u3002\u7136\u800c\uff0cplan_start_time \u5217\u4e2d\u5b58\u50a8\u7684\u662f 24 \u5c0f\u65f6\u5236\u7684\u65f6\u95f4\uff0c\u56e0\u6b64\u4f7f\u7528 “%h” \u4f1a\u5bfc\u81f4\u683c\u5f0f\u5316\u5931\u8d25\uff0c\u4ece\u800c\u8fd4\u56de null\u3002<\/p>\n
    \u89e3\u51b3\u65b9\u6848\uff1a<\/p>\n
    \u8981\u6b63\u786e\u5730\u683c\u5f0f\u5316\u8ba1\u5212\u5f00\u59cb\u65f6\u95f4\uff0c\u5e94\u8be5\u4f7f\u7528\u5927\u5199\u5b57\u6bcd “h” \u6765\u8868\u793a 24 \u5c0f\u65f6\u5236\u7684\u65f6\u95f4\u3002\u4ee5\u4e0b\u662f\u4fee\u6539\u540e\u7684 sql \u8bed\u53e5\uff1a<\/p>\n
    SELECT STR_TO_DATE(plan_start_time, '%H:%i:%s') as temp,plan_start_time from base_stop_calendar<\/pre>\n
    \u4f7f\u7528\u6b64\u8bed\u53e5\u540e\uff0c\u522b\u540d temp \u5c06\u8fd4\u56de\u683c\u5f0f\u6b63\u786e\u7684\u65e5\u671f\u548c\u65f6\u95f4\u3002<\/p>\n
    \u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300aMySQL \u67e5\u8be2\u4e2d\u522b\u540d temp \u4e3a\u4f55\u8fd4\u56de NULL\uff1f\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n
    \n
    \n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
    MySQL \u67e5\u8be2\u4e2d\u522b\u540d temp...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-201018","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201018","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=201018"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201018\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201018"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201018"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201018"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}