{"id":6949,"date":"2024-11-14T09:17:30","date_gmt":"2024-11-14T01:17:30","guid":{"rendered":"https:\/\/fwq.ai\/blog\/6949\/"},"modified":"2024-11-14T09:17:30","modified_gmt":"2024-11-14T01:17:30","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8foreach%e5%be%aa%e7%8e%af%e5%8a%a8%e6%80%81%e7%bb%9f%e8%ae%a1%e4%b8%8d%e5%90%8c%e5%9c%b0%e5%b8%82%e7%9a%84%e5%b7%a1%e6%9f%a5%e7%bb%93%e6%9e%9c%e7%8a%b6%e6%80%81","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/6949\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528foreach\u5faa\u73af\u52a8\u6001\u7edf\u8ba1\u4e0d\u540c\u5730\u5e02\u7684\u5de1\u67e5\u7ed3\u679c\u72b6\u6001\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173016901696249.jpg\" class=\"aligncenter\" title=\"\u5982\u4f55\u4f7f\u7528foreach\u5faa\u73af\u52a8\u6001\u7edf\u8ba1\u4e0d\u540c\u5730\u5e02\u7684\u5de1\u67e5\u7ed3\u679c\u72b6\u6001\uff1f\u63d2\u56fe\" alt=\"\u5982\u4f55\u4f7f\u7528foreach\u5faa\u73af\u52a8\u6001\u7edf\u8ba1\u4e0d\u540c\u5730\u5e02\u7684\u5de1\u67e5\u7ed3\u679c\u72b6\u6001\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>sql\u67e5\u8be2\u7edf\u8ba1\u4e0d\u540c\u5730\u5e02\u7ed3\u679c\u72b6\u6001<\/strong><\/p>\n<p>\u5728\u9700\u8981\u7edf\u8ba1\u4e0d\u540c\u5730\u5e02\u7684\u7ed3\u679c\u72b6\u6001\uff0c\u4f46\u57ce\u5e02\u79cd\u7c7b\u7e41\u591a\u65f6\uff0c\u4e3a\u4e86\u907f\u514d\u5199\u6b7b\u4ee3\u7801\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528foreach\u5faa\u73af\u6765\u5b9e\u73b0\u67e5\u8be2\u7ed3\u679c\u7684\u52a8\u6001\u751f\u6210\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u4fee\u6539\u539f\u59cb\uff1a<\/p>\n<pre>SELECT\n    result_status,\n    &lt;foreach collection=\"citys\" item=\"city\"&gt;\n        COUNT(CASE WHEN city = #{city.id} THEN city END ) AS city.name,\n    &lt;\/foreach&gt;\nFROM\n    sys_patrol \nWHERE\n    YEAR ( start_patrol_time ) = '2021' \nGROUP BY\n    result_status<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5176\u4e2d\uff1a&#8221;citys&#8221;\u662f\u4e00\u4e2a\u81ea\u5b9a\u4e49\u53c2\u6570\u5217\u8868\uff0c\u5b83\u5305\u542b\u4e86\u9700\u8981\u7edf\u8ba1\u7684\u57ce\u5e02id\u548c\u540d\u79f0\u3002&#8221;city.id&#8221;\u548c&#8221;city.name&#8221;\u5206\u522b\u8868\u793a\u57ce\u5e02id\u548c\u57ce\u5e02\u540d\u79f0\u3002\u901a\u8fc7\u5728foreach\u5faa\u73af\u4e2d\u904d\u5386citys\u5217\u8868\uff0c\u53ef\u4ee5\u52a8\u6001\u5730\u751f\u6210\u7edf\u8ba1\u9879\uff0c\u907f\u514d\u4e86\u5199\u6b7b\u4ee3\u7801\uff0c\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u4f7f\u7528foreach\u5faa\u73af\u52a8\u6001\u7edf\u8ba1\u4e0d\u540c\u5730\u5e02\u7684\u5de1\u67e5\u7ed3\u679c\u72b6\u6001\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":"<p>sql\u67e5\u8be2\u7edf\u8ba1\u4e0d\u540c\u5730\u5e02\u7ed3\u679c\u72b6\u6001 \u5728\u9700\u8981\u7edf\u8ba1\u4e0d\u540c\u5730\u5e02\u7684\u7ed3\u679c\u72b6\u6001\uff0c\u4f46\u57ce\u5e02\u79cd\u7c7b\u7e41\u591a\u65f6\uff0c\u4e3a\u4e86\u907f\u514d\u5199\u6b7b\u4ee3\u7801\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528foreach\u5faa\u73af\u6765\u5b9e\u73b0\u67e5\u8be2\u7ed3\u679c\u7684\u52a8\u6001\u751f\u6210\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u4fee\u6539\u539f\u59cb\uff1a SELECT result_status, &lt;foreach collection=&#8221;citys&#8221; item=&#8221;city&#8221;&gt; COUNT(CASE WHEN city = #{city.id} THEN city END ) AS city.name, &lt;\/foreach&gt; FROM sys_patrol WHERE YEAR ( start_patrol_time ) = &#8216;2021&#8217; GROUP BY result_status \u767b\u5f55\u540e\u590d\u5236 \u5176\u4e2d\uff1a&#8221;citys&#8221;\u662f\u4e00\u4e2a\u81ea\u5b9a\u4e49\u53c2\u6570\u5217\u8868\uff0c\u5b83\u5305\u542b\u4e86\u9700\u8981\u7edf\u8ba1\u7684\u57ce\u5e02id\u548c\u540d\u79f0\u3002&#8221;city.id&#8221;\u548c&#8221;city.name&#8221;\u5206\u522b\u8868\u793a\u57ce\u5e02id\u548c\u57ce\u5e02\u540d\u79f0\u3002\u901a\u8fc7\u5728foreach\u5faa\u73af\u4e2d\u904d\u5386citys\u5217\u8868\uff0c\u53ef\u4ee5\u52a8\u6001\u5730\u751f\u6210\u7edf\u8ba1\u9879\uff0c\u907f\u514d\u4e86\u5199\u6b7b\u4ee3\u7801\uff0c\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u3002 \u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u4f7f\u7528foreach\u5faa\u73af\u52a8\u6001\u7edf\u8ba1\u4e0d\u540c\u5730\u5e02\u7684\u5de1\u67e5\u7ed3\u679c\u72b6\u6001\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},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-6949","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6949","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=6949"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6949\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=6949"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=6949"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=6949"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}