{"id":200476,"date":"2025-05-06T09:47:29","date_gmt":"2025-05-06T01:47:29","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200476\/"},"modified":"2025-05-06T09:47:29","modified_gmt":"2025-05-06T01:47:29","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8sql%e5%8a%a8%e6%80%81%e7%bb%9f%e8%ae%a1%e5%a4%9a%e4%b8%aa%e5%9f%8e%e5%b8%82%e7%9a%84%e7%bb%93%e6%9e%9c%e7%8a%b6%e6%80%81%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200476\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528SQL\u52a8\u6001\u7edf\u8ba1\u591a\u4e2a\u57ce\u5e02\u7684\u7ed3\u679c\u72b6\u6001\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u5982\u4f55\u4f7f\u7528SQL\u52a8\u6001\u7edf\u8ba1\u591a\u4e2a\u57ce\u5e02\u7684\u7ed3\u679c\u72b6\u6001\uff1f<\/h1>\n<p>\u6765\u5230\u4e3b\u673a\u5b9d\u8d1d\u7684\u5927\u5bb6\uff0c\u76f8\u4fe1\u90fd\u662f\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5e0c\u671b\u5728\u8fd9\u91cc\u5b66\u4e60\u6570\u636e\u5e93\u76f8\u5173\u7f16\u7a0b\u77e5\u8bc6\u3002\u4e0b\u9762\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u5e26\u5927\u5bb6\u804a\u804a\u300a\u5982\u4f55\u4f7f\u7528SQL\u52a8\u6001\u7edf\u8ba1\u591a\u4e2a\u57ce\u5e02\u7684\u7ed3\u679c\u72b6\u6001\uff1f\u300b\uff0c\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5b9e\u6218\u5f00\u53d1\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241106\/1730858433672acdc14f193.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>sql\u7edf\u8ba1\u4e0d\u540c\u5730\u5e02\u7ed3\u679c\u72b6\u6001<\/strong><\/p>\n<p><strong>\u95ee\u9898\uff1a<\/strong><\/p>\n<p>\u5f53\u9700\u8981\u7edf\u8ba1\u5927\u91cf\u4e0d\u540c\u5730\u5e02\u7684\u7ed3\u679c\u72b6\u6001\u65f6\uff0c\u5982\u4f55\u907f\u514d\u624b\u52a8\u5199\u6b7b\u6bcf\u4e2a\u57ce\u5e02id\uff0c\u5b9e\u73b0\u66f4\u7075\u6d3b\u7684\u52a8\u6001\u67e5\u8be2\uff1f<\/p>\n<p><strong>\u89e3\u7b54\uff1a<\/strong><\/p>\n<p>\u4f7f\u7528 foreach \u5faa\u73af\u4ee3\u66ff\u5199\u6b7b\u7684\u57ce\u5e02id\u4ee3\u7801\uff0c\u901a\u8fc7\u4f20\u5165\u53c2\u6570\u6765\u6307\u5b9a\u9700\u8981\u7edf\u8ba1\u7684\u57ce\u5e02\u3002<\/p>\n<p><strong>\u4ee3\u7801\uff1a<\/strong><\/p>\n<pre># \u4f7f\u7528foreach\u4ee3\u66ff\u5199\u6b7b\u4ee3\u7801\uff0c\u901a\u8fc7\u4f20\u53c2\u6570\u53d8\u66f4\u8981\u7edf\u8ba1\u7684\u57ce\u5e02\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;<\/pre>\n<p>\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 java \u4ee3\u7801\u6216 sql \u811a\u672c\u5c06\u57ce\u5e02id\u5217\u8868\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9 sql \u67e5\u8be2\uff0c\u4ece\u800c\u52a8\u6001\u751f\u6210\u7edf\u8ba1\u7ed3\u679c\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a java \u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n<pre>\/\/ \u6784\u5efa\u57ce\u5e02ID\u5217\u8868\nList&lt;String&gt; cityIds = new ArrayList&lt;&gt;();\n\/\/ ...\n\n\/\/ \u6784\u5efa\u67e5\u8be2\u8bed\u53e5\nString query = \"SELECT\\n\" +\n    \"    result_status,\\n\" +\n    \"&lt;foreach collection=\\\"cityIds\\\" item=\\\"cityId\\\"&gt;\\n\" +\n    \"    COUNT(CASE WHEN city = #{cityId} THEN city END ) AS ${cityId},\\n\" +\n    \"&lt;\/foreach&gt;\\n\" +\n    \"FROM\\n\" +\n    \"    sys_patrol\\n\" +\n    \"WHERE\\n\" +\n    \"    YEAR ( start_patrol_time ) = '2021'\\n\" +\n    \"GROUP BY\\n\" +\n    \"    result_status\";\n\n\/\/ \u6267\u884c\u67e5\u8be2\nList&lt;Result&gt; results = jdbcTemplate.query(query, new BeanPropertyRowMapper&lt;&gt;(Result.class), cityIds);<\/pre>\n<p>\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6570\u636e\u5e93\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u4f7f\u7528SQL\u52a8\u6001\u7edf\u8ba1\u591a\u4e2a\u57ce\u5e02\u7684&#46;&#46;&#46;<\/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-200476","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200476","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=200476"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200476\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200476"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200476"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200476"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}