{"id":200733,"date":"2025-05-06T13:32:30","date_gmt":"2025-05-06T05:32:30","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200733\/"},"modified":"2025-05-06T13:32:30","modified_gmt":"2025-05-06T05:32:30","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-mybatis-%e7%9a%84-if-%e8%af%ad%e5%8f%a5%e5%8a%a8%e6%80%81%e6%9b%b4%e6%96%b0%e5%88%97%e8%a1%a8%e4%b8%ad%e7%9a%84%e6%8c%87%e5%ae%9a%e5%ad%97%e6%ae%b5%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200733\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528 mybatis \u7684 IF \u8bed\u53e5\u52a8\u6001\u66f4\u65b0\u5217\u8868\u4e2d\u7684\u6307\u5b9a\u5b57\u6bb5\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u5982\u4f55\u4f7f\u7528 mybatis \u7684 IF \u8bed\u53e5\u52a8\u6001\u66f4\u65b0\u5217\u8868\u4e2d\u7684\u6307\u5b9a\u5b57\u6bb5\uff1f<\/h1>\n<p>\u76ee\u524d\u4e3b\u673a\u5b9d\u8d1d\u4e0a\u5df2\u7ecf\u6709\u5f88\u591a\u5173\u4e8e\u7684\u6587\u7ae0\u4e86\uff0c\u81ea\u5df1\u5728\u521d\u6b21\u9605\u8bfb\u8fd9\u4e9b\u6587\u7ae0\u4e2d\uff0c\u4e5f\u89c1\u8bc6\u5230\u4e86\u5f88\u591a\u5b66\u4e60\u601d\u8def\uff1b\u90a3\u4e48\u672c\u6587\uff0c\u4e5f\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u5927\u5bb6\uff0c\u5982\u679c\u9605\u8bfb\u5b8c\u540e\u771f\u7684\u5bf9\u4f60\u5b66\u4e60\u6709\u5e2e\u52a9\uff0c\u6b22\u8fce\u52a8\u52a8\u624b\u6307\uff0c\u8bc4\u8bba\u7559\u8a00\u5e76\u5206\u4eab~<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241112\/1731418590673359de975ae.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u4f7f\u7528 sql \u4e2d\u7684 if \u5224\u65ad\u67d0\u4e2a\u5b57\u6bb5\u662f\u5426\u5728\u5217\u8868\u4e2d<\/strong><\/p>\n<p>\u5728\u8fdb\u884c\u6279\u91cf\u66f4\u65b0\u65f6\uff0c\u5982\u679c\u9700\u8981\u57fa\u4e8e\u5b57\u6bb5\u540d\u52a8\u6001\u66f4\u65b0\u6570\u636e\uff0c\u53ef\u4ee5\u4f7f\u7528 sql \u4e2d\u7684 if \u8bed\u53e5\u6765\u5224\u65ad\u67d0\u4e2a\u5b57\u6bb5\u662f\u5426\u5305\u542b\u5728\u6307\u5b9a\u7684\u5217\u8868\u4e2d\u3002<\/p>\n<p>\u6839\u636e\u7ed9\u5b9a\u7684\u573a\u666f\uff0c\u6211\u4eec\u5047\u8bbe\u4f7f\u7528\u7684\u662f java \u4e2d\u7684 mybatis orm \u6846\u67b6\uff0c\u6279\u91cf\u66f4\u65b0\u65b9\u6cd5\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1a<\/p>\n<ul>\n<li>entitylist: \u5f85\u66f4\u65b0\u6570\u636e\u7684\u5bf9\u8c61\u5217\u8868<\/li>\n<li>fieldnameslist: \u9700\u8981\u66f4\u65b0\u7684\u5b57\u6bb5\u540d\u5217\u8868<\/li>\n<\/ul>\n<p>\u4e3a\u4e86\u52a8\u6001\u66f4\u65b0 schoolno \u548c schoolrank \u5b57\u6bb5\uff0c\u53ef\u4ee5\u5c06 sql \u8bed\u53e5\u7f16\u5199\u5982\u4e0b\uff1a<\/p>\n<pre>&lt;update id=\"batchUpdateById\"&gt;\n    &lt;foreach collection=\"entityList\" item=\"entity\" index=\"index1\" open=\"(\" close=\")\" separator=\";\"&gt;\n        UPDATE school_info SET\n        &lt;if test='fieldNamesList.contains(\"schoolNo\")'&gt;\n            schoolNo = #{entity.getSchoolNo}\n        &lt;\/if&gt;\n        &lt;if test='fieldNamesList.contains(\"schoolRank\")'&gt;\n            schoolRank = #{entity.getSchoolRank}\n        &lt;\/if&gt;\n        WHERE dataId = #{entity.dataId}\n    &lt;\/foreach&gt;\n&lt;\/update&gt;<\/pre>\n<p>\u5728 if \u8bed\u53e5\u4e2d\uff0cfieldnameslist.contains(&#8220;schoolno&#8221;) \u5224\u65ad\u6307\u5b9a\u7684\u5b57\u6bb5\u540d\u5217\u8868\u662f\u5426\u5305\u542b &#8220;schoolno&#8221;\uff0c\u5982\u679c\u5305\u542b\uff0c\u5219\u66f4\u65b0\u8be5\u5b57\u6bb5\u3002\u540c\u7406\uff0c\u4e5f\u53ef\u4ee5\u5224\u65ad\u5176\u4ed6\u5b57\u6bb5\u540d\u5e76\u8fdb\u884c\u76f8\u5e94\u66f4\u65b0\u3002<\/p>\n<p>\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u5728 mybatis \u4e2d\u9700\u8981\u4f7f\u7528 contains \u65b9\u6cd5\u6765\u5224\u65ad\u5217\u8868\u4e2d\u662f\u5426\u5305\u542b\u67d0\u4e2a\u5143\u7d20\u3002<\/p>\n<p>\u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300a\u5982\u4f55\u4f7f\u7528 mybatis \u7684 IF \u8bed\u53e5\u52a8\u6001\u66f4\u65b0\u5217\u8868\u4e2d\u7684\u6307\u5b9a\u5b57\u6bb5\uff1f\u300b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u5927\u5bb6\u90fd\u638c\u63e1\u4e86\u5427\uff01\u5982\u679c\u60f3\u8981\u7ee7\u7eed\u63d0\u5347\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u90a3\u4e48\u5c31\u6765\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u5427\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u4f7f\u7528 mybatis \u7684 I&#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-200733","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200733","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=200733"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200733\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200733"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200733"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200733"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}