{"id":203913,"date":"2025-05-22T08:36:20","date_gmt":"2025-05-22T00:36:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203913\/"},"modified":"2025-05-22T08:36:20","modified_gmt":"2025-05-22T00:36:20","slug":"commons-dbutils%e6%b3%9b%e5%9e%8b%e6%96%b9%e6%b3%95%ef%bc%9a%e6%96%b9%e6%b3%95%e4%b8%80%e5%92%8c%e6%96%b9%e6%b3%95%e4%ba%8c%e6%9c%89%e4%bd%95%e5%8c%ba%e5%88%ab%e5%8f%8a%e6%bd%9c%e5%9c%a8%e9%a3%8e","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203913\/","title":{"rendered":"Commons-Dbutils\u6cdb\u578b\u65b9\u6cd5\uff1a\u65b9\u6cd5\u4e00\u548c\u65b9\u6cd5\u4e8c\u6709\u4f55\u533a\u522b\u53ca\u6f5c\u5728\u98ce\u9669\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Commons-Dbutils\u6cdb\u578b\u65b9\u6cd5\uff1a\u65b9\u6cd5\u4e00\u548c\u65b9\u6cd5\u4e8c\u6709\u4f55\u533a\u522b\u53ca\u6f5c\u5728\u98ce\u9669\uff1f<\/h1>\n<p>\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u6253\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aCommons-Dbutils\u6cdb\u578b\u65b9\u6cd5\uff1a\u65b9\u6cd5\u4e00\u548c\u65b9\u6cd5\u4e8c\u6709\u4f55\u533a\u522b\u53ca\u6f5c\u5728\u98ce\u9669\uff1f\u300b<\/span>\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\u5427\uff01\u6587\u4e2d\u5185\u5bb9\u5305\u542b<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9&#8230;\u5e0c\u671b\u4f60\u80fd\u5728\u9605\u8bfb\u672c\u6587\u540e\uff0c\u80fd\u771f\u771f\u5b9e\u5b9e\u5b66\u5230\u77e5\u8bc6\u6216\u8005\u5e2e\u4f60\u89e3\u51b3\u5fc3\u4e2d\u7684\u7591\u60d1\uff0c\u4e5f\u6b22\u8fce\u5927\u4f6c\u6216\u8005\u65b0\u4eba\u670b\u53cb\u4eec\u591a\u7559\u8a00\u8bc4\u8bba\uff0c\u591a\u7ed9\u5efa\u8bae\uff01\u8c22\u8c22\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241130\/1732969488674b04101ba4c.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>commons-dbutils\u6cdb\u578b\u9677\u9631<\/strong><\/p>\n<p>\u4f7f\u7528commons-dbutils\u6846\u67b6\u65f6\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u4e00\u4e2a\u6cdb\u578b\u95ee\u9898\u3002\u4ee5\u4e0b\u4e24\u79cd\u4ee3\u7801\u65b9\u6cd5\u5747\u65e8\u5728\u4ece\u6570\u636e\u5e93\u67e5\u8be2\u5355\u4e2a\u5b9e\u4f53\uff1a<\/p>\n<pre>public &lt;t&gt; t queryone(class&lt;t&gt; t, string sql, object... params) { ... }\n\npublic &lt;t&gt; t queryone(t t, string sql, object... params) { ... }<\/pre>\n<p>\u5728\u65b9\u6cd5\u4e8c\u4e2d\uff0cintellij idea\u4f1a\u663e\u793a\u4ee5\u4e0b\u8b66\u544a\uff1a<\/p>\n<pre>unchecked cast: 'java.lang.class&lt;capture&lt;? extends java.lang.object&gt;&gt;' to 'java.lang.class&lt;? extends t&gt;'<\/pre>\n<p>\u8fd9\u4e2a\u8b66\u544a\u662f\u7531\u4e8ejava\u7684\u6cdb\u578b\u64e6\u9664\u673a\u5236\u9020\u6210\u7684\u3002\u5728\u8fd0\u884c\u65f6\uff0c\u6cdb\u578b\u4fe1\u606f\u4f1a\u88ab\u64e6\u9664\uff0c\u53ea\u5269\u4e0b\u539f\u59cb\u7c7b\u578b\u6216\u8fb9\u754c\u7c7b\u578b\u3002\u56e0\u6b64\uff0c\u65b9\u6cd5\u4e8c\u5728\u64e6\u9664\u540e\u53d8\u4e3a\uff1a<\/p>\n<pre>public Object queryOne(Object t, String sql, Object... params) { ... }<\/pre>\n<p>\u65b9\u6cd5\u4e8c\u65e0\u6cd5\u5728\u8fd0\u884c\u65f6\u83b7\u53d6\u6cdb\u578b\u7684\u5177\u4f53\u7c7b\u578b\uff0c\u56e0\u6b64\u9700\u8981\u8fdb\u884c\u5f3a\u5236\u8f6c\u6362\u4ee5\u5c06\u53c2\u6570\u7c7b\u578b\u8f6c\u6362\u4e3aclass&lt;? extends t&gt;\u3002\u8fd9\u79cd\u5f3a\u5236\u8f6c\u6362\u53ef\u80fd\u4f1a\u5bfc\u81f4\u7c7b\u578b\u5b89\u5168\u95ee\u9898\uff0c\u56e0\u4e3a\u5b83\u4e0d\u80fd\u4fdd\u8bc1\u4f20\u5165\u7684\u53c2\u6570\u7c7b\u578b\u4e0e\u5b9e\u9645\u7c7b\u578b\u5339\u914d\u3002<\/p>\n<p>\u5982\u679c\u4f60\u786e\u5b9a\u4f20\u5165\u7684\u53c2\u6570\u7c7b\u578b\u59cb\u7ec8\u6b63\u786e\uff0c\u53ef\u4ee5\u5728\u65b9\u6cd5\u4e2d\u4f7f\u7528@suppresswarnings(&#8220;unchecked&#8221;)\u6ce8\u89e3\u6765\u6d88\u9664\u8b66\u544a\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u300aCommons-Dbutils\u6cdb\u578b\u65b9\u6cd5\uff1a\u65b9\u6cd5\u4e00\u548c\u65b9\u6cd5\u4e8c\u6709\u4f55\u533a\u522b\u53ca\u6f5c\u5728\u98ce\u9669\uff1f\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8e\u7684\u8d44\u6599\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Commons-Dbutils\u6cdb&#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":[4925],"tags":[],"class_list":["post-203913","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203913","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=203913"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203913\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203913"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203913"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203913"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}