{"id":66427,"date":"2024-10-14T17:26:15","date_gmt":"2024-10-14T09:26:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/66427\/"},"modified":"2024-10-14T17:26:16","modified_gmt":"2024-10-14T09:26:16","slug":"mybatis%e7%9a%84%e5%bb%b6%e9%81%b2%e5%8a%a0%e8%bc%89%ef%bc%8c%e4%bd%a0%e7%9f%a5%e9%81%93%e6%98%af%e6%80%8e%e9%ba%bc%e5%af%a6%e7%8f%be%e7%9a%84%e5%97%8e%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/66427\/","title":{"rendered":"MyBatis\u7684\u5ef6\u9072\u52a0\u8f09\uff0c\u4f60\u77e5\u9053\u662f\u600e\u9ebc\u5be6\u73fe\u7684\u55ce\uff1f"},"content":{"rendered":"<h1 id=\"mybatis%e7%9a%84%e5%bb%b6%e9%81%b2%e5%8a%a0%e8%bc%89%ef%bc%8c%e4%bd%a0%e7%9f%a5%e9%81%93%e6%98%af%e6%80%8e%e9%ba%bc%e5%af%a6%e7%8f%be%e7%9a%84%e5%97%8e%ef%bc%9f-GerXBCXzks\">MyBatis\u7684\u5ef6\u9072\u52a0\u8f09\uff0c\u4f60\u77e5\u9053\u662f\u600e\u9ebc\u5be6\u73fe\u7684\u55ce\uff1f<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u8edf\u9ad4\u958b\u767c\u4e2d\uff0c\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002MyBatis\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u6301\u4e45\u5c64\u6846\u67b6\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u512a\u5316\u6578\u64da\u5eab\u4ea4\u4e92\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u5ef6\u9072\u52a0\u8f09\uff08Lazy Loading\uff09\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMyBatis\u7684\u5ef6\u9072\u52a0\u8f09\u662f\u5982\u4f55\u5be6\u73fe\u7684\uff0c\u4ee5\u53ca\u5b83\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u512a\u52e2\u548c\u6ce8\u610f\u4e8b\u9805\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%bb%b6%e9%81%b2%e5%8a%a0%e8%bc%89%ef%bc%9f-GerXBCXzks\">\u4ec0\u9ebc\u662f\u5ef6\u9072\u52a0\u8f09\uff1f<\/h2>\n<p>\u5ef6\u9072\u52a0\u8f09\u662f\u4e00\u7a2e\u8a2d\u8a08\u6a21\u5f0f\uff0c\u65e8\u5728\u63d0\u9ad8\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u3002\u5b83\u7684\u57fa\u672c\u539f\u5247\u662f\uff1a\u5728\u9700\u8981\u4f7f\u7528\u67d0\u500b\u5c0d\u8c61\u6642\u624d\u53bb\u52a0\u8f09\u5b83\uff0c\u800c\u4e0d\u662f\u5728\u5c0d\u8c61\u88ab\u5275\u5efa\u6642\u5c31\u7acb\u5373\u52a0\u8f09\u3002\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u5eab\u67e5\u8a62\uff0c\u5f9e\u800c\u63d0\u9ad8\u61c9\u7528\u7684\u97ff\u61c9\u901f\u5ea6\u3002<\/p>\n<h2 id=\"mybatis%e4%b8%ad%e7%9a%84%e5%bb%b6%e9%81%b2%e5%8a%a0%e8%bc%89%e5%af%a6%e7%8f%be-GerXBCXzks\">MyBatis\u4e2d\u7684\u5ef6\u9072\u52a0\u8f09\u5be6\u73fe<\/h2>\n<p>\u5728MyBatis\u4e2d\uff0c\u5ef6\u9072\u52a0\u8f09\u7684\u5be6\u73fe\u4e3b\u8981\u4f9d\u8cf4\u65bc\u914d\u7f6e\u6587\u4ef6\u4e2d\u7684\u8a2d\u7f6e\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u95dc\u9375\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e9%85%8d%e7%bd%ae%e5%bb%b6%e9%81%b2%e5%8a%a0%e8%bc%89-GerXBCXzks\">1. \u914d\u7f6e\u5ef6\u9072\u52a0\u8f09<\/h3>\n<p>\u5728MyBatis\u7684\u6620\u5c04\u6587\u4ef6\u4e2d\uff0c\u53ef\u4ee5\u901a\u904e\u8a2d\u7f6e`lazyLoadingEnabled`\u5c6c\u6027\u4f86\u555f\u7528\u5ef6\u9072\u52a0\u8f09\u3002\u9019\u500b\u5c6c\u6027\u901a\u5e38\u5728&#8220;\u6a19\u7c64\u4e2d\u9032\u884c\u914d\u7f6e\uff1a<\/p>\n<pre><code>&lt;settings&gt;\n    &lt;setting name=\"lazyLoadingEnabled\" value=\"true\"\/&gt;\n&lt;\/settings&gt;<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8one%e5%92%8cmany%e8%a8%bb%e8%a7%a3-GerXBCXzks\">2. \u4f7f\u7528`@One`\u548c`@Many`\u8a3b\u89e3<\/h3>\n<p>\u5728Java\u5c0d\u8c61\u4e2d\uff0c\u7576\u9700\u8981\u9032\u884c\u4e00\u5c0d\u4e00\u6216\u4e00\u5c0d\u591a\u7684\u95dc\u806f\u67e5\u8a62\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528`@One`\u548c`@Many`\u8a3b\u89e3\u4f86\u6a19\u8a18\u9019\u4e9b\u95dc\u806f\u3002\u9019\u4e9b\u8a3b\u89e3\u6703\u544a\u8a34MyBatis\u5728\u9700\u8981\u6642\u624d\u53bb\u67e5\u8a62\u76f8\u95dc\u7684\u6578\u64da\u3002<\/p>\n<pre><code>public class User {\n    private Integer id;\n    private String name;\n\n    @One\n    private Profile profile; \/\/ \u5ef6\u9072\u52a0\u8f09\n}\n<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8select%e8%aa%9e%e5%8f%a5-GerXBCXzks\">3. \u4f7f\u7528`select`\u8a9e\u53e5<\/h3>\n<p>\u5728\u67e5\u8a62\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528`select`\u8a9e\u53e5\u4f86\u7372\u53d6\u4e3b\u5c0d\u8c61\uff0c\u800c\u76f8\u95dc\u5c0d\u8c61\u5247\u5728\u7b2c\u4e00\u6b21\u8a2a\u554f\u6642\u9032\u884c\u67e5\u8a62\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>&lt;select id=\"getUser\" resultType=\"User\"&gt;\n    SELECT * FROM users WHERE id = #{id}\n&lt;\/select&gt;<\/code><\/pre>\n<h2 id=\"%e5%bb%b6%e9%81%b2%e5%8a%a0%e8%bc%89%e7%9a%84%e5%84%aa%e5%8b%a2-GerXBCXzks\">\u5ef6\u9072\u52a0\u8f09\u7684\u512a\u52e2<\/h2>\n<ul>\n<li><strong>\u6027\u80fd\u512a\u5316\uff1a<\/strong>\u6e1b\u5c11\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u5eab\u67e5\u8a62\uff0c\u964d\u4f4e\u7cfb\u7d71\u8ca0\u64d4\u3002<\/li>\n<li><strong>\u8cc7\u6e90\u7bc0\u7701\uff1a<\/strong>\u50c5\u5728\u9700\u8981\u6642\u52a0\u8f09\u6578\u64da\uff0c\u7bc0\u7701\u5167\u5b58\u548c\u8655\u7406\u5668\u8cc7\u6e90\u3002<\/li>\n<li><strong>\u63d0\u9ad8\u97ff\u61c9\u901f\u5ea6\uff1a<\/strong>\u7528\u6236\u5728\u8a2a\u554f\u4e3b\u5c0d\u8c61\u6642\uff0c\u80fd\u5920\u66f4\u5feb\u5730\u7372\u5f97\u97ff\u61c9\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-GerXBCXzks\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136\u5ef6\u9072\u52a0\u8f09\u6709\u8a31\u591a\u512a\u52e2\uff0c\u4f46\u5728\u4f7f\u7528\u6642\u4e5f\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li><strong>\u67e5\u8a62\u6027\u80fd\uff1a<\/strong>\u5982\u679c\u5ef6\u9072\u52a0\u8f09\u7684\u5c0d\u8c61\u904e\u591a\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u591a\u6b21\u67e5\u8a62\uff0c\u5f71\u97ff\u6027\u80fd\u3002<\/li>\n<li><strong>\u4e8b\u52d9\u7ba1\u7406\uff1a<\/strong>\u5728\u4f7f\u7528\u5ef6\u9072\u52a0\u8f09\u6642\uff0c\u9700\u78ba\u4fdd\u4e8b\u52d9\u7684\u6b63\u78ba\u6027\uff0c\u907f\u514d\u51fa\u73fe\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u60c5\u6cc1\u3002<\/li>\n<li><strong>\u5e8f\u5217\u5316\u554f\u984c\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u5ef6\u9072\u52a0\u8f09\u7684\u5c0d\u8c61\u53ef\u80fd\u7121\u6cd5\u6b63\u78ba\u5e8f\u5217\u5316\uff0c\u9700\u8b39\u614e\u8655\u7406\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-GerXBCXzks\">\u7e3d\u7d50<\/h2>\n<p>MyBatis\u7684\u5ef6\u9072\u52a0\u8f09\u529f\u80fd\u70ba\u958b\u767c\u8005\u63d0\u4f9b\u4e86\u4e00\u7a2e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u64cd\u4f5c\u65b9\u5f0f\uff0c\u80fd\u5920\u5728\u63d0\u9ad8\u6027\u80fd\u7684\u540c\u6642\u6e1b\u5c11\u8cc7\u6e90\u6d88\u8017\u3002\u7136\u800c\uff0c\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u958b\u767c\u8005\u9700\u8981\u6839\u64da\u5177\u9ad4\u60c5\u6cc1\u8b39\u614e\u4f7f\u7528\uff0c\u4ee5\u907f\u514d\u6f5b\u5728\u7684\u6027\u80fd\u554f\u984c\u548c\u6578\u64da\u4e0d\u4e00\u81f4\u6027\u3002\u82e5\u60a8\u5c0d\u65bc\u4f3a\u670d\u5668\u7684\u9078\u64c7\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u4e86\u89e3\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u89e3\u6c7a\u65b9\u6848\uff0c\u70ba\u60a8\u7684\u61c9\u7528\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MyBatis\u7684\u5ef6\u9072\u52a0\u8f09\u6280\u8853\uff0c\u4e86\u89e3\u5176\u5be6\u73fe\u539f\u7406\u53ca\u512a\u52e2\uff0c\u63d0\u5347\u6578\u64da\u8a2a\u554f\u6548\u7387\uff0c\u512a\u5316\u61c9\u7528\u6027\u80fd\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-66427","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66427","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=66427"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66427\/revisions"}],"predecessor-version":[{"id":66428,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66427\/revisions\/66428"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=66427"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=66427"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=66427"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}