{"id":200231,"date":"2025-05-06T10:20:18","date_gmt":"2025-05-06T02:20:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200231\/"},"modified":"2025-05-06T10:20:18","modified_gmt":"2025-05-06T02:20:18","slug":"%e5%85%b3%e8%81%94%e6%95%b0%e6%8d%ae%e5%ba%93%e8%a1%a8%e6%9f%a5%e8%af%a2%e6%97%b6%ef%bc%8c%e5%a6%82%e4%bd%95%e9%81%bf%e5%85%8dqueryrunner%e8%bf%94%e5%9b%9e%e7%9a%84%e5%86%85%e9%83%a8%e7%b1%bb%e4%b8%ba","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200231\/","title":{"rendered":"\u5173\u8054\u6570\u636e\u5e93\u8868\u67e5\u8be2\u65f6\uff0c\u5982\u4f55\u907f\u514dQueryRunner\u8fd4\u56de\u7684\u5185\u90e8\u7c7b\u4e3anull\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

\u5173\u8054\u6570\u636e\u5e93\u8868\u67e5\u8be2\u65f6\uff0c\u5982\u4f55\u907f\u514dQueryRunner\u8fd4\u56de\u7684\u5185\u90e8\u7c7b\u4e3anull\uff1f <\/h1>\n<\/p>\n

<\/p>\n

\u907f\u514dqueryrunner\u8fd4\u56de\u5185\u90e8\u7c7b\u4e3anull<\/strong><\/p>\n

\u95ee\u9898:<\/strong><\/p>\n

\u5728\u5b58\u5728\u5173\u8054\u5173\u7cfb\u7684\u6570\u636e\u5e93\u8868\u4e2d\uff0c\u5982\u4f55\u5904\u7406queryrunner\u67e5\u8be2\u8fd4\u56de\u7684\u7c7b\u4e2d\u7684\u5185\u90e8\u7c7b\u4e3anull\u7684\u60c5\u51b5\uff1f<\/p>\n

\u89e3\u51b3\u65b9\u6cd5:<\/strong><\/p>\n

\u4f7f\u7528mybatis\u5173\u8054\u6620\u5c04<\/strong><\/p>\n

mybatis\u63d0\u4f9b\u4e86\u81ea\u52a8\u5c06\u6570\u636e\u5e93\u8868\u7684\u5173\u8054\u5173\u7cfb\u6620\u5c04\u5230java\u5bf9\u8c61\u4e2d\uff0c\u4ece\u800c\u907f\u514d\u624b\u52a8\u89e3\u6790\u548c\u5904\u7406\u5185\u90e8\u7c7b\u3002association\u6807\u7b7e\u53ef\u7528\u4e8e\u5b9a\u4e49\u7c7b\u4e0e\u7c7b\u4e4b\u95f4\u7684\u5173\u8054\u3002\u5177\u4f53\u7528\u6cd5\u5982\u4e0b\uff1a<\/p>\n

\u5728customer\u7c7b\u4e2d\u6dfb\u52a0region\u5173\u8054\uff1a<\/p>\n

public class customer {\n    private integer id;\n    private string name;\n    private region region; \/\/ region\u4e3a\u5185\u90e8\u7c7b\n}\n<\/pre>\n
\u5728region\u7c7b\u4e2d\u5b9a\u4e49\u5bf9\u5e94\u6570\u636e\u5e93\u8868\u5b57\u6bb5\u7684\u5c5e\u6027\uff1a<\/p>\n
public class region {\n    private integer id;\n    private string regionname;\n}<\/pre>\n
\u5728mybatis\u6620\u5c04\u6587\u4ef6\u4e2d\u914d\u7f6eassociation\uff1a<\/p>\n
<resultMap id=\"customerResultMap\" type=\"Customer\">\n    <id column=\"id\" property=\"id\"\/>\n    <result column=\"name\" property=\"name\"\/>\n    <association property=\"region\" column=\"region_id\" javaType=\"Region\">\n        <id column=\"region_id\" property=\"id\"\/>\n        <result column=\"region_name\" property=\"regionName\"\/>\n    <\/association>\n<\/resultMap><\/pre>\n
\u901a\u8fc7mybatis\u7ed1\u5b9asql\u548c\u6620\u5c04\u6587\u4ef6\uff0c\u5373\u53ef\u5c06\u6570\u636e\u5e93\u67e5\u8be2\u7ed3\u679c\u81ea\u52a8\u6620\u5c04\u5230customer\u5bf9\u8c61\u4e2d\uff0c\u5176\u4e2dregion\u5c5e\u6027\u5c06\u4e0d\u4f1a\u4e3anull\u3002<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300a\u5173\u8054\u6570\u636e\u5e93\u8868\u67e5\u8be2\u65f6\uff0c\u5982\u4f55\u907f\u514dQueryRunner\u8fd4\u56de\u7684\u5185\u90e8\u7c7b\u4e3anull\uff1f \u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n
\n
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\u5173\u8054\u6570\u636e\u5e93\u8868\u67e5\u8be2\u65f6\uff0c\u5982\u4f55\u907f\u514dQu...<\/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-200231","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200231","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=200231"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200231\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200231"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200231"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}