{"id":6932,"date":"2024-11-14T08:42:25","date_gmt":"2024-11-14T00:42:25","guid":{"rendered":"https:\/\/fwq.ai\/blog\/6932\/"},"modified":"2024-11-14T08:42:25","modified_gmt":"2024-11-14T00:42:25","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:\/\/fwq.ai\/blog\/6932\/","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":"

\"\u5173\u8054\u6570\u636e\u5e93\u8868\u67e5\u8be2\u65f6\uff0c\u5982\u4f55\u907f\u514dQueryRunner\u8fd4\u56de\u7684\u5185\u90e8\u7c7b\u4e3anull\uff1f\u63d2\u56fe\"<\/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
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\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
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\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
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\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
\u4ee5\u4e0a\u5c31\u662f\u5173\u8054\u6570\u636e\u5e93\u8868\u67e5\u8be2\u65f6\uff0c\u5982\u4f55\u907f\u514dQueryRunner\u8fd4\u56de\u7684\u5185\u90e8\u7c7b\u4e3anull\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u907f\u514dqueryrunner\u8fd4\u56de\u5185\u90e8\u7c7b\u4e3anull \u95ee\u9898: \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 \u89e3\u51b3\u65b9\u6cd5: \u4f7f\u7528mybatis\u5173\u8054\u6620\u5c04 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 \u5728customer\u7c7b\u4e2d\u6dfb\u52a0region\u5173\u8054\uff1a public class customer { private integer id; private string name; private region region; \/\/ region\u4e3a\u5185\u90e8\u7c7b } \u767b\u5f55\u540e\u590d\u5236 \u5728region\u7c7b\u4e2d\u5b9a\u4e49\u5bf9\u5e94\u6570\u636e\u5e93\u8868\u5b57\u6bb5\u7684\u5c5e\u6027\uff1a public class region { private integer id; private string regionname; } \u767b\u5f55\u540e\u590d\u5236 \u5728mybatis\u6620\u5c04\u6587\u4ef6\u4e2d\u914d\u7f6eassociation\uff1a <resultMap id=”customerResultMap” type=”Customer”> <id column=”id” property=”id”\/> <result column=”name” property=”name”\/> <association property=”region” column=”region_id” javaType=”Region”> <id column=”region_id” property=”id”\/> <result […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-6932","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6932","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=6932"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6932\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=6932"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=6932"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=6932"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}