{"id":14340,"date":"2023-12-04T01:44:35","date_gmt":"2023-12-03T17:44:35","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=14340"},"modified":"2023-12-04T12:06:33","modified_gmt":"2023-12-04T04:06:33","slug":"mybatis-zhong-li-mian-de-ming-cheng-dui-ying-de-s","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/04\/mybatis-zhong-li-mian-de-ming-cheng-dui-ying-de-s\/","title":{"rendered":"MyBatis \u4e2d {} \u91cc\u9762\u7684\u540d\u79f0\u5bf9\u5e94\u7684\u662f Map \u91cc\u9762\u7684 key \u540d\u79f0\uff1f"},"content":{"rendered":"<p>\u5728 MyBatis \u4e2d\uff0c<code>#{}<\/code> \u4e2d\u7684\u540d\u79f0\u5e76\u4e0d\u4e00\u5b9a\u5bf9\u5e94\u4e8e Java \u7684 Map \u4e2d\u7684 key \u540d\u79f0\u3002<code>#{}<\/code> \u662f MyBatis \u7684\u53c2\u6570\u5360\u4f4d\u7b26\uff0c\u7528\u4e8e\u52a8\u6001\u5730\u5c06\u53c2\u6570\u503c\u4f20\u9012\u7ed9 SQL \u8bed\u53e5\u3002\u800c\u5b83\u91cc\u9762\u7684\u540d\u79f0\u901a\u5e38\u662f\u7528\u4e8e\u5360\u4f4d\u7b26\u7684\u6807\u8bc6\uff0c\u4e0d\u76f4\u63a5\u5bf9\u5e94\u4e8e Java \u7684 Map \u4e2d\u7684 key \u540d\u79f0\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u8003\u8651\u5982\u4e0b SQL \u67e5\u8be2\uff1a<\/p>\n<pre data-language=XML><code class=\"language-markup  line-numbers\">&lt;select id=\"getUserById\" parameterType=\"java.util.Map\" resultType=\"User\"&gt;\n    SELECT * FROM users WHERE id = #{userId}\n&lt;\/select&gt;\n<\/code><\/pre>\n<p>\u8fd9\u91cc\u7684 <code>#{userId}<\/code> \u662f\u4e00\u4e2a\u53c2\u6570\u5360\u4f4d\u7b26\uff0c<code>userId<\/code> \u5e76\u4e0d\u9700\u8981\u5728 Java \u7684 Map \u4e2d\u4ee5\u76f8\u540c\u7684 key \u540d\u79f0\u5b58\u5728\uff0c\u800c\u662f\u5728\u4f7f\u7528\u8fd9\u4e2a SQL \u8bed\u53e5\u65f6\uff0c\u4f20\u9012\u4e00\u4e2a\u5305\u542b\u4e86 <code>userId<\/code> \u5bf9\u5e94\u503c\u7684 Map \u5bf9\u8c61\u5373\u53ef\u3002<\/p>\n<p>\u5f53\u7136\uff0c\u5982\u679c\u5e0c\u671b\u4f7f\u7528 Map \u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\uff0c\u786e\u4fdd Map \u4e2d\u7684 key \u540d\u79f0\u4e0e SQL \u4e2d <code>#{}<\/code> \u4e2d\u7684\u540d\u79f0\u4fdd\u6301\u4e00\u81f4\u662f\u4e00\u4e2a\u826f\u597d\u7684\u5b9e\u8df5\uff0c\u8fd9\u6837\u53ef\u4ee5\u65b9\u4fbf\u5730\u5728 SQL \u4e2d\u5f15\u7528\u6b63\u786e\u7684\u53c2\u6570\u503c\u3002\u4f46\u8fd9\u5e76\u4e0d\u662f\u5f3a\u5236\u8981\u6c42\uff0c\u53ef\u4ee5\u5728 SQL \u4e2d\u4f7f\u7528\u4efb\u610f\u540d\u79f0\u7684\u53c2\u6570\u5360\u4f4d\u7b26\uff0c\u53ea\u8981\u5728\u4f20\u9012\u53c2\u6570\u65f6\u4fdd\u6301\u5bf9\u5e94\u5173\u7cfb\u5373\u53ef\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 MyBatis \u4e2d\uff0c#{} \u4e2d\u7684\u540d\u79f0\u5e76\u4e0d\u4e00\u5b9a\u5bf9\u5e94\u4e8e Java \u7684 Map \u4e2d\u7684 key \u540d\u79f0\u3002#{} \u662f  [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[113],"tags":[],"class_list":["post-14340","post","type-post","status-publish","format-standard","hentry","category-mybatis"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/14340","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=14340"}],"version-history":[{"count":3,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/14340\/revisions"}],"predecessor-version":[{"id":14471,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/14340\/revisions\/14471"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=14340"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=14340"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=14340"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}