{"id":207503,"date":"2020-12-26T10:22:30","date_gmt":"2020-12-26T02:22:30","guid":{"rendered":"https:\/\/lrxjmw.cn\/?p=207503"},"modified":"2020-12-21T10:23:25","modified_gmt":"2020-12-21T02:23:25","slug":"mybatis-transmitting-references","status":"publish","type":"post","link":"https:\/\/lrxjmw.cn\/mybatis-transmitting-references.html","title":{"rendered":"MyBatis\u4e2d#{}\u548c${}\u7684\u533a\u522b\u8be6\u89e3"},"content":{"rendered":"<table>\n<tbody>\n<tr>\n<td style=\"padding: 5px 12px; width: 25px; font-size: 22px; text-align: center; background: #E8E8E8; line-height: 30px; color: #999;\">\u5bfc\u8bfb<\/td>\n<td style=\"padding: 10px 10px 12px; line-height: 20px;\"><strong>\u5728\u5b66\u6821\u7684\u65f6\u5019\uff0c\u60f3\u5fc5\u5927\u5bb6\u80af\u5b9a\u542c\u8001\u5e08\u8bb2\u8fc7\uff0c\u5728mybatis\u4e2d\uff0c\u914d\u7f6e\u53c2\u6570\u8981\u7528#\uff0c\u4e0d\u8981\u7528$\u7b26\u53f7\u3002\u56e0\u4e3a$\u4e0d\u5b89\u5168\uff0c\u5bb9\u6613\u88absql\u6ce8\u5165\u3002\u8bb2\u662f\u8fd9\u4e48\u8bb2\uff0c\u4f46\u662f\u5982\u4f55\u6ce8\u5165\u7684\uff0c\u5927\u5bb6\u4e00\u8d77\u6765\u770b\u770b\u5427\u3002<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u533a\u522b<\/strong><\/div>\n<p>1. #\u5c06\u4f20\u5165\u7684\u6570\u636e\u90fd\u5f53\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u4f1a\u5bf9\u81ea\u52a8\u4f20\u5165\u7684\u6570\u636e\u52a0\u4e00\u4e2a\u53cc\u5f15\u53f7\u3002\u5982\uff1aorder by #user_id#\uff0c\u5982\u679c\u4f20\u5165\u7684\u503c\u662f111,\u90a3\u4e48\u89e3\u6790\u6210sql\u65f6\u7684\u503c\u4e3aorder by \"111\", \u5982\u679c\u4f20\u5165\u7684\u503c\u662fid\uff0c\u5219\u89e3\u6790\u6210\u7684sql\u4e3aorder by \"id\".<\/p>\n<p>2. \u5c06\u4f20\u5165\u7684\u6570\u636e\u76f4\u63a5\u663e\u793a\u751f\u6210\u5728sql\u4e2d\u3002\u5982\uff1aorderby\u5c06\u4f20\u5165\u7684\u6570\u636e\u76f4\u63a5\u663e\u793a\u751f\u6210\u5728sql\u4e2d\u3002\u5982\uff1aorderbyuser_id$\uff0c\u5982\u679c\u4f20\u5165\u7684\u503c\u662f111,\u90a3\u4e48\u89e3\u6790\u6210sql\u65f6\u7684\u503c\u4e3aorder by user_id, \u5982\u679c\u4f20\u5165\u7684\u503c\u662fid\uff0c\u5219\u89e3\u6790\u6210\u7684sql\u4e3aorder by id.<\/p>\n<p>3. #\u65b9\u5f0f\u80fd\u591f\u5f88\u5927\u7a0b\u5ea6\u9632\u6b62sql\u6ce8\u5165\u3002<\/p>\n<p>4. $\u65b9\u5f0f\u65e0\u6cd5\u9632\u6b62Sql\u6ce8\u5165\u3002<\/p>\n<p>5. $\u65b9\u5f0f\u4e00\u822c\u7528\u4e8e\u4f20\u5165\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u4f8b\u5982\u4f20\u5165\u8868\u540d.<br \/>\n6. \u4e00\u822c\u80fd\u7528#\u7684\u5c31\u522b\u7528$.<\/p>\n<p>MyBatis\u6392\u5e8f\u65f6\u4f7f\u7528order by \u52a8\u6001\u53c2\u6570\u65f6\u9700\u8981\u6ce8\u610f\uff0c\u7528$\u800c\u4e0d\u662f#<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u5b9e\u4f8b\u8bb2\u89e3\uff1a<\/strong><\/div>\n<p>\u52a8\u6001 sql \u662f mybatis \u7684\u4e3b\u8981\u7279\u6027\u4e4b\u4e00\uff0c\u5728 mapper \u4e2d\u5b9a\u4e49\u7684\u53c2\u6570\u4f20\u5230 xml \u4e2d\u4e4b\u540e\uff0c\u5728\u67e5\u8be2\u4e4b\u524d mybatis \u4f1a\u5bf9\u5176\u8fdb\u884c\u52a8\u6001\u89e3\u6790\u3002mybatis \u4e3a\u6211\u4eec\u63d0\u4f9b\u4e86\u4e24\u79cd\u652f\u6301\u52a8\u6001 sql \u7684\u8bed\u6cd5\uff1a#{} \u4ee5\u53ca ${}\u3002<\/p>\n<p>\u5728\u4e0b\u9762\u7684\u8bed\u53e5\u4e2d\uff0c\u5982\u679c name \u7684\u503c\u4e3a zhangsan\uff0c\u5219\u4e24\u79cd\u65b9\u5f0f\u65e0\u4efb\u4f55\u533a\u522b\uff1a<\/p>\n<pre>\r\nselect * from user where name = #{name};\r\nselect * from user where name = ${name};\r\n<\/pre>\n<p>\u5176\u89e3\u6790\u4e4b\u540e\u7684\u7ed3\u679c\u5747\u4e3a<\/p>\n<pre>\r\nselect * from user where name = 'zhangsan';\r\n<\/pre>\n<p>\u4f46\u662f #{} \u548c ${} \u5728\u9884\u7f16\u8bd1\u4e2d\u7684\u5904\u7406\u662f\u4e0d\u4e00\u6837\u7684\u3002#{} \u5728\u9884\u5904\u7406\u65f6\uff0c\u4f1a\u628a\u53c2\u6570\u90e8\u5206\u7528\u4e00\u4e2a\u5360\u4f4d\u7b26 ? \u4ee3\u66ff\uff0c\u53d8\u6210\u5982\u4e0b\u7684 sql \u8bed\u53e5\uff1a<\/p>\n<pre>\r\nselect * from user where name = ?;<\/pre>\n<p>\u800c ${} \u5219\u53ea\u662f\u7b80\u5355\u7684\u5b57\u7b26\u4e32\u66ff\u6362\uff0c\u5728\u52a8\u6001\u89e3\u6790\u9636\u6bb5\uff0c\u8be5 sql \u8bed\u53e5\u4f1a\u88ab\u89e3\u6790\u6210<\/p>\n<pre>\r\nselect * from user where name = 'zhangsan';<\/pre>\n<p>\u4ee5\u4e0a\uff0c#{} \u7684\u53c2\u6570\u66ff\u6362\u662f\u53d1\u751f\u5728 DBMS \u4e2d\uff0c\u800c ${} \u5219\u53d1\u751f\u5728\u52a8\u6001\u89e3\u6790\u8fc7\u7a0b\u4e2d\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u90a3\u4e48\uff0c\u5728\u4f7f\u7528\u8fc7\u7a0b\u4e2d\u6211\u4eec\u5e94\u8be5\u4f7f\u7528\u54ea\u79cd\u65b9\u5f0f\u5462\uff1f<\/strong><\/div>\n<p>\u7b54\u6848\u662f\uff1a\u4f18\u5148\u4f7f\u7528 #{}\u3002\u56e0\u4e3a ${} \u4f1a\u5bfc\u81f4 sql \u6ce8\u5165\u7684\u95ee\u9898\u3002<\/p>\n<p>\u770b\u4e0b\u9762\u7684\u4f8b\u5b50\uff1a<\/p>\n<pre>\r\nselect * from ${tableName} where name = #{name}\r\n <\/pre>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5982\u679c\u8868\u540d\u4e3a<\/p>\n<pre>\r\nuser; delete user; --\r\n <\/pre>\n<p>\u5219\u52a8\u6001\u89e3\u6790\u4e4b\u540e sql \u5982\u4e0b\uff1a<\/p>\n<pre>\r\nselect * from user; delete user; -- where name = ?;\r\n <\/pre>\n<p>--\u4e4b\u540e\u7684\u8bed\u53e5\u88ab\u6ce8\u91ca\u6389\uff0c\u800c\u539f\u672c\u67e5\u8be2\u7528\u6237\u7684\u8bed\u53e5\u53d8\u6210\u4e86\u67e5\u8be2\u6240\u6709\u7528\u6237\u4fe1\u606f+\u5220\u9664\u7528\u6237\u8868\u7684\u8bed\u53e5\uff0c\u4f1a\u5bf9\u6570\u636e\u5e93\u9020\u6210\u91cd\u5927\u635f\u4f24\uff0c\u6781\u5927\u53ef\u80fd\u5bfc\u81f4\u670d\u52a1\u5668\u5b95\u673a\u3002<\/p>\n<p>\u4f46\u662f\u8868\u540d\u7528\u53c2\u6570\u4f20\u9012\u8fdb\u6765\u7684\u65f6\u5019\uff0c\u53ea\u80fd\u4f7f\u7528 ${} \u3002\u8fd9\u4e5f\u63d0\u9192\u6211\u4eec\u5728\u8fd9\u79cd\u7528\u6cd5\u4e2d\u8981\u5c0f\u5fc3sql\u6ce8\u5165\u7684\u95ee\u9898\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. #\u5c06\u4f20\u5165\u7684\u6570\u636e\u90fd\u5f53\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u4f1a\u5bf9\u81ea\u52a8\u4f20\u5165\u7684\u6570\u636e\u52a0\u4e00\u4e2a\u53cc\u5f15\u53f7\u3002\u5982\uff1aorder by #user_id# [&hellip;]<\/p>\n","protected":false},"author":1903,"featured_media":207504,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[55],"tags":[],"class_list":["post-207503","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-thread"],"acf":[],"_links":{"self":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/207503","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/users\/1903"}],"replies":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/comments?post=207503"}],"version-history":[{"count":1,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/207503\/revisions"}],"predecessor-version":[{"id":207505,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/207503\/revisions\/207505"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media\/207504"}],"wp:attachment":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media?parent=207503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/categories?post=207503"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/tags?post=207503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}