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<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"><!--上面两行是核心配置文件的约束头--><configuration> <!--加载外部propert

核心配置文件（sqlMapperConfig.xml）的约束<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">映射配置文件（xxx.xml）的约束<?xml version="1.0"