核心配置文件中的标签必须按照固定的顺序：
properties?,settings?,typeAliases?,typeHandlers?,objectFactory?,objectWrapperFactory?,
reflectorFactory?,plugins?,environments?,databaseIdProvider?,mappers?
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"> <configuration> <properties resource="jdbc.properties">properties> <settings> <setting name="mapUnderscoreToCamelCase" value="true"/> <setting name="lazyLoadingEnabled" value="true"/> settings> <typeAliases> <package name="com.lianyou.mybatis.bean"/> typeAliases> <environments default="mysql_test"> <environment id="mysql_test"> <transactionManager type="JDBC"/> <dataSource type="POOLED"> <property name="driver" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> dataSource> environment> environments> <mappers> <mapper resource="UserMapper.xml"/> <package name="com.lianyou.mybatis.mapper"/> mappers> configuration>
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Original: https://www.cnblogs.com/wuzkkk/p/15941412.html
Author: 在厂的上进者
Title: MyBatis 配置类详解
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