MyBatis 配置类详解

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>