mybatisConfig.xml

<?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>
    <settings>
        <!--        设置驼峰转换是否可用，true为可用，new对象的时候让数据库book_price和bookPrice对上-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <!--        STDOUT_LOGGING 标准的输出到控制台-->
        <setting name="logImpl" value="STDOUT_LOGGING"/>
        <!--        设置所有的insert useGeneratedKeys="true"-->
        <!--        <setting name="useGeneratedKeys" value="true"/>-->
    </settings>



</configuration>