1、在Maven的resources包文件夹下新建mybatis-config.xml,带数据库配置
<?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>
<!--在控制台显示SQL语句-->
<setting name="logImpl" value="STDOUT_LOGGING"/>
<!--开启全局驼峰命名映射-->
<!-- <setting name="mapUnderscoreToCamelCase" value="true"/>-->
</settings>
<!--
typeAliases给类名起别名
typeAlias 给单个类配置别名,太麻烦了,每一个新增的类都得配置,不方便
type:原本的包名+类名
alias:起的别名
-->
<typeAliases>
<!-- <typeAlias type="com.itheima.pojo.User" alias="User"/>-->
<!-- <typeAlias type="com.itheima.pojo.Emp" alias="Emp"/>-->
<package name="com.wsh.pojo"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<!--配置连接池需要的参数-->
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://192.144.23:3306/javatest?useSSL=false"/>
<property name="username" value="root"/>
<property name="password" value="wsh92"/>
</dataSource>
</environment>
</environments>
<mappers>
<!-- <mapper resource="UserMapper.xml"/>-->
<!-- <mapper resource="EmpMapper.xml"/>-->
<package name="com.wsh.mapper"/>
</mappers>
</configuration>2、在Maven的resources包文件夹下新建和上面mapper一致的文件夹路径,编写UserMapper.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.wsh.mapper.UserMapper">
<select id="getAll" resultType="com.wsh.pojo.User">
select * from user
</select>
<select id="getUser" resultType="com.wsh.pojo.User">
select * from user where id = #{id}
</select>
</mapper>#{变量名}:先使用?占位,后续将具体值赋给?
${变量名}:字符串拼接的形式,会存在 SQL 注入问题,尤其开起了 waf 防御的网站,会判定为病毒攻击从而拦截。

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