全局配置

<?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>
    <properties >
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </properties>

    <typeAliases>
        <package name="mybatis01.pojo"/>
    </typeAliases>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/java2022"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <!--<mapper resource="org/mybatis/example/BlogMapper.xml"/>-->

        <mapper resource="mapper/tulunMapper.xml"></mapper>
        <mapper resource="mapper/newsMapper.xml"/>
        <!--<mapper class="com.tulun.Mybatis.mapper.userMapper"></mapper>-->
    </mappers>

</configuration>

mapper.xml配件

<?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="mybatis01.mapper.tulunMapper">
<select id="selectByid" parameterType="int" resultType="mybatis01.pojo.tulun">
    select * from tulun where id = #{sid}
</select>
</mapper>