JavaEE——Mybatis（12）--MyBatis与Spring整合--MyBatis相关配置文件

 mybatis-config.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>

    <!--引入外部properties配置文件-->
    <properties resource="conf\dbconfig.properties"></properties>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="studentMapper.xml"/>
    </mappers>
</configuration>

　　

dbconfig.properties

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/db_person
username=root
password=1234

　　

相应的StudentMapper接口

package dao;

import bean.Student;

public interface StudentMapper {

    public Student getById(Integer id);
}

　　

以及StudentMapper.xml

<?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="test.dao.StudentMapper">

    <!--public Student getById(Integer id);-->
    <select id="getById" resultType="bean.Student">
        SELECT * FROM student WHERE id=#{id}
    </select>
</mapper>