Mybatis入门

pom.xml

<packaging>jar</packaging><dependencies>    <dependency>        <groupId>org.mybatis</groupId>        <artifactId>mybatis</artifactId>        <version>3.4.5</version>    </dependency>    <dependency>        <groupId>mysql</groupId>        <artifactId>mysql-connector-java</artifactId>        <version>5.1.6</version>    </dependency>    <dependency>        <groupId>log4j</groupId>        <artifactId>log4j</artifactId>        <version>1.2.12</version>    </dependency>    <dependency>        <groupId>junit</groupId>        <artifactId>junit</artifactId>        <version>4.1</version>    </dependency></dependencies>

SqlMapConfig.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>    <environments default="mysql">        <environment id="mysql">            <transactionManager type="JDBC"></transactionManager>            <dataSource type="POOLED">                <property name="driver" value="com.mysql.jdbc.Driver"/>                <property name="url" value="jdbc:mysql:///eesy"/>                <property name="username" value="root"/>                <property name="password" value="root"/>            </dataSource>        </environment>    </environments>    <mappers>        <mapper resource="com/company/dao/IAcountMapper.xml"></mapper>    </mappers></configuration>IAcountMapper.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="com.company.dao.IAccountMapper">    <select id="findAll" resultType="com.company.domain.Account">        SELECT * FROM account    </select></mapper>

MyBatisTest.java

public static void main(String[] args) throws Exception {    //1.读取配置文件    InputStream in= Resources.getResourceAsStream("SqlMapConfig.xml");    //2.创建SqlSessionFactory工厂(构建者模式：隐藏对象的创建细节，使用者只需调用方法即可拿到对象)    SqlSessionFactoryBuilder builder=new SqlSessionFactoryBuilder();    SqlSessionFactory factory=builder.build(in);    //3.使用工厂对象获取SqlSession对象（工厂模式：创建对象的最佳方式，使用一个共同的接口来指向新创建的对象）    SqlSession session = factory.openSession();    //4.使用SqlSession对象创建Dao接口的代理对象（动态代理模式：不修改原有代码的情况下对已有方法进行增强）    IAccountMapper mapper = session.getMapper(IAccountMapper.class);    //5.使用代理对象执行方法    List<Account> all = mapper.findAll();    System.out.println(all);    //6.释放资源    session.close();    in.close();}