mybatis框架入门案例

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今天学习了mybatis的简单的案例，感觉收获很大，写一个很简单的入门程序来快速的说明mybatis的用法

案例的需求

mybatis环境的搭建

1：导入相应的的架包（jar）和导入数据库的文件

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导入相应的的架包（jar）asm-3.3.1.jarcglib-2.2.2.jarcommons-logging-1.1.1.jar javassost-3.17.1-GA.jarjunit-4.9.jarlog4j-1.2.17.jarlog4j-api-2.0-rc1.jarlog4j-core-2.0-rc1.jarmybatis-3.2.7.jarmysql-connector-java-5.1.7-bin.jarslf4j-api-1.7.5.jarslf4j-log4j12-1.7.5.jar数据库表tb_personCREATE TABLE tb_person(   id INT PRIMARY KEY AUTO_INCREMENT,   NAME VARCHAR(18),   sex  VARCHAR(18),   age INT   );INSERT INTO tb_person(NAME,sex,age) VALUES('jack','男',23)  

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2：配置mybatis的配置文件

** mybatis-config.xml**

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration><properties resource="db.properties"></properties><!-- 和spring整合后 environments配置将废除--><environments default="development">    <environment id="development">    <!-- 使用jdbc事务管理-->    <transactionManager type="JDBC" />    <!-- 数据库连接池-->    <dataSource type="POOLED">        <property name="driver" value="${jdbc.driver}" />        <property name="url" value="${jdbc.url}" />        <property name="username" value="${jdbc.username}" />        <property name="password" value="${jdbc.password}" />    </dataSource>    </environment></environments><mappers>    //通过包扫描的形式加载配置文件    <package name="com.mybatis.mapper"/></mappers></configuration>

db.proprities

jdbc.driver=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://localhost:3306/mybatisonetoone?characterEncoding=utf-8jdbc.username=rootjdbc.password=admin

** log4j.properties****

# Global logging configurationlog4j.rootLogger=DEBUG, stdout# Console output...log4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

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pojo类：person类public class Person implements Serializable{private static final long serialVersionUID = 1L;private Integer id; private String name;private String sex;private Integer age;提供共有的getter（）和setter（）方法...........}Person的映射文件PersonMapper.xmlPersonMapper.xml：<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.mybatis.mapper.PersonMapper"><select id="findPersonById" parameterType="java.lang.Integer" resultType="com.mybatis.pojo.Person">    select *from tb_person where id=#{id}</select></mapper>提供一个mapper接口PersonMapper.javaimport com.mybatis.pojo.Person;public interface PersonMapper {    //按照id进行查询数据表，将其结果返回的结构是一个Person对象     public Person findPersonById(Integer id);}   测试类：MyTest.java@Testpublic void testfindPersonById() throws IOException {    String resource = "mybatis-config.xml";    InputStream inputStream = Resources.getResourceAsStream(resource );    SqlSessionFactory factory= new SqlSessionFactoryBuilder().build(inputStream);    SqlSession openSession = factory.openSession();    //获得mapper接口的对象    PersonMapper mapper = openSession.getMapper(PersonMapper.class);    Person person = mapper.findPersonById(1);    System.out.println(person);    openSession.commit();}控制台输出的结果：DEBUG [main] - ==>  Preparing: select *from tb_person where id=? DEBUG [main] - ==> Parameters: 1(Integer)DEBUG [main] - <==      Total: 1Person [id=1, name=jack, sex=男, age=23]

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小结:通过这个简答的mybatis的入门级别的小程序，使我可以迅速的对mybatis的工作原理有一个深入的理解，是我学习mybatis框架开始的第一步，我会继续深入的学习。如果遇到大牛路过，请各位大牛多多指点，本人小白一枚。