一、Mybaits的简单使用
1、导入jar包
commons-logging-1.1.1.jar，mybatis-3.1.1.jar
2、Mybaits的配置文件（名字可以随意，这边去conf.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>
<!-- 导入外部文件 -->
<properties resource="db.properties"></properties>
<!-- 配置类的别名 -->
<typeAliases>
<!-- <typeAlias type="zhuojing.mybaits.helloword.bean.User" alias="_user"/> -->
<package name="zhuojing.mybaits.helloword.bean"/>
</typeAliases>
<!--
development : 开发模式
work : 工作模式
-->
<plugins>
<plugin interceptor="zhuojing.mybaits.intercept.pageInterceptor"></plugin>
</plugins>
<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="zhuojing/mybaits/helloword/bean/userMapper.xml"/>
</mappers>
</configuration>
注：这边设置了类的别名使用 typeAliases 节点来配置
a：typeAlias 子节点：type 属性为类的全类名，alias 属性别名的值，使用时只需调用别名即可，不用写全类名（映射文件中应用）
b：package：name 属性指定某个包的路径，使用时配置的包只需写类名，不需要写全类名（映射文件中应用）
3、映射文件（userMapper.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="zhuojing.mybaits.helloword.bean.userMapper">
<!--
根据id查询得到一个user对象
-->
<select id="getUser" parameterType="int" resultType="User">
select * from user where id=#{id}
</select>
<select id="getUser1" parameterType="int" >
select * from user where id=#{id}
</select>
</mapper>
4、实体User
public class User {
//省去getter和setter
private Integer id;
private String name;
private Integer age;
}5.Mybaits的使用
public class HelloWorldTest {
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
//System.out.print(HelloWorldTest.class.getClassLoader().getResource("conf.xml"));
String path = "conf.xml";
InputStream in = HelloWorldTest.class.getClassLoader().getResourceAsStream(path);
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(in);
SqlSession session = sessionFactory.openSession();
String statement = "zhuojing.mybaits.helloword.bean.userMapper.getUser";
User user = session.selectOne(statement, 1);
System.out.println(user);
}
}二、结合Spring使用
Mybaits结合Spring使用，本质是把数据源，sqlSessionFactory等Mybaits用到的类交给了Spring 的IOC去管理
1、Mybaits的配置文件（可以有可以没有）
<?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>
<!-- 使用列别名替换列名 默认：true -->
<setting name="useColumnLabel" value="true"/>
<!-- 开启驼峰命名转换：Table(creat_time : creatTime) -->
<setting name="mapUnderscoreToCamelCase" value="true"/>
</configuration>
这边配置文件用于设置一个全局属性，比如数据库方言等
2、加入Spring jar包和mybatis-spring-1.2.1.jar
3、实体
public class SMUser {
private int id;
private String name;
private Date birthday;
private double salary;
}4、Dao接口类SmUserMapper
public interface SmUserMapper {
void save(SMUser smUser);
void update(SMUser user);
void delete(int id);
SMUser findById(int id);
List<SMUser> findAll();
void deleteBatch(List<Integer> ids);
void insertBatch(List<SMUser> smUsers);
}
5、mapper映射文件（名字和Dao接口名字相同）smuserMapper.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">
<!--
namespace: 必须是接口的全类名
扫描mapper包下的所有mapper文件和类，要求mapper配置文件和类名需要一致。
-->
<mapper namespace="zhuojing.mybaits.sm.dao.SmUserMapper">
<!--
id: 必须为接口对应的方法
-->
<insert id="save" parameterType="SMUser">
insert into s_user(user_name,user_birthday, user_salary) values(#{name}, #{birthday},#{salary})
</insert>
<delete id="delete" parameterType="int">
delete from s_user where user_id = #{id}
</delete>
<update id="update" parameterType="SMUser">
update s_user set user_name = #{name}, user_birthday=#{birthday}, user_salary=#{salary} where user_id = #{id}
</update>
<select id="findById" resultType="SMUser" parameterType="int">
select user_id id, user_name name, user_birthday birthday, user_salary salary from s_user where user_id = #{id}
</select>
<select id="findAll" resultType="SMUser">
select user_id id, user_name name, user_birthday birthday, user_salary salary from s_user
</select>
<!-- 批量删除 -->
<!-- foreach 标签的 separator 属性做作用为内容的分隔符-->
<delete id="deleteBatch" parameterType="java.util.List">
delete from s_user where user_id in(
<foreach collection="list" item="item" separator=",">
#{item}
</foreach>
)
</delete>
<insert id="insertBatch" parameterType="java.util.List">
insert into s_user(user_name,user_birthday, user_salary) values
<foreach collection="list" item="item" separator=",">
(#{item.name}, #{item.birthday},#{item.salary})
</foreach>
</insert>
</mapper>
6、Spring配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
<!-- 配置数据源 -->
<bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql://localhost:3306/mybaits"></property>
<property name="username" value="root"></property>
<property name="password" value="密码"></property>
</bean>
<!-- 配置SQLSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="datasource"/>
<property name="typeAliasesPackage" value="zhuojing.mybaits.sm.domain;zhuojing.mybaits.page.bean"/>
<property name="configLocation" value="classpath:config.xml"></property>
</bean>
<!--
3. mybatis自动扫描加载Sql映射文件 : MapperScannerConfigurer
sqlSessionFactory / basePackage
-->
<bean id="config" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="zhuojing.mybaits.sm.dao;zhuojing.mybaits.page.dao"></property>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
<!-- 4. 事务管理 : DataSourceTransactionManager -->
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="datasource"></property>
</bean>
<!-- 5. 使用声明式事务 -->
<tx:annotation-driven transaction-manager="txManager"/>
</beans>7、测试类（这边使用@RunWith(SpringJUnit4ClassRunner.class)和@ContextConfiguration("/applicationContext.xml")注解来加载Spring环境，也可以使用配置web.xml然后启动项目进行测试）
import java.util.Date;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import zhuojing.mybaits.sm.dao.SmUserMapper;
import zhuojing.mybaits.sm.domain.SMUser;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("/applicationContext.xml")
public class SMTest {
@Autowired
private SmUserMapper userMapperDao;
@Test
public void query(){
//SMUser user = new SMUser(-1, "Tom", new Date(), 1000.20);
//userMapperDao.save(user);
System.out.println(userMapperDao.findAll());
}
@Test
public void add(){
SMUser user = new SMUser(-1, "Tom", new Date(), 1000.20);
userMapperDao.save(user);
//System.out.println(userMapperDao.findAll());
}
}