MyBatis入门学习（一）

所需要jar包：mybatis-3.x.x.jar 、如果需要和spring整合，还需要加入相关的包

1：看项目目录红颜色不要关心

2：按照步骤：

1：加入jar包

2：创建数据源（configuration.xml）创建数据库（此处省略）

<?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> <typeAliases>  <typeAlias type="com.forum.po.User" alias="User" /> </typeAliases>  <environments default="development"> <environment id="development"> <transactionManager type="jdbc" /> <dataSource type="POOLED"> <property name="driver" value="com.ibm.db2.jcc.DB2Driver" /> <property name="url" value="jdbc:db2://localhost:50000/forum" /> <property name="username" value="DB2ADMIN" /> <property name="password" value="admin" /> </dataSource> </environment> </environments> <mappers>  <mapper resource="myBatis/userMapper.xml" /> </mappers> </configuration> 3：创建实体类USER

package com.forum.po; /** * 用户类 * * @author db2admin * */ public class User extends Entity { private String name; private Integer age; public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public User() { } }
4：创建dao接口、可以说是Mapper接口：UserMapper

package com.forum.dao; import com.forum.po.User; public interface UserMapper { public User findById(String Id); }
5:创建dao的实现，不同于hibernarte的此处的实现为一个xml文件，也就是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="com.forum.dao.UserMapper">  <select id="findById" parameterType="HashMap" resultType="User"> select * from butone.student where id=#{id} </select> </mapper>
6:测试类，MyBatisTest

package com.forum.test; import java.io.IOException; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import com.forum.dao.UserMapper; import com.forum.po.User; /** * myBatis数据库连接测试 * * @author db2admin * */ public class MyBatisTest { /** * 获得MyBatis SqlSessionFactory * SqlSessionFactory负责创建SqlSession，一旦创建成功，就可以用SqlSession实例来执行映射语句，commit，rollback，close等方法。 * @return */ private static SqlSessionFactory getSessionFactory() { SqlSessionFactory sessionFactory = null; String resource = "configuration.xml"; try { sessionFactory = new SqlSessionFactoryBuilder().build(Resources .getResourceAsReader(resource)); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return sessionFactory; } public static void main(String[] args) { SqlSession sqlSession = getSessionFactory().openSession(); UserMapper userMapper = sqlSession.getMapper(UserMapper.class); User user = userMapper.findById("1"); System.out.println(user.getName()); } }

MyBatis入门学习（一）

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