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需要jar包:mybatis-3.x.x.jar 、假设需要和spring综合。此外,我们需要增加相关的包
1:看到项目文件夹 不要在意红色
2:依照步骤:
1:增加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> <!--给实体类起一个别名 user --> <typeAlias type="com.forum.po.User" alias="User" /> </typeAliases> <!--数据源配置 这块用 BD2数据库 --> <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> <!--userMapper.xml装载进来 同等于把“dao”的实现装载进来 --> <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() { } }
package com.forum.dao; import com.forum.po.User; public interface UserMapper { public User findById(String Id); }
<?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"> <!--这块等于dao接口的实现 namespace必须和接口的类路径一样--> <mapper namespace="com.forum.dao.UserMapper"> <!-- findById必须和接口中的方法名一样 返回一个User 就是刚才的别名 假设不弄别名要连类路径一起写 麻烦--> <select id="findById" parameterType="HashMap" resultType="User"> select * from butone.student where id=#{id} </select> </mapper>
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数据库连接測试 * * @author db2admin * */ public class MyBatisTest { /** * 获得MyBatis SqlSessionFactory * SqlSessionFactory负责创建SqlSession,一旦创建成功,就能够用SqlSession实例来运行映射语句,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()); } }
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原文地址:http://www.cnblogs.com/mengfanrong/p/4595692.html