轉載自http://blog.csdn.net/huzheaccp/article/details/7399124
所需要jar包:mybatis-3.x.x.jar 、如果需要和spring整合,還需要加入相關的包
1:看項目目錄 紅顏色不要關心
2:按照步驟:
1:加入jar包
2:創建數據源(configuration.xml)創建數據庫(此處省略)
- <?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>
- <!--給實體類起一個別名 user -->
- <typeAlias type="com.forum.po.User" alias="User" />
- </typeAliases>
- <!--數據源配置 這塊用 BD2數據庫 -->
- <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裝載進來 同等於把“dao”的實現裝載進來 -->
- <mapper resource="myBatis/userMapper.xml" />
- </mappers>
- </configuration>
- package com.forum.po;
- /**
- * 用戶類
- *
- * @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:創建dao接口、可以說是Mapper接口:UserMapper
- package com.forum.dao;
- import com.forum.po.User;
- public interface UserMapper {
- public User findById(String Id);
- }
5:創建dao的實現,不同於hibernarte的此處的實現爲一個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">
- <!--這塊等於dao接口的實現 namespace必須和接口的類路徑一樣-->
- <mapper namespace="com.forum.dao.UserMapper">
- <!-- findById必須和接口中的方法名一樣 返回一個User 就是剛纔的別名 如果不弄別名要連類路徑一起寫 麻煩-->
- <select id="findById" parameterType="HashMap" resultType="User">
- select
- * from butone.student where id=#{id}
- </select>
- </mapper>
6:測試類,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數據庫連接測試
- *
- * @author db2admin
- *
- */
- public class MyBatisTest {
- /**
- * 獲得MyBatis SqlSessionFactory
- * SqlSessionFactory負責創建SqlSession,一旦創建成功,就可以用SqlSession實例來執行映射語句,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());
- }
- }