mybatis简单应用（基于配置文件）

本文主要介绍了如何使用mybatis进行简单的数据库操作。本人使用的是mybatis3.05。

1.创建数据库表（User表）

CREATE TABLE `NewTable` (`userId`  bigint(20) NOT NULL AUTO_INCREMENT ,`userName`  varchar(30) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL ,`password`  varchar(80) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL ,`comment`  varchar(250) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL ,PRIMARY KEY (`userId`),UNIQUE INDEX `UQ_User_userName` (`userName`) USING BTREE)

2.2. 创建实体类

package com.mybatis.config;public class User {    private int userId;    private String userName;    private String password;    private String comment;    public int getUserId() {        return userId;    }    public void setUserId(int userId) {        this.userId = userId;    }    public String getUserName() {        return userName;    }    public void setUserName(String userName) {        this.userName = userName;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }    public String getComment() {        return comment;    }    public void setComment(String comment) {        this.comment = comment;    }}

3. 定义数据访问接口

package com.mybatis.config;import java.util.List;public interface UserDao {        public int insert(User user);        public int update(User user);        public int delete(String userName);        public List<User> selectAll();        public int countAll();        public User findByUserName(String userName);}

4.创建MyBatis映射文件（UserDaoMapper.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.mybatis.config.UserDao">    <select id="countAll" resultType="int">        select count(*) c from user;    </select>        <select id="selectAll" resultType="com.mybatis.config.User">        select * from user order by userName asc    </select>        <insert id="insert" parameterType="com.mybatis.config.User">        insert into user(userName,password,comment) values(#{userName},#{password},#{comment})    </insert>        <update id="update" parameterType="com.mybatis.config.User">        update user set userName=#{userName},password=#{password},comment=#{comment} where userName=#{userName}    </update>        <delete id="delete" parameterType="int">        delete from user where userName=#{userName}    </delete>        <select id="findByUserName" parameterType="String" resultType="com.mybatis.config.User">        select * from user where userName=#{userName}    </select></mapper>

5. 创建mybatis配置文件

<?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>    <environments default="development">        <environment id="development">            <transactionManager type="JDBC" />            <dataSource type="POOLED">                <property name="driver" value="com.mysql.jdbc.Driver" />                <property name="url" value="jdbc:mysql://localhost:3306/hlp?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull" />                <property name="username" value="root" />                <property name="password" value="1234" />            </dataSource>        </environment>    </environments>    <mappers>        <mapper resource="com/mybatis/config/UserDaoMapper.xml"/>    </mappers></configuration>

6. 编写测试代码

package com.mybatis.config;import java.io.Reader;import java.util.Iterator;import java.util.List;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 org.junit.Test;public class UserDaoTest {    @Test    public void userDaoTest() throws Exception    {        String resource = "MyBatis-Configuration.xml";        Reader reader = Resources.getResourceAsReader(resource);        SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();        SqlSessionFactory factory = builder.build(reader);                SqlSession session = factory.openSession();        UserDao userDao = session.getMapper(UserDao.class);                User user = new User();        user.setUserName("hongye");        user.setPassword("123456");        user.setComment("备注");                userDao.insert(user);        System.out.println("记录条数："+userDao.countAll());                List<User> users = userDao.selectAll();        Iterator<User> iter = users.iterator();        while(iter.hasNext()){            User u = iter.next();            System.out.println("用户名："+u.getUserName()+"密码："+u.getPassword());        }                user.setComment("comment");        userDao.update(user);        User u = userDao.findByUserName("hongye");        System.out.println(u.getComment());                userDao.delete("hongye");        System.out.println("记录条数："+userDao.countAll());                session.commit();        session.close();    }}

作者：红枫落叶 
出处：http://www.cnblogs.com/wushiqi54719880/ 
关于作者：专注于Java企业运用、海量数据处理、hadoop、数字图像处理等。
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