一、表（这里用mysql，数据库名为yiibai）

CREATE TABLE `user` (`id` int(10) UNSIGNED NOT NULL,`name` varchar(64) NOT NULL DEFAULT '',`dept` varchar(254) NOT NULL DEFAULT '',`website` varchar(254) DEFAULT '',`phone` varchar(16) NOT NULL DEFAULT '',`birthday` date DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;--
-- Indexes for table `user`
--
ALTER TABLE `user`ADD PRIMARY KEY (`id`);

二、表相应的实体类User.java(pojo)以及mybatis表map配置文件User.xml

package com.yiibai.mybatis.models;import java.util.Date;public class User {public User(int id, String name, String dept, String phone, String website, Date birthday) {super();this.id = id;this.name = name;this.dept = dept;this.phone = phone;this.website = website;this.birthday = birthday;}public User() {super();// TODO 自动生成的构造函数存根}private int id;private String name;private String dept;private String phone;private String website;private Date birthday;public String getWebsite() {return website;}public void setWebsite(String website) {this.website = website;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getDept() {return dept;}public void setDept(String dept) {this.dept = dept;}public String getPhone() {return phone;}public void setPhone(String phone) {this.phone = phone;}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}@Overridepublic String toString() {return "User [id=" + id + ", name=" + name + ", dept=" + dept + ", phone=" + phone + ", website=" + website+ ", birthday=" + birthday + "]";}}

配置文件User.xml和User类一样放在包com.yiibai.mybatis.models下，这里只是为了解释和注解方法混用就配置了 GetUserByID一个方法，实际应用可能XML配置更强大、但注解方式更直观便于理解。

<?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.yiibai.mybatis.models.UserMapper"><select id="GetUserByID" parameterType="int" resultType="User">select * from `user` where id = #{id}</select>
</mapper>

三、Dao接口

package com.yiibai.mybatis.dao;import java.util.List;import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;import com.yiibai.mybatis.models.User;public interface IUser {@Select("select * from user where id= #{id}")public User getUserByID(int id);@Insert("insert into user(id, name, dept,phone,website,birthday) values(#{id}, #{name}, #{dept},#{phone}, #{website}, #{birthday})")public int insertUser(User user);@Delete("delete from user where id=#{id}")public int deleteUserById(int id);@Update("update user set name=#{name},dept=#{dept},phone=#{phone},website=#{website},birthday=#{birthday} where id=#{id}")public int updateUser(User user);@Select("select * from user")public List<User> getAllUser();public User oneByID(int id);}

这里唯一没有用注解的方法oneByID用XML方式来实现

四、Dao实现类UserDaoImpl继承SqlSessionDaoSupport并实现了刚才的IUser接口

package com.yiibai.mybatis.daoimpl;import java.util.List;import org.mybatis.spring.support.SqlSessionDaoSupport;import com.yiibai.mybatis.dao.IUser;
import com.yiibai.mybatis.models.User;public class UserDaoImpl extends SqlSessionDaoSupport implements IUser {@Overridepublic User getUserByID(int id) {// TODO 自动生成的方法存根return    this.getSqlSession().getMapper(IUser.class).getUserByID(id);}@Overridepublic int insertUser(User user) {// TODO 自动生成的方法存根return this.getSqlSession().getMapper(IUser.class).insertUser(user);}@Overridepublic int deleteUserById(int id) {// TODO 自动生成的方法存根return this.getSqlSession().getMapper(IUser.class).deleteUserById(id);}@Overridepublic int updateUser(User user) {// TODO 自动生成的方法存根return this.getSqlSession().getMapper(IUser.class).updateUser(user);}@Overridepublic List<User> getAllUser() {// TODO 自动生成的方法存根return this.getSqlSession().getMapper(IUser.class).getAllUser();}@Overridepublic User oneByID(int id) {// TODO 自动生成的方法存根return this.getSqlSession().selectOne("com.yiibai.mybatis.models.UserMapper.GetUserByID", id);}}

这里可以看出oneByID方法是通过调用User.xml名字空间com.yiibai.mybatis.models.UserMapper下面GetUserByID的方法来完成的。

五、配置文件

mybatis配置文件cfg.xml和spring bean的配置文件Userbean.xml都放在com.yiibai.mybatis下：

<?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 alias="User" type="com.yiibai.mybatis.models.User" /></typeAliases><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://127.0.0.1:3306/yiibai?useSSL=false" /><property name="username" value="y-user" /><property name="password" value="y-passwd" /></dataSource></environment></environments><mappers><!-- XML的方式 注册映射配置文件--><mapper resource="com/yiibai/mybatis/models/User.xml" /> <!--接口的方式  注册接口--><mapper class="com.yiibai.mybatis.dao.IUser"/></mappers></configuration>

可以看出mapper中把XML和接口方式都加载了。

也可以在主类中调用this.sqlSessionFactory.getConfiguration().addMapper(IUser.class)来注册

<?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:tx="http://www.springframework.org/schema/tx"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/txhttp://www.springframework.org/schema/tx/spring-tx.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop.xsdhttp://www.springframework.org/schema/jeehttp://www.springframework.org/schema/jee/spring-jee.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/utilhttp://www.springframework.org/schema/util/spring-util.xsdhttp://www.springframework.org/schema/toolhttp://www.springframework.org/schema/tool/spring-tool.xsd"><bean id="dataSource1" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">        <property name="driverClassName" value="com.mysql.jdbc.Driver" />       <property name="url" value="jdbc:mysql://localhost:3306/yiibai?useSSL=false" />       <property name="username" value="your-name" />       <property name="password" value="your-passwd" />       </bean><bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><property name="dataSource" ref="dataSource1" /><property name="configLocation"value="classpath:com/yiibai/mybatis/cfg.xml" /></bean><bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"><constructor-arg ref="sqlSessionFactory" /></bean><bean id="MybatisUserDao" class="com.yiibai.mybatis.daoimpl.UserDaoImpl"><property name="sqlSessionTemplate" ref="sqlSession" /></bean></beans>

六、主类

package com.yiibai.mybatis;import java.sql.Date;
import java.util.List;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;import com.yiibai.mybatis.dao.IUser;
import com.yiibai.mybatis.models.User;public class UserBeanTest {private static ApplicationContext ctx;public static void main(String[] args) throws Exception {ctx = new ClassPathXmlApplicationContext("com/yiibai/mybatis/Userbean.xml");IUser iuser = (IUser) ctx.getBean("MybatisUserDao");User user = new User(2, "yiibai2", "Tech", "13800009900", "http://www.zjptcc.com", Date.valueOf("1977-08-09"));iuser.insertUser(user);System.out.println(iuser.getUserByID(2));System.out.println(iuser.oneByID(2));List<User> users = iuser.getAllUser();for (User u : users) {System.out.println("user ID " + u.getId());System.out.println("名字： " + u.getName());System.out.println("所属部门" + u.getDept());System.out.println("电话" + u.getPhone());System.out.println("网址" + u.getWebsite());System.out.println("日期" + u.getBirthday());System.out.println("----------------------------");}iuser.deleteUserById(2);}}

七、sping bean不是必须配置的（不配置Userbean.xml），可以在主类中声明一个SqlSessionFactory变量，这时主类可以是这样子：

package com.yiibai.mybatis;import java.io.Reader;
import java.text.ParseException;
import java.text.SimpleDateFormat;
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 com.yiibai.mybatis.dao.IUser;
import com.yiibai.mybatis.models.*;/*** * @author yiibai* @copyright http://www.yiibai.com* @date 2015/09/22*/
public class TestUser {private static SqlSessionFactory sqlSessionFactory;private static Reader reader;static {try {reader = Resources.getResourceAsReader("com/yiibai/mybatis/cfg.xml");sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);} catch (Exception e) {e.printStackTrace();}}public static SqlSessionFactory getSession() {return sqlSessionFactory;}/*** @param args* @throws ParseException */public static void main(String[] args) throws ParseException {// TODO Auto-generated method stubSqlSession session = sqlSessionFactory.openSession();try {User user = (User) session.selectOne("com.yiibai.mybatis.models.UserMapper.GetUserByID", 1);System.out.println(user);IUser userInterface = session.getMapper(IUser.class);user = (User) userInterface.getUserByID(1);System.out.println(user);userInterface.insertUser(new User(2,"依依2","Tech","13800009922","http://www.zjptcc.com", new SimpleDateFormat("yyyy-MM-dd").parse("1973-11-05"))) ;List<User> users = userInterface.getAllUser();for (User u : users) {System.out.println("user ID " + u.getId());System.out.println("名字： " + u.getName());System.out.println("所属部门" + u.getDept());System.out.println("电话" + u.getPhone());System.out.println("网址" + u.getWebsite());System.out.println("日期" + u.getBirthday());System.out.println("----------------------------");}userInterface.deleteUserById(2);session.commit();} finally {session.close();}}}

Spring 的持久化实例

springboot和mybatis结合