9.1添加jar包

9.2新建数据表

CREATE TABLE s_user(
user_id INT AUTO_INCREMENT PRIMARY KEY,
user_name VARCHAR(30),
user_birthday DATE,
user_salary DOUBLE
)

9.3新建实体类

User.java

package com.domain;

import java.util.Date;

public class User {
    private int id;
    private String name;
    private Date birthday;
    private double salary;
    public User() {
        super();
    }
    public User(int id, String name, Date birthday, double salary) {
        super();
        this.id = id;
        this.name = name;
        this.birthday = birthday;
        this.salary = salary;
    }
    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 Date getBirthday() {
        return birthday;
    }
    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }
    public double getSalary() {
        return salary;
    }
    public void setSalary(double salary) {
        this.salary = salary;
    }
    @Override
    public String toString() {
        return "User [id=" + id + ", name=" + name + ", birthday=" + birthday
                + ", salary=" + salary + "]";
    }   
}

9.4 DAO 接口: UserMapper

UserMapper.java

package com.mapper;

import java.util.List;

import com.domain.User;

public interface UserMapper {
    void save(User user);

    void update(User user);

    void delete(int id);

    User findById(int id);

    List<User> findAll();
}

9.5 SQL 映射文件: userMapper.xml

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">

<!-- 
  namespace:必须与接口的全类名一致
  id:必须与对应接口的对应方法名一致
 -->
<mapper namespace="com.mapper.UserMapper">
   <insert id="save" parameterType="User"> 
      insert into s_user(user_name,user_birthday,user_salary) values(#{name},#{birthday},#{salary})
   </insert>
   
   <update id="update" parameterType="User">
      update s_user set user_name=#{name},user_birthday=#{birthday},user_salary=#{salary} where user_id=#{id}
   </update>
   
   <delete id="delete" parameterType="int">
      delete from s_user where user_id=#{id}
   </delete>
   
   <select id="findById" parameterType="int" resultType="User">
      select user_id id,user_name name,user_birthday birthday,user_salary salary from s_user where user_id=#{id}
   </select>
   
   <select id="findAll" parameterType="int" resultType="User">
       select user_id id,user_name name,user_birthday birthday,user_salary salary from s_user
   </select>
</mapper>

9.6 spring 的配置文件: beans.xml

beans.xml

<?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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.2.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
    <!-- 1. 数据源 : DriverManagerDataSource -->
    <bean id="ds" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
       <property name="url" value="jdbc:mysql://localhost:3306/mybatis" />
       <property name="username" value="root" />
       <property name="password" value="root" />
       <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    </bean>
    
    <!-- 2. mybatis 的 SqlSession 的工厂: SqlSessionFactoryBean
       dataSource:引用数据源
       typeAliasesPackage：指定实体类的包名，自动将实体类的简单类名映射成别名
     -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
       <property name="dataSource" ref="ds"/>
       <property name="typeAliasesPackage" value="com.domain"/>
    </bean>
    
    <!-- 3. mybatis 自动扫描加载 Sql 映射文件 /接口: MapperScannerConfigurer
        basePackage：指定sql映射文件/接口所在的包（自动扫描）
        sqlSessionFactory:引用上面定义的sqlSessionFactory
     -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
       <property name="basePackage" value="com.mapper"/>
       <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>
    
    <!-- 4. 事务管理 : DataSourceTransactionManager
      dataSource:引用上面定义的数据源
     -->
    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
       <property name="dataSource" ref="ds"/>
    </bean>
    
    <!-- 5. 使用声明式事务
       transaction-manager：引用上面定义的事务管理器
     -->
    <tx:annotation-driven transaction-manager="txManager"/>
</beans>

9.7 mybatis 的配置文件: mybatis-config.xml

mybatis-config.xml

<?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>
    <!-- Spring 整合 myBatis 后，这个配置文件基本可以不要了 -->
    
    <!-- 设置外部配置文件 -->
    
    <!-- 设置类别名 -->
    
    <!-- 设置数据库连接环境 -->
    
    <!-- 映射文件 -->
    
</configuration>

9.8 测试类

SMTest.java

package com.test;

import java.util.Date;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.domain.User;
import com.mapper.UserMapper;


@RunWith(SpringJUnit4ClassRunner.class)//使用spring的测试框架
@ContextConfiguration("/beans.xml") //加载spring的beans.xml配置文件 
public class SMTest {
    
    @Autowired
    private UserMapper userMapper;
    
    //测试添加
    @Test
    public void testAdd()
    {
        userMapper.save(new User(-1,"Tom",new Date(),3000));
    }
    
    //测试update
    @Test
    public void testUpdate()
    {
        userMapper.update(new User(1,"Tom2",new Date(),3000));
    }
}