spring和mybatis整合

spring和mybatis整合

mybatis的前身即ibatis，两者之间有较大的差别，这里主要说mybatis，从配置上来看，mybatis很像hibernate的配置，或许是开发者有意为之吧，用过hibernate的人也更加容易入手。
首先，先创建一张表，插入两条数据：

create tableuser_c(id int primary key not null,name varchar(50),age int,address varchar(200));

insert into user_c values(1,'张三',22,'公司')

insert into user_c values(2,'李四',22,'村儿里')

[b]接着就是代码部分的书写了，项目目录和用到的jar包如下[/b]

先在model目录下写一个实体类User
public class User {

private int id;

private String name;

private int age;

private String address;

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 int getAge() {

return age;

}

public void setAge(int age) {

this.age = age;

}

public String getAddress() {

return address;

}

public void setAddress(String address) {

this.address = address;

}

public User() {

super();

}

public User(int id, String name, int age, String address) {

super();

this.id = id;

this.name = name;

this.age = age;

this.address = address;

}

}

接着写Dao，是一接口，这些接口的方法名要跟下面的mapper文件的id名保持一致这样才能做到一一对应，下面是UserDao部分的代码：
public interface UserDao {

public User getUserById(int id);

public void insertUser(User user);

public void updateUser(User user);

public void deleteUser(int id);

public List<User> getAllUser();

}

接着是跟UserDao对应的UserDaoMapper.xml文件，用于书写sql语句：
<?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.springmybatis.test.dao.UserDao">

<!-- 新增记录 -->

<insert id="insertUser" parameterType="com.springmybatis.test.model.User" useGeneratedKeys="true" keyProperty="id">

insert into user_c(id,name,age,address) values(#{id},#{name},#{age},#{address})

</insert>

<!-- 查询单条记录 -->

<select id="getUserById" parameterType="int" resultType="com.springmybatis.test.model.User">

select * from user_c where id = #{id}

</select>

<!-- 修改记录 -->

<update id="updateUser" parameterType="com.springmybatis.test.model.User">

update user_c set name = #{name} where id = #{id}

</update>

<!-- 查询所有记录 -->

<select id="getAllUser" resultType="com.springmybatis.test.model.User">

select * from user_c

</select>

<!-- 删除记录 -->

<delete id="deleteUser" parameterType="int">

delete from user_c where id = #{id}

</delete>

</mapper>

基本上测试的话上面的代码就可以了，剩下的就是配置文件的书写了，但是这里习惯性的写了个service层，UserService文件的代码如下：
@Service

public class UserService {

@Autowired

UserDao userDao;

public User getUserById(int id) {

return userDao.getUserById(id);

}

public void insertUser(User user) {

userDao.insertUser(user);

}

public void updateUser(User user) {

System.out.println("sssssssssssssssss");

userDao.updateUser(user);

}

public void deleteUser(int id) {

userDao.deleteUser(id);

}

public List<User> getAllUser() {

return userDao.getAllUser();

}

}

下面写spring配置文件applicationContext.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:context="http://www.springframework.org/schema/context"

xmlns:aop="http://www.springframework.org/schema/aop"

xmlns:tx="http://www.springframework.org/schema/tx"

xmlns:jdbc="http://www.springframework.org/schema/jdbc"

xsi:schemaLocation="http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd">

<context:property-placeholder location="classpath:jdbc.properties" />

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">

<property name="driverClassName" value="${jdbc.driver}" />

<property name="url" value="${jdbc.url}" />

<property name="username" value="${jdbc.username}" />

<property name="password" value="${jdbc.password}" />

</bean>

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

<property name="dataSource" ref="dataSource" />

<!-- <property name="configLocation" value="mybatis-config.xml"></property> -->

<property name="mapperLocations" value="classpath:com/springmybatis/test/dao/*.xml"></property>

</bean>

<!-- 下面注释的内容适合Dao比较少的情况，如果有多个Dao还去这样写就显得很麻烦 -->

<!-- <bean class="org.mybatis.spring.mapper.MapperFactoryBean">

<property name="mapperInterface" value="com.springmybatis.test.dao.UserDao"></property>

<property name="sqlSessionFactory" ref="sqlSessionFactory"></property>

</bean> -->

<!-- 下面这样的配置其实也是扫描包，直接扫描存放Dao的包就好了，如果有很多的Dao用这样的配置 -->

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">

<property name="basePackage" value="com.springmybatis.test.dao" />

</bean>

<context:component-scan base-package="com.springmybatis.test.dao" />

<context:component-scan base-package="com.springmybatis.test.service" />

</beans>

使用mybatis，也要有mybatis的配置文件，mybatis-config.xml，代码如下：
<?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>

<mappers>

<mapper resource="com/springmybatis/test/dao/UserMapper.xml"/>

</mappers>

</configuration>

最后就可以写测试类来测试，程序能否正常跑起来了，测试类如下：
@RunWith(SpringJUnit4ClassRunner.class)

@ContextConfiguration(locations = { "classpath:/applicationContext.xml" })

public class UserController {

@Autowired

UserService userService;

@Test

public void test1() {

User user = userService.getUserById(1);

System.out.println(user.getName());

}

@Test

public void main() {

User user = new User();

// 修改数据

user.setId(1);

user.setName("强强5");

user.setAge(12);

user.setAddress("fffffffffffffffffffff");

userService.updateUser(user);

// 删除数据

userService.deleteUser(2);

System.out.println("删除成功");

}

}

右键----》Run as ---->junit test就可以了