spring和mybatis的整合(包含原始dao的整合方式和mapper代理整合方式)

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一.原始dao的开发的整合方式

1.引入jar包

spring的jar包

mybatis的jar包

由mybatis提供的mybatis和spring的整合jar包(mybatis-spring-xxx.jar)

mysql的驱动jar包(mysql-connector-java-5.1.22-bin.jar)

c3p0数据源的jar(c3p0-0.9.5.1.jar)

2.引入配置文件和dao的实现代码

结构如下:

技术分享

  1. UserDao接口的代码
    package com.si.demo.dao;
    import com.si.demo.entity.User;
    public interface UserDao {
    
        public User findUserById(Integer id);
        
    }
  2. UserDaoImpl实现类的代码
  3. package com.si.demo.dao;
    
    import org.apache.ibatis.session.SqlSession;
    import org.apache.ibatis.session.SqlSessionFactory;
    import com.si.demo.entity.User;
    
    public class UserDaoImpl implements UserDao {
        
        private SqlSessionFactory sqlSessionFactory;
        
    
        public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {
            this.sqlSessionFactory = sqlSessionFactory;
        }
    
        @Override
        public User findUserById(Integer id) {
            SqlSession sqlSession = sqlSessionFactory.openSession();
            User user = sqlSession.selectOne("test.findUserById", id);
            return user;
        }
    }
  4. mybatis-config.xml中的配置
    <?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="user.xml"/>  
        </mappers>
    </configuration>
  5. spring-mybatis.xml中的配置
    <?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:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.0.xsd">
    
        
        <!-- ========================================配置数据源========================================= -->
        <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
            <property name="driverClass" value="com.mysql.jdbc.Driver"/>
            <property name="jdbcUrl" value="jdbc:mysql:///mybatis2" />
            <property name="user" value="root" />
            <property name="password" value="123456" />
        </bean>
        
        <!-- ========================================分隔线========================================= -->
        
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource"></property>
            <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        </bean>
        
        <bean id="userDao" class="com.si.demo.dao.UserDaoImpl">
            <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
        </bean>
      
    </beans>
  6. user.xml的配置
    <?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="test">
        
        <select id="findUserById" parameterType="int" resultType="com.si.demo.entity.User">
         select * from t_user where id = #{id}
        </select>
    </mapper>

3.Junit测试

 @Test
    public void findUserByIdTest(){
        ApplicationContext ctx = new ClassPathXmlApplicationContext("spring-mybatis.xml");
        UserDao userDao = (UserDao) ctx.getBean("userDao");
        User user = userDao.findUserById(1);
        System.out.println(user);
    }

 

 二.Mapper代码开发的整合方式

1.引入jar包

spring的jar包

mybatis的jar包

由mybatis提供的mybatis和spring的整合jar包(mybatis-spring-xxx.jar)

mysql的驱动jar包(mysql-connector-java-5.1.22-bin.jar)

c3p0数据源的jar(c3p0-0.9.5.1.jar)

※和上面的方式jar一样

2.引入配置文件和dao的实现代码

结构如下:

技术分享

  1. UserMapper接口的代码
    package com.si.demo.mapper;
    
    import com.si.demo.entity.User;
    
    public interface UserMapper {
       
        public User findUserById(Integer id);
        
    }
  2. UserMapper.xml配置
    <?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.si.demo.mapper.UserMapper">
        <!-- mapper代理开发方式,namespace的值必须是对应接口的全类名 -->
        <select id="findUserById" parameterType="int" resultType="com.si.demo.entity.User">
         select * from t_user where id = #{id}
        </select>
    </mapper> 
  3. spring-mybatis.xml配置
    <?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:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.0.xsd">
    
        
        <!-- ========================================配置数据源========================================= -->
        <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
            <property name="driverClass" value="com.mysql.jdbc.Driver"/>
            <property name="jdbcUrl" value="jdbc:mysql:///mybatis2" />
            <property name="user" value="root" />
            <property name="password" value="123456" />
        </bean>
        
        <!-- ========================================分隔线========================================= -->
        
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource"></property>
            <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        </bean>
        
        <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
            <property name="mapperInterface" value="com.si.demo.mapper.UserMapper"></property>
            <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
        </bean>
    </beans>
  4. mybatis-config.xml

        注意:当UserMapper.xml和对应的UserMapper接口在同一个目录下面的时候,此时这个配置文件可以省略

        如果不在同一目录,这里需要在mapper里面配上其目录

<?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="UserMapper.xml的目录"/>
        
    </mappers>
</configuration>

  3.Junit测试 

@Test
    public void findUserByIdTest2(){
        ApplicationContext ctx = new ClassPathXmlApplicationContext("spring-mybatis.xml");
        UserMapper userDao = (UserMapper) ctx.getBean("userMapper");
        User user = userDao.findUserById(1);
        System.out.println(user);
    }

注意:上面的mapper代理开发的整合方式,存在一些问题

实际的开发过程中,不可能只有一个userMapper,可能还有orderMapper,等等,不可能将所有的xxMapper都配置一遍,那样也太麻烦了,

mybatis的整合包给我们提供了一个扫描类MapperScannerConfigurer,用它就可以了

值需要在上面的spring-mybatis.xml中做一丢丢改变就可以了,如下

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.si.demo.mapper"></property>
        <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
    </bean>
    <!-- 将下面的mapper的配置,改成上面的扫描方式,通过来扫描mapper接口所在的报包名,当有多个包的时候,用半角逗号分隔即可
然后再次强调下,这种方式的配置,UserMapper.xml必须和对应的接口放在同一个目录下面
-->
<!-- <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean"> <property name="mapperInterface" value="com.si.demo.mapper.UserMapper"></property> <property name="sqlSessionFactory" ref="sqlSessionFactory"></property> </bean> -->

 

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