spring-mybatis

2、spring-mybatis.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:aop="http://www.springframework.org/schema/aop"
   xmlns:context="http://www.springframework.org/schema/context"
   xsi:schemaLocation="
   http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans.xsd
   http://www.springframework.org/schema/aop 
   http://www.springframework.org/schema/aop/spring-aop.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context.xsd">

<!--开启组建扫描-->
<context:component-scan base-package="service所在的包"/>

<!--加载properties配置文件-->
<context:property-placeholder location="数据库配置文件"/>

<bean class="com.alibaba.druid.pool.DruidDataSource" id="dataSource">
    <property name="driverClassName" value="${jdbc.driverClassName}"/>
    <property name="url" value="${jdbc.url}"/>
    <property name="username" value="${jdbc.username}"/>
    <property name="password" value="${jdbc.password}"/>
</bean>

<!--配置SqlSessionFactory-->
<bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sessionFactory">
    <!--数据源-->
    <property name="dataSource" ref="dataSource"/>
    <!--扫描mapper文件-->
    <property name="mapperLocations" value="mapper xml文件所在目录"/>
    <!--配置别名，可有可无-->
    <property name="typeAliasesPackage" value="实体类所在目录"/>
    <!--加载配置文件，可有可无-->
    <!--<property name="configLocation" value="mybatis配置文件"/>-->
</bean>

<!--配置MapperScannerConfigurer：用来扫描mapper接口，并且创建接口的实现类 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" id="mapperScannerConfigurer">
    <!--注入sqlSessionFactory-->
    <property name="sqlSessionFactoryBeanName" value="sessionFactory"/>
    <!--扫描某个包下的接口-->
    <property name="basePackage" value="实体类包名"/>
</bean>

db.properties

jdbc.driverClassName=com.mysql.jdbc.Driver

jdbc.url=jdbc:mysql:///taobao?useUnicode=true&characterEncoding=utf-8

jdbc.username=root

jdbc.password=

3、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">
<mapper namespace="com.study.dao.UserDao">
<select id="selectUserById" resultType="User">
    select * from user where uid=#{value}
</select>
</mapper>

4、dao层

public interface UserDao {
    public User selectUserById(Integer uid);
}

5、service层

@Service //创建对象
public class UserServiceImpl implements IUserService {
    @Autowired //注入userdao的实现类
    private UserDao userDao;

    public User selectUserById(Integer uid) {
        return userDao.selectUserById(uid);
    }
}

6、测试类

public void testSelectUserById(){
    ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext("spring-mybatis.xml");
    IUserService service = context.getBean(UserServiceImpl.class);
    User user = service.selectUserById(3);
    System.out.println(user);
}

1、导包

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>
    <!--下面是spring的jar-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context-support</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aop</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.8.10</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aspects</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <!--mybatis-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.4.5</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>1.3.1</version>
    </dependency>

    <!--数据源-->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.1.4</version>
    </dependency>

    <!--mysql-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.30</version>
    </dependency>
  </dependencies>