Day30项目saas-export项目-项目搭建-（四）Dao spring与Mybatis的整合***

spring整合Mybatis

检查 pom.xml

有没有spring与mybatis的整合包

     <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>${mybatis.spring.version}</version>
        </dependency>

export_dao

• （1）properties/db.properties
• （2）spring/applicationContext.xml
• （3）定义ICompanyDao
• （4）定义ICompanyDao.xml
• （5）测试

properties/db.properties

# key=value
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/saas-export?characterEncoding=utf-8
jdbc.username=root
jdbc.password=123456

spring/applicationContext-dao.xml

子工程，dao子工程的交给spring管理，创建一个对应的applicationContext-dao.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!--读取db.properties文件-->
    <context:property-placeholder location="classpath:properties/db.properties"></context:property-placeholder>

    <!--1.配置数据源-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="url" value="${jdbc.url}"/>
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!--2.配置Spring整合Mybatis *** 由Spring创建SqlSessionFactory对象-->
    <!--2.1 配置SqlSessionFactoryBean-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"/>
        <!-- com.wzx.domain.company.Company  company-->
        <property name="typeAliasesPackage" value="com.wzx.domain"/>
    </bean>

    <!--2.2 配置Dao接口所在包 动态代理 session.getMapper(Dao.class)-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--指定Dao接口所在包-->
        <property name="basePackage" value="com.wzx.dao"/>
    </bean>

</beans>

ICompanyDao

public interface ICompanyDao {
    
    
    //查询所有的公司记录
    //select * from ss_company
    List<Company> findAll();
}

ICompanyDao.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: 需要映射的Dao接口类型-->
<mapper namespace="com.wzx.dao.company.ICompanyDao">

    <select id="findAll" resultType="company">
        select * from ss_company
    </select>
</mapper>

ICompanyDaoTest

//spring的junit测试的两个注解
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:spring/applicationContext-dao.xml")
public class ICompanyDaoTest {
    
    

    //可以通过@Autowrie 去 spring中获取dao的实现类对象
    @Autowired
    ICompanyDao iCompanyDao;//=new 实现类()
    @Test
    public void findAll() {
    
    
        System.out.println(iCompanyDao);
        //返回所有的企业
        List<Company> list = iCompanyDao.findAll();
        System.out.println(list);
    }
}