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自动扫描，依赖注入

0

1

spring

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 源码

                                   <!-- spring提供的数据源事务管理器  -->
    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!-- 启动@Transactional注解,将来哪个组件方法带有该标记就会切入tx事务管理功能 -->
    <tx:annotation-driven transaction-manager="txManager"/>
    <!-- 采用自动扫描的方式交给spring管理 -->
    <context:compoment-scan base-package="cn.jdbcspring.jcc"/>
</beans>

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Spring的IOC在JDBC或者Mybatis具体是怎么实现的？

0

1

spring

class="cursor-pointer"> 详细描述

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@Autowired 注解接口TnDao，不能实例化

0

1

spring

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

@Service
public class TnService {

    @Autowired
    private TnDao tnDao;

    private static ApplicationContext context;

    static {
        context = new
                ClassPathXmlApplicationContext("applicationContext.xml");
    }

    public static void main(String[] args) {
        TnService ts = new TnService();
//        ts.tnDao = (TnDao) context.getBean("tnDao");
        Trainees tn = ts.findById(2033);
        System.out.println(tn);
    }

    public Trainees findById(int id) {
        Trainees tn = tnDao.findById(id);
        return tn;
    }

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springboot+jpa的小demo访问不了

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1

spring

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

@Controller
public class HelloBootController {

    @Autowired
    UserRepository userRepository;

    @Autowired
    User user;

    @RequestMapping("/toHello")
    public String toHello(ModelMap modelMap){
        userRepository.save(new User("Mshu","123456","zhuiqiu95@foxmail.com"));
        List<User> users = userRepository.findAll();
        modelMap.put("users",users);
        return "helloBoot";
    }
__________________________________________________________________________________________________

/**
 * 创建Dao接口, springboot 将接口类会自动注解到spring容器中，
 *  不需要我们做任何配置，只需要继承JpaRepository 即可
 */

public interface UserRepository extends JpaRepository<User,Long> {
}

____________________________________________________________________________________________________
spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.properties.hibernate.hbm2ddl.auto=update

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linux配置mysql 执行scripts/mysql_install_d出错

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1

linux命令

class="cursor-pointer"> 详细描述

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多条件查询出错

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1

mybatis

class="cursor-pointer"> 详细描述

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为什么构造方法是整个对象构造过程的最后一步？

0

1

spring

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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spring整合hibernate使用注解方式获取错误

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1

spring

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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jdbctemplate批量插入的时候出现“java heap space”错误

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1

JDBC

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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mybatis在连接数据库中运行项目时找不到项目文件。

0

1

spring

class="cursor-pointer"> 详细描述

log4j:WARN No appenders could be found for logger (org.apache.ibatis.logging.LogFactory).

log4j:WARN Please initialize the log4j system properly.

log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException:

### Error building SqlSession.

### The error may exist in SQL Mapper Configuration

### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.io.IOException: Could not find resource jdbc.properties

at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)

at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:80)

at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:64)

at Test.main(Test.java:18)

Caused by: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.io.IOException: Could not find resource jdbc.properties

at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:121)

at org.apache.ibatis.builder.xml.XMLConfigBuilder.parse(XMLConfigBuilder.java:99)

at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:78)

... 2 more

Caused by: java.io.IOException: Could not find resource jdbc.properties

at org.apache.ibatis.io.Resources.getResourceAsStream(Resources.java:114)

at org.apache.ibatis.io.Resources.getResourceAsStream(Resources.java:100)

at org.apache.ibatis.io.Resources.getResourceAsProperties(Resources.java:128)

at org.apache.ibatis.builder.xml.XMLConfigBuilder.propertiesElement(XMLConfigBuilder.java:225)

at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:106)

... 4 more

Process finished with exit code 1

class="cursor-pointer"> 错误截图