Question

我从spring数据jpa开始，我已经配置了所有spring应用。我的引导程序类是

@SpringBootApplication
@ComponentScan("com.ticket.booking")
@EnableJpaRepositories("com.ticket.booking.dao")
@EntityScan("com.ticket.booking.entity")
public class TicketBookingManagementApplication {

public static void main(String[] args) {
    SpringApplication.run(TicketBookingManagementApplication.class, args);
}

}

我的控制器

 @RestController
 @RequestMapping(value="/api/ticket")
 public class TicketController {

@Autowired
private TicketService ticketService;



@GetMapping(value="/")
public String welcome(){
    return "Welcome to Ticket Booking Systems";
}

@PostMapping(value="/add")
public Ticket createTicket(@RequestBody Ticket ticket){
    return ticketService.createNewTicket(ticket);
}

@GetMapping(value="/get/{ticketId}")
public Ticket getTicket(@PathVariable ("ticketId") Integer ticketId){

    return ticketService.getTicketById(ticketId);
}

}

服务和存储库

 @Service
 public class TicketService {


@Autowired
private TicketDao ticketDao;


public Ticket createNewTicket(Ticket ticket) {
    // TODO Auto-generated method stub
    return ticketDao.save(ticket);
}


public Ticket getTicketById(Integer ticketId) {
    // TODO Auto-generated method stub
    return ticketDao.findOne(ticketId);
}


}


public interface TicketDao extends CrudRepository<Ticket, Integer>{}

在pom.xml中我已添加

   <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>

它使用mysql-connector-java-5.1.46.jar:5.1.46并成功映射了req，但是在运行应用程序时出现

之类的错误

  java.sql.SQLException: Unknown system variable 'language'

并将架构导出到数据库

Answer 1

更新您的mysql-connector版本。它会解决您的问题。

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.35</version>

属性：

spring.datasource.url=jdbc:mysql://localhost/schema_name
spring.datasource.username=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.database-platform=org.hibernate.dialect.MySQL5InnoDBDialect

Answer 2

我发布此答案是因为有人可能会从中受益。

就我而言，我正在使用Spring-boot，因此pom.xml中的依赖项为

df['conditional_sum'] = result
df.to_csv('file.csv')

因此Spring Boot从Spring Boot父级那里获取了一些默认的依赖版本，这与我的系统安装的mysql-server版本5.1.22不同，所以这就是该错误的原因。

因此，要解决此错误，我通过如下手动指定覆盖了版本。

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

它奏效了。

获取：java.sql.SQLException：未知系统变量“语言”的春季启动

2 个答案: