在Spring boot 框架中使用JDBC遇到一点问题

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

	<modelVersion>4.0.0</modelVersion>



	<groupId>com.example</groupId>

	<artifactId>HelloWorld</artifactId>

	<version>0.0.1-SNAPSHOT</version>

	<packaging>jar</packaging>



	<name>HelloWorld</name>

	<description>Demo project for Spring Boot</description>



	<parent>

		<groupId>org.springframework.boot</groupId>

		<artifactId>spring-boot-starter-parent</artifactId>

		<version>2.0.0.RELEASE</version>

		<relativePath/> <!-- lookup parent from repository -->

	</parent>



	<properties>

		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

		<java.version>1.8</java.version>

	</properties>



	<dependencies>

	<dependency>

			<groupId>org.springframework.boot</groupId>

			<artifactId>spring-boot-starter-jdbc</artifactId>

		</dependency>

	

		<dependency>

			<groupId>org.springframework.boot</groupId>

			<artifactId>spring-boot-starter-web</artifactId>

		</dependency>

		

		<dependency>

    <groupId>org.springframework</groupId>

    <artifactId>spring-tx</artifactId>

    <version>4.0.2.RELEASE</version>

</dependency>

		



		<dependency>

			<groupId>mysql</groupId>

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

			<version>5.1.21</version>

			<scope>runtime</scope>

		</dependency>

		<dependency>

			<groupId>org.springframework.boot</groupId>

			<artifactId>spring-boot-starter-test</artifactId>

			<scope>test</scope>

		</dependency>

		

	

		

	</dependencies>



	<build>

		<plugins>

			<plugin>

				<groupId>org.springframework.boot</groupId>

				<artifactId>spring-boot-maven-plugin</artifactId>

			</plugin>

		</plugins>

	</build>





</project>

package com.example.demo.App;



import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.context.annotation.ComponentScan;





@ComponentScan(basePackages = {"com.example.demo.Controller","com.example.demo.service"})

@SpringBootApplication

public class HelloWorldApplication {



	public static void main(String[] args) {

		SpringApplication.run(HelloWorldApplication.class, args);

	}

}

package com.example.demo.Controller;



import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

import com.example.demo.service.UserService;



@RestController

public class UserController {

	@Autowired 

    private UserService userService;

	

	@RequestMapping("/creatUser")

	public String createUser(String name, Integer age) {

		userService.createUser(name, age);

		return "success";

	}

}

package com.example.demo.service;



import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.jdbc.core.JdbcTemplate;

import org.springframework.stereotype.Service;



@Service

public class UserService {

	@Autowired

	private JdbcTemplate jdbcTemplate;

	

	public void createUser(String name, Integer age) {

		jdbcTemplate.update("insert into abc values(1,?,?);", name, age);

		

	}



}