spring boot 项目 ，spring data jpa 初使用

我使用的是 maven 构建工具，使用 spring data jpa 来实现简单的用户数据增删改查功能。
项目使用： spring boot、spring data jpa、mysql。
项目使用 postman 工具来测试功能是否实现。

代码

pom.xml 如下：

    4.0.0
    
    com.kaven
    spring-data-jpa
    0.0.1-SNAPSHOT
    jar

    spring-data-jpa
    Demo project for Spring Boot

    
        org.springframework.boot
        spring-boot-starter-parent
        2.1.0.RELEASE
         
    

    
        UTF-8
        UTF-8
        1.8
    

    
        
            org.springframework.boot
            spring-boot-starter-data-jpa
        
        
            org.springframework.boot
            spring-boot-starter-web
        

        
            mysql
            mysql-connector-java
            5.1.31
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

项目结构如下图：

user 表：

 create table user(
    id int auto_increment,
    age int not null,
    primary key(id)
 );

user 表结构如下图：

application.yml 如下：

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/kaven
    username: root
    password: 015036
  jpa:
    hibernate:
      ddl-auto: update #更新
    show-sql: true

show-sql: true
操作数据库中的数据时会生成相应的 sql 语句展示出来。
效果如下图：

User.java 如下：

package com.kaven.springdatajpa.entity;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

/**
 * @program: spring-data-jpa
 * @description: 用户类
 * @author: Kaven
 * @create: 2018-11-16 12:50
 **/
@Entity
public class User {

    //用户唯一标识
    @Id
    @GeneratedValue
    private Integer id;

    //用户年龄
    private Integer age;

    public User() {}

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "{\n" +
                "      id: " + id +",\n"+
                "      age: " + age +
                "\n}";
    }
}

UserController.java 如下：

package com.kaven.springdatajpa.controller;

import com.kaven.springdatajpa.entity.User;
import com.kaven.springdatajpa.repository.UserRepository;
import com.kaven.springdatajpa.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

/**
 * @program: spring-data-jpa
 * @description: 用户数据操作控制器
 * @author: Kaven
 * @create: 2018-11-16 12:53
 **/

@RestController
public class UserController {

    @Autowired
    private UserRepository UserRepository;

    @Autowired
    private UserService UserService;

    /**
    * 获取所有用户信息
    * */
    @GetMapping(value = "/users")
    public List<User> Users() {
        return UserRepository.findAll();
    }

    /**
     * 添加用户
    * */
    @PostMapping(value = "/user/add")
    public User addUser(User User) {
        return UserRepository.save(User);
    }

    /**
     * 根据用户 id 获取用户信息
     * */
    @PostMapping(value = "/user/get")
    public User getUser(@RequestParam("id") Integer id) {
        return UserRepository.findById(id).get();
    }

    /**
     * 更新用户信息
     * */
    @PutMapping(value = "/update")
    public void updateUser(@RequestParam("id") Integer id ,
                           @RequestParam("age") Integer age) {
        UserRepository.updateUser(id , age);
    }

    /**
     * 删除用户信息
     * */
    @DeleteMapping(value = "/user/delete")
    public void UserDelede(@RequestParam("id") Integer id) {
        UserRepository.deleteById(id);
    }

    /**
     * 通过用户年龄查询用户列表
     * */
    @GetMapping(value = "/users/findbyage")
    public List<User> UserListByAge(@RequestParam("age") Integer age) {
        return UserRepository.findByAge(age);
    }

    /**
     * 同时添加两个用户（只能同时添加成功或者同时添加失败）
     * */
    @PostMapping(value = "/users/inserttwo")
    public void insertTwoUsers() {
        UserService.insertTwo();
    }

    /**
     * 通过用户 id 获取用户的年龄
     */
    @GetMapping(value = "/user/id")
    public Integer getAge(@RequestParam("id") Integer id) throws Exception {
        return UserService.getAge(id);
    }
}

UserRepository.java 如下：

package com.kaven.springdatajpa.repository;

import com.kaven.springdatajpa.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * @program: spring-data-jpa
 * @description: 用户数据仓库类
 * @author: Kaven
 * @create: 2018-11-16 13:04
 **/
@Component
public interface UserRepository extends JpaRepository<User, Integer> {

    /**
     * 通过年龄来查询用户列表，根据 spring data jpa 的命名规则来命名方法名
     */
    public List<User> findByAge(Integer age);

    /**
     * 也可以自己写 sql 语句实现
     * 更新用户
     * */
    @Transactional
    @Modifying
    @Query(value = "update User bean set bean.age=?2 where bean.id=?1")
    public void updateUser(Integer id , Integer age);
}

UserService.java 如下：

package com.kaven.springdatajpa.service;

import com.kaven.springdatajpa.entity.User;
import com.kaven.springdatajpa.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * @program: spring-data-jpa
 * @description:  用户数据应用类
 * @author: Kaven
 * @create: 2018-11-16 12:57
 **/

@Service
public class UserService {

    @Autowired
    private UserRepository UserRepository;

    /**
     * 事务处理
     * 两个用户只能同时添加成功，或者同时添加失败
     * */
    @Transactional
    public void insertTwo() {
        User UserA = new User();
        UserA.setAge(19);
        UserRepository.save(UserA);

        User UserB = new User();
        UserB.setAge(22);
        UserRepository.save(UserB);
    }

    /**
     * 根据用户 id 来获取用户的年龄信息
     * */
    public Integer getAge(Integer id) throws Exception {
        User User = UserRepository.findById(id).get();
        Integer age = User.getAge();
        return age;
    }

    /**
     * 根据用户 id 来获取用户信息
     * */
    public User findOne(Integer id) {
        return UserRepository.findById(id).get();
    }
}

程序完成后，启动程序。
如下，说明启动成功：

F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\bin\java.exe -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=50884 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Djava.rmi.server.hostname=localhost -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:F:\Install\CompilerInstall\IntelliJ IDEA 2018.2.4\lib\idea_rt.jar=50885:F:\Install\CompilerInstall\IntelliJ IDEA 2018.2.4\bin" -Dfile.encoding=UTF-8 -classpath F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\charsets.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\deploy.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\ext\access-bridge-64.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\ext\cldrdata.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\ext\dnsns.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\ext\jaccess.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\ext\jfxrt.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\ext\localedata.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\ext\nashorn.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\ext\sunec.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\ext\sunjce_provider.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\ext\sunmscapi.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\ext\sunpkcs11.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\ext\zipfs.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\javaws.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\jce.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\jfr.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\jfxswt.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\jsse.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\management-agent.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\plugin.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\resources.jar;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\lib\rt.jar;F:\Install\CompilerWorkspace\IDEA2\spring-data-jpa\target\classes;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\boot\spring-boot-starter-data-jpa\2.1.0.RELEASE\spring-boot-starter-data-jpa-2.1.0.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\boot\spring-boot-starter-aop\2.1.0.RELEASE\spring-boot-starter-aop-2.1.0.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\spring-aop\5.1.2.RELEASE\spring-aop-5.1.2.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\aspectj\aspectjweaver\1.9.2\aspectjweaver-1.9.2.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\boot\spring-boot-starter-jdbc\2.1.0.RELEASE\spring-boot-starter-jdbc-2.1.0.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\com\zaxxer\HikariCP\3.2.0\HikariCP-3.2.0.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\spring-jdbc\5.1.2.RELEASE\spring-jdbc-5.1.2.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\javax\transaction\javax.transaction-api\1.3\javax.transaction-api-1.3.jar;F:\Install\Apache\apache-maven-3.5.4\repository\javax\xml\bind\jaxb-api\2.3.1\jaxb-api-2.3.1.jar;F:\Install\Apache\apache-maven-3.5.4\repository\javax\activation\javax.activation-api\1.2.0\javax.activation-api-1.2.0.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\hibernate\hibernate-core\5.3.7.Final\hibernate-core-5.3.7.Final.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\jboss\logging\jboss-logging\3.3.2.Final\jboss-logging-3.3.2.Final.jar;F:\Install\Apache\apache-maven-3.5.4\repository\javax\persistence\javax.persistence-api\2.2\javax.persistence-api-2.2.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\javassist\javassist\3.23.1-GA\javassist-3.23.1-GA.jar;F:\Install\Apache\apache-maven-3.5.4\repository\net\bytebuddy\byte-buddy\1.9.3\byte-buddy-1.9.3.jar;F:\Install\Apache\apache-maven-3.5.4\repository\antlr\antlr\2.7.7\antlr-2.7.7.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\jboss\jandex\2.0.5.Final\jandex-2.0.5.Final.jar;F:\Install\Apache\apache-maven-3.5.4\repository\com\fasterxml\classmate\1.4.0\classmate-1.4.0.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\dom4j\dom4j\2.1.1\dom4j-2.1.1.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\hibernate\common\hibernate-commons-annotations\5.0.4.Final\hibernate-commons-annotations-5.0.4.Final.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\data\spring-data-jpa\2.1.2.RELEASE\spring-data-jpa-2.1.2.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\data\spring-data-commons\2.1.2.RELEASE\spring-data-commons-2.1.2.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\spring-orm\5.1.2.RELEASE\spring-orm-5.1.2.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\spring-context\5.1.2.RELEASE\spring-context-5.1.2.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\spring-tx\5.1.2.RELEASE\spring-tx-5.1.2.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\spring-beans\5.1.2.RELEASE\spring-beans-5.1.2.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\spring-aspects\5.1.2.RELEASE\spring-aspects-5.1.2.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\boot\spring-boot-starter-web\2.1.0.RELEASE\spring-boot-starter-web-2.1.0.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\boot\spring-boot-starter\2.1.0.RELEASE\spring-boot-starter-2.1.0.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\boot\spring-boot\2.1.0.RELEASE\spring-boot-2.1.0.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\boot\spring-boot-autoconfigure\2.1.0.RELEASE\spring-boot-autoconfigure-2.1.0.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\boot\spring-boot-starter-logging\2.1.0.RELEASE\spring-boot-starter-logging-2.1.0.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;F:\Install\Apache\apache-maven-3.5.4\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\apache\logging\log4j\log4j-to-slf4j\2.11.1\log4j-to-slf4j-2.11.1.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\apache\logging\log4j\log4j-api\2.11.1\log4j-api-2.11.1.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\slf4j\jul-to-slf4j\1.7.25\jul-to-slf4j-1.7.25.jar;F:\Install\Apache\apache-maven-3.5.4\repository\javax\annotation\javax.annotation-api\1.3.2\javax.annotation-api-1.3.2.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\yaml\snakeyaml\1.23\snakeyaml-1.23.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\boot\spring-boot-starter-json\2.1.0.RELEASE\spring-boot-starter-json-2.1.0.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\com\fasterxml\jackson\core\jackson-databind\2.9.7\jackson-databind-2.9.7.jar;F:\Install\Apache\apache-maven-3.5.4\repository\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;F:\Install\Apache\apache-maven-3.5.4\repository\com\fasterxml\jackson\core\jackson-core\2.9.7\jackson-core-2.9.7.jar;F:\Install\Apache\apache-maven-3.5.4\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.9.7\jackson-datatype-jdk8-2.9.7.jar;F:\Install\Apache\apache-maven-3.5.4\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.9.7\jackson-datatype-jsr310-2.9.7.jar;F:\Install\Apache\apache-maven-3.5.4\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.9.7\jackson-module-parameter-names-2.9.7.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\boot\spring-boot-starter-tomcat\2.1.0.RELEASE\spring-boot-starter-tomcat-2.1.0.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.12\tomcat-embed-core-9.0.12.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.12\tomcat-embed-el-9.0.12.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.12\tomcat-embed-websocket-9.0.12.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\hibernate\validator\hibernate-validator\6.0.13.Final\hibernate-validator-6.0.13.Final.jar;F:\Install\Apache\apache-maven-3.5.4\repository\javax\validation\validation-api\2.0.1.Final\validation-api-2.0.1.Final.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\spring-web\5.1.2.RELEASE\spring-web-5.1.2.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\spring-webmvc\5.1.2.RELEASE\spring-webmvc-5.1.2.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\spring-expression\5.1.2.RELEASE\spring-expression-5.1.2.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\mysql\mysql-connector-java\5.1.31\mysql-connector-java-5.1.31.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\spring-core\5.1.2.RELEASE\spring-core-5.1.2.RELEASE.jar;F:\Install\Apache\apache-maven-3.5.4\repository\org\springframework\spring-jcl\5.1.2.RELEASE\spring-jcl-5.1.2.RELEASE.jar com.kaven.springdatajpa.SpringDataJpaApplication

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.0.RELEASE)

2018-11-16 23:17:03.222  INFO 4504 --- [           main] c.k.s.SpringDataJpaApplication           : Starting SpringDataJpaApplication on DESKTOP-1EB3JGB with PID 4504 (F:\Install\CompilerWorkspace\IDEA2\spring-data-jpa\target\classes started by Kaven in F:\Install\CompilerWorkspace\IDEA2\spring-data-jpa)
2018-11-16 23:17:03.232  INFO 4504 --- [           main] c.k.s.SpringDataJpaApplication           : No active profile set, falling back to default profiles: default
2018-11-16 23:17:05.186  INFO 4504 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2018-11-16 23:17:05.306  INFO 4504 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 100ms. Found 1 repository interfaces.
2018-11-16 23:17:06.038  INFO 4504 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$d8d98785] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2018-11-16 23:17:07.452  INFO 4504 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2018-11-16 23:17:07.502  INFO 4504 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2018-11-16 23:17:07.502  INFO 4504 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/9.0.12
2018-11-16 23:17:07.512  INFO 4504 --- [           main] o.a.catalina.core.AprLifecycleListener   : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\bin;F:\Install\JavaJDK\JDKInstall\jdk1.8.0_181\jre\bin;F:\Install\Apache\apache-tomcat-9.0.12\lib;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\MySQL\MySQL Utilities 1.6\;F:\Install\Apache\apache-maven-3.5.4\bin;C:\Program Files\MySQL\MySQL Server 5.7\bin;F:\Install\web\nodejsInstall\;F:\Install\VersionControlSystem\GitInstall\Git\cmd;F:\Install\DataBase\RedisInstall;C:\Users\Kaven\AppData\Local\Microsoft\WindowsApps;C:\Users\Kaven\AppData\Roaming\npm;.]
2018-11-16 23:17:08.082  INFO 4504 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2018-11-16 23:17:08.082  INFO 4504 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 4750 ms
2018-11-16 23:17:08.212  INFO 4504 --- [           main] o.s.b.w.servlet.ServletRegistrationBean  : Servlet dispatcherServlet mapped to [/]
2018-11-16 23:17:08.232  INFO 4504 --- [           main] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-11-16 23:17:08.232  INFO 4504 --- [           main] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-11-16 23:17:08.232  INFO 4504 --- [           main] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'formContentFilter' to: [/*]
2018-11-16 23:17:08.232  INFO 4504 --- [           main] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2018-11-16 23:17:08.772  INFO 4504 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2018-11-16 23:17:09.111  INFO 4504 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
2018-11-16 23:17:09.790  INFO 4504 --- [           main] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [
	name: default
	...]
2018-11-16 23:17:10.075  INFO 4504 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate Core {5.3.7.Final}
2018-11-16 23:17:10.085  INFO 4504 --- [           main] org.hibernate.cfg.Environment            : HHH000206: hibernate.properties not found
2018-11-16 23:17:10.790  INFO 4504 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.0.4.Final}
2018-11-16 23:17:11.182  INFO 4504 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
2018-11-16 23:17:12.971  INFO 4504 --- [           main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2018-11-16 23:17:14.665  INFO 4504 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2018-11-16 23:17:14.785  WARN 4504 --- [           main] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2018-11-16 23:17:15.184  INFO 4504 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2018-11-16 23:17:15.194  INFO 4504 --- [           main] c.k.s.SpringDataJpaApplication           : Started SpringDataJpaApplication in 12.94 seconds (JVM running for 15.21)

测试

添加用户


添加了两个用户，下面验证添加用户是否成功。

获取所有的用户信息

成功添加了两个用户。

删除用户

验证删除用户成功，如下图：

根据用户 id 获取用户的年龄信息

同时增加两个用户（事务处理）

验证同时添加两个用户成功，如下图，失败的情况可以自己去测一测，我这里是可以的。

根据用户年龄获取用户信息

根据用户 id 获取用户信息

更新用户信息

验证用户数据是否更新，如下图：

测试部分完成了，功能都能实现。
一个 spring data jpa 的简单应用。