java - 如何将 Spring Boot 与 MySQL 数据库和 JPA 一起使用？

Question

我想用 MySQL 和 JPA 设置 Spring Boot。为此，我创建:人

package domain;

import javax.persistence.*;

@Entity
@Table(name = "person")
public class Person {

@Id
@GeneratedValue
private Long id;

@Column(nullable = false)
private String firstName;

// setters and getters
}

PersonRepository

package repository;

import domain.Person;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.repository.CrudRepository;


public interface PersonRepository extends CrudRepository<Person, Long> {

Page<Person> findAll(Pageable pageable);
}

PersonController

package controller;

import domain.Person;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import repository.PersonRepository;

@Controller
public class PersonController {

@Autowired
private PersonRepository personRepository;

@RequestMapping("/")
@ResponseBody
public String test() {
    Person person = new Person();
    person.setFirstName("First");
    person.setLastName("Test");
    personRepository.save(person);
    return "hello";
}
}

开始类示例:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Example {

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

}

对于数据库配置，我创建 application.properties

spring.jpa.hibernate.ddl-auto=create-drop
spring.jpa.properties.hibernate.globally_quoted_identifiers=true

spring.datasource.url=jdbc:mysql://localhost/test_spring_boot
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driverClassName=com.mysql.jdbc.Driver

所以我有项目结构:

但结果我有异常(exception):

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [Example]; nested exception is java.io.FileNotFoundException: class path resource [org/springframework/security/config/annotation/authentication/configurers/GlobalAuthenticationConfigurerAdapter.class] cannot be opened because it does not exist

作为示例，我使用:spring-boot-sample-data-jpa/pom.xml

Answer 1

我像你一样创建了一个项目。结构是这样的

这些类(class)只是从您的类(class)中复制粘贴而来。

我将 application.properties 更改为:

spring.datasource.url=jdbc:mysql://localhost/testproject
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.jpa.hibernate.ddl-auto=update

但我认为您的问题出在您的 pom.xml 中:

<?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>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.1.RELEASE</version>
</parent>

<artifactId>spring-boot-sample-jpa</artifactId>
<name>Spring Boot JPA Sample</name>
<description>Spring Boot JPA Sample</description>

<dependencies>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

检查这些文件是否存在差异。希望这会有所帮助

更新 1:我更改了用户名。该示例的链接现在是 https://github.com/Yannic92/stackOverflowExamples/tree/master/SpringBoot/MySQL