Question

关于如何访问mysql数据，我在启动spring指南时遇到了一些问题（请参阅此链接：https://spring.io/guides/gs/accessing-data-mysql/）。我稍微调整了类，所以我有这个代码：

的pom.xml

<?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>org.springframework</groupId>
    <artifactId>gs-mysql-data</artifactId>
    <version>0.1.0</version>

    <parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.6.RELEASE</version>
</parent>

<dependencies>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<!-- JPA Data (We are going to use Repositories, Entities, Hibernate, etc...) -->

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

<!-- Use MySQL Connector-J -->

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

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
</dependencies>

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

<build>
<plugins>
    <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
    </plugin>
</plugins>
</build>

我正在使用这个mainController：的 MainController.java

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import com.resource.iPbackend.UserRepository;
import com.resource.iPbackend.User;

@Controller
@RequestMapping(path = "/main")
public class MainController {

    @Autowired
    private UserRepository userRepository;

    @RequestMapping(path = "/reg", method = RequestMethod.POST)
    public @ResponseBody String regNewUser (@RequestParam String firstName,      @RequestParam String lastName, @RequestParam String email, @RequestParam String password, @RequestParam String username) {
        User n = new User();
        n.setFirstName(firstName);
        n.setLastName(lastName);
        n.setEmail(email);
        n.setPassword(password);
        n.setUsername(username);
        userRepository.save(n);
        return "User is stored in database: " + n;
    }

    @GetMapping(path = "/all")
    public @ResponseBody Iterable<User> getAllUsers() {
        return userRepository.findAll();
    }
}

与此存储库一起：的 UserRepository.java

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import com.resource.iPbackend.User;


@Repository
public interface UserRepository extends CrudRepository<User, Long> {

}

这个实体：的 User.java

import org.springframework.data.annotation.Id;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
@Entity
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;
    private String firstName;
    private String lastName;
    private String email;
    private String password;
    private String username;

    public Integer getId() {
        return id;
    }

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

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }
}

最后我有了这个Application.class：

@EnableAutoConfiguration
@SpringBootApplication
public class IPbackendApplication {

public static void main(String[] args) {

    SpringApplication.run(IPbackendApplication.class, args);
}
}

我收到此错误：

org.springframework.beans.factory.UnsatisfiedDependencyException：使用名称＆＃39; org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration＆＃39;创建bean时出错：通过构造函数参数0表示的不满意的依赖项;嵌套异常是org.springframework.beans.factory.BeanCreationException：创建名称为＆＃39; dataSource＆＃39;的bean时出错。在类路径资源中定义[org / springframework / boot / autoconfigure / jdbc / DataSourceConfiguration $ Tomcat.class]：通过工厂方法的Bean实例化失败;嵌套异常是org.springframework.beans.BeanInstantiationException：无法实例化[org.apache.tomcat.jdbc.pool.DataSource]：工厂方法＆＃39; dataSource＆＃39;抛出异常;嵌套异常是java.lang.IllegalArgumentException：URL必须以＆＃39; jdbc＆＃39;开头。在org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray（ConstructorResolver.java:749）〜[spring-beans-4.3.10.RELEASE.jar：4.3.10.RELEASE] 在org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor（ConstructorResolver.java:189）〜[spring-beans-4.3.10.RELEASE.jar：4.3.10.RELEASE] 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor（AbstractAutowireCapableBeanFactory.java:1193）〜[spring-beans-4.3.10.RELEASE.jar：4.3.10.RELEASE]

感谢您的帮助！

Answer 1

在异常跟踪中查看此消息：

嵌套异常是 org.springframework.beans.BeanInstantiationException：失败 instantiate [org.apache.tomcat.jdbc.pool.DataSource]：工厂方法＆＃39;数据源＆＃39;抛出异常;嵌套异常是 java.lang.IllegalArgumentException：网址必须以＆＃39; jdbc＆＃39; 开头 org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray（ConstructorResolver.java:749）

您很可能无法提供重置application.properties属性的spring.datasource.url文件。
或者你没有正确评估它。

应该看起来像：

spring.datasource.url=jdbc:mysql://localhost/mydb

您可以参考the Spring Boot documentation。

Answer 2

您共享的最后一个属性有一些错误需要修复spring.datasource.data-username=myuser和spring.datasource.data-password=ThePassword

这是如何正确配置spring数据源

的示例

spring.datasource.url=jdbc:mysql://localhost:3306/mydb
spring.datasource.username=myuser
spring.datasource.password=ThePassword

这是Spring documentation

的另一个例子

spring.datasource.url=jdbc:mysql://localhost/test
spring.datasource.username=dbuser
spring.datasource.password=dbpass
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

Answer 3

尝试测试dao层时，我收到了类似的错误。

@RunWith(SpringRunner.class)
@DataJpaTest
public class ItemRepositoryTest {

    @Autowired
    private ItemRepository itemRepository;

    @Test
    public void findAll() {
        List<Item> allItems = itemRepository.findAll();
        Assertions.assertThat(allItems).hasSize(9);
    }
}

通过添加以下内容解决了该问题：

@AutoConfigureTestDatabase（replace = AutoConfigureTestDatabase.Replace.NONE）

到测试班：

@RunWith(SpringRunner.class)
@DataJpaTest
@AutoConfigureTestDatabase(replace=AutoConfigureTestDatabase.Replace.NONE)
public class ItemRepositoryTest {...}

创建名称为＆＃39; dataSource＆＃39;的bean时出错+ Spring Boot + Hibernate

3 个答案: