我想从 eclipse 连接到 mysql 数据库。我想创建一个 Rest Api 并向 mysql 数据库插入数据。
我正在使用sqlyog连接到mysql，并且我已经安装了xammp服务器，打开了mysql，我的项目位于tihs路径C:\xampp\tomcat\webapps\
我通过提供从 xammp 服务器运行 mysql 的端口来连接 sql yog。
现在我已经创建了一个maven项目，其中包含jpa依赖和属性。
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>com.creditone</groupId>
<artifactId>creditone</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>
<name>creditone</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.RC1</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-web</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-data-jpa</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</pluginRepository>
<pluginRepository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
</project>
应用程序属性
spring.jpa.hibernate.ddl-auto=create
spring.datasource.url=jdbc:mysql://localhost/test
spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.name=test
spring.datasource.username=root
spring.datasource.driver-class-name= com.mysql.jdbc.Driver
spring.jpa.database=mysql
spring.jpa.database-platform=org.hibernate.dialect.MySQLDialect \u2013
主 Controller
package com.creditone.creditone;
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.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import com.creditone.creditone.User;
import com.creditone.creditone.UserRepository;
@Controller // This means that this class is a Controller
@RequestMapping(path="/demo") // This means URL's start with /demo (after Application path)
public class MainController {
@Autowired // This means to get the bean called userRepository
// Which is auto-generated by Spring, we will use it to handle the data
private UserRepository userRepository;
@GetMapping(path="/add") // Map ONLY GET Requests
public @ResponseBody String addNewUser (@RequestParam String name
, @RequestParam String email) {
// @ResponseBody means the returned String is the response, not a view name
// @RequestParam means it is a parameter from the GET or POST request
User n = new User();
n.setName(name);
n.setEmail(email);
userRepository.save(n);
return "Saved";
}
@GetMapping(path="/all")
public @ResponseBody Iterable<User> getAllUsers() {
// This returns a JSON or XML with the users
return userRepository.findAll();
}
}
用户存储库
package com.creditone.creditone;
import org.springframework.data.repository.CrudRepository;
import com.creditone.creditone.User;
// This will be AUTO IMPLEMENTED by Spring into a Bean called userRepository
// CRUD refers Create, Read, Update, Delete
public interface UserRepository extends CrudRepository<User, Long> {
}
用户
package com.creditone.creditone;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity // This tells Hibernate to make a table out of this class
public class User {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Integer id;
private String name;
private String email;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}
尝试使用此代码来检查数据库是否已连接并能够执行 CRUD 操作。
但是当我运行这个时，我收到错误:
main] c.c.creditone.CreditoneApplication : Starting CreditoneApplication on Siddhi with PID 18728 (C:\xampp\tomcat\webapps\creditone\target\classes started by siddhi in C:\xampp\tomcat\webapps\creditone)
2018-02-20 12:31:45.726 INFO 18728 --- [ main] c.c.creditone.CreditoneApplication : No active profile set, falling back to default profiles: default
2018-02-20 12:31:45.756 INFO 18728 --- [ main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@6328d34a: startup date [Tue Feb 20 12:31:45 IST 2018]; root of context hierarchy
2018-02-20 12:31:46.881 INFO 18728 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$99fd5bbe] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2018-02-20 12:31:47.169 INFO 18728 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-02-20 12:31:47.176 INFO 18728 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-02-20 12:31:47.176 INFO 18728 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.27
2018-02-20 12:31:47.181 INFO 18728 --- [ost-startStop-1] 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: [C:\Program Files\Java\jre1.8.0_161\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jre1.8.0_161/bin/server;C:/Program Files/Java/jre1.8.0_161/bin;C:/Program Files/Java/jre1.8.0_161/lib/amd64;C:\ProgramData\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Microsoft SQL Server\140\Tools\Binn\;C:\Program Files (x86)\Microsoft SQL Server\Client SDK\ODBC\130\Tools\Binn\;C:\Program Files (x86)\Microsoft SQL Server\140\DTS\Binn\;C:\Program Files (x86)\Microsoft SQL Server\140\Tools\Binn\ManagementStudio\;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\130\Tools\Binn\;C:\Program Files\Microsoft SQL Server\140\Tools\Binn\;C:\Program Files\Microsoft SQL Server\140\DTS\Binn\;C:\Program Files\Git\bin;C:\Program Files\Microsoft SQL Server\130\Tools\Binn\;C:\Program Files\MySQL\MySQL Utilities 1.6\;C:\Users\Intel\AppData\Local\Microsoft\WindowsApps;;C:\Windows\System32;;.]
2018-02-20 12:31:47.236 INFO 18728 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-02-20 12:31:47.236 INFO 18728 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1483 ms
2018-02-20 12:31:47.339 INFO 18728 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-02-20 12:31:47.342 INFO 18728 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-02-20 12:31:47.342 INFO 18728 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-02-20 12:31:47.342 INFO 18728 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-02-20 12:31:47.342 INFO 18728 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-02-20 12:31:47.389 WARN 18728 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Cannot determine embedded database driver class for database type NONE. If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you may need to active it (no profiles are currently active).
2018-02-20 12:31:47.390 INFO 18728 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2018-02-20 12:31:47.402 INFO 18728 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-02-20 12:31:47.406 ERROR 18728 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Cannot determine embedded database driver class for database type NONE
Action:
If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you may need to active it (no profiles are currently active).
如何解决这个问题？我是 Eclipse 和 Web 开发的新手。请帮忙。 谢谢。
最佳答案
您的 application.properties 似乎有错误的条目。您唯一需要的是以下 4 个。
- spring.datasource.url=jdbc:mysql://localhost/test
- spring.datasource.username=dbuser
- spring.datasource.password=dbpass
- spring.datasource.driver-class-name=com.mysql.jdbc.Driver
您的 application.properties 位于哪里？
SpringApplication will load properties from application.properties files in the following locations and add them to the Spring Environment: A /config subdirectory of the current directory. The current directory A classpath /config package The classpath root
https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-external-config.html
关于java - 如何在eclipse中使用maven和jpa连接mysql数据库？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48879642/