Intellij IDEA 与 DB 的连接问题

Question

我已经从 git 导入了 spring-boot maven 项目。本项目使用Mysql。 我在工作台中创建了具有自定义名称的数据库。

application.properties 文件：

spring.datasource.url = jdbc:mysql://localhost:3306/myDb?autoReconnect=true&useSSL=false
spring.datasource.username = root
spring.datasource.password= root

我放入 intellij 的 db-connection 窗口的凭据相同。 当我点击“测试连接”时，我得到了：

Connection to myDb@localhost failed.
[42000][1049] Unknown database 'myDb' 

Pom.xml：

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
        <version>LATEST</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-configuration-processor</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>io.jsonwebtoken</groupId>
        <artifactId>jjwt</artifactId>
        <version>0.7.0</version>
    </dependency>
.....

============更新==============

应用程序无法以错误开始：

    2018-04-26 13:12:22.404 ERROR 3988 --- [ost-startStop-1] o.s.b.c.embedded.tomcat.TomcatStarter    : Error starting Tomcat context. Exception: org.springframework.beans.factory.UnsatisfiedDependencyException. Message: Error creating bean with name 'jwtFilterRegistration' defined in com.edsson.expopromoter.api.Application: Unsatisfied dependency expressed through method 'jwtFilterRegistration' parameter 1; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userService' defined in file [C:\Users\koliada\Desktop\IdeaProjects\ExpoPromoter\expopromoter-api\target\classes\com\edsson\expopromoter\api\user\service\UserService.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Cannot create inner bean '(inner bean)#64607e71' of type [org.springframework.orm.jpa.SharedEntityManagerCreator] while setting bean property 'entityManager'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#64607e71': Cannot resolve reference to bean 'entityManagerFactory' while setting constructor argument; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'entityManagerFactory' available
2018-04-26 13:12:22.428  WARN 3988 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.boot.context.embedded.EmbeddedServletContainerException: Unable to start embedded Tomcat
2018-04-26 13:12:22.478 ERROR 3988 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

Description:

Parameter 0 of constructor in com.edsson.expopromoter.api.user.service.UserService required a bean named 'entityManagerFactory' that could not be found.

Answer 1

它说

未知数据库'myDb'

那么你有没有检查过这个数据库是否已经存在？

由于 intellij 的 db-connection 无法访问该数据库，因此问题可能存在于您的连接参数（URL、用户名、密码）或 mysql，而不是代码中。