java - 在 Spring Boot 中配置数据库

Question

我正在尝试在 Spring Boot 中配置 mysql 数据库。但我似乎不能这样做。我对此很陌生，所以我不知道自己在做什么。我尝试过搜索。请帮助我缺少什么:

应用程序属性:

  ## Spring DATASOURCE (DataSourceAutoConfiguration & DataSourceProperties)
     spring.datasource.driver-class-name=com.mysql.jdbc.Driver
     spring.jpa.show-sql=true
  spring.datasource.url = jdbc:mysql://localhost:3306/users_database? 
   useSSL=false
 spring.datasource.username = sa
 spring.datasource.password = root


 ## Hibernate Properties
 # The SQL dialect makes Hibernate generate better SQL for the chosen database
 spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5InnoDBDialect

 # Hibernate ddl auto (create, create-drop, validate, update)
 spring.jpa.hibernate.ddl-auto = update

 info.app.name=Spring Boot - RestTemplate CRUD Rest Client Example
 info.app.description=Spring Boot - RestTemplate CRUD Rest Client Example
 info.app.version=1.0.0

 server.servlet.context-path=/springboot-crud-rest

这里我的用户名和密码是正确的。如何配置我的网址？

此外，我还在 pom.xml 文件中添加了所需的依赖项。

<?xml version="1.0" encoding="UTF-8"?>

http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4.0.0

<groupId>net.guides.springboot2</groupId>
<artifactId>springboot2-jpa-crud-example</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>springboot2-jpa-crud-example</name>
<description>Demo project for Spring Boot</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.5.RELEASE</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-data-jpa</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-actuator</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
       <scope>runtime</scope>
   </dependency>
    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

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


 </project>

错误:

请帮助我缺少什么？

Answer 1

我相信您缺少属性 spring.datasource.driverClassName 或 spring.datasource.dataSourceClassName。您需要将其设置为 Hikari 的实现。还值得检查驱动程序是否存在于您的类路径中。我在你的 Maven 依赖项列表中没有看到它。

<dependency>
    <groupId>com.zaxxer</groupId>
    <artifactId>HikariCP</artifactId>
    <version>3.4.5</version>
</dependency>