使用spring boot jpa不会自动创建mysql数据库

Question

我使用spring boot和jpa来自动创建表，但是由于某些原因，当我启动应用程序时，表并没有被创建。

这是我的application.properties：

    #Mysql Config
spring.datasource.url=jdbc:mysql://localhost:3306/election?useTimezone=true&serverTimezone=UTC&createDatabaseIfNotExist=true
spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true
spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
spring.jpa.database-platform=org.hibernate.dialect.MySQL8Dialect
spring.datasource.username=root
spring.datasource.password=root
spring.jpa.hibernate.ddl-auto=create

这是我的应用程序中的一个模型示例。

​

和我的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 https://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>2.3.0.M3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.dataprev.election</groupId>
    <artifactId>election</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>election</name>
    <description>Demo System Election</description>

    <properties>
        <java.version>13</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-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

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

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </pluginRepository>
    </pluginRepositories>

</project>

我也已经连接到intellij的数据库了。我看到了其他类似的问题，但没有解决我的问题。

Answer 1

可能是dialect.Change您的hibernate方言属性有问题，然后重试，

 spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL57Dialect

Answer 2

您可以通过在MySQL连接中启用SSL来实现此目的。

spring.datasource.url=jdbc:mysql://localhost/my_db?useSSL=true&createDatabaseIfNotExist=true
spring.jpa.database-platform=org.hibernate.dialect.MySQLDialect
spring.datasource.username=james
spring.datasource.password=bond
spring.jpa.hibernate.ddl-auto=create
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect

但是要小心使用DDL命令，尝试单独管理数据库模式。它会让你更好地控制你的应用程序。