启动 Spring Boot 应用程序后未在 MySql DB 中创建表

Question

该项目使用数据库MySql，Open Server。这是我的 application.properties 文件：

spring.jpa.hibernate.ddl-auto=update
spring.datasource.url=jdbc:mysql://${MYSQL_HOST:localhost}:8888/citatnik_bd
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
#spring.jpa.show-sql: true

这是我的实体：

import javax.persistence.*;

@Entity
@Table(name="Quotes")
public class Quotes {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long ID;

    private String ru, by, ua, en;

    public Long GetID() { return ID; }
    public void SetID(Long ID) { this.ID = ID; }

    public String GetBy() { return by; }
    public void SetBy(String by) { this.by = by; }

    public String GetRu() { return ru; }
    public void SetRu(String ru) { this.ru = ru; }

    public String GetUa() { return ua; }
    public void SetUa(String ua) { this.ua = ua; }

    public String GetEn() { return en; }
    public void SetEn(String en) { this.by = en; }
}

顺便说一下，pom.xml 文件中一切都很好，所有必要的依赖项都已注册：

<?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>3.1.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.Citatnik</groupId>
    <artifactId>Citatnik</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>Citatnik</name>
    <description>Citatnik project</description>
    <properties>
        <java.version>17</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</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-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
            <version>8.0.30</version>
        </dependency>
        <dependency>
            <groupId>javax.persistence</groupId>
            <artifactId>javax.persistence-api</artifactId>
            <version>2.2</version>
        </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-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>


</project>

这是从 Spring 应用程序注销：

 :: Spring Boot ::                (v3.1.2)

2023-07-31T19:01:34.457+03:00  INFO 3336 --- [  restartedMain] c.Citatnik.Citatnik.CitatnikApplication  : Starting CitatnikApplication using Java 17.0.6 with PID 3336 (C:\Users\dddry\OneDrive\Рабочий стол\Цитатник\Citatnik\target\classes started by dddry in C:\Users\dddry\OneDrive\Рабочий стол\Цитатник\Citatnik)
2023-07-31T19:01:34.461+03:00  INFO 3336 --- [  restartedMain] c.Citatnik.Citatnik.CitatnikApplication  : No active profile set, falling back to 1 default profile: "default"
2023-07-31T19:01:34.539+03:00  INFO 3336 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2023-07-31T19:01:34.539+03:00  INFO 3336 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2023-07-31T19:01:35.213+03:00  INFO 3336 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2023-07-31T19:01:35.232+03:00  INFO 3336 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 11 ms. Found 0 JPA repository interfaces.
2023-07-31T19:01:35.866+03:00  INFO 3336 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2023-07-31T19:01:35.876+03:00  INFO 3336 --- [  restartedMain] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2023-07-31T19:01:35.876+03:00  INFO 3336 --- [  restartedMain] o.apache.catalina.core.StandardEngine    : Starting Servlet engine: [Apache Tomcat/10.1.11]
2023-07-31T19:01:35.945+03:00  INFO 3336 --- [  restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2023-07-31T19:01:35.946+03:00  INFO 3336 --- [  restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1405 ms
2023-07-31T19:01:36.094+03:00  INFO 3336 --- [  restartedMain] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [name: default]
2023-07-31T19:01:36.148+03:00  INFO 3336 --- [  restartedMain] org.hibernate.Version                    : HHH000412: Hibernate ORM core version 6.2.6.Final
2023-07-31T19:01:36.149+03:00  INFO 3336 --- [  restartedMain] org.hibernate.cfg.Environment            : HHH000406: Using bytecode reflection optimizer
2023-07-31T19:01:36.272+03:00  INFO 3336 --- [  restartedMain] o.h.b.i.BytecodeProviderInitiator        : HHH000021: Bytecode provider name : bytebuddy
2023-07-31T19:01:36.396+03:00  INFO 3336 --- [  restartedMain] o.s.o.j.p.SpringPersistenceUnitInfo      : No LoadTimeWeaver setup: ignoring JPA class transformer
2023-07-31T19:01:36.409+03:00  INFO 3336 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2023-07-31T19:01:36.664+03:00  INFO 3336 --- [  restartedMain] com.zaxxer.hikari.pool.HikariPool        : HikariPool-1 - Added connection com.mysql.cj.jdbc.ConnectionImpl@41c02a96
2023-07-31T19:01:36.666+03:00  INFO 3336 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
2023-07-31T19:01:36.824+03:00  INFO 3336 --- [  restartedMain] o.h.b.i.BytecodeProviderInitiator        : HHH000021: Bytecode provider name : bytebuddy
2023-07-31T19:01:37.044+03:00  INFO 3336 --- [  restartedMain] o.h.e.t.j.p.i.JtaPlatformInitiator       : HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
2023-07-31T19:01:37.048+03:00  INFO 3336 --- [  restartedMain] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2023-07-31T19:01:37.094+03:00  WARN 3336 --- [  restartedMain] JpaBaseConfiguration$JpaWebConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2023-07-31T19:01:37.542+03:00  INFO 3336 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729
2023-07-31T19:01:37.574+03:00  INFO 3336 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2023-07-31T19:01:37.585+03:00  INFO 3336 --- [  restartedMain] c.Citatnik.Citatnik.CitatnikApplication  : Started CitatnikApplication in 3.679 seconds (process running for 4.084)

我检查了端口、数据库名称、用户名和密码 - 一切都正确。但是，当我运行应用程序并转到 phpMyAdmin 时，我看到一条消息，指出数据库中未找到表。这里可能有什么问题？

Answer 1

您正在使用 spring-boot 3.1.2，这意味着您应该更换您的

import javax.persistence.*;

与

import jakarta.persistence.*;

关于你的 Maven 依赖，你应该删除这个

<dependency>
        <groupId>javax.persistence</groupId>
        <artifactId>javax.persistence-api</artifactId>
        <version>2.2</version>
    </dependency>

因为你使用

spring-boot-starter-data-jpa

它依赖于 Hibernate。然后，Hibernate 依赖于 jakarta.persistence API，这使其类可用于您的应用程序代码。

关于您的问题，应用程序启动后您看不到表格。 只需尝试替换应用程序属性参数

spring.jpa.hibernate.ddl-auto=create

首次运行应用程序后

替换为

update