无法使用 Spring Boot 和 JPA 在数据库中创建 table

Question

当我使用 Spring 引导应用程序和 JPA 在名为 schooldb 的数据库中创建 table 时，代码运行正常，但我无法自动创建 table 并且必须在 IDE.

中使用 CMD 或任何其他终端显式创建它

这是我的存储库class

package com.jpabasics.jpaBasics.enitity;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class Student {

    @Id
     private long studentId;
     private String firstName;
     private String lastName;
     private String emailId;
     private String guardianName;
     private String guardianEmail;
     private String guardianMobile;


}

这是我的 POM.xml 文件

<?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>2.6.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.jpabasics</groupId>
    <artifactId>jpaBasics</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>jpaBasics</name>
    <description>Jpa basics</description>
    <properties>
        <java.version>11</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>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </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>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

这也是我的 application.properties 文件

# Database Config : mysql
spring.datasource.url = jdbc:mysql://localhost:3306/schooldb
spring.datasource.username = root
spring.datasource.password = Lko@6388895330
spring.datasource.driver-class-name = com.mysql.cj.jdbc.Driver

# Hibernate Configuration
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl.auto = update
spring.jpa.show-sql = true
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL8Dialect

有人可以帮我解决这个问题吗？

Answer 1

您缺少在数据库中构建 table 以托管实体所需的 @table 注释。此外，注释您的列也是一个很好的习惯，以确保它们被正确命名（尽管在您的情况下，它们会被正确解析）。例如：

package com.jpabasics.jpaBasics.enitity;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
@Table(name="STUDENTS")
@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class Student {

     @Id
     @GeneratedValue(strategy = GenerationType.AUTO)
     @Column(name = "STUDENT_ID")
     private long studentId;

     @Column(name = "FIRST_NAME")
     private String firstName;

     @Column(name = "LAST_NAME")
     private String lastName;

     @Column(name = "EMAIL_ID")
     private String emailId;

     @Column(name = "GUARDIAN_NAME")
     private String guardianName;

     @Column(name = "GUARDIAN_EMAIL")
     private String guardianEmail;

     @Column(name = "GUARDIAN_MOBILE")
     private String guardianMobile;

}

无法使用 Spring Boot 和 JPA 在数据库中创建 table

Unable to create table in database using Spring Boot and JPA

java

hibernate

jpa

lombok

spring-boot