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我正在使用 postgresql 和 spring data jpa 运行 spring boot crud rest api。

应用程序启动正常，但我没有执行任何 SQL - 没有创建表，并且在控制台上没有显示任何错误。这是我的 pom.xml 、存储库、应用程序属性和实体文件。

Pom.xml 文件

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.4.2</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>rest-api-sql</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>rest-api-sql</name>
<description>Demo project for Spring Boot</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>org.postgresql</groupId>
        <artifactId>postgresql</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>

EmployeeRepository.java

  @Repository
  public interface EmployeeRepository extends JpaRepository<Employee, Long>{}

雇员.java

@Entity
@Table(name = "Employee")
public class Employee {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id", unique = true)
private long id;

@Column(name = "firstname")
private String firstname;
@Column(name = "lastname")
private String lastname;
@Column(name = "email")
private String email;

public Employee() {
    super();
    // TODO Auto-generated constructor stub
}

public Employee(int id, String firstname, String lastname) {
    super();
    this.id = id;
    this.firstname = firstname;
    this.lastname = lastname;
}

public long getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getFirstname() {
    return firstname;
}

public void setFirstname(String firstname) {
    this.firstname = firstname;
}

public String getLastname() {
    return lastname;
}

public void setLastname(String lastname) {
    this.lastname = lastname;
}

public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

}

Application.properties 文件

spring.datasource.url=jdbc:postgresql://localhost:5432/rest-api-sql
spring.datasource.username=postgres
spring.datasource.password=admin
spring.jpa.show-sql=true

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

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