mysql创建实体类

CREATE TABLE User (
    id INT PRIMARY KEY AUTO_INCREMENT,
    username VARCHAR(50) NOT NULL,
    email VARCHAR(100) NOT NULL,
    age INT
);

public class User {
    private int id;
    private String username;
    private String email;
    private int age;

    // Getters and Setters
    public int getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getEmail() {
        return email;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "User")
public class User {
    @Id
    private int id;

    @Column(name = "username", length = 50)
    private String username;

    @Column(name = "email", length = 100)
    private String email;

    @Column(name = "age")
    private int age;

    // Getters and Setters
}

<property name="hbm2ddl.auto">create</property>

spring.jpa.hibernate.ddl-auto=create