Java Community | Help. Code. Learn.•5mo ago

DTO

Can anyone help me to create DTO for this classes and also explain me why we use DTO more

package com.ShelfSpace.ShelfSpace.model;

import java.util.List;

import jakarta.persistence.Column;
import jakarta.persistence.Entity;
import jakarta.persistence.Id;
import jakarta.persistence.JoinTable;
import jakarta.persistence.ManyToMany;
import jakarta.persistence.Table;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import jakarta.persistence.JoinColumn;

@Entity
@Table(name = "registered_user")
@Data
@AllArgsConstructor
@NoArgsConstructor
public class UserEntity {

    
    @Column(name = "name", nullable = false)
    private String name;
    
    @Id
    @Column(name = "email", nullable = false, unique = true)
    private String email;
    
    
    @Column(name = "password", nullable = false)
    private String password;

    @ManyToMany
     @JoinTable(
                name = "user_info_user_roles",
                joinColumns = @JoinColumn(name = "user_info_email", referencedColumnName = "email"),
                inverseJoinColumns = @JoinColumn(name = "user_roles_id")
            )
    private List<UserRoleEntity> roles;

}

package com.ShelfSpace.ShelfSpace.model;

import java.util.List;

import jakarta.persistence.Column;
import jakarta.persistence.Entity;
import jakarta.persistence.Id;
import jakarta.persistence.JoinTable;
import jakarta.persistence.ManyToMany;
import jakarta.persistence.Table;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import jakarta.persistence.JoinColumn;

@Entity
@Table(name = "registered_user")
@Data
@AllArgsConstructor
@NoArgsConstructor
public class UserEntity {

    
    @Column(name = "name", nullable = false)
    private String name;
    
    @Id
    @Column(name = "email", nullable = false, unique = true)
    private String email;
    
    
    @Column(name = "password", nullable = false)
    private String password;

    @ManyToMany
     @JoinTable(
                name = "user_info_user_roles",
                joinColumns = @JoinColumn(name = "user_info_email", referencedColumnName = "email"),
                inverseJoinColumns = @JoinColumn(name = "user_roles_id")
            )
    private List<UserRoleEntity> roles;

}

package com.ShelfSpace.ShelfSpace.model;

import java.util.List;

import jakarta.persistence.Column;
import jakarta.persistence.Entity;
import jakarta.persistence.Id;
import jakarta.persistence.ManyToMany;
import jakarta.persistence.Table;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Entity
@Table(name = "user_roles")
@Data
@NoArgsConstructor
@AllArgsConstructor
public class UserRoleEntity {

    @Id
    @Column(name = "role_id")
    private int roleId;
    
     @Column(name = "role_name", nullable = false, unique = true)
    private String roleName;

     @ManyToMany(mappedBy = "roles")
    private List<UserEntity> registeredUser;
}

package com.ShelfSpace.ShelfSpace.model;

import java.util.List;

import jakarta.persistence.Column;
import jakarta.persistence.Entity;
import jakarta.persistence.Id;
import jakarta.persistence.ManyToMany;
import jakarta.persistence.Table;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Entity
@Table(name = "user_roles")
@Data
@NoArgsConstructor
@AllArgsConstructor
public class UserRoleEntity {

    @Id
    @Column(name = "role_id")
    private int roleId;
    
     @Column(name = "role_name", nullable = false, unique = true)
    private String roleName;

     @ManyToMany(mappedBy = "roles")
    private List<UserEntity> registeredUser;
}

8 Replies

JavaBot•5mo ago

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dan1st•5mo ago

Assuming you are using a recent Java and Spring version, you can just use records as DTOs:

public record UserDTO(Stromg name, String email, List<UserRoleDTO> roles){}
public record UserRoleDTO(int roleId, String roleName){}

public record UserDTO(Stromg name, String email, List<UserRoleDTO> roles){}
public record UserRoleDTO(int roleId, String roleName){}

Like these would be the DTO classes

DanixOP•5mo ago

These are methods right so what to do with them ?

dan1st•5mo ago

classes If you want to (de)serialize your dara from/to JSON, you would use DTOs that allows you to have a JSON data format that deviates from your internal storage

JavaBot•5mo ago

💤 Post marked as dormant

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DanixOP•5mo ago

Ok so I have to use DTO when I have to convert my entities to json format right but if I have to register the user from a form then should I have to use a DTO or make it simple ?

dan1st•5mo ago

It depends. DTOs can even be useful with forms

JavaBot•5mo ago

💤 Post marked as dormant

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