JCH
Java Community | Help. Code. Learn.•7mo ago
Danix

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
JavaBot•7mo ago
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Hey @Danix! Please use /close or the Close Post button above when your problem is solved. Please remember to follow the help guidelines. This post will be automatically closed after 300 minutes of inactivity.
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dan1st
dan1st•7mo 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
Danix
DanixOP•7mo ago
These are methods right so what to do with them ?
dan1st
dan1st•7mo 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
JavaBot•7mo ago
💤 Post marked as dormant
This post has been inactive for over 300 minutes, thus, it has been archived. If your question was not answered yet, feel free to re-open this post or create a new one. In case your post is not getting any attention, you can try to use /help ping. Warning: abusing this will result in moderative actions taken against you.
Danix
DanixOP•7mo 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
dan1st•7mo ago
It depends. DTOs can even be useful with forms
JavaBot
JavaBot•7mo ago
💤 Post marked as dormant
This post has been inactive for over 300 minutes, thus, it has been archived. If your question was not answered yet, feel free to re-open this post or create a new one. In case your post is not getting any attention, you can try to use /help ping. Warning: abusing this will result in moderative actions taken against you.

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