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  1. 04.04.10 00:08 #1
    flashray flashray ist offline Mitglied Rubin
    Registriert seit
    Sep 2005
    Ort
    Mannheim
    Beiträge
    1.325
    Hallo,

    ich habe für ein kleines GAE-GWT Projekt ein einfaches Datenmodell entworfen und dies versucht mit JPA umzusetzen. Ist das so im großen und ganzen ok?

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    import java.util.Date;
import java.util.List;
 
import javax.persistence.*;
 
import com.google.appengine.api.datastore.Key;
 
@Entity
public class Context {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Key key;
 
    private String label;
 
    private String description;
 
    private Date dateAdded;
 
    @OneToMany(cascade = CascadeType.ALL)
    private List<Category> categories;
 
    public Context() {
    }
 
    public Key getKey() {
        return key;
    }
 
    public String getLabel() {
        return label;
    }
 
    public void setLabel(String label) {
        this.label = label;
    }
 
    public Date getDateAdded() {
        return dateAdded;
    }
 
    public void setDateAdded(Date dateAdded) {
        this.dateAdded = dateAdded;
    }
 
    public void setDescription(String description) {
        this.description = description;
    }
 
    public String getDescription() {
        return description;
    }
 
    public void setCategories(List<Category> categories) {
        this.categories = categories;
    }
 
    public List<Category> getCategories() {
        return categories;
    }
}

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    import java.util.List;
 
import javax.persistence.*;
 
import com.google.appengine.api.datastore.Key;
 
@Entity
public class Category {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Key key;
 
    private String label;
 
    private String description;
    
    private Context context;
 
    @OneToMany(cascade=CascadeType.ALL)
    private List<SubCategory> subcategories;
    
    public Category() {
    }
 
    public Key getKey() {
        return key;
    }
 
    public String getLabel() {
        return label;
    }
 
    public void setLabel(String label) {
        this.label = label;
    }
 
    public void setDescription(String description) {
        this.description = description;
    }
 
    public String getDescription() {
        return description;
    }
 
    public void setSubcategories(List<SubCategory> subcategories) {
        this.subcategories = subcategories;
    }
 
    public List<SubCategory> getSubcategories() {
        return subcategories;
    }
 
    public void setContext(Context context) {
        this.context = context;
    }
 
    public Context getContext() {
        return context;
    }
}

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    import javax.persistence.*;
 
import com.google.appengine.api.datastore.Key;
 
@Entity
public class SubCategory {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Key key;
 
    private String label;
 
    private String description;
    
    private Category category;
    
    public SubCategory() {
    }
 
    public Key getKey() {
        return key;
    }
 
    public String getLabel() {
        return label;
    }
 
    public void setLabel(String label) {
        this.label = label;
    }
 
    public void setDescription(String description) {
        this.description = description;
    }
 
    public String getDescription() {
        return description;
    }
 
    public Category getCategory() {
        return category;
    }
 
    public void setCategory(Category category) {
        this.category = category;
    }
}

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    import java.util.Date;
 
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
 
import com.google.appengine.api.datastore.Key;
 
@Entity
public class Link {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Key key;
 
    private String label;
 
    private String url;
    
    private String description;
 
    private Date dateAdded;
 
    public Link() {
    }
    
    public Key getKey() {
        return key;
    }
 
    public String getLabel() {
        return label;
    }
 
    public void setLabel(String label) {
        this.label = label;
    }
 
    public String getUrl() {
        return url;
    }
 
    public void setUrl(String url) {
        this.url = url;
    }
 
    public Date getDateAdded() {
        return dateAdded;
    }
 
    public void setDateAdded(Date dateAdded) {
        this.dateAdded = dateAdded;
    }
 
    public void setDescription(String description) {
        this.description = description;
    }
 
    public String getDescription() {
        return description;
    } 
}

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    import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
 
import com.google.appengine.api.datastore.Key;
 
@Entity
public class MetaData {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Key key;
 
    private long hits;
 
    private double rating;
 
    private long ratingCount;
 
    private Link link;
    
    private Context context;
    
    public MetaData() {
    }
 
    public Key getKey() {
        return key;
    }
 
    public long getHits() {
        return hits;
    }
 
    public void setHits(long hits) {
        this.hits = hits;
    }
 
    public double getRating() {
        return rating;
    }
 
    public void setRating(double rating) {
        this.rating = rating;
    }
 
    public long getRatingCount() {
        return ratingCount;
    }
 
    public void setRatingCount(long ratingCount) {
        this.ratingCount = ratingCount;
    }
 
    public void setLink(Link link) {
        this.link = link;
    }
 
    public Link getLink() {
        return link;
    }
 
    public void setContext(Context context) {
        this.context = context;
    }
 
    public Context getContext() {
        return context;
    }
 
}

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    import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
 
import com.google.appengine.api.datastore.Key;
 
@Entity
public class Mapping {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Key key;
    
    private Link link;
    
    private SubCategory subcategory;
 
    public Mapping() {
    }
    
    public Key getKey() {
        return key;
    }
 
    public Link getLink() {
        return link;
    }
 
    public void setLink(Link link) {
        this.link = link;
    }
 
    public SubCategory getSubcategory() {
        return subcategory;
    }
 
    public void setSubcategory(SubCategory subcategory) {
        this.subcategory = subcategory;
    }
}
    Miniaturansicht angehängter Grafiken Miniaturansicht angehängter Grafiken JPA-datenmodell.png  
     
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