Enregistrer l'arborescence d'objets personnalisés dans la base de données à l'aide d'ORM Lite

Question

J'ai l'objet Guild.class et GuildMember.class. J'ai besoin de stocker ArrayList de GuildMembers dans Guild et les traiter à la base de données en utilisant ORM Lite. Dans le code exemple que j'ai trouvé l'annotation ForeignCollectionField mais il ne semble pas fonctionner correctement

Guild.java

package skymine.redenergy.clansreloaded.server.entities; 

import java.util.ArrayList; 
import java.util.Collection; 
import java.util.UUID; 

import com.j256.ormlite.dao.ForeignCollection; 
import com.j256.ormlite.field.DatabaseField; 
import com.j256.ormlite.field.ForeignCollectionField; 
import com.j256.ormlite.table.DatabaseTable; 

@DatabaseTable(tableName = "guilds") 
public class Guild { 

    @DatabaseField(id = true) 
    private UUID uid; 

    @DatabaseField(canBeNull = false) 
    private String title; 

    @ForeignCollectionField 
    public Collection<GuildMember> players; 

    public Guild(){} 

    public Guild(String title){ 
     this.title = title; 
     this.uid = UUID.randomUUID(); 
     this.players = new ArrayList<GuildMember>(); 
    } 

    public Collection<GuildMember> getPlayers(){ 
     return players; 
    } 

    public void addPlayer(GuildMember player){ 
     this.players.add(player); 
    } 

    public String getTitle(){ 
     return title; 
    } 

    public Guild setTitle(String newTitle){ 
     this.title = newTitle; 
     return this; 
    } 

    public UUID getUUID(){ 
     return uid; 
    } 
} 

GuildMember.java

package skymine.redenergy.clansreloaded.server.entities; 

import java.util.UUID; 

import com.j256.ormlite.field.DatabaseField; 
import com.j256.ormlite.table.DatabaseTable; 

@DatabaseTable(tableName = "members") 
public class GuildMember { 

    @DatabaseField(id = true) 
    private UUID uid; 

    @DatabaseField(canBeNull = false) 
    private String name; 

    @DatabaseField 
    private int rank; 

    public GuildMember(){} 

    public GuildMember(String name, int rank){ 
     this.name = name; 
     this.rank = rank; 
     this.uid = UUID.randomUUID(); 
    } 

    public String getName(){ 
     return name; 
    } 

    public int getRank(){ 
     return rank; 
    } 

    public UUID getUUID(){ 
     return uid; 
    } 

    public GuildMember setRank(int newRank){ 
     this.rank = newRank; 
     return this; 
    } 
} 

En conséquence, je reçois

java.sql.SQLException: Foreign collection class skymine.redenergy.clansreloaded.server.entities.GuildMember for field 'players' column-name does not contain a foreign field of class skymine.redenergy.clansreloaded.server.entities.Guild 
    at com.j256.ormlite.field.FieldType.findForeignFieldType(FieldType.java:1020) 
    at com.j256.ormlite.field.FieldType.configDaoInformation(FieldType.java:390) 
    at com.j256.ormlite.dao.BaseDaoImpl.initialize(BaseDaoImpl.java:201) 
    at com.j256.ormlite.dao.BaseDaoImpl.<init>(BaseDaoImpl.java:128) 
    at com.j256.ormlite.dao.BaseDaoImpl.<init>(BaseDaoImpl.java:107) 
    at com.j256.ormlite.dao.BaseDaoImpl$4.<init>(BaseDaoImpl.java:907) 
    at com.j256.ormlite.dao.BaseDaoImpl.createDao(BaseDaoImpl.java:907) 
    at com.j256.ormlite.dao.DaoManager.createDao(DaoManager.java:70) 
    at skymine.redenergy.clansreloaded.server.ClanManager.initDatabase(ClanManager.java:23) 
    at skymine.redenergy.clansreloaded.ClanManagerTest.<init>(ClanManagerTest.java:36) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) 
    at java.lang.reflect.Constructor.newInstance(Unknown Source) 
    at org.junit.runners.BlockJUnit4ClassRunner.createTest(BlockJUnit4ClassRunner.java:217) 
    at org.junit.runners.BlockJUnit4ClassRunner$1.runReflectiveCall(BlockJUnit4ClassRunner.java:266) 
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) 
    at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:263) 
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) 
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) 
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) 
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) 
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) 
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) 
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) 
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363) 
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) 
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192) 

Answer 1

espoir - cela va vous aider: https://github.com/j256/ormlite-jdbc/tree/master/src/test/java/com/j256/ormlite/examples/foreignCollection

Regardez Readme et vérifiez ordre de classe avec son paramètre étranger, à savoir .:

@DatabaseField(foreign = true, foreignAutoRefresh = true, columnName = ACCOUNT_ID_FIELD_NAME) 
    private Account account; 

... semble être votre cas