1. 홈
  2. 질의 응답
  3. Android 용 OrmLite를 사용한 복합 패턴

Android 용 OrmLite를 사용한 복합 패턴

2011-11-23 2 views
0

Android 용 앱을 프로그래밍하고 데이터베이스에 ormLite를 사용하고 있습니다.Android 용 OrmLite를 사용한 복합 패턴

일부 DB 항목에는 Composite Pattern을 사용하고 싶습니다.

는 다음 코드 작성 :

식품

package com.android.droidfridge.data; 

import com.j256.ormlite.field.DatabaseField; 

public abstract class Foodstuff 
{ 
    @DatabaseField(id = true, useGetSet = true) 
    private String name; 

    @DatabaseField(useGetSet = true, foreign = true) 
    private Category category; 

    @DatabaseField(useGetSet = true) 
    private int image; 

    public String getName() 
    { 
     return name; 
    } 

    public void setName(String name) 
    { 
     this.name = name; 
    } 

    public Category getCategory() 
    { 
     return category; 
    } 

    public void setCategory(Category category) 
    { 
     this.category = category; 
    } 

    public int getImage() 
    { 
     return image; 
    } 

    public void setImage(int image) 
    { 
     this.image = image; 
    } 
}

성분

package com.android.droidfridge.data; 

import java.io.Serializable; 

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

@DatabaseTable(tableName = "ingredients") 
public class Ingredient extends Foodstuff implements Serializable 
{ 
    private static final long serialVersionUID = 5798705059641377421L; 

    @DatabaseField(useGetSet = true) 
    private int amount; 

    @DatabaseField(useGetSet = true) 
    private int defaultAmount; 

    @DatabaseField(useGetSet = true) 
    private float price; 

    @DatabaseField(useGetSet = true) 
    private BaseUnit unit; 

    public float getPrice() 
    { 
     return price; 
    } 

    public void setPrice(float price) 
    { 
     this.price = price; 
    } 

    public BaseUnit getUnit() 
    { 
     return unit; 
    } 

    public void setUnit(BaseUnit unit) 
    { 
     this.unit = unit; 
    } 

    public int getDefaultAmount() 
    { 
     return defaultAmount; 
    } 

    public void setDefaultAmount(int defaultAmount) 
    { 
     this.defaultAmount = defaultAmount; 
    } 

    public int getAmount() 
    { 
     return amount; 
    } 

    public void setAmount(int amount) 
    { 
     this.amount = amount; 
    } 

    public void add(int additional) 
    { 
     this.amount += additional; 
    } 

    public void add_default_amount() 
    { 
     this.add(this.defaultAmount); 
    } 
}

레시피를

package com.android.droidfridge.data; 

import java.io.Serializable; 
import java.util.Collection; 
import java.util.Iterator; 

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

@DatabaseTable(tableName = "recipes") 
public class Recipe extends Foodstuff implements Serializable 
{ 
    private static final long serialVersionUID = 635229962897104194L; 

    @DatabaseField(useGetSet = true) 
    private int duration; 

    @ForeignCollectionField(eager = true) 
    private Collection<Foodstuff> ingredients; 

    public int getDuration() 
    { 
     return duration; 
    } 

    public void setDuration(int duration) 
    { 
     this.duration = duration; 
    } 

    public Collection<Foodstuff> getIngredients() 
    { 
     return ingredients; 
    } 

    public void setIngredients(Collection<Foodstuff> ingredients) { 
     this.ingredients = ingredients; 
    } 

    public Foodstuff getIngredient(Foodstuff ingredient) 
    { 
     if(ingredients.contains(ingredient)) 
     { 
      Iterator<Foodstuff> iterator = ingredients.iterator(); 
      boolean check = true; 
      while(check) 
      { 
       if(iterator.equals(ingredient)) 
        return (Foodstuff) iterator; 

       if(iterator.hasNext()) 
        iterator.next(); 
       else 
        check = false; 
      } 
     } 

     return null; 
    } 

    public void addIngredient(Ingredient ingredient) 
    { 
     ingredients.add(ingredient); 
    } 

    public void removeIngredient(Foodstuff ingredient) 
    { 
     ingredients.remove(ingredient); 
    } 

    public int sizeOfIngredients() 
    { 
     return ingredients.size(); 
    } 
}

카테고리 package com.android.droidfridge.data;

import java.io.Serializable; 

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

@DatabaseTable(tableName = "categories") 
public class Category implements Serializable 
{ 
private static final long serialVersionUID = -2222256865380949570L; 

@DatabaseField(id = true, useGetSet = true) 
private String name; 

public String getName() 
{ 
    return name; 
} 

public void setName(String name) 
{ 
    this.name = name; 
} 
}

식품 재료 또는 조리법이 될 수 있습니다. 조리법은 재료 또는 다른 조리법입니다. 각 성분 및 제조법에는 카테고리가 있습니다.

각 카테고리, 성분 및 제조법을 저장합니다.

11-23 21:50:16.493: I/TableUtils(261): creating table 'ingredients' 
11-23 21:50:16.513: I/TableUtils(261): executed create table statement changed 1 rows: CREATE TABLE `ingredients` (`unit` VARCHAR , `defaultAmount` INTEGER , `price` FLOAT , `amount` INTEGER , `category_id` VARCHAR , `name` VARCHAR , `image` INTEGER , PRIMARY KEY (`name`)) 
11-23 21:50:16.603: D/dalvikvm(261): GC_FOR_MALLOC freed 8647 objects/515488 bytes in 44ms 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261): Unable to create databases, sorry dude! 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261): java.sql.SQLException: Foreign collection object class com.android.droidfridge.data.Foodstuff for field 'ingredients' does not contain a foreign field of class class com.android.droidfridge.data.Recipe 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.j256.ormlite.field.FieldType.configDaoInformation(FieldType.java:345) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.j256.ormlite.dao.BaseDaoImpl.initialize(BaseDaoImpl.java:171) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.j256.ormlite.dao.BaseDaoImpl.<init>(BaseDaoImpl.java:118) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.j256.ormlite.dao.BaseDaoImpl.<init>(BaseDaoImpl.java:97) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.j256.ormlite.dao.BaseDaoImpl$3.<init>(BaseDaoImpl.java:782) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.j256.ormlite.dao.BaseDaoImpl.createDao(BaseDaoImpl.java:782) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.j256.ormlite.dao.DaoManager.createDao(DaoManager.java:74) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.j256.ormlite.table.TableUtils.createTable(TableUtils.java:218) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.j256.ormlite.table.TableUtils.createTable(TableUtils.java:53) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.android.droidfridge.data.DatabaseHelper.onCreate(DatabaseHelper.java:35) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.j256.ormlite.android.apptools.OrmLiteSqliteOpenHelper.onCreate(OrmLiteSqliteOpenHelper.java:168) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:106) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.j256.ormlite.android.AndroidConnectionSource.getReadWriteConnection(AndroidConnectionSource.java:60) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.j256.ormlite.dao.BaseDaoImpl.create(BaseDaoImpl.java:286) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.android.droidfridge.ListActivity.createIngredient(ListActivity.java:88) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.android.droidfridge.ListActivity.onCreate(ListActivity.java:45) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at android.app.ActivityThread.startActivityNow(ActivityThread.java:2503) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:651) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at android.widget.TabHost.setCurrentTab(TabHost.java:323) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:129) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:453) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at android.view.View.performClick(View.java:2408) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at android.view.View$PerformClick.run(View.java:8816) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at android.os.Handler.handleCallback(Handler.java:587) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at android.os.Handler.dispatchMessage(Handler.java:92) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at android.os.Looper.loop(Looper.java:123) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at java.lang.reflect.Method.invokeNative(Native Method) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at java.lang.reflect.Method.invoke(Method.java:521) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
11-23 21:50:16.663: E/com.android.droidfridge.data.DatabaseHelper(261):  at dalvik.system.NativeStart.main(Native Method) 
11-23 21:50:16.843: I/Database(261): sqlite returned: error code = 1, msg = no such table: categories 
11-23 21:50:16.843: W/System.err(261): java.sql.SQLException: Unable to run insert stmt on object [email protected]: INSERT INTO `categories` (`name`) VALUES (?) 
11-23 21:50:16.853: W/System.err(261): at com.j256.ormlite.misc.SqlExceptionUtil.create(SqlExceptionUtil.java:22) 
11-23 21:50:16.853: W/System.err(261): at com.j256.ormlite.stmt.mapped.MappedCreate.insert(MappedCreate.java:117) 
11-23 21:50:16.853: W/System.err(261): at com.j256.ormlite.stmt.StatementExecutor.create(StatementExecutor.java:341) 
11-23 21:50:16.853: W/System.err(261): at com.j256.ormlite.dao.BaseDaoImpl.create(BaseDaoImpl.java:288) 
11-23 21:50:16.853: W/System.err(261): at com.android.droidfridge.ListActivity.createIngredient(ListActivity.java:88) 
11-23 21:50:16.853: W/System.err(261): at com.android.droidfridge.ListActivity.onCreate(ListActivity.java:45) 
11-23 21:50:16.853: W/System.err(261): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
11-23 21:50:16.853: W/System.err(261): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
11-23 21:50:16.853: W/System.err(261): at android.app.ActivityThread.startActivityNow(ActivityThread.java:2503) 
11-23 21:50:16.853: W/System.err(261): at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127) 
11-23 21:50:16.863: W/System.err(261): at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339) 
11-23 21:50:16.863: W/System.err(261): at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:651) 
11-23 21:50:16.863: W/System.err(261): at android.widget.TabHost.setCurrentTab(TabHost.java:323) 
11-23 21:50:16.863: W/System.err(261): at android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:129) 
11-23 21:50:16.863: W/System.err(261): at android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:453) 
11-23 21:50:16.863: W/System.err(261): at android.view.View.performClick(View.java:2408) 
11-23 21:50:16.863: W/System.err(261): at android.view.View$PerformClick.run(View.java:8816) 
11-23 21:50:16.863: W/System.err(261): at android.os.Handler.handleCallback(Handler.java:587) 
11-23 21:50:16.863: W/System.err(261): at android.os.Handler.dispatchMessage(Handler.java:92) 
11-23 21:50:16.863: W/System.err(261): at android.os.Looper.loop(Looper.java:123) 
11-23 21:50:16.863: W/System.err(261): at android.app.ActivityThread.main(ActivityThread.java:4627) 
11-23 21:50:16.863: W/System.err(261): at java.lang.reflect.Method.invokeNative(Native Method) 
11-23 21:50:16.873: W/System.err(261): at java.lang.reflect.Method.invoke(Method.java:521) 
11-23 21:50:16.873: W/System.err(261): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
11-23 21:50:16.873: W/System.err(261): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
11-23 21:50:16.873: W/System.err(261): at dalvik.system.NativeStart.main(Native Method) 
11-23 21:50:16.873: W/System.err(261): Caused by: java.sql.SQLException: inserting to database failed: INSERT INTO `categories` (`name`) VALUES (?) 
11-23 21:50:16.883: W/System.err(261): at com.j256.ormlite.misc.SqlExceptionUtil.create(SqlExceptionUtil.java:22) 
11-23 21:50:16.883: W/System.err(261): at com.j256.ormlite.android.AndroidDatabaseConnection.insert(AndroidDatabaseConnection.java:102) 
11-23 21:50:16.883: W/System.err(261): at com.j256.ormlite.stmt.mapped.MappedCreate.insert(MappedCreate.java:72) 
11-23 21:50:16.883: W/System.err(261): ... 24 more 
11-23 21:50:16.883: W/System.err(261): Caused by: android.database.sqlite.SQLiteException: no such table: categories: , while compiling: INSERT INTO `categories` (`name`) VALUES (?) 
11-23 21:50:16.893: W/System.err(261): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method) 
11-23 21:50:16.893: W/System.err(261): at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:91) 
11-23 21:50:16.893: W/System.err(261): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:64) 
11-23 21:50:16.893: W/System.err(261): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:80) 
11-23 21:50:16.903: W/System.err(261): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:36) 
11-23 21:50:16.903: W/System.err(261): at android.database.sqlite.SQLiteDatabase.compileStatement(SQLiteDatabase.java:1145) 
11-23 21:50:16.903: W/System.err(261): at com.j256.ormlite.android.AndroidDatabaseConnection.insert(AndroidDatabaseConnection.java:94) 
11-23 21:50:16.903: W/System.err(261): ... 25 more 
11-23 21:50:16.903: I/Database(261): sqlite returned: error code = 1, msg = no such table: categories 
11-23 21:50:16.903: I/Database(261): [ 11-23 21:50:17.044 261:0x105 I/java.sql.SQLException: queryForOne from database failed: SELECT * FROM `categories` WHERE `nObject Error 
11-23 21:50:17.044: I/Database(261): sqlite returned: error code = 1, msg = no such table: categories 
11-23 21:50:17.044: W/System.err(261): java.sql.SQLException: Unable to run insert stmt on object [email protected]: INSERT INTO `categories` (`name`) VALUES (?) 
11-23 21:50:17.053: W/System.err(261): at com.j256.ormlite.misc.SqlExceptionUtil.create(SqlExceptionUtil.java:22) 
11-23 21:50:17.053: W/System.err(261): at com.j256.ormlite.stmt.mapped.MappedCreate.insert(MappedCreate.java:117) 
11-23 21:50:17.053: W/System.err(261): at com.j256.ormlite.stmt.StatementExecutor.create(StatementExecutor.java:341) 
11-23 21:50:17.053: W/System.err(261): at com.j256.ormlite.dao.BaseDaoImpl.create(BaseDaoImpl.java:288) 
11-23 21:50:17.053: W/System.err(261): at com.android.droidfridge.ListActivity.createIngredient(ListActivity.java:88) 
11-23 21:50:17.053: W/System.err(261): at com.android.droidfridge.ListActivity.onCreate(ListActivity.java:46) 
11-23 21:50:17.053: W/System.err(261): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
11-23 21:50:17.053: W/System.err(261): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
11-23 21:50:17.053: W/System.err(261): at android.app.ActivityThread.startActivityNow(ActivityThread.java:2503) 
11-23 21:50:17.053: W/System.err(261): at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127) 
11-23 21:50:17.053: W/System.err(261): at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339) 
11-23 21:50:17.053: W/System.err(261): at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:651) 
11-23 21:50:17.053: W/System.err(261): at android.widget.TabHost.setCurrentTab(TabHost.java:323) 
11-23 21:50:17.053: W/System.err(261): at android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:129) 
11-23 21:50:17.053: W/System.err(261): at android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:453) 
11-23 21:50:17.053: W/System.err(261): at android.view.View.performClick(View.java:2408) 
11-23 21:50:17.053: W/System.err(261): at android.view.View$PerformClick.run(View.java:8816) 
11-23 21:50:17.053: W/System.err(261): at android.os.Handler.handleCallback(Handler.java:587) 
11-23 21:50:17.053: W/System.err(261): at android.os.Handler.dispatchMessage(Handler.java:92) 
11-23 21:50:17.053: W/System.err(261): at android.os.Looper.loop(Looper.java:123) 
11-23 21:50:17.053: W/System.err(261): at android.app.ActivityThread.main(ActivityThread.java:4627) 
11-23 21:50:17.053: W/System.err(261): at java.lang.reflect.Method.invokeNative(Native Method) 
11-23 21:50:17.053: W/System.err(261): at java.lang.reflect.Method.invoke(Method.java:521) 
11-23 21:50:17.053: W/System.err(261): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
11-23 21:50:17.053: W/System.err(261): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
11-23 21:50:17.053: W/System.err(261): at dalvik.system.NativeStart.main(Native Method) 
11-23 21:50:17.053: W/System.err(261): Caused by: java.sql.SQLException: inserting to database failed: INSERT INTO `categories` (`name`) VALUES (?) 
11-23 21:50:17.053: W/System.err(261): at com.j256.ormlite.misc.SqlExceptionUtil.create(SqlExceptionUtil.java:22) 
11-23 21:50:17.053: W/System.err(261): at com.j256.ormlite.android.AndroidDatabaseConnection.insert(AndroidDatabaseConnection.java:102) 
11-23 21:50:17.053: W/System.err(261): at com.j256.ormlite.stmt.mapped.MappedCreate.insert(MappedCreate.java:72) 
11-23 21:50:17.053: W/System.err(261): ... 24 more 
11-23 21:50:17.053: W/System.err(261): Caused by: android.database.sqlite.SQLiteException: no such table: categories: , while compiling: INSERT INTO `categories` (`name`) VALUES (?) 
11-23 21:50:17.073: W/System.err(261): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method) 
11-23 21:50:17.073: W/System.err(261): at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:91) 
11-23 21:50:17.073: W/System.err(261): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:64) 
11-23 21:50:17.073: W/System.err(261): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:80) 
11-23 21:50:17.073: W/System.err(261): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:36) 
11-23 21:50:17.073: W/System.err(261): at android.database.sqlite.SQLiteDatabase.compileStatement(SQLiteDatabase.java:1145) 
11-23 21:50:17.073: W/System.err(261): at com.j256.ormlite.android.AndroidDatabaseConnection.insert(AndroidDatabaseConnection.java:94) 
11-23 21:50:17.073: W/System.err(261): ... 25 more 
11-23 21:50:17.073: I/Database(261): sqlite returned: error code = 1, msg = no such table: categories 
11-23 21:50:17.073: I/Database(261): [ 11-23 21:50:17.083 261:0x105 I/java.sql.SQLException: queryForOne from database failed: SELECT * FROM `categories` WHERE `nObject Error 
11-23 21:50:17.083: I/Database(261): sqlite returned: error code = 1, msg = no such table: categories 
11-23 21:50:17.083: E/Recipe(261): java.sql.SQLException: queryForOne from database failed: SELECT * FROM `categories` WHERE `name` = ?

질문 :

  • 가없는 이유는 카테고리 데이터베이스를 만들 수 있습니다를 내 응용 프로그램을 시작할 때 다음과 같이 는하지만, 로그는 오류를 보여줍니다?
  • recipe 클래스의 ingredients 속성에 오류가 있습니까?

출처

2011-11-23 Happo

답변

1

오류 ORMLite는 당신이 문제를 해결하는 데 도움이되는 정보를 제공하기 위해 노력하고있다 로깅됩니다 : 당신은 조리법 경우

@ForeignCollectionField(eager = true) 
private Collection<Foodstuff> ingredients;

:

SQLException: Foreign collection object class com.android.droidfridge.data.Foodstuff 
    for field 'ingredients' does not contain a foreign field of class 
    class com.android.droidfridge.data.Recipe

귀하의 Recipe 클래스는 다음 필드를 포함을 성분이있는 경우에 Recipe를위한 Foodstuff에있는 외국 분야가 "소유하고있다". 그런 다음 외국 Account 필드가 있어야 Order 각 객체를 Order s의 수를 가진 Account이있는 경우, 예를 들어

SELECT * FROM foodstuff WHERE recipe_id = id;

:이 ORMLite 같은 일을 할 수 있습니다. 다음은 foreign collections의 설명서입니다.

레시피에 다른 레서피가 사용할 재료가 포함될 예정이라면 필요한 것은 외부 컬렉션이 아닌 "조인 테이블"이라고 생각합니다. 조인 테이블을 사용하는 "Many To Many" example을 살펴보십시오.

출처

2011-11-24 19:47:49 Gray

 관련 문제

  • 관련 문제 없음^_^