Android room migration nullエラー

Question

Androidで古いsqliteからRoomへの移行を行っているときに、 "INTEGER NOT NULL"を使用してコンパイルする必要があります。 マイグレーション中にNULLフィールドを「NOT NULL」パラメータで新しいテーブルに挿入するとエラーが発生する

android.database.sqlite.SQLiteConstraintException：NOT NULL制約に失敗しました：note.notification_state （コード1299）

編集：

11-29 22:52:58.891 14605-14630/com.aleksandarvasilevski.notes E/AndroidRuntime: FATAL EXCEPTION: pool-1-thread-1 
                      Process: com.aleksandarvasilevski.notes, PID: 14605 
                      java.lang.IllegalStateException: Migration didn't properly handle note(com.aleksandarvasilevski.notes.repository.db.Note). 
                      Expected: 
                      TableInfo{name='note', columns={notification_date=Column{name='notification_date', type='TEXT', notNull=false, primaryKeyPosition=0}, priority=Column{name='priority', type='INTEGER', notNull=true, primaryKeyPosition=0}, description=Column{name='description', type='TEXT', notNull=false, primaryKeyPosition=0}, title=Column{name='title', type='TEXT', notNull=false, primaryKeyPosition=0}, id=Column{name='id', type='INTEGER', notNull=true, primaryKeyPosition=1}, notification_state=Column{name='notification_state', type='INTEGER', notNull=true, primaryKeyPosition=0}, created_date=Column{name='created_date', type='TEXT', notNull=false, primaryKeyPosition=0}}, foreignKeys=[], indices=[]} 
                      Found: 
                      TableInfo{name='note', columns={notification_date=Column{name='notification_date', type='TEXT', notNull=false, primaryKeyPosition=0}, priority=Column{name='priority', type='INTEGER', notNull=false, primaryKeyPosition=0}, title=Column{name='title', type='TEXT', notNull=false, primaryKeyPosition=0}, description=Column{name='description', type='TEXT', notNull=false, primaryKeyPosition=0}, id=Column{name='id', type='INTEGER', notNull=true, primaryKeyPosition=1}, notification_state=Column{name='notification_state', type='INTEGER', notNull=false, primaryKeyPosition=0}, created_date=Column{name='created_date', type='TEXT', notNull=false, primaryKeyPosition=0}}, foreignKeys=[], indices=[]} 
                       at com.aleksandarvasilevski.notes.repository.db.NoteDatabase_Impl$1.validateMigration(NoteDatabase_Impl.java:70) 
                       at android.arch.persistence.room.RoomOpenHelper.onUpgrade(RoomOpenHelper.java:75) 
                       at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.onUpgrade(FrameworkSQLiteOpenHelper.java:118) 
                       at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:256) 
                       at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163) 
                       at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.getWritableSupportDatabase(FrameworkSQLiteOpenHelper.java:93) 
                       at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper.getWritableDatabase(FrameworkSQLiteOpenHelper.java:54) 
                       at android.arch.persistence.room.RoomDatabase.query(RoomDatabase.java:193) 
                       at com.aleksandarvasilevski.notes.repository.db.NoteDao_Impl$5.compute(NoteDao_Impl.java:195) 
                       at com.aleksandarvasilevski.notes.repository.db.NoteDao_Impl$5.compute(NoteDao_Impl.java:181) 
                       at android.arch.lifecycle.ComputableLiveData$2.run(ComputableLiveData.java:87) 
                       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133) 
                       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607) 
                       at java.lang.Thread.run(Thread.java:761) 

コード：

`@database（エンティティ= {Note.class}、バージョン= 3） パブリック抽象クラスNoteDatabase RoomDatabaseを拡張{

public static final Migration MIGRATION_2_3 = new Migration(2, 3) { 
    @Override 
    public void migrate(@NonNull SupportSQLiteDatabase database) { 

     database.execSQL(
       "CREATE TABLE note (id INTEGER NOT NULL, title TEXT, description TEXT, created_date TEXT, notification_date TEXT, notification_state INTEGER, priority INTEGER, PRIMARY KEY(id))"); 


     database.execSQL(
       "INSERT INTO note (id, title, description, created_date) SELECT _ID, title, description, date FROM notes"); 

    } 
};` 

Answer 1

[OK]を、私は誰もが同じ問題を抱えている場合は、それだけで使い、作業ましNOT NULL DEFAULT 0（または他の数）。

@Database(entities = {Note.class}, version = 3) 

パブリック抽象クラスNoteDatabaseはRoomDatabase {

public static final Migration MIGRATION_2_3 = new Migration(2, 3) { 
    @Override 
    public void migrate(@NonNull SupportSQLiteDatabase database) { 

     database.execSQL(
       "CREATE TABLE note (id INTEGER NOT NULL, title TEXT, description TEXT, created_date TEXT, notification_date TEXT, notification_state INTEGER NOT NULL DEFAULT 0, priority INTEGER NOT NULL DEFAULT 0, PRIMARY KEY(id))"); 

     database.execSQL(
       "INSERT INTO note (id, title, description, created_date) SELECT _ID, title, description, date FROM notes"); 

    } 
};