无法在android中启动/创建SQLite数据库

Question

我正在使用一个包含玩家姓名,胜利数量和损失数量的数据库表.
然后我会从主要活动,打开,更新或其他任何内容调用数据库,最后关闭.

这工作得很好.

然后我添加了其他列并继续工作.
但是,我将游戏安装到真实设备上并且无效.
我的模拟器中没有发生这个问题,因为它有点一次又一次地覆盖现有数据库.
我决定从模拟器中取消应用程序,然后停止工作.看起来我的游戏在首次启动时创建新数据库时遇到了一些麻烦.

在做了一些测试之后,我得到了不同的错误,比如"not null constrain"或"CursorIndexOutOfBounds".
因此,我可以说问题在于数据库的创建 - 但我不知道出了什么问题.
我不认为错误是在主Activity中,因为我在那里总是做同样的事以前它曾经工作,但我已经改变了数据库.

也许问题是我在onCreate()函数中初始化值的地方,就像它没有真正给数据库赋值？

无论如何,也许我一直在关注错误的观点,所以我认为新的观点可能有所帮助.

这里有数据库类:

public class DatabaseAdapter {

private final Context context;

public static final String C_COLUMNA_ID   = "_id";
public static final String C_COLUMNA_NAME = "menu_player";
public static final String C_COLUMNA_VICTORY = "menu_victory";
public static final String C_COLUMNA_LOSS = "menu_loss";
public static final String C_COLUMNA_POINTS = "menu_points";
public static final String C_COLUMNA_UNLOCKED = "menu_unlocked";
public static final String C_COLUMNA_LEVEL = "menu_level";

private static final String NAME_TABLE = "menu";
private static final String DATABASE_NAME = "data";
private static final String TAG = "DBAdapter";
private String INSERT_OR_UPDATE_RECORD;

private DatabaseHelper DatabaseHelper;
private SQLiteDatabase db;

public DatabaseAdapter(Context context){
    this.context = context;
    DatabaseHelper = new DatabaseHelper(context);
}

private static class DatabaseHelper extends SQLiteOpenHelper{

    private static final int DATABASE_VERSION = 1;

    public DatabaseHelper(Context context){
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase database){
        database.execSQL( "CREATE TABLE MENU(" +
                " _id INTEGER PRIMARY KEY," +
                " menu_player TEXT NOT NULL, " +
                " menu_victory INTEGER, " +
                " menu_loss INTEGER," +
                " menu_points INTEGER," +
                " menu_unlocked INTEGER," +
                " menu_level INTEGER)");

        //initialize
        database.execSQL("INSERT INTO MENU(_id, menu_player) VALUES(1,'Pla Yer Uan')");
        database.execSQL("INSERT INTO MENU(_id, menu_victory) VALUES(1,0)");
        database.execSQL("INSERT INTO MENU(_id, menu_loss) VALUES(1,0)");
        database.execSQL("INSERT INTO MENU(_id, menu_points) VALUES(1,0)");
        database.execSQL("INSERT INTO MENU(_id, menu_unlocked) VALUES(1,0)");
        database.execSQL("INSERT INTO MENU(_id, menu_level) VALUES(1,1)");

    }

    @Override
    public void onUpgrade(SQLiteDatabase database, int oldVersion, int newVersion){
        database.execSQL("DROP TABLE IF EXISTS todo");
        onCreate(database);
    }

}

public DatabaseAdapter open() throws SQLException{
    db = DatabaseHelper.getWritableDatabase();
    return this;
}

public void close(){
    DatabaseHelper.close();
}

public boolean updateRecord(long rowId, String columna, String newPlayerName, int value){
    ContentValues args = new ContentValues();
    switch (columna){
        case "nombre":
            args.put(C_COLUMNA_NOMBRE, newPlayerName);
            break;
        case "victory":
            args.put(C_COLUMNA_VICTORY,value);
            break;
        case "loss":
            args.put(C_COLUMNA_LOSS,value);
            break;
        case "royals":
            args.put(C_COLUMNA_POINTS,value);
            break;
        case "unlocked":
            args.put(C_COLUMNA_UNLOCKED,value);
            break;
        case "level":
            args.put(C_COLUMNA_LEVEL,value);
            break;
    }

    return db.update(NAME_TABLE,args,C_COLUMNA_ID + "=" + rowId,null)>0;
}

public void backToDefault(){
    ContentValues args = new ContentValues();
    args.put(C_COLUMNA_NAME, "Pla Yer Uan");
    args.put(C_COLUMNA_VICTORIAS,0);
    args.put(C_COLUMNA_DERROTAS,0);
    args.put(C_COLUMNA_ROYALS,0);
    args.put(C_COLUMNA_UNLOCKED,0);
    args.put(C_COLUMNA_LEVEL,1);
    db.update(NAME_TABLE,args,C_COLUMNA_ID + "=" + 1,null);
}

public Cursor getRecord(long rowId, String columna) throws SQLException{
    Cursor cursor = db.query(true, NAME_TABLE, new String[]{
            C_COLUMNA_ID,
            columna
            },
            C_COLUMNA_ID + "=" + rowId,
            null,
            null,
            null,
            null,
            null);
    if (cursor != null){
        cursor.moveToFirst();
    }
    return cursor;
}

}

得到此错误:

android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0

Answer 1

这个

    //initialize
    database.execSQL("INSERT INTO MENU(_id, menu_player) VALUES(1,'Pla Yer Uan')");
    database.execSQL("INSERT INTO MENU(_id, menu_victory) VALUES(1,0)");
    database.execSQL("INSERT INTO MENU(_id, menu_loss) VALUES(1,0)");
    database.execSQL("INSERT INTO MENU(_id, menu_points) VALUES(1,0)");
    database.execSQL("INSERT INTO MENU(_id, menu_unlocked) VALUES(1,0)");
    database.execSQL("INSERT INTO MENU(_id, menu_level) VALUES(1,1)");

真的错了

您必须一次插入一个完整的行,如下所示:

    //initialize
    database.execSQL("INSERT INTO MENU(menu_player, menu_victory, menu_loss, menu_points, menu_unlocked, menu_level) VALUES('Pla Yer Uan', 0, 0, 0, 0, 1)");

另请注意,您不必插入_id字段,因为它是自动增量主键