Question

我有一个问题因为我正在尝试编程的应用程序几天。这很简单，当用户点击imageview时，数据库必须更新并将此数据设置为“收藏夹”。这是代码：

主要活动

    public void onResume(){
    super.onResume();

    Pref = getSharedPreferences("DoctorGames", MODE_PRIVATE);
    pref = Pref.getString("pref", pref);

    try { try {
            Log.i("TEST0", String.valueOf(ID));

            mDbHelper.open();
            String query = "SELECT * FROM tgames WHERE _id = '" + ID + "'; ";
            final Cursor cursor = mDbHelper.mDb.rawQuery(query, null);
            cursor.moveToFirst();

            String prefTEST = cursor.getString(cursor.getColumnIndexOrThrow("favorite"));
            Log.i("TEST1", prefTEST + query);

            DataHelper.updateFav(ID, pref, mDbHelper.mDb);

            prefTEST = cursor.getString(cursor.getColumnIndexOrThrow("favorite"));

            cursor.close();
            mDbHelper.close();

            Log.i("TEST2", pref +" " + prefTEST);

    } catch ( CursorIndexOutOfBoundsException i){
        Log.i("TEST", "Second");
    }
    }catch(NullPointerException e){
        Log.i("TEST", "FIRST");
    };
}

游戏活动

   //Remove from favorite
     favorite.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            pref = "co";
             favorite.setVisibility(View.GONE);
             co.setVisibility(View.VISIBLE);
             mEditor.putString("pref", pref);
             Log.i("TEST", pref);

         }
     });

    //Add to favorite
    co.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            pref = "favorite";
            favorite.setVisibility(View.VISIBLE);
            co.setVisibility(View.GONE);
            mEditor.putString("pref", pref);
            Log.i("TEST", pref);
        }
    });

DataHelper类

公共类DataHelper扩展了SQLiteOpenHelper {

public static final String TABLE_ROW_ID = "_id";
public static final String TABLE_ROW_NAME = "name";
public static final String TABLE_ROW_PLACE = "place";
public static final String TABLE_ROW_AGEMIN = "agemin";
public static final String TABLE_ROW_AGEMAX = "agemax";
public static final String TABLE_ROW_NBREMIN = "nbremin";
public static final String TABLE_ROW_NBREMAX = "nbremax";
public static final String TABLE_ROW_TYPE = "type";
public static final String TABLE_ROW_DESCRIPTION = "description";
public static final String TABLE_ROW_FAVORITE = "favorite";
public static final String TABLE_ROW_IMG = "img";

private static final String TABLE_GAMES = "tgames";
boolean exterieur = true;
boolean interieur = false;
boolean co = false;
boolean fav = true;
private static final int DB_VERSION = 1;

private static String TAG = "DataHelper";
private static String DB_PATH = "";
private static String DB_NAME = "games.db";
public static SQLiteDatabase mDB;
private final Context mContext;

File dbFile =new File(DB_PATH + DB_NAME);

public DataHelper(Context context){
    super(context, DB_NAME, null, 1);
    if (Build.VERSION.SDK_INT >= 17){
        DB_PATH = context.getApplicationInfo().dataDir + "/databases/";
        //DB_PATH = context.getFilesDir().toString();
    }else{
        DB_PATH="/data/data/" + context.getPackageName() + "/databases/";
    }
    this.mContext = context;
}

public void createDataBase() throws IOException
{
    boolean mDataBaseExist = checkDataBase();
    if(!mDataBaseExist){
        this.getReadableDatabase();
    }
    this.close();
    try{
        copyDataBase();
        Log.e(TAG, "createDatabase data base created");
    }catch (IOException mIOException){
        //throw new Error("ErroCopyingDatabase");
    }
}

private boolean checkDataBase(){
    File dbFile =new File(DB_PATH + DB_NAME);
    return dbFile.exists();
}

private void copyDataBase() throws IOException{
    InputStream mInput = mContext.getAssets().open(DB_NAME);
    String outFileName = DB_PATH + DB_NAME;
    OutputStream mOutPut = new FileOutputStream(outFileName);
    byte[] mBuffer = new byte [1024];
    int mLength;
    while ((mLength = mInput.read(mBuffer))>0){
        mOutPut.write(mBuffer, 0, mLength);
    }
    mOutPut.flush();
    mOutPut.close();
    mInput.close();
}

public boolean openDataBase() throws SQLiteException {
    String mPath = DB_PATH + DB_NAME;
    mDB = SQLiteDatabase.openDatabase(mPath, null, SQLiteDatabase.CREATE_IF_NECESSARY);
    //mDB = SQLiteDatabase.openDatabase(mPath, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS);
    return mDB != null;
}

public Cursor selectAll(){
    Cursor cAll = mDB.rawQuery("SELECT * from tgames", null);
    return cAll;
}


public static Cursor search (String name, boolean place, int agemin, int agemax, int nbremin,
                             int nbremax, String type, String description, boolean favorite){
    //A redefinir selon le critère
    //peut etre une recherche par colonne, si élément est pas null? (mais les critères s'entrecroiseront pas alors)

    String query = "SELECT " +
            TABLE_ROW_ID +", " +
            TABLE_ROW_NAME + ", " +
            TABLE_ROW_PLACE + ", " +
            TABLE_ROW_AGEMIN + ", " +
            TABLE_ROW_AGEMAX + ", " +
            TABLE_ROW_NBREMIN + ", " +
            TABLE_ROW_NBREMAX + ", " +
            TABLE_ROW_TYPE + ", " +
            TABLE_ROW_DESCRIPTION + ", " +
            TABLE_ROW_FAVORITE + ", " +
            TABLE_ROW_IMG +
            " from " +
            TABLE_GAMES + " WHERE " +
            TABLE_ROW_NAME + " = '" + name + "' or " +
            TABLE_ROW_PLACE + " = '" + place + "' or " +
            TABLE_ROW_AGEMIN + " = '" + agemin + "' or " +
            TABLE_ROW_AGEMAX + " = '" + agemax + "' or " +
            TABLE_ROW_NBREMIN + " = '" + nbremin + "' or " +
            TABLE_ROW_NBREMAX + " = '" + nbremax + "' or " +
            TABLE_ROW_TYPE + " = '" + type + "' or " +
            TABLE_ROW_DESCRIPTION + " = '" + description + "' or " +
            TABLE_ROW_FAVORITE + " = '" + favorite + "';";


    Cursor c = mDB.rawQuery(query, null);
    return c;
}

public static Cursor searchTEST(String name, String place, String agemin, String agemax, String nbremin,
                                String nbremax, String type, String favorite) {

    Cursor c = mDB.query(TABLE_GAMES, new String[]{
                    TABLE_ROW_NAME,
                    TABLE_ROW_PLACE,
                    TABLE_ROW_AGEMIN,
                    TABLE_ROW_AGEMAX,
                    TABLE_ROW_NBREMIN,
                    TABLE_ROW_NBREMAX,
                    TABLE_ROW_TYPE,
                    TABLE_ROW_DESCRIPTION,
                    TABLE_ROW_FAVORITE},

            TABLE_ROW_NAME + " = ? AND " +
                    TABLE_ROW_PLACE + " = ? AND " +
                    TABLE_ROW_AGEMIN + " = ? AND " +
                    TABLE_ROW_AGEMAX + " = ? AND " +
                    TABLE_ROW_NBREMIN + " = ? AND " +
                    TABLE_ROW_NBREMAX + " = ? AND " +
                    TABLE_ROW_TYPE + " = ? AND " +
                    TABLE_ROW_FAVORITE + " = ?",

            new String[]{name, place, agemin, agemax, nbremin, nbremax, type, favorite},
            null,
            null,
            null);
    return c;
}

//MTHODE TEST RECHERCHE
public static Cursor searchNAME(String name){
    String query = "SELECT " +
            TABLE_ROW_NAME + ", " +
            TABLE_ROW_PLACE + ", " +
            TABLE_ROW_AGEMIN + ", " +
            TABLE_ROW_AGEMAX + ", " +
            TABLE_ROW_NBREMIN + ", " +
            TABLE_ROW_NBREMAX + ", " +
            TABLE_ROW_TYPE + ", " +
            TABLE_ROW_DESCRIPTION + ", " +
            TABLE_ROW_FAVORITE +
            " from " +
            TABLE_GAMES + " WHERE " +
            TABLE_ROW_NAME + " = '" + name + "';";

    Cursor c = mDB.rawQuery(query, null);
    return c;

}

//Update FAVORI
public static void updateFav(int id, String fav, SQLiteDatabase DB){

    ContentValues values = new ContentValues();
    values.put("favorite", fav);

    String selection = "_id" +" = '" + id + "'";
    //String[]selectionArgs = {String.valueOf(id)};

    DB.update("tgames",
            values,
            selection,
            null);

    Log.i("TEST55", values + selection );
}



@Override
public void onCreate(SQLiteDatabase mDB) {
}

@Override
public void onUpgrade(SQLiteDatabase mDB, int oldVersion, int newVersion)  {

}

 }

任何帮助将不胜感激：）

Answer 1

您的UPDATE功能不在事务中，因此更改将在db.close()回滚。试试这个......

SQLiteDatabase db = this.getWritableDatabase();
db.beginTransaction()

...insert, update, delete, etc

if (ok) {
   db.setTransactionSucessful();
}
db.endTransaction();
db.close();

Answer 2

您的更新方法就像

public static void updateFav

虽然您将此方法设为静态，但您的databasehelper类在方法为静态时保持对object的引用。

请像这样做

public void updateFav(args..){}

并将其用作

mhelper.updateFav(args);

它应该工作。希望它有所帮助。

我的应用程序中的更新功能无效

2 个答案: