2

AndroidでSQLiteを使用できません。XMLファイルを解析してから、コンテンツを保存するデータベースを作成することができます。作成、挿入は正常に機能します。ファイルエクスプローラーで.dbファイルを確認できます

checkDataBase()を最後に呼び出したところ、falseが返されますか?!なんで ?

私はenエミュレーターでAndroid2.3に取り組んでいます。

私は何か間違ったことをしていますか?

アクティビティ:

public class MTGDBActivity extends Activity{

    String currentDBPath = "data/data/rudy.jaumain.mtgdb/databases/MTGCards";
    MTGContainerData mtgcd;
    MTGDatabase mtgdb;

    Button buttonEditions, buttonCollection, buttonDecks;
    View v;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        try {
                this.mtgcd = new MTGContainerData(this);
                if (!this.checkDataBase()) {
                    System.out.println("FILE DOESN'T EXIST");
                    this.mtgdb = new MTGDatabase(this);
                    this.mtgdb.open();
                    this.mtgcd.loadCards(this.mtgdb);
                    System.out.println("CARDS LOADED");
                    this.mtgdb.close();
                }
                else{
                    System.out.println("FILE DOES EXIST");
                }

        } catch (Exception e) {
            System.out.println("FAIL");
        }

        System.out.println(this.checkDataBase());
        this.setContentView(R.layout.main);
        this.initialize();
    }

    private boolean checkDataBase() {
        SQLiteDatabase checkDB = null;
        try {
            checkDB = SQLiteDatabase.openDatabase(currentDBPath, null,
                    SQLiteDatabase.OPEN_READONLY);
            checkDB.close();
        } catch (SQLiteException e) {
            System.out.println("DATABASE DOES NOT EXIST");
        }
        return checkDB != null ? true : false;
    }


    public void initialize(){
        try{

            v = (View)this.findViewById(R.id.mainLayout);
            v.setBackgroundColor(Color.WHITE);

            this.buttonEditions = (Button)findViewById(R.id.buttonEdition);
            this.buttonEditions.setOnClickListener(new OnClickListener(){
                @Override
                public void onClick(View v) {

                    System.out.println("CLICKED");
                        Intent i = new Intent(v.getContext(), MTGDBEditionsActivity.class);
                        startActivityForResult(i,0);
                }
            });

            this.buttonCollection = (Button)findViewById(R.id.buttonCollection);
            this.buttonCollection.setOnClickListener(new OnClickListener(){
                @Override
                public void onClick(View v) {

                    System.out.println("CLICKED");
                        Intent i = new Intent(v.getContext(), MTGDBCollectionActivity.class);
                        startActivityForResult(i,0);
                }
            });

            this.buttonDecks = (Button)findViewById(R.id.buttonDecks);
            this.buttonDecks.setOnClickListener(new OnClickListener(){
                @Override
                public void onClick(View v) {

                    System.out.println("CLICKED");
                        Intent i = new Intent(v.getContext(), MTGDBDecksActivity.class);
                        startActivityForResult(i,0);
                }
            });

        }
        catch(Exception e1){
            e1.printStackTrace();
        }

    }
}

データベース:

public class MTGDatabase{

private static final String TABLE_CARDS = "table_cards";
private static final String COL_ID = "ID";
private static final int NUM_COL_ID = 0;
private static final String COL_NAME = "NAME";
private static final int NUM_COL_NAME = 1;
private static final String COL_EDITION = "EDITION";
private static final int NUM_COL_EDITION = 2;
private static final String COL_RARITY = "RARITY";
private static final int NUM_COL_RARITY = 3;
private static final String COL_MANACOST = "MANACOST";
private static final int NUM_COL_MANACOST = 4;
private static final String COL_NUMBER = "NUMBER";
private static final int NUM_COL_NUMBER = 5;
private static final String COL_COLOR = "COLOR";
private static final int NUM_COL_COLOR = 6;

public int VERSION_BDD = 1;
private SQLiteDatabase sqldb;
private MTGDatabaseAdapter mtgbdAdapter;

public MTGDatabase(Context c) {
    mtgbdAdapter = new MTGDatabaseAdapter(c, "MTGCards.db", null, VERSION_BDD);
}

public void open(){
    sqldb = mtgbdAdapter.getWritableDatabase();
}

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

public SQLiteDatabase getDatabase(){
    return sqldb;
}

public long insertCard(MTGCard card){
    ContentValues values = new ContentValues();
    values.put(COL_NAME, card.getName());
    values.put(COL_EDITION, card.getEdition());
    values.put(COL_RARITY, card.getRarity());
    values.put(COL_MANACOST, card.getManacost());
    values.put(COL_NUMBER, card.getNumber());
    values.put(COL_COLOR, card.getColor());
    return sqldb.insert(TABLE_CARDS, null, values);
}

public int updateCard(int id, MTGCard card){
    ContentValues values = new ContentValues();
    values.put(COL_NAME, card.getName());
    values.put(COL_EDITION, card.getEdition());
    values.put(COL_RARITY, card.getRarity());
    values.put(COL_MANACOST, card.getManacost());
    values.put(COL_NUMBER, card.getNumber());
    values.put(COL_COLOR, card.getColor());
    return sqldb.update(TABLE_CARDS, values, COL_ID + " = " +id, null);
}

public int removeCardWithID(int id){
    return sqldb.delete(TABLE_CARDS, COL_ID + " = " +id, null);
}

public MTGCard getCardWithName(String name){
    Cursor c = sqldb.query(TABLE_CARDS, new String[] {COL_ID, COL_NAME, COL_EDITION, COL_RARITY, COL_MANACOST, COL_NUMBER, COL_COLOR}, COL_NAME + " LIKE \"" + name +"\"", null, null, null, null);
    return cursorToCard(c);
}


private MTGCard cursorToCard(Cursor c){

    if (c.getCount() == 0)
        return null;

    c.moveToFirst();

    MTGCard card = new MTGCard();
    card.setId(c.getInt(NUM_COL_ID));
    card.setName(c.getString(NUM_COL_NAME));
    card.setEdition(c.getString(NUM_COL_EDITION));
    card.setRarity(c.getString(NUM_COL_RARITY));
    card.setManacost(c.getString(NUM_COL_MANACOST));
    card.setNumber(c.getString(NUM_COL_NUMBER));
    card.setColor(c.getString(NUM_COL_COLOR));

    c.close();

    return card;
}
}

データベースアダプタ:

public class MTGDatabaseAdapter extends SQLiteOpenHelper {
private static final String TABLE_CARDS = "table_cards";
private static final String COL_ID = "_ID";
private static final String COL_NAME = "NAME";
private static final String COL_EDITION = "EDITION";
private static final String COL_RARITY = "RARITY";
private static final String COL_MANACOST = "MANACOST";
private static final String COL_NUMBER = "NUMBER";
private static final String COL_COLOR = "COLOR";

private static final String CREATE_BDD = "CREATE TABLE " 
    + TABLE_CARDS 
+ " (" + COL_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " 
+ COL_NAME + " TEXT NOT NULL, "
+ COL_EDITION + " TEXT NOT NULL, "
+ COL_RARITY + " TEXT NOT NULL, "
+ COL_MANACOST + " TEXT NOT NULL, "
+ COL_NUMBER + " TEXT NOT NULL, "
+ COL_COLOR + " TEXT NOT NULL);";

public MTGDatabaseAdapter(Context context, String name,
        CursorFactory factory, int version) {
    super(context, name, factory, version);
}

@Override
public void onCreate(SQLiteDatabase db) {
    // TODO Auto-generated method stub
    db.execSQL(CREATE_BDD);

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    db.execSQL("DROP TABLE " + TABLE_CARDS + ";");
    onCreate(db);
}
}
4

2 に答える 2

5

SQLiteOpenHelper クラスを使用することをお勧めします: http://developer.android.com/reference/android/database/sqlite/SQLiteOpenHelper.html

データベースが存在しない場合、このクラスはデータベースを作成します。このためonCreate()、SQLiteOpenHelper クラスを拡張するとオーバーライドできるメソッド内のコードが実行されます。

getReadableDatabase()およびgetWritableDatabase()メソッドを呼び出して、データベース インスタンスを取得できます。

于 2012-04-17T21:53:44.423 に答える
2

Calling getReadableDatabase() or getWriteableDatabase() on your SQLiteOpenHelper instance will create the database if it has not been already. You should not need any hardcoded paths in your implementation in order to set up your application's database (I'm not sure what you are trying to do with "parsing the XML").

See the NotePad tutorial on the developers site for a reference when creating your SQLiteOpenHelper class.

See this post for some information on how to correctly handle your SQLiteOpenHelper over the course of the application's lifecycle.

于 2012-04-17T22:06:31.537 に答える