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안드로이드에서 SQLite 사용에 문제가 있습니다. XML 파일을 구문 분석 한 다음 콘텐츠를 저장할 데이터베이스를 만들 수 있습니다. 생성, 삽입이 정상적으로 작동합니다. 파일 탐색기에서 .db 파일을 볼 수 있습니다.안드로이드 시작시 데이터베이스를 생성하고 다음에 그것을 검색하는 방법 시작시
마지막으로 checkDataBase()를 호출하면 false가 반환됩니다. 왜 ?
Android 2.3 on en emulator에서 작업 중입니다.
내가 잘못 했나요?
활동 :
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();
}
}
}
데이터베이스 :
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;
}
}
데이터베이스 어댑터 :
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);
}
}
'checkDataBase()'를 실행할 때 디버거에서 보여줄 내용은 무엇입니까? –
System.out.println 대신 checkDataBase()'Log.e ("tag", "DATABASE DOES NOT EXIST", e);를 입력하면 예외가 출력됩니다. – zapl
고마워요, 저 바보예요! – Rudz17