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我開始進入SQLite和Android數據庫，我剛剛發現這個問題。我已經閱讀了很多類似的問題，但我還沒有找到解決方案。Android SQLite「沒有這樣的表」異常
這是我得到的錯誤：
E/AndroidRuntime（529）：android.database.sqlite.SQLiteException：通過沒有造成這樣的表：ligas_bd：，編譯時：SELECT * FROM ligas_bd
這是我的代碼。
DBHelper myDbHelper = new DBHelper(this);
myDbHelper = new DBHelper(this);
try {
myDbHelper.createDataBase();
} catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {
myDbHelper.open();
SQLiteDatabase db = null;
db = myDbHelper.getWritableDatabase();
String[] args = new String[] {""};
Cursor c = db.rawQuery(" SELECT * FROM ligas_bd", args); <---- Error in this line
if (c.moveToFirst()) {
do {
String cod = c.getString(0);
String nombre = c.getString(1);
String flag = c.getString(0);
String cod_url = c.getString(0);
ligas.add(new Item_Liga(nombre, flag, cod, cod_url));
} while(c.moveToNext());
}
}catch(SQLException sqle){
throw sqle;
}
DBHelper.java
public class DBHelper extends SQLiteOpenHelper{
private static String DB_NAME = "ligas_bd";
private SQLiteDatabase myDataBase;
private final Context myContext;
public DBHelper(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
}
public void createDataBase() throws IOException{
boolean dbExist = checkDataBase();
if(dbExist){ }
else {
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copiando Base de Datos");
}
}
}
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try {
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
} catch(SQLiteException e) { }
if(checkDB != null) {
checkDB.close();
}
return checkDB != null ? true : false;
}
private void copyDataBase() throws IOException{
InputStream myInput = myContext.getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
OutputStream myOutput = new FileOutputStream(outFileName);
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0) {
myOutput.write(buffer, 0, length);
}
myOutput.flush();
myOutput.close();
myInput.close();
}
public void open() throws SQLException{
try {
createDataBase();
} catch (IOException e) {
throw new Error("Ha sido imposible crear la Base de Datos");
}
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if(myDataBase != null)
myDataBase.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) { }
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { }
我也檢查了我的手機根本Explorer數據/數據/ mypackagename /數據庫和數據庫在那裏出現是正常的。
我的數據庫和主表具有相同的名稱，你可以在這個PIC SQLite數據庫瀏覽器中看到：
我沒有創建表時，我使用SQLite數據庫之前創建它瀏覽器和我只是想讀取它
我不知道怎麼了，但我終於修好了。我剛剛開始，這次是this tutorial。 希望它有幫助！
什麼是'DB_PATH'？ – Squonk 2012-03-28 23:57:28
是數據庫必須的路徑。它是/ data/data/mypackagename/databases – andoni90 2012-03-29 08:04:49