Databases
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POSQLite Database cannot be opened
 

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  1. POSQLite Database cannot be opened
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    <p>I am very new to creating and manipulating databases and I seem to be stuck, my logcat keeps telling me that it cannot open the database? </p> <blockquote> <p>09-12 13:02:31.823: I/SqliteDatabaseCpp(7213): sqlite returned: error code = 14, msg = cannot open file at line 27701 of [8609a15dfa], db=/data/data/net.learn2develop.Database/databases/database</p> </blockquote> <p>Im guessing it cannot find it but i am usure why. Thanks to many of you on here i have worked my way this far but am still getting stuck, What my code is doing is importing a database i made from the assets folder. Here is my database helper class:</p> <pre><code>public class DatabaseHelper extends SQLiteOpenHelper { public static final String KEY_ROWID = "_id"; public static final String KEY_ALCOHOL = "alcohol"; public static final String KEY_TYPE = "type"; public static final String KEY_BRAND = "brand"; public static final String KEY_PRICE = "price"; private static final String TAG = "DatabaseHelper"; private static String DB_PATH = "/data/data/net.learn2develop.Database/databases/"; private static String DB_NAME = "database"; private static final String DB_TABLE = "booze"; private SQLiteDatabase myDataBase; private final Context myContext; /** * Constructor * Takes and keeps a reference of the passed context in order to access to the application assets and resources. * @param context */ public DatabaseHelper(Context context) { super(context, DB_NAME, null, 1); this.myContext = context; } /** * Creates a empty database on the system and rewrites it with your own database. * */ public void createDataBase() throws IOException{ boolean dbExist = checkDataBase(); if(dbExist){ //do nothing - database already exist }else{ //By calling this method and empty database will be created into the default system path //of your application so we are gonna be able to overwrite that database with our database. this.getReadableDatabase(); try { copyDataBase(); } catch (IOException e) { throw new Error("Error copying database"); } } } /** * Check if the database already exist to avoid re-copying the file each time you open the application. * @return true if it exists, false if it doesn't */ private boolean checkDataBase(){ SQLiteDatabase checkDB = null; try{ String myPath = DB_PATH + DB_NAME; checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY); }catch(SQLiteException e){ //database does't exist yet. } if(checkDB != null){ checkDB.close(); } return checkDB != null ? true : false; } /** * Copies your database from your local assets-folder to the just created empty database in the * system folder, from where it can be accessed and handled. * This is done by transfering bytestream. * */ private void copyDataBase() throws IOException{ //Open your local db as the input stream InputStream myInput = myContext.getAssets().open(DB_NAME); // Path to the just created empty db String outFileName = DB_PATH + DB_NAME; //Open the empty db as the output stream OutputStream myOutput = new FileOutputStream(outFileName); //transfer bytes from the inputfile to the outputfile byte[] buffer = new byte[1024]; int length; while ((length = myInput.read(buffer))&gt;0){ myOutput.write(buffer, 0, length); } //Close the streams myOutput.flush(); myOutput.close(); myInput.close(); } public void openDataBase() throws SQLException{ //Open the database 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 myDataBase) { } @Override public void onUpgrade(SQLiteDatabase myDataBase, int oldVersion, int newVersion) { Log.w(TAG, "Upgrading database from version " + oldVersion + " to " + newVersion + ", which will destroy all old data"); myDataBase.execSQL("DROP TABLE IF EXISTS titles"); onCreate(myDataBase); } //---insert a title into the database--- public long insertTitle(String alcohol, String type, String brand, int price) { ContentValues initialValues = new ContentValues(); initialValues.put(KEY_ALCOHOL, alcohol); initialValues.put(KEY_TYPE, type); initialValues.put(KEY_BRAND, brand); initialValues.put(KEY_PRICE, price); return myDataBase.insert(DB_TABLE, null, initialValues); } //---retrieves a particular title--- public Cursor getTitle(long rowId) throws SQLException { Cursor mCursor = myDataBase.query(true, DB_TABLE, new String[] { KEY_ROWID, KEY_ALCOHOL, KEY_TYPE, KEY_BRAND, KEY_PRICE }, KEY_ROWID + "=" + rowId, null, null, null, null, null); if (mCursor != null) { mCursor.moveToFirst(); } return mCursor; } </code></pre> <p>Here is what I am calling in my activity as a test to see if i can read the DB:</p> <pre><code>public class DatabaseActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_database); DatabaseHelper myDbHelper = new DatabaseHelper(this); //---get a title--- myDbHelper.openDataBase(); Cursor c = myDbHelper.getTitle(2); if (c.moveToFirst()) DisplayTitle(c); else Toast.makeText(this, "No title found", Toast.LENGTH_LONG).show(); myDbHelper.close(); } public void DisplayTitle(Cursor c) { Toast.makeText(this, "id: " + c.getString(0) + "\n" + "ALCOHOL: " + c.getString(1) + "\n" + "TYPE: " + c.getString(2) + "\n" + "BRAND: " + c.getString(3) + "\n" + "PRICE: " + c.getString(4), Toast.LENGTH_LONG).show(); } } </code></pre> <p>The name of my database i created is just "database", the activity is "DatabaseActivity.java" and the helper file is "DatabaseHelper.java"</p> <p>Here is what my database looks like <img src="https://i.stack.imgur.com/y1wnr.png" alt="enter image description here"></p>
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    1. This table or related slice is empty.
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    1. USHockeyman271
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. COtry cahnge field DB_NAME = "database" on DB_NAME = "database.sqlite"
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