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POConnecting to an existing SQLite DB
 

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  1. POConnecting to an existing SQLite DB
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    <p>i'm trying to do the same as on this tutorial: <a href="http://www.reigndesign.com/blog/using-your-own-sqlite-database-in-android-applications/" rel="nofollow">http://www.reigndesign.com/blog/using-your-own-sqlite-database-in-android-applications/</a> But i'm facing some difficulties. Here is my class:</p> <pre><code>public class TechAgrumeSQLiteHelper extends SQLiteOpenHelper { //The Android's default system path of your application database. private static String DB_PATH = "/data/data/test.test.test/databases/"; private static String DB_NAME = "Player_Club"; private SQLiteDatabase myDataBase; private final Context myContext; private static final String TABLE_PLAYERS = "Player"; private static final int DATABASE_VERSION = 3; // Contacts Table Columns names private static final String KEY_CODE = "_id"; private static final String KEY_NOM = "nom_Player"; private static final String KEY_SURNOM = "surnom_Player"; private static final String KEY_AGE = "age_Player"; /** * Constructor * Takes and keeps a reference of the passed context in order to access to the application assets and resources. * @param context */ public TechAgrumeSQLiteHelper(Context context) { super(context, DB_NAME, null, 1); this.myContext = context; Log.d("I'm here: ","I'm here!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"); boolean dbExist = checkDataBase(); if(dbExist){ //do nothing - database already exist Log.d("Copy BD","database already exists!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"); }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(); Log.d("Copy BD","Datbase copied!!!!!!!!!!!!!!!!!!!!!!!!!!!"); } catch (IOException e) { throw new Error("Error copying database"); } } } /** * Creates a empty database on the system and rewrites it with your own database. * */ public void createDataBase() throws IOException{ } /** * 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 db) { } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { } // Add your public helper methods to access and get content from the database. // You could return cursors by doing "return myDataBase.query(....)" so it'd be easy // to you to create adapters for your views. void addPlayer(Player player) { SQLiteDatabase db = this.getWritableDatabase(); ContentValues values = new ContentValues(); values.put(KEY_NOM, player.getNom_Player()); // Contact Name values.put(KEY_SURNOM, player.getSurnom_Player()); // Contact Phone values.put(KEY_AGE, player.getAge_Player()); // Contact Phone // Inserting Row db.insert(TABLE_PLAYERS, null, values); db.close(); // Closing database connection } public List&lt;Player&gt; getAllPlayers() { List&lt;Player&gt; playerList = new ArrayList&lt;Player&gt;(); // Select All Query String selectQuery = "SELECT * FROM " + TABLE_PLAYERS; SQLiteDatabase db = this.getWritableDatabase(); Cursor cursor = db.rawQuery(selectQuery, null); // looping through all rows and adding to list if (cursor.moveToFirst()) { do { Player player = new Player(); player.setCode_Player(Integer.parseInt(cursor.getString(0))); player.setNom_Player(cursor.getString(1)); player.setSurnom_Player(cursor.getString(2)); player.setAge_Player(Integer.parseInt(cursor.getString(3))); // Adding contact to list playerList.add(player); } while (cursor.moveToNext()); } // return contact list return playerList; } } </code></pre> <p>And here is the MainActivity class:</p> <pre><code>public class MainActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); TechAgrumeSQLiteHelper db=new TechAgrumeSQLiteHelper(this); //this.deleteDatabase("Player_Club.db"); // Inserting Contacts Log.d("Insert: ", "Inserting ................................................"); db.addPlayer(new Player("nom1", "prénom1",25)); db.addPlayer(new Player("nom2", "prénom2",24)); db.addPlayer(new Player("nom3", "prénom3",26)); db.addPlayer(new Player("nom4", "prénom4",16)); // Reading all contacts Log.d("Reading: ", "Reading all contacts.."); List&lt;Player&gt; player = db.getAllPlayers(); for (Player cn : player) { String log = "Id: "+cn.getCode_Player()+" ,Name: " + cn.getNom_Player() + " ,Phone: " + cn.getSurnom_Player()+" ,Age: "+cn.getAge_Player(); // Writing Contacts to log Log.d("Name: ", log);}} } </code></pre> <p>It gives me this error:</p> <pre><code>D/I'm here: ( 6548): I'm here!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! D/KeyguardViewMediator( 216): setHidden false D/Copy BD( 6548): database already exists!!!!!!!!!!!!!!!!!!!!!!!!!!!!! D/Insert: ( 6548): Inserting ................................................ I/SqliteDatabaseCpp( 6548): sqlite returned: error code = 1, msg = no such table: Player, db=/data/data/test.test.test/databases/webview.db E/SQLiteDatabase( 6548): Error during inserting E/SQLiteDatabase( 6548): android.database.sqlite.SQLiteException: no such table: Player: , while compiling: INSERT INTO Player(surnom_Player,nom_Player,age_Player) VALUES (?,?,?) </code></pre> <p>I went to look if the Player_Club.db really exists:</p> <pre><code> adb shell shell@android:/ $ run-as test.test.test run-as test.test.test &lt;a href="mailto:shell@android:/data/data/test.test.test"&gt;shell@android:/data/data/test.test.test&lt;/a&gt; $ cd /data/data/test.test.test/databases .test.test/databases &lt; &lt;a href="mailto:shell@android:/data/data/test.test.test"&gt;shell@android:/data/data/test.test.test&lt;/a&gt;/databases $ ls ls Player_Club.db webview.db webview.db-shm webview.db-wal </code></pre> <p>From these lines i can tell that the database really exists, so i don't know why it's looking for the Player table on the webview.db?</p>
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    1. COI would recommend switching to SQLiteAssetHelper: https://github.com/jgilfelt/android-sqlite-asset-helper
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    2. COwokring like a charm thanks
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