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POgetWritableDatabase()error on Sqlite
 

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  1. POgetWritableDatabase()error on Sqlite
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    <p>i want store some data into sqlite database, but error occurred on in my DBHandler and DBGen classes, i unable to find this error, i want to store username, password, confirm password, mobile number and email id.</p> <p><strong>UserDetailsDTO.java</strong></p> <pre><code>public class UserDetailsDTO { private String userName; private String password; private String confirmPassword; private String mobileNumber; private String emailId; public String getUserName(){ return userName; } public void setUserName(String userName){ this.userName = userName; } public String getPasssword(){ return password; } public void setPassword(String password){ this.password = password; } public String getConfirmPassword(){ return confirmPassword ; } public void setConfirmPassword(String confirmPassword){ this.confirmPassword = confirmPassword; } public String getMobileNumber(){ return mobileNumber; } public void setMobileNumber(String mobileNumber){ this.mobileNumber = mobileNumber; } public String getEmailId(){ return emailId; } public void setEmailId(String emailId){ this.emailId = emailId; } } </code></pre> <p><strong>DBGen.java</strong></p> <pre><code> public class DBGen { private Context ctx; //constants public final static int MODE_READ=0; public final static int MODE_WRITE=1; //SQLite Database private SQLiteDatabase myDB = null; private DBHelper dbHelper; private DBHandler dbHandler; private static boolean isClosed = false; private static DBGen dbGen = null; private DBGen(Context ctx, DBHandler dbHandler){ this.ctx=ctx; this.dbHandler=dbHandler; this.dbHelper = new DBHelper(ctx, dbHandler.getDatabase(), null, dbHandler.getVersion()); } public static DBGen getInstance(Context ctx, DBHandler dbHandler){ if(dbGen == null || isClosed){ dbGen = new DBGen(ctx, dbHandler); isClosed = false; } return dbGen; } public SQLiteDatabase open(int mode){ // To close the connection before opening a new one. if(myDB != null){ close(); } if(mode == MODE_WRITE){ myDB = dbHelper.getWritableDatabase(); } else{ myDB = dbHelper.getReadableDatabase(); } return myDB; } public SQLiteDatabase open(){ if((myDB == null)|| (! myDB.isOpen())){ myDB = dbHelper.getWritableDatabase(); } return myDB; } public boolean isDBExists(){ boolean isDBExist=false; try{ File dbPath=ctx.getDatabasePath(dbHandler.getDatabase()); isDBExist = dbPath.exists(); } catch(Exception e){ e.printStackTrace(); Log.e(dbHandler.getLogTag(),"ERROR DELETING THE FILE",e); } return isDBExist; } public boolean removeDB(){ boolean isDBClosed=removeHardDB(); return isDBClosed; } private boolean removeHardDB(){ boolean isDBdeleted = false; try{ File dbFilePath=ctx.getDatabasePath(dbHandler.getDatabase()); close(); isDBdeleted=dbFilePath.delete(); } catch(Exception e){ e.printStackTrace(); Log.e(dbHandler.getLogTag(),"EXCEPTION RAISED IN DELETING DB"); } return isDBdeleted; } public static void closeCursor(Cursor c){ if(c != null){ c.close(); } } public void close(){ isClosed = true; try{ myDB.close(); } catch(SQLException sqlex){ Log.e(dbHandler.getLogTag(),sqlex.getMessage(),sqlex); } try{ dbHelper.close(); } catch(SQLException sqlex){ Log.e(dbHandler.getLogTag(),sqlex.getMessage(),sqlex); } } class DBHelper extends SQLiteOpenHelper{ public DBHelper(Context context, String name, CursorFactory factory, int version) { super(context, name, factory, version); } @Override public void onCreate(SQLiteDatabase db) { dbHandler.onCreate(db); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { dbHandler.onUpgrade(db, oldVersion, newVersion); } } } </code></pre> <p><strong>DBHandler.java</strong></p> <pre><code>public abstract class DBHandler { private int version; private String database; private String logTag; private DBGen dbGen; @SuppressWarnings("unused") private DBHandler(){} public DBHandler(Context context, String database, int version, String logTag){ this.database=database; this.version=version; this.logTag=logTag; dbGen = DBGen.getInstance(context, this); } public String getDatabase() { return database; } public void setDatabase(String database) { this.database = database; } public int getVersion() { return version; } public void setVersion(int version) { this.version = version; } public String getLogTag() { return logTag; } public void setLogTag(String logTag) { this.logTag = logTag; } public SQLiteDatabase getReadDB(){ return dbGen.open(); } public SQLiteDatabase getWriteDB(){ return dbGen.open(); } public void close(){ try{ dbGen.close(); } catch(SQLException sqlEx){ Log.e(logTag, "Exception while closing connection",sqlEx); } } public abstract void onCreate(SQLiteDatabase db); public abstract void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion); } </code></pre> <p><strong>UserDBHandler.java</strong></p> <pre><code>public class UserDBHandler extends DBHandler { // DataBase Name public final static String DATABASE = "UserDetails"; // DataBase Table Name's public final static String USER_TABLE = "TABLE_USER"; // Field names of MALLS Table public static final String USER_NAME = "username"; public static final String PASSWORD = "password"; public static final String CONFIRM_PASSWORD = "confirmpassword"; public static final String USER_MOBILE_NUMBER = "mobilenumber"; public static final String USER_EMAIL = "email"; private String CREATE_TABLE_USER = "CREATE TABLE IF NOT EXISTS " + USER_TABLE+ " (" + USER_NAME + " VARCHAR," + PASSWORD + " VARCHAR," + CONFIRM_PASSWORD + " VARCHAR," + USER_MOBILE_NUMBER + " VARCHAR," + USER_EMAIL+ " VARCHAR," + ")"; public UserDBHandler(Context context) { super(context,DATABASE, Constants.DB_VERSION, Constants.TAG); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL(CREATE_TABLE_USER); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { try { onCreate(db); } catch (Exception e) { e.printStackTrace(); } } } UserDaoImlp.java public class UserDaoImpl implements UserDao{ private SQLiteDatabase myDB; private UserDBHandler dbHandler; private String TAG = "ItopperDaoImpl"; public UserDaoImpl(Context context){ dbHandler = new UserDBHandler(context); myDB = dbHandler.getWriteDB(); } @Override public void beginTransaction() { // TODO Auto-generated method stub myDB.beginTransaction(); } @Override public void setTransactionSuccessful() { // TODO Auto-generated method stub myDB.setTransactionSuccessful(); } @Override public void endTransaction() { // TODO Auto-generated method stub myDB.endTransaction(); } public long insertUserDetails(UserDetailsDTO userDetails) { ContentValues contentValues = new ContentValues(); contentValues.put(UserDBHandler.USER_NAME, userDetails.getUserName()); contentValues.put(UserDBHandler.PASSWORD, userDetails.getPasssword()); contentValues.put(UserDBHandler.CONFIRM_PASSWORD, userDetails.getConfirmPassword()); contentValues.put(UserDBHandler.USER_MOBILE_NUMBER,userDetails.getMobileNumber()); contentValues.put(UserDBHandler.USER_EMAIL,userDetails.getEmailId()); return myDB.insert(UserDBHandler.USER_TABLE, null, contentValues); } } </code></pre> <p><strong>StartActivity</strong></p> <pre><code> public class StartActivity extends Activity { private EditText userNameEdit,passwordEdit,confirmPasswordEdit,emailEdit,mobileNoEdit; private Button sbtButton; private Button cancelButton; private String userName; private String password; private String confirmPwd; private String mobileNo; private String email; private UserDaoImpl userDaoImpl; private Context mContext; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_start); userNameEdit = (EditText)findViewById(R.id.userNameedt); passwordEdit = (EditText)findViewById(R.id.paswordEdit); confirmPasswordEdit = (EditText)findViewById(R.id.confirmPaswordEdit); emailEdit = (EditText)findViewById(R.id.emailedt); mobileNoEdit = (EditText)findViewById(R.id.mobileNoedt); sbtButton = (Button)findViewById(R.id.submitbtn); cancelButton = (Button)findViewById(R.id.cancel); } @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); sbtButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub UserDetailsDTO userDetailsDto = new UserDetailsDTO(); userName = userNameEdit.getText().toString().trim(); password = passwordEdit.getText().toString().trim(); confirmPwd = confirmPasswordEdit.getText().toString().trim(); email = emailEdit.getText().toString().trim(); mobileNo = mobileNoEdit.getText().toString().trim(); userDetailsDto.setUserName(userName); userDetailsDto.setPassword(password); userDetailsDto.setConfirmPassword(confirmPwd); userDetailsDto.setMobileNumber(mobileNo); userDetailsDto.setEmailId(email); userDaoImpl = new UserDaoImpl(mContext); userDaoImpl.insertUserDetails(userDetailsDto); } }); } } </code></pre> <p><strong>Below is the LogCat specific problem code</strong></p> <p>12-31 12:09:17.749: E/AndroidRuntime(962): java.lang.NullPointerException 12-31 12:09:17.749: E/AndroidRuntime(962): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:157) 12-31 12:09:17.749: E/AndroidRuntime(962): at com.technowellservices.mobileuapp.database.DBGen.open(DBGen.java:63) 12-31 12:09:17.749: E/AndroidRuntime(962): at com.technowellservices.mobileuapp.database.DBHandler.getWriteDB(DBHandler.java:59) 12-31 12:09:17.749: E/AndroidRuntime(962): at com.technowellservices.mobileuapp.database.UserDaoImpl.(UserDaoImpl.java:20) 12-31 12:09:17.749: E/AndroidRuntime(962): at com.technowellservices.mobileuapp.Activities.StartActivity$1.onClick(StartActivity.java:70) 12-31 12:09:17.749: E/AndroidRuntime(962): at android.view.View.performClick(View.java:3480) 12-31 12:09:17.749: E/AndroidRuntime(962): at android.view.View$PerformClick.run(View.java:13983) 12-31 12:09:17.749: E/AndroidRuntime(962): at android.os.Handler.handleCallback(Handler.java:605) 12-31 12:09:17.749: E/AndroidRuntime(962): at android.os.Handler.dispatchMessage(Handler.java:92) 12-31 12:09:17.749: E/AndroidRuntime(962): at android.os.Looper.loop(Looper.java:137) 12-31 12:09:17.749: E/AndroidRuntime(962): at android.app.ActivityThread.main(ActivityThread.java:4340) 12-31 12:09:17.749: E/AndroidRuntime(962): at java.lang.reflect.Method.invokeNative(Native Method) 12-31 12:09:17.749: E/AndroidRuntime(962): at java.lang.reflect.Method.invoke(Method.java:511) 12-31 12:09:17.749: E/AndroidRuntime(962): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 12-31 12:09:17.749: E/AndroidRuntime(962): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 12-31 12:09:17.749: E/AndroidRuntime(962): at dalvik.system.NativeStart.main(Native Method)</p>
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