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How to get data from a sqllite database and store it in ListView

I have a data base I need to read data from it and view it in a list view it contain some tables from them a table named "main_categories" which has one field called "category_name" which is the primary key
this is the DataAdapter:
public DataAdapter(Context context) {
this.mContext = context;
mDbHelper = new DataBaseHelper(mContext);
}
public DataAdapter createDatabase() throws SQLException {
try {
mDbHelper.createDataBase();
} catch (IOException mIOException) {
Log.e(TAG, mIOException.toString() + " UnableToCreateDatabase");
throw new Error("UnableToCreateDatabase");
}
return this;
}
public DataAdapter open() throws SQLException {
try {
mDbHelper.openDataBase();
mDbHelper.close();
mDb = mDbHelper.getReadableDatabase();
} catch (SQLException mSQLException) {
Log.e(TAG, "open >>" + mSQLException.toString());
throw mSQLException;
}
return this;
}
public void close() {
mDbHelper.close();
}
public Cursor getTestData() {
try {
String sql = "SELECT * FROM myTable";
Cursor mCur = mDb.rawQuery(sql, null);
if (mCur != null) {
mCur.moveToNext();
}
return mCur;
} catch (SQLException mSQLException) {
Log.e(TAG, "getTestData >>" + mSQLException.toString());
throw mSQLException;
}
}
}
and this is the DataBaseHelper:
public class DataBaseHelper extends SQLiteOpenHelper
{
private static String TAG = "DataBaseHelper"; // Tag just for the LogCat window
//destination path (location) of our database on device
private static String DB_PATH = "";
private static String DB_NAME ="my_knowledge";// Database name
private SQLiteDatabase mDataBase;
private final Context mContext;
public DataBaseHelper(Context context)
{
super(context, DB_NAME, null, 1);// 1? Its database Version
if(android.os.Build.VERSION.SDK_INT >= 17){
DB_PATH = context.getApplicationInfo().dataDir + "/databases/";
}
else
{
DB_PATH = context.getApplicationInfo().dataDir + "/databases/";
}
this.mContext = context;
}
public void createDataBase() throws IOException
{
//If the database does not exist, copy it from the assets.
boolean mDataBaseExist = checkDataBase();
if(!mDataBaseExist)
{
this.getReadableDatabase();
this.close();
try
{
//Copy the database from assests
copyDataBase();
Log.e(TAG, "createDatabase database created");
}
catch (IOException mIOException)
{
throw new Error("ErrorCopyingDataBase");
}
}
}
//Check that the database exists here: /data/data/your package/databases/Da Name
private boolean checkDataBase()
{
File dbFile = new File(DB_PATH + DB_NAME);
//Log.v("dbFile", dbFile + " "+ dbFile.exists());
return dbFile.exists();
}
//Copy the database from assets
private void copyDataBase() throws IOException
{
InputStream mInput = mContext.getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
OutputStream mOutput = new FileOutputStream(outFileName);
byte[] mBuffer = new byte[1024];
int mLength;
while ((mLength = mInput.read(mBuffer))>0)
{
mOutput.write(mBuffer, 0, mLength);
}
mOutput.flush();
mOutput.close();
mInput.close();
}
//Open the database, so we can query it
public boolean openDataBase() throws SQLException
{
String mPath = DB_PATH + DB_NAME;
//Log.v("mPath", mPath);
mDataBase = SQLiteDatabase.openDatabase(mPath, null, SQLiteDatabase.CREATE_IF_NECESSARY);
//mDataBase = SQLiteDatabase.openDatabase(mPath, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS);
return mDataBase != null;
}
#Override
public synchronized void close()
{
if(mDataBase != null)
mDataBase.close();
super.close();
}
#Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
}
#Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
}
}
and this is the main activity for now:
public class MainActivity extends AppCompatActivity {
SQLiteDatabase sqLiteDatabase;
private static String DB_NAME ="my_knowledge"; // Database name
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView list = findViewById(R.id.main_list);
DataAdapter mDbHelper = new DataAdapter(this);
mDbHelper.createDatabase();
mDbHelper.open();
Cursor testdata = mDbHelper.getTestData();
mDbHelper.close();
}
}
I want to know a way to store the data in the tables of the array (for example "main_categories") and view them with the list view

Depending on your table column type
List<String> temp;
testdata.moveToFirst();
do {
temp.add(testdata.getString(0));
} while (testdata.moveToNext());
Your cursor testdata has the first row in testdata.moveToFirst(); and each column is associated with column index i.e. 0, 1 etc.
testdata.moveToNext(); will have successive rows.

A couple of things:
First of, I would consider adding a query method to your DataBaseHelper class instead of using a rawQuery, something like:
Cursor query(String table, String[] projection, String where, String orderBy) {
return getReadableDatabase().query(table, projection, where, null, null, null, orderBy);
}
You can call the query method inside mDbHelper.getTestData() and use the Cursor object to populate your list.
Take a look at using a Cursor Loader?
to do get the data out of the cursor and into your adapter.

SQLite onUpgrade() frustration

I'm working with a prepopulated database. Using SQLite Manager in Mozilla, right now I have a dummy database and just wanted to test out the onUpgrade method, so I altered a string in one of the columns, exported it as a new database and as you'll see in my code, tried to open the newly updated version. Also important note, I'm updating the version number by one manually in the code
private static final int DB_VERSION = 3;
and in the onUpgrade
if (newVersion == 3) {
Log.e("WORKED!!", "onUpgrade executed");
so next time I would update these two numbers to 4. Not sure if I'm doing this right or what's wrong but I'm getting the log message, just not seeing the data updated in the app.
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteQueryBuilder;
import android.util.Log;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public class DataBaseHelper extends SQLiteOpenHelper {
private static String DB_PATH;
private static final String DB_NAME = "DummyTestOne.sqlite";
private static final int DB_VERSION = 3;
private static final String DB_NAME2 = "DummyTestFive.sqlite";
private SQLiteDatabase mDataBase;
private final Context mContext;
public static final String DBTABLENAME = "questiontable";
public static final String DBATABLENAME = "answertable";
public static final String COLUMN_ID = "_id";
public static final String COLUMN_NAME = "question";
public static final String COLUMN_CATEGORY = "category";
public static final String COLUMN_FID = "fid";
public static final String COLUMN_ANSWER = "answer";
public DataBaseHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
this.mContext = context;
DB_PATH = context.getDatabasePath(DB_NAME).getPath();
}
public void createDataBase() {
boolean dbExist = checkDataBase();
if (dbExist) {
} else {
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
try {
checkDB = SQLiteDatabase.openDatabase(DB_PATH, null, SQLiteDatabase.OPEN_READWRITE);
} catch (SQLiteException e) {
Log.e(this.getClass().toString(), "Error while checking db");
}
if (checkDB != null) {
checkDB.close();
}
return checkDB != null ? true : false;
}
private void copyDataBase() throws IOException {
InputStream externalDbStream = mContext.getAssets().open(DB_NAME);
OutputStream localDbStream = new FileOutputStream(DB_PATH);
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = externalDbStream.read(buffer)) > 0) {
localDbStream.write(buffer, 0, bytesRead);
}
localDbStream.flush();
localDbStream.close();
externalDbStream.close();
}
public void openDataBase() throws SQLException {
mDataBase = this.getWritableDatabase();
}
#Override
public synchronized void close() {
if (mDataBase != null) {
mDataBase.close();
}
super.close();
}
public Cursor getCursorForAllQs() {
SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
queryBuilder.setTables(DBTABLENAME);
String[] asColumnsToReturn = new String[]{COLUMN_ID, COLUMN_NAME, COLUMN_CATEGORY, COLUMN_FID};
Cursor mCursor = queryBuilder.query(mDataBase, asColumnsToReturn, null,
null, null, null, "_id");
return mCursor;
}
public List<String> getAnswersForQ(int questionFid) {
List<String> answers = new ArrayList<>();
SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
queryBuilder.setTables(DBATABLENAME);
String[] tableColumns = new String[]{DataBaseHelper.COLUMN_ANSWER};
String where = "fid = ?";
String[] selectionArgs = new String[]{String.valueOf(questionFid)};
String orderBy = DataBaseHelper.COLUMN_ID;
Cursor c = queryBuilder.query(mDataBase, tableColumns, where, selectionArgs, null, null, orderBy);
if (c.moveToFirst()) {
do {
try{
answers.add(c.getString(c.getColumnIndex(DataBaseHelper.COLUMN_ANSWER)));
} catch (Exception e) {
Log.e("FAILED", c.getString((c.getColumnIndex(DataBaseHelper.COLUMN_ANSWER))));
}
} while (c.moveToNext());
}
Log.d("getAnswersForQ", answers.toString());
return answers;
}
public String getName(Cursor c) {
return (c.getString(1));
}
#Override
public void onCreate(SQLiteDatabase db) {
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
if (newVersion == 3) {
Log.e("WORKED!!", "onUpgrade executed");
}
if (newVersion > oldVersion) {
InputStream inputStream = null;
OutputStream outputStream = null;
String dbFilePath = DB_PATH + DB_NAME;
try {
inputStream = mContext.getAssets().open(DB_NAME2);
outputStream = new FileOutputStream(dbFilePath);
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) > 0) {
outputStream.write(buffer, 0, length);
}
outputStream.flush();
outputStream.close();
inputStream.close();
} catch (IOException e) {
throw new Error("Problem copying database from resource file.");
}
}
}
}

Upgrading a database means changing it in place while keeping the old data intact as much as possible.
So if you want to add or rename a column, you have to execute the proper SQL command to do this in the onUpgrade callback.
(Note: SQLiteAssetHelper makes using a prepopulated database easier, and you should use it, but upgrading still needs a separate SQL script.)
If you do not care about the contents of the old database, then you should not upgrade it. Just give your new database version a new file name, so that it is simply copied over, and delete the old file.

Sqlite: Updating is done but on retreving, value returned is null

I'm using an existing database. For a table in that database, I'm updating a columns value of a particular row identified by 'chapter' and 'verse' by some user input(String). The updating is successful, however on retrieving the updated value it shows null.
FragmentFour.java
public class FragmentFour extends Fragment {
DataBaseHelper dbHelper;
#Override
public View onCreateView(final LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
......
dbHelper = new DataBaseHelper(getActivity());
......
}
public void someFunction(){
String notes = dbHelper.getNotes("SomeBookName",some_chapter,some_verse);
}
}
DataBaseHelper.java
public class DataBaseHelper extends SQLiteOpenHelper{
private static String TAG = "DataBaseHelper"; // Tag just for the LogCat window destination path (location) of our database on device
private static String DB_PATH = "";
private static String DB_NAME ="zypnt.sqlite";// Database name
private SQLiteDatabase mDataBase;
private final Context mContext;
public DataBaseHelper(Context context)
{
super(context, DB_NAME, null, 1);// 1? its Database Version
if(android.os.Build.VERSION.SDK_INT >= 17){
DB_PATH = context.getApplicationInfo().dataDir + "/databases/";
}
else
{
DB_PATH = "/data/data/" + context.getPackageName() + "/databases/";
}
this.mContext = context;
}
#Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
public void createDataBase() throws IOException
{
//If database not exists copy it from the assets
boolean mDataBaseExist = checkDataBase();
if(!mDataBaseExist)
{
this.getReadableDatabase();
this.close();
try
{
//Copy the database from assests
copyDataBase();
Log.e(TAG, "createDatabase database created");
}
catch (IOException mIOException)
{
throw new Error("ErrorCopyingDataBase");
}
}
}
//Check that the database exists here: /data/data/your package/databases/Da Name
private boolean checkDataBase()
{
File dbFile = new File(DB_PATH + DB_NAME);
//Log.v("dbFile", dbFile + " "+ dbFile.exists());
return dbFile.exists();
}
//Copy the database from assets
private void copyDataBase() throws IOException
{
InputStream mInput = mContext.getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
OutputStream mOutput = new FileOutputStream(outFileName);
byte[] mBuffer = new byte[1024];
int mLength;
while ((mLength = mInput.read(mBuffer))>0)
{
mOutput.write(mBuffer, 0, mLength);
}
mOutput.flush();
mOutput.close();
mInput.close();
}
//Open the database, so we can query it
public boolean openDataBase() throws SQLException
{
String mPath = DB_PATH + DB_NAME;
//Log.v("mPath", mPath);
mDataBase = SQLiteDatabase.openDatabase(mPath, null, SQLiteDatabase.CREATE_IF_NECESSARY);
//mDataBase = SQLiteDatabase.openDatabase(mPath, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS);
return mDataBase != null;
}
#Override
public synchronized void close()
{
if(mDataBase != null)
mDataBase.close();
super.close();
}
public String getNotes(String book,String chapter,String verse){
SQLiteDatabase mDb = this.getWritableDatabase();
String notes = "";
try{
Cursor c = mDb.rawQuery("SELECT footnotes FROM " + book + " WHERE chapter="+chapter+" and verse="+verse+"", null);
if(c.getCount()<=0)
return notes;
else {
c.moveToFirst();
notes = c.getString(0);
c.close();
}
} catch (Exception e) {
Log.e("getCrossReferences", e.getMessage());
}
mDb.close();
return notes;
}
public Boolean setNotes(String book,String chapter,String verse,String note){
SQLiteDatabase mDb = this.getWritableDatabase();
Boolean flag = false;
try{
Cursor c = mDb.rawQuery("UPDATE "+book+" SET footnotes='" + note + "' WHERE chapter="+chapter+" and verse="+verse+"", null);
c.close();
flag = true;
} catch (Exception e) {
Log.e("getCrossReferences", e.getMessage());
}
mDb.close();
return flag;
}
}

Try this change:
public Boolean setNotes(String book,String chapter,String verse,String note){
SQLiteDatabase mDb = this.getWritableDatabase();
Boolean flag = false;
try{
Cursor c = mDb.rawQuery("UPDATE "+book+" SET footnotes='" + note + "' WHERE chapter="+chapter+" and verse="+verse+"", null);
c.moveToFirst();
c.close();
flag = true;
} catch (Exception e) {
Log.e("getCrossReferences", e.getMessage());
}
mDb.close();
return flag;
}

Try this
if (c != null ) {
if (c.moveToFirst()) {
return c.getString(c.getColumnIndex("footnotes"));
}
}
c.close();

My Activity cannot be connected with my Database

I have an activity named Awal.java and the code :
public class Awal extends Activity implements OnItemClickListener {
private Cursor kategori;
private MyDatabase db;
private List<String> ktg;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
db = new MyDatabase(this, null);
ktg = db.getKategori();
String namaKtg[] = ktg.toArray(new String[ktg.size()]);
ListView listView = (ListView) findViewById(R.id.list);
listView.setAdapter(new ArrayAdapter<String>(this, R.layout.list, R.id.label, namaKtg));
listView.setOnItemClickListener(this);
}
#Override
protected void onDestroy() {
super.onDestroy();
kategori.close();
db.close();
}
public void onItemClick(AdapterView<?> adapter, View v, int pos, long l) {
Intent intent = new Intent(Awal.this,Detail.class);
intent.putExtra("namaKategori", adapter.getItemAtPosition(pos).toString());
startActivity(intent);
}
}
and also databaseHelper named MyDatabase.java and here is the code :
package com.mroring.belajarperancis;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class MyDatabase extends SQLiteOpenHelper {
// Variable declaration
private static String DB_PATH = "/data/data/com.mroring.belajarperancis/databases/";
public static String DB_NAME = "MY_DATABASE";
private final Context myContext;
private String strMypath;
public MyDatabase(Context context, String DB_NAME) {
super(context, DB_NAME, null, 1);
this.myContext = context;
try {
MyDatabase.DB_NAME = DB_NAME;
} catch (Exception e) {
e.printStackTrace();
}
}
public void createDatabase() throws IOException {
try {
// check if the database exists
boolean dbExist = checkDatabase();
if (!dbExist) {
// database is not present copy databse
this.getReadableDatabase();
try {
copyDatabse(DB_NAME);
} catch (IOException e) {
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 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() {
try {
File dbFile = new File(DB_PATH + DB_NAME);
return dbFile.exists();
} catch (Exception e) {
e.printStackTrace();
}
return 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.
* */
public void copyDatabse(String DB_NAME) throws IOException {
try {
// Open your local db as the input stream
Input`enter code here`Stream 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 * 2];
int length;
while ((length = myInput.read(buffer)) > 0) {
try {
myOutput.write(buffer, 0, length);
} catch (Exception e) {
}
}
if (myOutput != null) {
myOutput.flush();
myOutput.close();
}
if (myInput != null)
myInput.close();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* This function is used to open the database
*
* #throws SQLException
*/
public void openDatabase() throws SQLException {
SQLiteDatabase checkDB = null;
// Open the database
try {
strMypath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(strMypath, null,
SQLiteDatabase.OPEN_READWRITE);
} catch (Exception e) {
e.printStackTrace();
}
if (checkDB != null) {
checkDB.close();
}
}
public List<String> getKategori() {
String query = "SELECT _id FROM kategori";
List<String> kategori = new ArrayList<String>();
SQLiteDatabase db = getReadableDatabase();
Cursor cursor = db.rawQuery(query, null);
//looping through
if (cursor.moveToFirst()) {
do {
kategori.add(cursor.getString(0)); // add id & nama
}
while (cursor.moveToNext());
}
cursor.close();
db.close();
return kategori;
}
public List<List<String>> getDetail(String namaKategori) {
String query = "select pra, ina, baca from kata,kategori where kata.id_kategori=kategori._id and kategori.nama = '"+namaKategori+"'";
List<List<String>> detail = new ArrayList<List<String>>();
SQLiteDatabase db = getReadableDatabase();
Cursor cursor = db.rawQuery(query, null);
//looping
if (cursor.moveToFirst()) {
do {
List<String> item = new ArrayList<String>();
item.add(cursor.getString(0)); //add french word
item.add(cursor.getString(1)); //add indonesian word
item.add(cursor.getString(2)); //add baca
detail.add(item);
}
while (cursor.moveToNext());
}
cursor.close();
db.close();
return detail;
}
#Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
try {
copyDatabse(DB_NAME);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
}
And this combination always makes errors and here are the error :
06-18 01:23:01.694: E/AndroidRuntime(17219): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mroring.belajarperancis/com.mroring.belajarperancis.Awal}: android.database.sqlite.SQLiteException: no such table: kategori: , while compiling: SELECT _id FROM kategori
06-18 01:23:01.694: E/AndroidRuntime(17219): Caused by: android.database.sqlite.SQLiteException: no such table: kategori: , while compiling: SELECT _id FROM kategori
I have a database named 'MY_DATABASE' in .../BelajarPerancis/assets/databases/MY_DATABASE and also .../BelajarPerancis/assets/MY_DATABASE (I tried to put the DB in two places).
I have tried to pull the database from DDMS, and it returns the same Database with the same contents/tables and it has table 'Kategori'.
My 'Kategori' table contains the field of '_id' and here is the proof 3 Rows returned from: select nama from kategori; (took 5ms).

You are passing database name as null in line db = new MyDatabase(this, null);
I can not see code to create 'kategori' table
and in query you are trying to get data from table name as 'kategori' String query = "SELECT _id FROM kategori"; which do not exists..
Change db = new MyDatabase(this, null); to
db = new MyDatabase(this, "SOME_DATABASE_NAME");
and then write code to create table in database.
Activity launch is not working because db.getKategori(); is called from onCreate() method and which is throwing exception.
please go through http://www.vogella.com/tutorials/AndroidSQLite/article.html
Hope this helps you !!

Are you sure that you create the database?
I say that because you're using a absolute path to get the file of the database, the best thing to do in that case is create a database as the standard of Google.
here is a good answer, of how do that:
How do I create a database in android?
You can check too the name of your table, if you use with the first letter in uppercase you must use in that way all time.
att.

no such table SQLite error could not compile

i have three classes where the flow is..
entering the entry to be searched: (from MainActivity)
try {
String input = etSearch.getText().toString();
Intent i = new Intent(this, SearchViewList.class);
i.putExtra("input", input);
Log.i("input", input + "");
startActivity(i);
} catch (Exception e) {
// TODO: handle exception
String error = e.toString();
Dialog d = new Dialog(this);
d.setTitle("Row Empty or ID not found!");
TextView tv = new TextView(this);
tv.setText(error);
d.setContentView(tv);
d.show();
break;
}
then the class SearchViewList would display the list by the searched value from the intent
Intent i = getIntent();
input = i.getStringExtra("input");
String l = input;
datasource = new DatabaseHelper(this);
datasource.openDataBase();
List<Definition> values = datasource.getSearchedDefinition(l);
// use the SimpleCursorAdapter to show the
// elements in a ListView
ArrayAdapter<Definition> adapter = new ArrayAdapter<Definition>(this,
android.R.layout.simple_list_item_1, values);
setListAdapter(adapter);
ListView listView = getListView();
listView.setTextFilterEnabled(true);
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// When clicked, show a toast with the TextView text
Toast.makeText(getApplicationContext(),
((TextView) view).getText(), Toast.LENGTH_SHORT).show();
String str = ((TextView) view).getText().toString();
Log.i(str, str + "");
Intent i = new Intent(getApplicationContext(),
SearchedView.class);
i.putExtra("value", str);
startActivity(i);
}
});
then after clicking the searched entry from the list then the error commence
Intent i = getIntent();
l = i.getStringExtra("value");
TextView entry = (TextView) findViewById(R.id.tvEntry);
datasource = new DatabaseHelper(this);
datasource.openDataBase();
String dataEntry = datasource.getEntry(l);
datasource.close();
entry.setText(dataEntry);
}
here is my getEntry() method from the DatabaseHelper class
public String getEntry(String l) throws SQLException {
Cursor c = myDataBase.rawQuery(
"SELECT entry FROM defintionstbl where entry = '"
+ l + "'", null);
if (c != null) {
c.moveToFirst();
if (c.getCount() <= 0) {
return null;
}
String entry = c.getString(0);
return entry;
}
return null;
}
this next method is also from the DatabaseHelper class
public List<Definition> getSearchedDefinition(String l) throws SQLException {
List<Definition> entries = new ArrayList<Definition>();
Cursor cursor = myDataBase.rawQuery(
"SELECT entry FROM definitionstbl where entry like '" + l + "%'", null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
Definition entry = cursorToDefinition(cursor);
entries.add(entry);
cursor.moveToNext();
}
// make sure to close the cursor
cursor.close();
return entries;
}
private Definition cursorToDefinition(Cursor cursor) {
Definition entry = new Definition();
entry.setId(cursor.getLong(0));
entry.setEntry(cursor.getString(0));
return entry;
}
this method compile just fine but the i am getting a "no such table definitionstbl" error from the method getEntry().
additional note:
database = dictionary.sqlite
table = definitionstbl
column1 = _id
column2 = entry
column3 = definitions
here is the code for the copying of the database from an external source:
public class DatabaseHelper extends SQLiteOpenHelper {
// The Android's default system path of your application database.
private static String DB_PATH = "/data/data/com.gtxradeon.newversioncomputerdictionary/databases/";
private static String DB_NAME = "dictionary.sqlite";
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)) > 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) {
}
create table from MainActivity
try {
myDbHelper.createDataBase();
myDbHelperTrivia.createDataBase();
Log.i("CREATING", "DATABASE CREATED");
} catch (Exception e) {
Log.i("CREATE", "Exception Caught! ", e);
}
try {
myDbHelper.openDataBase();
Log.i("OPENING", "DATABASE OPENED");
} catch (SQLException e) {
Log.i("OPEN", "Exception Caught! ", e);
}

thanks for helping guys but i just changed the getEntry method to this.. rawQuery gave alot of error but this new method is good to go..
public String getEntry(String l) throws SQLException {
String[] columns = new String[] { "_id",
"entry", "definition" };
Cursor c = myDataBase.query("definitionstbl", columns,
"entry" + "='" + l + "'", null, null, null, null);
if (c != null) {
c.moveToFirst();
if (c.getCount() <= 0) {
return null;
}
String entry = c.getString(1);
return entry;
}
return null;
}