dimanche 19 avril 2015

Upgrade SQLite DataBase Android

I need to upgrade database, but just can not get it to work. I have looked at other question and tried different thing but did not managet to get it to work. Can someone please look at the code and help me.



import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;


public class DataBaseHelper extends SQLiteOpenHelper {


private static String DB_PATH = "/data/data/com.ribicinc.pogodi/databases/";

private static String DB_NAME = "baza.db";

private SQLiteDatabase myDataBase;

private final Context myContext;

private static final int DATABASE_VERSION = 2;

/**
*
*
* @param context
*/
public DataBaseHelper(Context context) {

super(context, DB_NAME, null, 2);
// if(android.os.Build.VERSION.SDK_INT >= 4.2){
// DB_PATH = context.getApplicationInfo().dataDir + "/databases/";
// } else {
// DB_PATH = "/data/data/" + context.getPackageName() + "/databases/";
// }
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 copying database");

}
}

}

/**
*
* @return
*/
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;
}


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) {
db.execSQL("DROP TABLE IF EXISTS vprasanja");
onCreate(db);
}


}

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