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POAdd 2 column to sqlite db Android
 

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    <p>i can't add 2 column in my existing db. i read any topic on the web but i can't fix my problem. may i have a complete personalized answer to my problem? naturally i don't wanna lose existing record, just alter it! i want to add 2 column (phone (integer), automex (text)) to my db created in this way..</p> <pre><code>package com.ozzem.mybirthdaylite; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteDatabase.CursorFactory; import android.database.sqlite.SQLiteOpenHelper; public class dbMyBirthday { SQLiteDatabase db; private Context mContext; private DbHelper mDbHelper; private static final String DB_NAME="dbmyBirthday"; private static final int DB_VERSION=1; //costruttore crea anche il DbHelper public dbMyBirthday(Context ctx){ mContext=ctx; mDbHelper=new DbHelper(ctx, DB_NAME, null, DB_VERSION); } public void open(){ //il database su cui agiamo è leggibile/scrivibile db=mDbHelper.getWritableDatabase(); } public void close(){ //chiudiamo il database su cui agiamo db.close(); } public void deletePerson(int idDel){ //metodo per inserire i dati String where = "id = " + idDel; db.delete(Person.PERSON_TABLE, where,null); // Log.d("db_call", "Record of id["+idDel+"] deleted"); } public void insertPerson(long l,String name,String birthday){ //metodo per inserire i dati ContentValues cv=new ContentValues(); cv.put(Person.UID, l); cv.put(Person.NAME, name); cv.put(Person.BIRTHDAY, birthday); db.insert(Person.PERSON_TABLE, null, cv); // Log.d("db_call", "Record of uid["+uid+"] insered"); } public boolean exist(long uid){ boolean ex = false; Cursor c= db.rawQuery("SELECT COUNT(*) FROM " + Person.PERSON_TABLE + " WHERE uid = "+ "'" + uid + "'", null); c.moveToFirst(); int jcount = c.getInt(0); if (jcount &gt;0){ ex=true; } return ex; } public void updatePersonFromId(int id,String name,String birthday){ ContentValues cv=new ContentValues(); // cv.put(Person.UID, id); cv.put(Person.NAME, name); cv.put(Person.BIRTHDAY, birthday); String where = "id = " + "'"+id+"'"; db.update(Person.PERSON_TABLE, cv, where, null); // Log.d("db_call", "Record of id["+id+"] updated"); } public void updatePersonFromUid(long l,String name,String birthday){ ContentValues cv=new ContentValues(); cv.put(Person.UID, l); cv.put(Person.NAME, name); cv.put(Person.BIRTHDAY, birthday); String where = "uid = " + "'"+l+"'"; db.update(Person.PERSON_TABLE, cv, where, null); // Log.d("db_call", "Record of uid["+uid+"] updated"); } public Cursor fetchAllBirthday(){ //metodo per fare la query di tutti i dati // Log.d("db_call", "Fetching all birthdays"); return db.query(Person.PERSON_TABLE, null,null,null,null,null,null); } public static class Person { // i metadati della tabella, accessibili ovunque static final String PERSON_TABLE = "person"; static final String ID = "id"; static final String UID = "uid"; static final String NAME = "name"; public static final String BIRTHDAY = "birthday"; } private static final String PERSON_TABLE_CREATE = "CREATE TABLE IF NOT EXISTS " //codice sql di creazione della tabella + Person.PERSON_TABLE + " (" + Person.ID + " integer primary key autoincrement, " + Person.NAME + " text not null, " + Person.UID + " integer not null, " + Person.BIRTHDAY + " text not null );"; private class DbHelper extends SQLiteOpenHelper { //classe che ci aiuta nella creazione del db public DbHelper(Context context, String name, CursorFactory factory,int version) { super(context, name, factory, version); } @Override public void onCreate(SQLiteDatabase _db) { // TODO Auto-generated method stub _db.execSQL(PERSON_TABLE_CREATE); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { // TODO Auto-generated method stub } } } </code></pre>
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