Databases
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    <p>Had the same problem, tried many solutions, finnaly i made an abstract method wich constructs the database structure and has extended class for the table classes.</p> <p>This is my Database constructor class and is Abstract:</p> <pre><code>public abstract class dbAdapter { public static String DATABASE_NAME = ""; public static final int DATABASE_VERSION = 1; public static final String DATABASE_TABLE1 = "ContactName"; public static final String DATABASE_TABLE2 = "PhoneNumber"; public static DbHelper ourHelper; public static Context ourContext; public static SQLiteDatabase ourDatabase; boolean ourConstructorBool = false; boolean ourDB = false; public static final String ContactNameTable = "CREATE TABLE "+DATABASE_TABLE1+" (" + ContactNameAdapter.KEY_ROWID+" INTEGER PRIMARY KEY AUTOINCREMENT, " + ContactNameAdapter.KEY_NAME+" TEXT, " + ContactNameAdapter.KEY_BIRTH_DATE+" TEXT);"; public static final String PhoneNumberTable = "CREATE TABLE "+DATABASE_TABLE2+" (" + PhoneNumberAdapter.KEY_NUMBER+" TEXT , " + PhoneNumberAdapter.KEY_DESCRIPTION+" TEXT, " + PhoneNumberAdapter.KEY_CONTACTID+" TEXT, " + "FOREIGN KEY(" + PhoneNumberAdapter.KEY_CONTACTID +") REFERENCES " + (ContactNameAdapter.DATABASE_TABLE)+"("+ContactNameAdapter.KEY_ROWID+") ON DELETE CASCADE"+ ");"; static class DbHelper extends SQLiteOpenHelper{ public DbHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL(ContactNameTable); db.execSQL(PhoneNumberTable); } @Override public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) { db.execSQL("DROP TABLE IF EXISTS " + ContactNameAdapter.DATABASE_TABLE); db.execSQL("DROP TABLE IF EXISTS " + PhoneNumberAdapter.DATABASE_TABLE); onCreate(db); } } public dbAdapter(Activity a){ if(!ourConstructorBool == true){ ourContext = a; DATABASE_NAME = a.getString(Asaf.com.contactsEX.R.string.DB_NAME); ourConstructorBool = true; } } public dbAdapter open() throws SQLException{ if(!ourDB == true){ ourHelper = new DbHelper(ourContext); ourDB = true; } ourDatabase = ourHelper.getWritableDatabase(); return this; } public void close(){ if(ourDatabase.isOpen()) ourHelper.close(); } } </code></pre> <p>And this is one of my table classes, the rest of the classes are implemented the same, just add as much as you like:</p> <pre><code>public class PhoneNumberAdapter extends dbAdapter{ public static final String KEY_NUMBER = "PhoneNumber"; public static final String KEY_DESCRIPTION = "Description"; public static final String KEY_CONTACTID = "ContactName_id"; public static final String DATABASE_TABLE = "PhoneNumber"; public PhoneNumberAdapter(Activity a){ super(a); } public long createEntry(String number, String description,long id){ // TODO Auto-generated method stub ContentValues cv = new ContentValues(); cv.put(KEY_NUMBER, number); cv.put(KEY_DESCRIPTION, description); cv.put(KEY_CONTACTID, id); return ourDatabase.insert(DATABASE_TABLE, null,cv); } } </code></pre> <p>Hope I helped.</p>
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    2. COHow can `ourConstructorBool` can be `true` if it is not declared as 'static'?
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