CRUD

crud.java

@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
    int count;
    switch (uriMatcher.match(uri)) {
	case LOG_LIST:
		count = dbLogs.delete(TABLE_NAME, selection, selectionArgs);
		break;

	case LOG_ITEM:
		String segment = uri.getPathSegments().get(1);
		count = dbLogs.delete(TABLE_NAME,
			  KEY_ID + " = " + segment
         		  + (!TextUtils.isEmpty(selection) ? " AND (" + selection + ")" : "")
			  , selectionArgs);
		break;
		
	default: throw new IllegalArgumentException("Unsupported URI: " + uri);
    }
	
    getContext().getContentResolver().notifyChange(uri, null);
    return count;
}



@Override
public Uri insert(Uri uri, ContentValues values){
	long rowID = dbLogs.insert(TABLE_NAME, null, values); 
			
     if (rowID > 0)
     {
	 Uri result = ContentUris.withAppendedId(CONTENT_URI, rowID);
	 getContext().getContentResolver().notifyChange(result, null);
         return result;
     }
     throw new SQLException("Failed to insert row into " + uri);
}

@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
	int count;
    switch (uriMatcher.match(uri)) {
	case LOG_LIST:
    	    count = dbLogs.update(TABLE_NAME, values, selection, selectionArgs);
	break;

	case LOG_ITEM:
	    String segment = uri.getPathSegments().get(1);
	    count = dbLogs.update(TABLE_NAME,
	            values,
	            KEY_ID + " = " + segment
		    + (!TextUtils.isEmpty(selection) ? " AND (" + selection + ")" : "")
		    , selectionArgs);
	break;
		
	default: throw new IllegalArgumentException("Unsupported URI: " + uri);
    }
	
    getContext().getContentResolver().notifyChange(uri, null);
    return count;
}

@Override
public Cursor query(Uri uri, 
	 String[] projection, 
	 String selection,
         String[] selectionArgs, 
         String sortOrder) {
	
     SQLiteQueryBuilder builder = new SQLiteQueryBuilder();
     builder.setTables(TABLE_NAME);
	
     switch (uriMatcher.match(uri)) {
	case LOG_ITEM:
		builder.appendWhereEscapeString(KEY_ID + " = " + uri.getPathSegments().get(1));
	break;
     }

     Cursor cursor = builder.query(
		dbLogs, 
                projection, 
                selection, 
                selectionArgs, 
                null, null, sortOrder);
	
     // Register the contexts ContentResolver to be notified if
     // the cursor result set changes.
     cursor.setNotificationUri(getContext().getContentResolver(), uri);
	
     return cursor;
}