@Override
public Cursor query(
Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
switch (uriMatcher.match(uri)) {
case TEMP_MATTERS:
qb.setTables(TempMatterTable.TABLE_NAME);
qb.setProjectionMap(tempMatterProjectionMap);
break;
case TEMP_MATTER_ID:
qb.setTables(TempMatterTable.TABLE_NAME);
qb.setProjectionMap(tempMatterProjectionMap);
qb.appendWhere(TempMatterTable._ID + "=" + uri.getPathSegments().get(1));
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
String orderBy;
if (TextUtils.isEmpty(sortOrder)) {
orderBy = TempMatterTable.DEFAULT_SORT_ORDER;
} else {
orderBy = sortOrder;
}
SQLiteDatabase db = dbHelper.getReadableDatabase();
Cursor c = qb.query(db, projection, selection, selectionArgs, null, null, orderBy);
// 为Cursor对象注册一个观察数据变化的URI
c.setNotificationUri(getContext().getContentResolver(), uri);
return c;
}
@Override
public Cursor query(
Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
SQLiteDatabase db = dbHelper.getReadableDatabase();
Cursor cursor = null;
switch (uriMatcher.match(uri)) {
case BOOK_DIR:
cursor = db.query("Book", projection, selection, selectionArgs, null, null, sortOrder);
break;
case BOOK_ITEM:
String bookId = uri.getPathSegments().get(1);
cursor =
db.query("Book", projection, "id = ?", new String[] {bookId}, null, null, sortOrder);
break;
case CATEGORY_DIR:
cursor = db.query("Category", projection, selection, selectionArgs, null, null, sortOrder);
break;
case CATEGORY_ITEM:
String categoryId = uri.getPathSegments().get(1);
cursor =
db.query(
"Category", projection, "id = ?", new String[] {categoryId}, null, null, sortOrder);
break;
default:
break;
}
return cursor;
}
public SampleDBManager openReadable() {
db = DBHelper.getReadableDatabase();
return this;
} // end openReadable