答案 0 :(得分:0)
尝试使用rawQuery或查询api而不是executeSQL,它不会返回任何类型的void类型。尝试类似:
String query = "SELECT COUNT(*) FROM USERDATA WHERE email = ?";
Cursor cursor = database.rawQuery(query, new String[] {e));
if (cursor != null && cursor.moveToFirst()) {
// do your stuff
}