null Questions
33
Solved
Using Swift 1.1 and Xcode 6.2.
I have a UIStoryboard containing a singular, custom UIViewController subclass. On it, I have an @IBOutlet connection of type UIView from that controller to a UIView ...
Pia asked 28/3, 2015 at 19:9
9
Say I have a class with a member function; inside that method, I check this == nullptr, and if it is, return an error code.
If this is null, then that means the object is deleted. Is the method eve...
9
Solved
I am trying to find my current location for an android project. When the application is loaded my current location is always null. I have set up the permissions in the manifest etc. When I find the...
Bionics asked 26/3, 2012 at 13:38
2
Solved
In pandas, one can do:
import pandas as pd
d = {"foo":[1,2,3, None], "bar":[4,None, None, 6]}
df_pandas = pd.DataFrame.from_dict(d)
dict(df_pandas.isnull().sum())
[out]:
{'foo...
Crinite asked 10/5, 2023 at 14:26
5
Solved
I have a file with jsonlines and would like to find empty values.
{"name": "Color TV", "price": "1200", "available": ""}
{"name"...
29
Solved
We are frequently using the following code pattern in our JavaScript code
if (typeof(some_variable) != 'undefined' && some_variable != null)
{
// Do something with some_variable
}
Is th...
Beltran asked 1/4, 2010 at 9:17
4
I'm facing a similar problem with this question however VirtualizingStackPanel.IsVirtualizing="False" didn't solve my problem. Is there anyone facing the same issue?
The thing is I have a custom c...
Ewall asked 24/4, 2013 at 5:39
13
Solved
I got the above error in my app. Here is the original code
public string GetCustomerNumber(Guid id)
{
string accountNumber =
(string)DBSqlHelperFactory.ExecuteScalar(connectionStringSplendidmyA...
7
I am using Django for my website, and hence decided to use Django Rest Framework for building my REST APIs. For a particular model, i want to filter on a text field (using SearchFilter for that), f...
Tutelage asked 20/3, 2017 at 9:10
8
Solved
I need to check if the recipient username is in file /etc/passwd which contains all the users in my class, but I have tried a few different combinations of if statements and grep without success. T...
Wet asked 10/12, 2014 at 2:31
3
Solved
I got this error when tried to execute this:
#1064 - You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use
near 'NULL...
5
Solved
I have a query inside a stored procedure that sums some values inside a table:
SELECT SUM(columnA) FROM my_table WHERE columnB = 1 INTO res;
After this select I subtract res value with an intege...
Theodicy asked 24/7, 2013 at 16:1
7
I have this simple statement that works:
SELECT idnumber FROM dbo.database WHERE number = '9823474'
If the number does not exist anywhere in the table, it fails. I would like to add something to...
5
Solved
I was using HashMap before like
public Map<SocketChannel, UserProfile> clients = new HashMap<SocketChannel, UserProfile>();
now I've switched to ConcurrentHashMap to avoid synchron...
Kalamazoo asked 16/9, 2010 at 0:57
4
newbie question: how do i make my JSON output ignore null values? I don't want to necessarily set each individual property to ignore null (as in decorate each property with [JsonProperty(NullValueH...
4
Solved
I have a query like this (in a function):
UPDATE some_table SET
column_1 = param_1,
column_2 = param_2,
column_3 = param_3,
column_4 = param_4,
column_5 = param_5
WHERE id = some_id;
Where ...
Moline asked 9/11, 2012 at 10:2
2
Solved
When using set-variable I am seeing different behaviors when piping a null value to it.
In the first setup, we create a variable, and overwriting it with null, so far so good.
# Setup 1: Passing a ...
Keos asked 6/7, 2023 at 16:35
5
Solved
I want to do something like this:
df.replace('empty-value', None, 'NAME')
Basically, I want to replace some value with NULL, but it does not accept None as an argument. How can I do this?
Hale asked 27/4, 2016 at 18:8
11
I have some values in my database which can be null if they have not already been entered.
But when I use Thymeleaf in my html, it gives an error when parsing null values.
Is there any way to han...
3
Solved
In the Django admin changelist, how to show a blank space instead of the default "(None)"?
When a field is null in the database, Django inserts "(None)" to hold the place of the null when displaying a changelist. While descriptive, when there are lots of fields on a changelist, it makes ...
Gardia asked 27/1, 2015 at 16:9
3
Solved
I have a column of a pandas dataframe that I got from a database query with blank cells. The blank cells become "None" and I want to check if each of the rows is None:
In [325]: yes_records_sampl...
8
Solved
I am wanting to write a function that converts all instances of a property of any object that is null to undefined. Many of my objects have nested objects as properties or arrays of values/objects....
Wheelock asked 16/5, 2018 at 15:32
4
I have an API that set user settings. Because neither of inputs are mandatory I want to check first if the value exists and then set it to the model attributes in order to avoid null values.
$this...
4
Solved
I am trying to contol a buttons state depending on a relevant text box. The names are the same other than the prefixes. The text boxes and buttons are located in a table on the page.
<asp:Table...
Later asked 7/4, 2015 at 9:34
4
Solved
Is there a difference between NULL and null in PHP? Sometimes they seem to be interchangeable and sometimes not.
edit: for some reason when I read the documentation linked to in the answer (before...
© 2022 - 2024 — McMap. All rights reserved.