Why can a function modify some arguments as perceived by the caller, but not others?

I'm trying to understand Python's approach to variable scope. In this example, why is f() able to alter the value of x, as perceived within main(), but not the value of n? def f(n, x): n = 2 ...

SQL query date null check

I have the following stored procedure. ALTER PROCEDURE [dbo].[spList_Report] @id INT, @startDate DATETIME = NULL, @endDate DATETIME = NULL, @includeStatus1 BIT, @includeStatus2 BIT,...

Flask-SQLalchemy update a row's information

How can I update a row's information? For example I'd like to alter the name column of the row that has the id 5.

How to check if a Document Library (SPDocumentLibrary) supports a particular ContentType

I have a SharePoint 2010 site set up locally for debugging with the following topography: Main (SPSite) -> Toolbox (SPWeb) -> MyTool (SPWeb) I have created and deployed the following to...

How to concatenate result column values to a single row?

How to concatenate the result values into a single row? I created two tables like this. first table clientid name 1 test1 2 test2 3 test3 second table id clientid 3 1 3...

delete all lines from all tables of a database

Somebody must have already written a script to delete all lines from all tables of a database. Using DELETE command is not an option since it can takes ages on large tables. Of course there are...

Trigger in SQL Server - Get the type of Transaction done for Audit Table

I am writing trigger for inserting records into my Audit table. Whenever there is a change in data in my target table, the trigger will update the old value, new value to the audit...

'Create VIEW' must be the only statement in the batch

I have the following SQL: ALTER PROCEDURE [dbo].[usp_gettasks] @ID varchar(50) AS declare @PDate Date WHILE (DATEPART(DW, @PDate) = 1 OR DATEPART(DW, @PDate) = 7 ) ...

RewriteRule creating 500 Internal Server Error

I have the following in my .htaccess file: Options +FollowSymLinks RewriteEngine on RewriteRule ^directory/(.*)$ directory/index.php?id=$1 What I'm trying to achieve is this: When the URL...

Python XML Parsing without root

I wanted to parse a fairly huge xml-like file which doesn't have any root element. The format of the file is: <tag1> <tag2> </tag2> </tag1> <tag1> <tag3/> </tag1> What I tried: tried using...

Amazon S3 bucket returning 403 Forbidden

I've recently inherited a Rails app that uses S3 for storage of assets. I have transferred all assets to my S3 bucket with no issues. However, when I alter the app to point to the new bucket I get...

Error updating EDMX file

I've seen some other posts about this, but none of the answers seem to help. I'm trying to add a stored procedure to an EDMX. I open the diagram, right-mouse-click, and choose "Update Model from...

Flask + SqlAlchemy ALTER table

I'm developing a web application based on Flask + SqlAlchemy + MySQL and I followed that answer. I have to change my model so I need to alter the db table adding a column, but I don't want to lose...

postgresql logical replication - unable to drop subscription

While testing different scenarios, I run as advised: alter subscription mysub set (slot_name = NONE); drop subscription mysub; I get an error now: postgres=# select...

When is the __unaligned specifier used with pointers?

Background I'm currently working with variable length arrays with their length stored in the first two bytes of the element. Since the arrays are not padded, individual elements may be unaligned....

How to fix "Error executing DDL "alter table events drop foreign key FKg0mkvgsqn8584qoql6a2rxheq" via JDBC Statement"

I'm trying to start spring boot project with MySQL database, but I have some problem with database. I try to start my application that, and server is running but hibernate don't create Tables...

Android - Room how to add foreign key reference to data migration

I have updated one of my Room entities to include a foreign key. I must now include this change in my data migration but unsure on the SQL query. I've tried the following but it doesn't...

How to handle DateTime overflow in Dart / Flutter?

In a Flutter project I have an input form with a date picker. When a user picked a date, it is possible to alter the picked date by typing. I want to validate the form input and make sure the date...

How can I alter Node.js network permissions in Windows 10?

So, I was setting up node js to develop with React. A little windows permissions pop-up came up and asked if I wanted to allow node.js to operate on public or local networks. Its default was...

Understanding ThreadPoolExecutor with ThreadFactory in Java executors framework

Official API docs says: New threads are created using a ThreadFactory. If not otherwise specified, a Executors.defaultThreadFactory() is used, that creates threads to all be in the same...

React + Ionic 5: Tab navigation problems

I'm having trouble to get tabs navigation working properly. This is my code so far: App.tsx: const App: React.FC = () => <IonApp> <IonReactRouter> <IonRouterOutlet id="main"> ...

Cannot add or update a child row: a foreign key constraint fails - Laravel 7

I'm trying to add a relationship 1:1 between my Visitor & Contact <?php use Illuminate\Database\Migrations\Migration; use Illuminate\Database\Schema\Blueprint; use...

Postgres row level security insert returning

Given the following snippet from my schema: create table users ( id serial primary key, name text not null ); create table user_groups ( id serial primary key, name text not...

C declarator understanding

I am reading about declarators in C99 ISO Standard and I am struggling to understand the following passage: 5 If, in the declaration ”T D1”, D1 has the form     identifier then the type...

How can I change the appearance of axis labels in plot from ggpredict?

I am creating a plot using ggpredict and would like to alter the notation used for the y-axis labels (they are displayed using exponential+00 notation - it looks ugly). The code I am using looks...

NestJS/TypeORM. TypeORM doesn't update entity in DB, uses old cached entity instead

I am experiencing immense difficulties all day trying to save an entity into a MySQL database. I am using NestJS and TypeORM. teacher.entity.ts import { BeforeInsert, Column, Entity,...

Why does static_cast in the std::move() wipe value of argument?

My question contains two parts: Does function static_cast<Т>(arg) alter the innards of arg? Obviously not, according to such code: float i1 = 11.5; int x = static_cast<int>(i1); std::cout <<...

Using React, how to acheive basic Accordion that has css transitioning toggle (from fullHeight to 0px) (allowing height to remain dynamic / auto)

To transition the height from auto to 0 using just HTML, CSS had its own trials (css transitions do not work with auto values). I solved this using Javascript, by ... Step 1. Setting CSS transtion...

Acceptable way to get around a UNIQUE w NULL constraint?

I have a table as follows: I would like to add a UNIQUE KEY on (connection_id, parent_container_id, name). However, parent_container_id and connection_id are a disjoin union -- the record must...

Easy way of managing the recycling of C++ STL vectors of POD types

My application consists of calling dozens of functions millions of times. In each of those functions, one or a few temporary std::vector containers of POD (plain old data) types are initialized,...