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Q&A

Welcome to Software Development on Codidact!

Will you help us build our independent community of developers helping developers? We're small and trying to grow. We welcome questions about all aspects of software development, from design to code to QA and more. Got questions? Got answers? Got code you'd like someone to review? Please join us.

General Q&A about programming, scripting, software design & architecture, process, tools, testing, and more.

Filters (None)
77%
+5 −0
Handling JSON files in Rust without manually creating mapping classes

I have JSON that looks something like this: {"id":"n-fsdf-6b6", "name":"JohnSmith", "revisionDate":1591072274000} The JSON data is named CharacterInfo. It comes from a static external URL. The str...

1 answer  ·  posted 3y ago by dustytrash‭  ·  last activity 3y ago by r~~‭

71%
+3 −0
How do I configure Jenkins to strip the leading “origin/” in git branch parameter?

I'm using Jenkins with a branch parameter to specify the branch to build from. Other stuff downstream needs the branch name to not have the leading "origin/" -- just "feature/blahblah" or "bugfix/1...

1 answer  ·  posted 3y ago by Monica Cellio‭  ·  last activity 3y ago by Monica Cellio‭

60%
+1 −0
What is the rationale of having Cascade as a DeleteAction in EntityFramework.Core?

I have noticed some time ago that Entity Framework assumes a CASCADE behaviour (implicit value, if not specified) for referential constraints (FKs) when deleting items. This means that by default, ...

1 answer  ·  posted 3y ago by Alexei‭  ·  last activity 3y ago by Alexei‭

66%
+2 −0
Will my implementation of a Spring Boot app work after being deployed on the Internet?

Say I want to implement a very basic group chat application. I use the H2 database, a user class, a controller, and a text file in the Resources folder that stores the chat texts. All texts would b...

1 answer  ·  posted 3y ago by sonofel‭  ·  last activity 3y ago by Moshi‭

81%
+7 −0
Why can't we mix increment operators like i++ with other operators?

I'm experimenting with different operators and have a hard time understanding the outcome of certain expressions. I try to combine the ++ operators with other operators such as assignment in the sa...

1 answer  ·  posted 3y ago by Lundin‭  ·  last activity 3y ago by Lundin‭

75%
+4 −0
Implementing impersonation in an ASP.NET Core Web application

I am working at a proof-of-concept for porting an ASP.NET MVC application to an ASP.NET Core API + Angular SPA. One of the features of the existing application is the ability of an admin (typically...

0 answers  ·  posted 3y ago by Alexei‭

71%
+3 −0
Keras model evaluate returns triggered tf.function retracing warning

I am training the following model using Keras as shown: model = tf.keras.models.Sequential([tf.keras.layers.Conv2D(64, (3,3), activation='relu', input_shape=(256, 256, 3)), tf.keras.layers.MaxPooli...

0 answers  ·  posted 3y ago by Guilherme Costa‭

77%
+5 −0
Search tree supporting efficient bulk sequential insert

For holding ordered sets of keys, there are well-known data structures (the red-black tree, for example) that support O(log(n)) lookup and insertion algorithms. Of course this means that there triv...

0 answers  ·  posted 3y ago by r~~‭  ·  edited 3y ago by r~~‭

75%
+4 −0
dig -6 works but dig -4 does not

I can't get a response from IPv4 dig on my server but I can get one from IPv6 dig. See the below output: $ dig +short myip.opendns.com a @resolver1.opendns.com # Doesn't return anything, this used ...

1 answer  ·  posted 3y ago by cobertos‭  ·  last activity 3y ago by Canina‭

70%
+5 −1
What do the number entries mean in the sympy poly.diff(...) tuple syntax?

I am looking to take a partial derivative of a sympy polynomial with respect to a symbol in the polynomial. In the sympy documentation for poly.diff(...) it gives sample code like this: from sympy ...

2 answers  ·  posted 3y ago by jrh‭  ·  last activity 3y ago by Derek Elkins‭

80%
+6 −0
Are generic enums completely abstract?

When using Result or Option to get a value, the value is wrapped in a Ok or Some. For example, with pattern matching to get a Result: let var: Json = match serde_json::from_str(&my_string) { ...

1 answer  ·  posted 3y ago by jla‭  ·  last activity 3y ago by Derek Elkins‭

75%
+4 −0
Is there an equivalent way of returning early in a MySQL stored procedure?

In programming instead of arrowcode where one has many layers of indented if statements, you can return a result as soon as possible. So instead of, if if end if end if It looks like if ret...

1 answer  ·  posted 3y ago by Charlie Brumbaugh‭  ·  edited 3y ago by Moshi‭

50%
+2 −2
Having trouble adding include directories

I'm trying to set up a simple test project, to unit test a change I'm working on. The change is to a file inside some existing project. I've tried to set up the includes as the original has it, but...

1 answer  ·  posted 3y ago by Hyperlynx‭  ·  last activity 3y ago by Hyperlynx‭

15%
+1 −14
What is the worst code you ever saw? [closed]

In the interest of learning from the mistakes of other people: What is the worst code you ever saw? What made it so bad?

1 answer  ·  posted 3y ago by meriton‭  ·  closed 3y ago by Mithical‭

60%
+1 −0
What is happening under the hood to the selected data in a MySQL cursor?

I have a number of MySQL stored procedures that use a cursor to go through a select and then pass the results to other stored procedures one row at a time. This can take a while to run, what is hap...

0 answers  ·  posted 3y ago by Charlie Brumbaugh‭  ·  edited 3y ago by Charlie Brumbaugh‭

83%
+8 −0
Is there a way to estimate the execution time of a statement in MySQL?

From time to time I will have large structural changes to make on my MySQL DB, things like adding columns, changing datatypes, adding indexes etc. These types of changes result in downtime and what...

1 answer  ·  posted 3y ago by Charlie Brumbaugh‭  ·  last activity 3y ago by meriton‭

86%
+11 −0
Can regex be used to check if input conforms to a very strict subset of HTML?

Tldr; I don't need to parse HTML, but I need to check if user submitted input conforms to a very strict subset of HTML. Can regex be a suitable tool for this? Details I have a frontend sanitiser th...

4 answers  ·  posted 4y ago by jla‭  ·  last activity 3y ago by Stephen C‭

83%
+8 −0
How can I define a method on [&mut T] where T: MyTrait?

I'm trying to make a trait method callable on mutable slices of a type implementing that trait (see main). Rust doesn't like me for it. use core::convert::AsMut; trait A { type B; fn f(m: ...

1 answer  ·  posted 4y ago by wizzwizz4‭  ·  last activity 3y ago by r~~‭

60%
+1 −0
In a stored procedure, is it possible to get the total number or rows updated by different statements?

I have a bunch of stored procedures that look like something this CREATE PROCEDURE example() BEGIN UPDATE STATEMENT A; UPDATE STATEMENT B; UPDATE STATEMENT C; END// When I run them thr...

2 answers  ·  posted 4y ago by Charlie Brumbaugh‭  ·  last activity 3y ago by Alexei‭

57%
+2 −1
How can I reduce the size of .svn folder?

Note: This question and its answer are an aggregate of the most up to date information about this topic from here. I have noticed that .svn folder has grown a lot and I want to reduce it. How can ...

1 answer  ·  posted 3y ago by Alexei‭  ·  edited 3y ago by r~~‭

66%
+2 −0
How to perform LINQ joins with multiple fields in a single join?

Note: this is an aggregate of the answer provided for this question. I want to get the LINQ equivalent of the following from SQL: SELECT .. FROM entity1 e1 JOIN entity2 e2 ON e1.field1 = e2.fie...

1 answer  ·  posted 3y ago by Alexei‭  ·  last activity 3y ago by Alexei‭

50%
+4 −4
Is concatenation a logical AND?

As a person with no significant background in mathematics and computer science I thought that concatenation and AND are logically identical if not very similar because both add something to somethi...

3 answers  ·  posted 4y ago by deleted user  ·  edited 3y ago by deleted user

71%
+3 −0
How long in days is a MONTH in MySQL?

If one finds where the past number of months equals the past number of days like this, select distinct DATE_SUB(now(), INTERVAL 92 DAY),DATE_SUB(now(), INTERVAL 3 MONTH) The numbers that are curre...

1 answer  ·  posted 3y ago by Charlie Brumbaugh‭  ·  last activity 3y ago by r~~‭

71%
+3 −0
connect with SLOT/SIGNAL: QPushButton clicked signal not received by main window

I added a QPushButton to my ui file named pushButton, and manually connected it using connect. There are no errors or warnings emitted at any point in the compilation stage The button does show up...

1 answer  ·  posted 4y ago by jrh‭  ·  last activity 3y ago by jrh‭

76%
+8 −1
Styling with classes vs styling with CSS

I've noticed that a lot of sites have something like this going on: <div class="has-margin-0 has-padding-4"> <div>...</div> <div>...</div> ... </div>...

1 answer  ·  posted 4y ago by Moshi‭  ·  last activity 4y ago by luap42‭

33%
+0 −2
How do I find all the tables in a database that don't have a specific column?

I need to add one column with the same name to all of the tables in my database, how can I find which tables don't currently have a column with that name?

1 answer  ·  posted 4y ago by Charlie Brumbaugh‭  ·  last activity 4y ago by Charlie Brumbaugh‭

80%
+6 −0
Is it recommended for ASP.NET Web API actions to always include a CancellationToken?

Note: This is basically a question from Stack Overflow that was closed for a very long period of time and I fear it might get closed again as primarily opinion based. I am wondering if my ASP.NET C...

1 answer  ·  posted 4y ago by Alexei‭  ·  last activity 4y ago by Peter Taylor‭

71%
+3 −0
Include a Blazor Webassembly project into an existing ASP.NET Core project

When creating a new Blazor Webassembly project, there is a checkbox ASP.NET Core hosted where if selected will create three projects at once, a blazor webassembly project, an ASP.NET Core project, ...

1 answer  ·  posted 4y ago by ndc‭  ·  last activity 4y ago by ndc‭

71%
+3 −0
What options can be set via swing.properties?

The default Swing look and feel can be set in $JAVA_HOME/conf/swing.properties What else can be set in this file? I can't find any other documentation of it.

1 answer  ·  posted 4y ago by ajv‭  ·  last activity 4y ago by Stephen C‭

66%
+2 −0
Nodejs wrap async function in synchronous function

I am writing a spoof of the fs module; the actual storage mechanism is not the the filesystem but rather a database. Overall, however, the api will function exactly like fs. So far my code is compa...

1 answer  ·  posted 4y ago by Gershy‭  ·  last activity 4y ago by Moshi‭

66%
+2 −0
How to protect the git respository for a public_html folder on a Linux server?

On a Linux server, if you leave the .git folder unprotected in the public_html folder, its possible that someone could download the folder and then gain access to your files. There are two ways I h...

2 answers  ·  posted 4y ago by Charlie Brumbaugh‭  ·  last activity 4y ago by .                                                .‭

66%
+2 −0
Validating xsd schema that contains import from external http source in Java 11

In the example.xsd file I have an import to an external xsd file that looks like this: <schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://test.example.com" ...

0 answers  ·  posted 4y ago by Janar‭  ·  edited 4y ago by Monica Cellio‭

83%
+8 −0
Should I cast to (void) when I do not use the return value

I saw at least one compiler (Codewarrior for HC12) warn me if I use a function without using it's return value. Other compilers (clang/gcc) do not issue a warning though, even when using the std=90...

3 answers  ·  posted 4y ago by Kami‭  ·  edited 4y ago by Monica Cellio‭

50%
+1 −1
How to temporarily disable a MySQL user?

Sometimes I will need to temporarily lock out other MySQL users when I am making large structure changes and want to make sure that nobody else is inputting or changing the data. The other use case...

2 answers  ·  posted 4y ago by Charlie Brumbaugh‭  ·  edited 4y ago by Charlie Brumbaugh‭

80%
+6 −0
How to store credentials for PHP scripts on a Windows machine?

I have a number of command line PHP scripts that are either run by a user or by Windows Task Scheduler. These scripts use DB and API credentials and I am wondering if there is a better way of stori...

1 answer  ·  posted 4y ago by Charlie Brumbaugh‭  ·  edited 4y ago by Charlie Brumbaugh‭

75%
+4 −0
Generate SIGSEGV without undefined behaviour.

In order to test that coredumps are generated and that they contain useful information which can be retreived with gdb I need to generate a SIGSEGV. Or anything else which causes a coredump. The co...

1 answer  ·  posted 4y ago by Estela‭  ·  last activity 4y ago by Lundin‭

60%
+1 −0
Access TypeScript class outside bundled code

I'm developing the design framework for a certain Q&A site. We are currently using an external dependency for the tag selector on the post editor, but it has some disadvantages (not fitting int...

1 answer  ·  posted 4y ago by luap42‭  ·  last activity 4y ago by ArtOfCode‭

84%
+9 −0
Why don't format specifiers work with lists, dictionaries and other objects?

When I want to print a number or a string, I can use f-strings (Python >= 3.6) or str.format, and I can use just the variable between braces, or use format specifiers. Ex: num, text = 10, 'abc' ...

1 answer  ·  posted 4y ago by hkotsubo‭  ·  edited 4y ago by sth‭

86%
+11 −0
What is undefined behavior and how does it work?

I have created this sensational program: #include <stdio.h> int* func (void) { int local=5; return &local; } int main (void) { printf("%d\n", *func()); } This prints 5 even thoug...

1 answer  ·  posted 4y ago by Lundin‭  ·  last activity 4y ago by Lundin‭

71%
+3 −0
Can renaming a MySQL column be sped up by dropping indexes or foreign keys?

I need to rename one column in 170 tables in a MySQL database and its going really slow. The columns all have an index plus a foreign key on them, would dropping the index/temporarily removing the...

2 answers  ·  posted 4y ago by Charlie Brumbaugh‭  ·  last activity 4y ago by manassehkatz‭

60%
+1 −0
How to upgrade a recent (>= 8) Angular CLI?

Angular CLI official page indicated how to install the CLI, but provides no information about how to upgrade it. I am interested in how to upgrade the CLI.

1 answer  ·  posted 4y ago by Alexei‭  ·  last activity 4y ago by Alexei‭

86%
+11 −0
Does using an Integer have any speed/performance benefits over a string in JSON

I'm working on an API to respond some data about a bunch of orders and items. The order and item numbers are always an integer (it's the order.id and item.id value, respectively). Originally the re...

3 answers  ·  posted 4y ago by Welz‭  ·  last activity 4y ago by .                                                .‭

80%
+6 −0
Is it undefined behaviour to just make a pointer point outside boundaries of an array without dereferencing it?

I have heard that it is undefined behaviour to make a pointer point outside boundaries of an array even without dereferencing it. Can that really be true? Consider this code: int main(void) { ...

2 answers  ·  posted 4y ago by klutt‭  ·  last activity 4y ago by hkotsubo‭

88%
+13 −0
Different behavior with relative imports when using flask vs py

I have a small new Python 3.8 Flask project with some relative import quirks. For the DB I use SQLAlchemy with Flask-Migrate. My project has the following general structure: controllers/ static/ te...

1 answer  ·  posted 4y ago by luap42‭  ·  last activity 4y ago by ajv‭