General Q&A about programming, scripting, software design & architecture, process, tools, testing, and more.
Its possible to execute a MySQL file from the command line like so, mysql -u USER -pPASSWORD < FILENAME which triggers a warning, mysql: [Warning] Using a password on the command line int...
Background I can see the need to use {} when implementing a function-like macro such as this one: #define HCF(code) fprintf(stderr, "halt and catch fire"); exit(code); Because if we use the fo...
I have line-based data on the form x1=y2; a3=b4; c5=d6; ... Matching this with a extended regular expression is fairly straightforward; for example, one can do something not entirely dissimilar...
Someone told me that I shouldn't write "NULL pointer" with capital letters, because a null pointer and NULL are different terms. And that NULL is a "null pointer constant". What's the meaning of th...
The Problem I have a path optimization problem that in some ways reminds me of the Traveling Salesman Problem, but differs in some key respects. I have a group of items that need to be used by a m...
Answers to Excel - Get only values from column that are not Zero “0” asked by @CiscoNewb includes ones applying AGGREGATE: =IFERROR(INDEX(A:A,AGGREGATE(15,6,ROW(A$2:A$12)/(A$2:A$12>0),ROW(A1)))...
I have recently contributed to a Clean Code project and had a discussion about how to implement unit tests. The project author argues for using an in-memory database (which easily replaces the rea...
I have a big Cypher query that is depending on a variable. Example: With REGION = 'Canada' query I want to execute this query several times based on different values on a list and return the UN...
To protect against dictionary and rainbow table attacks it is well known that passwords should be salted before hashing. The salt (unique to each password) gets stored with the hash, often in the s...
Using the below graph as an example: I am trying to determine all Persons which are_sons of Persons all born in the same country. Is there an elegant way to achieve this with Cypher?
In a stored procedure let's say I have a VARCHAR variable, DECLARE example_variable VARCHAR(100); how much memory is allocated to it and is that independent of the length of the data in the var...
Is there any guarantee regarding initialization of static and thread_local objects? In example, is there any guarantee about the value printed by the following program? #include<iostream> s...
When writing Python-based apps (e.g. Django, Flask, etc.), it's often the case that import statements can be found all over the place, often more than once for the same module. For example, you can...
I have decided to convert a legacy database-first ASP.NET Core project to code-first. However, I have noticed that the project used the same database as another bigger project and the Entity Framew...
When discussing best or safest C programming practices with various C gurus on the Internet, the "MISRA-C guidelines for the use of C language in critical systems" often pops up as a source. This ...
I do a lot of rebasing and amending of my topic branches. I don't think it's especially useful for me or my colleagues to see in the logs what date it was when I first started working on the partic...
Summary/Context I'm currently working to improve performance and throughput of our automation infrastructure, most of which is a combination of Bash/Shell scripts, Python scripts, Docker, Jenkins,...
Lets say I have two tables, A and B and I need to join a subset of them. Is there best practices of sticking the conditions in the WHERE clause like this, SELECT * FROM A JOIN B on a.fk_b = b....
Due to a series of unfortunate events I have some tables where the auto_increment value got behind what it should be. If the auto_increment value is 9 and there are 20 rows in the table the next 1...
In PHP one can either use include or require to include files, the difference is that if the file doesn't exist it will emit a fatal error and halt with a require and only emit a warning with inclu...
I have a PHP program that does a SELECT and then updates some of the values based on an algorithm. Rather than updating one row at a time UPDATE example_table SET COLUMN_A = 1 WHERE primary_k...
Microsoft.Build.Evaluation.Project seems to have some rather odd ideas of what values to use when loading projects. In particular, I have a number of projects with the following dependency: <Pa...
I have a very large table that I need to iterate through with a PHP script and I can't do all of the results at once so I do it in sections with a LIMIT like for ($x = 0; $x < 10000000; $x += 1...
I am interested in performing a LEFT JOIN using LINQ-2-SQL when working with method call notation. This answer suggests a way that relies on GroupJoin but it is more verbose than expected: var le...
So I had a table with a primary key and a bunch of different columns. Columns A, B, and C were all unsigned ints (like the primary key column) and each column had a unique constraint I dropped the...
I have tables A and B and then I have a many to many join table with foreign keys to both called a_b. Neither foreign key can be null and the combinations for the foreign keys to A and B are unique...
I have a couple of 3d example projects in gcode for my printer but the printer bed has a couple of bumps in the center (where things are printed by default) and in order to print the objects I woul...
I need to drop all of the stored procedures from my MySQL database before I recreate them. How can I do so?
I have added Swagger UI for an ASP.NET Core 3.1 application and I have realized that all endpoints requiring Windows Authentication fail. This issue is created by the fact that generated HTTP reque...
I have a query that returns the owner of jobs on an SQL instance, select s.name as JobName , s.owner_sid , ISNULL(L.name,'AccessViaGroup') as LoginName --Trying to figure out how to turn that ...
In Dyalog APL, there's a predefined function in the dfns library to generate a matrix of permutations for a list of the numbers from 1 to n. I want to create the same functionality, except that it...
My project has the following set up for the production and preproduction ("clone") environment. Production is not accessible at all for the development team, only the preproduction database. Pr...
I am working on an Angular application using ngrx and I have a loader state + reducer that is used to display a loader. However, very short AJAX calls cause a flicker and I need to delay showing th...
I'm trying to create an encrypted¹ zip archive using bsdtar. Here's where I got stuck: bsdtar -c --options='zip:encryption' --passphrase "secret" -f test.zip test This is the error I get: bs...
I have a function that which does some calculations. I would like to assign the result of the function to the global environment from within the function, how do I proceed? A minimal example: meanF...
Let's say I have a script that needs the user to set X number of variables at the start. One can either Pass the arguments in on the command line. Start the program and then have the user input th...
Currently, we have a CRUD plus reporting application that talks to one MySQL database. Intermittently users will report locks when searching, currently, I can only get the approximate time of when ...
Almost every table in my DB has triggers that fire on INSERT, UPDATE, DELETE and write the changes to a separate read only DB. This makes it possible to track changes and undo things well after the...
Which concept is best for managed background services? 1. RunAsync(CancellationToken): interface IWorker { Task RunAsync(CancellationToken cancellationToken = default); } ... IWorker worker =...
Can a Go package name validly contain a hyphen and/or an underscore? The godocs say that By convention, packages are given lower case, single-word names; there should be no need for underscores or...
I understand that any World Wide Web interaction works this way: Stage 1: Client (human or software) ⟶ User agent ⟶ HTTP/S web-server request (with an unresolved domain) Stage 2: ISP-initiated Rou...
I recently encountered a strange situation in javascript; if I have: let obj = { a: function() { return (this === obj) ? this.b : 'bye'; }, b: 'hello' }; I can call obj.a with this bound...
I was told by my professor/book that computer programs use two kinds of memory and that all variables get allocated either on the stack or on the heap. Is this true? How can I tell where a variable...
I found a confusing construction in several stored procs in an MS SQL 2008 R2 database: DATEADD(dd, 0, DATEDIFF(dd, 0, some_date)) As I understand it, these are the relevant function signatures: D...
Why SDL (the Simple Directmedia Layer) apps are showing in a single quarter of the window, while the other three are blacked out, and what can I do about it? I'm using Xcode. I think this started h...
One of the fonts available (to me) on Google Docs is Caveat. The following is in 18-point Caveat on Google Docs: I found that Caveat is available at https://github.com/googlefonts/caveat/tree/ma...
I want to use LazyCache and UnityContainer together in an ASP.NET classic application (.NET framework 4.6.1+). Namely, to be able to inject IAppCache in various services. For ASP.NET Core and its d...
If one is using SASS to build a websites CSS and using version control one can either, Keep both the SASS and the resulting CSS files in version control. Only storing the SASS files in version con...
I am considering either removing some columns or changing the datatypes if I could significantly reduce the amount of storage that is currently used by those columns. Some of the columns are ints a...
I have a database with quite a few VARCHAR fields. When the database was first built the lengths of the columns were set a bit larger than absolutely necessary. Now after, having used the DB for a ...
