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Mastering Development

C++. I want to save a specific line of characters, that change, in a string

I run a command in CMD through my C++ app which saves the output from that command. In that output, there is a port number and a remote API token, that changes upon each restart of the application im targeting. This is the output I’m getting through my CMD command, which I store in a […]

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Mastering Development

Use a vanilla JavaScript package in React app

I am aiming to use a Vanilla JavaScript package in a more sophisticated React app to build additional logic around the JavaScript package. The JavaScript library is LabelStudio and docs can be found here: https://github.com/heartexlabs/label-studio-frontend However, when I try to import the LabelStudio I get an error saying Module not found: Can’t resolve ‘label-studio’ , […]

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Mastering Development

i am trying to make a histogram using animation.but it is not showing.thanx

#using animation library %matplotlib notebook import pandas as pd import numpy as np import matplotlib.animation as animation import matplotlib.pyplot as plt n=100 x=np.random.randn(n) def update(curr): if curr==n: a.event_source.stop() plt.cla() bins=np.arange(-4,4,0.5) plt.hist(x[:curr],bins=bins) plt.axis([-4,4,0,30]) plt.gca().set_title(‘sampling the normal distribution’) plt.gca.set_ylabel(‘frequency’) plt.gca().set_xlabel(‘value’) plt.annoate(‘n={}’.format(curr),[3,27]) fig=plt.figure() hist=plt.hist(x[0]) a=animation.FuncAnimation(fig,update,interval=100)

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Mastering Development

How to call `ON UPDATE CURRENT_TIMESTAMP()` without actually updating the row?

So, as things stand I have two tables related to this question List, with columns id, name, modified and Content, with columns id, listId, value When I change the values in Content (using either INSERT, UPDATE, or DELETE) I want the corresponding list’s modified value to update. I have set the modified column to have […]

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Database Development

Why is OLAP preferred more over OLTP while analyzing data in warehouse?

As per my understanding, OLTP is basically based on INSERT, UPDATE, DELETE commands, where as OLAP Based on SELECT command. And processing in OLTP is fast relative to OLAP, because UPDATE is faster than SELECT; JOINS in OLAP make this even slower, because of more memory movement. Keeping above in considerations, Then why is it […]

Categories
Database Development

Why is OLAP preferred more over OLTP while analyzing data in warehouse?

As per my understanding, OLTP is basically based on INSERT, UPDATE, DELETE commands, where as OLAP Based on SELECT command. And processing in OLTP is fast relative to OLAP, because UPDATE is faster than SELECT; JOINS in OLAP make this even slower, because of more memory movement. Keeping above in considerations, Then why is it […]

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Mastering Development

Nested routes – rails 5.2.4 – Undefined local variable or method

To register addresses for clients in my application I am using nested routes, however when clicking on the link to register a new address or to edit an existing address the system presents the error: undefined local variable or method `address’ for #<##Class:0x00007fd1c815fa58>:0x00007fd1d05ef598> Did you mean? @address. Can someone with a good heart inform me […]

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Database Development

Column name on NOT NULL constaint violation not shown

I’m using an Oracle 19 DB that is structured into multiple layers by using DB users. Here is a simplified overview of the structure: User DATA: Has the table XTEST and the view TEST. The view is created with a CREATE VIEW TEST AS SELECT * FROM XTEST statement, so it contains all columns of […]

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Mastering Development Software

Asserting against Fakes

If I have a IRepository that Create,Update,Delete and Get an entity from the database and I do a fake for it with a public List inside it. If I am testing a command that is using it: is a bad practice asserting to the list inside that Fake? If not, how this way of testing […]

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Mastering Development

Rails: param is missing or the value is empty: admin

I am working on a Rails project and I am using namespacing for the models and controllers. That is the child models are put in a directory called user and the controllers are put in a directory called users. For more clarity, I have a user model that has child admin and student models using […]