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Questions tagged [cascade]

Cascade refers to a table-definition keyword in relational databases; it instructs the query engine to take a certain action (delete, update), when a primary key is modified, on tables linked by a foreign key.

Cascade is a keyword that helps define the behavior of database tables linked by a foreign key, when the primary table is changed. If cascade is specified in the table definition, then, for example:

  • if a row in the primary table is deleted, the corresponding rows in the linked table can be deleted
  • if a primary key is updated, then the corresponding rows can be updated
1381 questions
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Database in BlackBerry 10

I want to learn database concept in BlackBerry 10 . I am referring BlackBerry's docs but didn't get the correct link . Can anyone give me link so that I can learn from it ?
Dhiraj Nangare
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cascade delete doesn't work

I have problem with Hibernate. My domains are Voucher, Offer, ExtraUser, Term and TermUserRegistration. They look like: @Entity(name = "Voucher") @Table(name = "extra_vouchers") public class Voucher implements Cloneable, Serializable{ with ID and…
Jan Bouchner
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Insert the list data at end of the groupdatamodel in blackberry 10 cascades?

I have a listview with groupdatamodel, i need to insert the list data at end of the groupdatamodel, Here i have pasted the code what i have done GroupDataModel { id: grouplistdatamodel …
SelvaRaman
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Having trouble with cv2 cascade

Here's my code: import cv2 as c face_cascade = c.CascadeClassifier(r"haracascade_frontalface.xml") img = c.imread(r"D:\cODE\Python_Only\CV2\Files\photo.jpg" ) grey_image = c.cvtColor(img , c.COLOR_BGR2GRAY) faces = face_cascade.detectMultiScale( …
Yatharth Saini 9A
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Nested while Loops is not working in python

My code is :- n = 6 i = 0 j = 0 while(i < n): while(j
Sujit Barwa
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How to save the detected object into a new image

I'm new in OpenCV. I'm trying to save the detected object into a new image. What should I do? This is the code I copied from a tutorial: import cv2 import numpy as np tric_cascade = cv2.CascadeClassifier('cascade.xml') img =…
sheena ocena
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Cascade DIVs like Windows

I'm looking for some JavaScript plugin or lib that can cascade my draggable divs like windows. I've been looking for a while, but haven't found it yet.
William Luis Alberton
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SQL Server Update Cascad Performance for Large Database Tables

I am looking for a solution for the database of my project. We have a database of around 70 tables and out of them there are 5-7 tables which have more than 30 million rows each. One of these huge table is a parent table and it has NVARCHAR primary…
Chetan
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Console in C++ Cascade for blackberry

I want to use console.log in my application to print output in console window, but the compiler reports this error Description Resource Path Location Type 'console' was not declared in this scope CalcolatorQML.cpp ‪/CalcolatorQML/src‬…
JustMe
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hibernate ignoring the cascade attribute

i'm using hibernate annotations in my project, I've created the tables and it's all good except that when i check the database their's no cascade even tho I've made sure to put it in the classes. here is an exemple of how i do it : public class Item…
nouraty
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On cascade in SQL/Oracle

How can I do on Update Cascade in Oracle? I read that this is not possible. It is allowed in mysql or plsql. But how can make the same in Oracle? example: create table section( id int not null primary key ); Create table student( id int not null…
Mehdi
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Opencv : No error in code , but webcam not showing in result

I am training out the tutorial in opencv. it had no error when compile. I know the code for the tutorial is for opencv2.4 and I had change the coding for cvquery and videoframe. My output is like this . My webcam is working fine but it not showing…
Daren li
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I want as small as possible code for creating a database and a table and storing a record then displaying all in qml cascade (BlackBerry)if possible

I want as small as possible code for creating a database and a table and storing a record then displaying all in Qml cascade (BlackBerry)if possible. please please explain in layman's terms. Thank you in advance
Uzair
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Making onClick event on Cascaded DIVs

I'm trying to do some cascading html DIVs but was not able yet. ======Concept====== 1 - How should it be at first: | ParentDiv | 2 - After user clicks on ParentDiv: | ParentDiv |     | ChildDiv1 | | ChildDiv2 | | ChildDiv3 | ======Concept…
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Cascading in SQL

Is there any way to cascade non-key attributes(not a primary key nor a foreign key) with the help of SQL? Is this possible?
Prakhar Jain
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