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How to derive multiple classes from a single nib


How to derive multiple classes from a single nib

By : ItsYours
Date : November 22 2020, 10:33 AM
I wish this helpful for you Typically, a nib is used to instantiate an object whose code stands alone. The nib for objectX is not used within the code of objectX.
When SectionHeader is allocated, and its init called, it passes itself to the BaseSectionHeader version of the same method. But BaseSectionHeader drops that and creates a new object to put in self. Thus a SectionHeader is replaced with a BaseSectionHeader.
code :


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How to overcome need to derive from multiple classes when creating a custom control in WPF

How to overcome need to derive from multiple classes when creating a custom control in WPF


By : user2640347
Date : March 29 2020, 07:55 AM
wish helps you I vote for option 4. Composition seems to be a better option then inheritance in a long run. Later you will be able to replace you third-party control with something else without anybody from outside world knowing about the change. In other words you will encapsulate the dependency on the third-party control in your control.
extract superclass from multiple classes and derive from it

extract superclass from multiple classes and derive from it


By : Sneha Puthani
Date : March 29 2020, 07:55 AM
hope this fix your issue Run all of your unit tests and see that they pass Extract the base class from one of your classes. Call it BaseClass or something Run all of your unit tests ... Extract the base class from another of your classes. Call it BaseClass2 or something Run all of your unit tests... Compare BaseClass and BaseClass2 line for line. If they're not identical, then refactor them to make them identical. Frequently running all of your unit tests... Once they're identical, change all references to BaseClass2 to BaseClass Remove the unused BaseClass2 Run your unit tests...
Repeat as required.
How to derive a column based on multiple columns values for a single row

How to derive a column based on multiple columns values for a single row


By : supritha c
Date : March 29 2020, 07:55 AM
I wish this helpful for you I currently have an issue with a calculation I'm trying to create. , If your columns will have only 1,2 or 3 then you can try this
code :
case Col1 + Col2 + Col3 + Col4 + Col5 + Col6 + Col7 + Col8 When 8 Then 'Pass'
when 9 Then 'Borderline' 
Else 'Fail'
End
Oracle SQL - Derive multiple rows from column combination of single row

Oracle SQL - Derive multiple rows from column combination of single row


By : user2407052
Date : March 29 2020, 07:55 AM
this one helps. This is not a hierarchical query at all: you merely want to split each input row into two output rows and apply a little logic.
An easy way to perform the split is to CROSS JOIN your table to a row source that has exactly two rows.
code :
with input_data ( personId,  lastEvent, currentEvent, nextEvent) AS
(
SELECT 1, null, 1, 2     FROM DUAL UNION ALL
SELECT 1, 1,    2, 3     FROM DUAL UNION ALL
SELECT 1, 2,    3, 4     FROM DUAL UNION ALL
SELECT 1, 3,    4, null  FROM DUAL )
SELECT personId,
       decode(rn, 1, lastEvent, 2, currentEvent) event1,
       decode(rn, 1, currentEvent, 2, nextEvent) event2,
       currentEvent
from input_data 
CROSS JOIN ( SELECT rownum rn FROM DUAL CONNECT BY ROWNUM <= 2 ) r
ORDER BY personId, currentEvent, rn;
+----------+--------+--------+--------------+
| PERSONID | EVENT1 | EVENT2 | CURRENTEVENT |
+----------+--------+--------+--------------+
|        1 |        |      1 |            1 |
|        1 |      1 |      2 |            1 |
|        1 |      1 |      2 |            2 |
|        1 |      2 |      3 |            2 |
|        1 |      2 |      3 |            3 |
|        1 |      3 |      4 |            3 |
|        1 |      3 |      4 |            4 |
|        1 |      4 |        |            4 |
+----------+--------+--------+--------------+
Derive multiple columns from a single column in a Spark DataFrame

Derive multiple columns from a single column in a Spark DataFrame


By : Bambi Machelle Jarvi
Date : March 29 2020, 07:55 AM
it helps some times Generally speaking what you want is not directly possible. UDF can return only a single column at the time. There are two different ways you can overcome this limitation:
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