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Generating a random & unique 8 character string using MySQL
...'m working on a game which involves vehicles at some point. I have a MySQL table named "vehicles" containing the data about the vehicles, including the column "plate" which stores the License Plates for the vehicles.
...
What is the relative performance difference of if/else versus switch statement in Java?
...ere are more than two if/else blocks glued together or its size is unpredictable, then you may highly consider a switch statement.
Alternatively, you can also grab Polymorphism. First create some interface:
public interface Action {
void execute(String input);
}
And get hold of all implemen...
PG undefinedtable error relation users does not exist
...r, and upon my research, found out that one of the reasons for PG undefinedtable error relation users does not exist error is:
This error is a migration error. You may have created new model with some database attributes. After creating model you have to migrate attributes to your rails app schema....
How to return multiple lines JSX in another return statement in React?
...ed to return multiple <tr>s. I wrapped them in a <tbody> – a table is allowed to have multiple bodies.
EDIT: As of React 16.0, returning an array is apparently allowed again, as long as each element has a key: https://facebook.github.io/react/blog/2017/09/26/react-v16.0.html#new-rende...
How do I get the type of a variable?
...ot caterpillars. (When you create an database application to open variable tables from 'unknown' databases you need to control field type to variable scheme and vice vera in a 'very' dymanic way ;) )
– TomeeNS
Sep 20 '17 at 14:02
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Ruby on Rails: How do you add add zeros in front of a number if it's under 10?
...gt; sprintf '%02d', 10
=> "10"
You might want to reference the format table for sprintf in the future, but for this particular example '%02d' means to print an integer (d) taking up at least 2 characters (2) and left-padding with zeros instead of spaces (0).
...
How to connect to LocalDB in Visual Studio Server Explorer?
...e View menu, open SQL Server Object Explorer.
Right click on the {YourTableName} table > View Designer
Done.
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How do I put an 'if clause' in an SQL string?
...
You can use the multiple-table UPDATE syntax to effect an ANTI-JOIN between purchaseOrder and itemsOrdered:
UPDATE purchaseOrder p LEFT JOIN itemsOrdered i
ON p.purchaseOrder_ID = i.purchaseOrder_ID
AND i.status = 'PENDING'
SET p.purchaseO...
What version of javac built my jar?
...iszewski' https://stackoverflow.com/a/3313839/1497139 class number version table to create a bash script jarv to show the versions of all class files in a jar file.
usage
usage: ./jarv jarfile
-h|--help: show this usage
Example
jarv $Home/.m2/repository/log4j/log4j/1.2.17/log4j-1.2.17.jar
jav...
C#: List All Classes in Assembly
...is part of my data layer generated using a NetTeirs template. We have many tables.
– dyslexicanaboko
Mar 28 '14 at 18:24
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