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Using OR in SQLAlchemy
...ed through the docs and I cant seem to find out how to do an OR query in SQLAlchemy. I just want to do this query.
4 Answ...
delete_all vs destroy_all?
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delete_all is a single SQL DELETE statement and nothing more. destroy_all calls destroy() on all matching results of :conditions (if you have one) which could be at least NUM_OF_RESULTS SQL statements.
If you have to do something drastic such as...
Exact difference between CharSequence and String in java [duplicate]
...escaping. This would make writing embedded code strings such as HTML, XML, SQL, or JSON much more convenient.
To quote JEP 378:
A text block is a multi-line string literal that avoids the need for most escape sequences, automatically formats the string in a predictable way, and gives the develo...
Finding all cycles in a directed graph
...To find a valid route, it depends on your data structure. For me it was a sql table full of valid route possibilities so I had to build a query to get the valid destinations given a source.
Problem 2)
Push each node as you find them into a collection as you get them, this means that you can see if...
How to expand/collapse a diff sections in Vimdiff?
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set vimdiff to ignore case
Having started vim diff with
gvim -d main.sql backup.sql &
I find that annoyingly one file has MySQL keywords in lowercase the other uppercase showing differences on practically every other line
:set diffopt+=icase
this updates the screen dynamically & y...
Can JavaScript connect with MySQL?
Can JavaScript connect with MySQL? If so, how?
18 Answers
18
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How do ACID and database transactions work?
...p between ACID and database transaction?
In a relational database, every SQL statement must execute in the scope of a transaction.
Without defining the transaction boundaries explicitly, the database is going to use an implicit transaction which is wraps around every individual statement.
The ...
Returning null as an int permitted with ternary operator but not if statement
...llowing:
long millis = System.currentTimeMillis();
return(true ? new java.sql.Timestamp(millis) : new java.sql.Time(millis));
You'll notice that resulting type of the conditional expression is java.util.Date since it's the "Least Common Superclass" for the Timestamp/Time pair.
Since null can be ...
What's the recommended approach to resetting migration history using Django South?
... --delete-ghost-migrations on the live deployment server followed by a [my]sqldump. Then pipe that dump into [my]sql on the environments where you need the migrated, fully-populated db. South sacrilege, I know, but worked for me.
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Best practice: PHP Magic Methods __set and __get [duplicate]
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Your final line is my philosophy: Let PHP be PHP, let SQL be SQL, let Javascript be Javascript, let HTML be HTML, let Java, C#, or your chosen language be what it is and operate how it's designed to operate. Inherent in that is that it's mainly effective when your team knows ho...