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Selectors in Objective-C?
First, I'm not sure I really understand what a selector is. From my understanding, it's the name of a method, and you can assign it to a class of type 'SEL' and then run methods such as respondToSelector to see if the receiver implements that method. Can someone offer up a better explanation?
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PostgreSQL ERROR: canceling statement due to conflict with recovery
...is not modified is to suspend the replication and resume after the query:
select pg_xlog_replay_pause(); -- suspend
select * from foo; -- your query
select pg_xlog_replay_resume(); --resume
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When would I use XML instead of SQL? [closed]
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Don't.
Try SELECT author FROM book
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Xcode - But… Where are our archives?
... (menu Window > Organizer)
Click on the Archives icon in the top middle
Select the desired archive by app name and date
Click Show in Finder in the context menu
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Apply multiple functions to multiple groupby columns
... group. When aggregating, g will be a Series. Passing g.index to df.ix[] selects the current group from df. I then test if column C is less than 0.5. The returned boolean series is passed to g[] which selects only those rows meeting the criteria.
In [95]: cust = lambda g: g[df.loc[g.index]['C']...
Amazon S3 direct file upload from client browser - private key disclosure
... using AWS Signature version 4.
Will summarize here:
As soon as the user selects a file to be uploaded, do the followings:
1. Make a call to the web server to initiate a service to generate required params
In this service, make a call to AWS IAM service to get temporary cred
Once you have the cr...
Can I have H2 autocreate a schema in an in-memory database?
...stmt = conn.createStatement();
ResultSet rset = stmt.executeQuery("select name from customer");
while (rset.next()) {
String name = rset.getString(1);
System.out.println(name);
}
}
}
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Oracle SQL Developer multiple table views
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SQL Developer can start a new tab every time you select a database object to view; but, you will have to close the tab manually.
Set this in:
Tools->Preferences->Database->ObjectViewer->Automatically Freeze Object Viewer Windows
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Rails Migration: Remove constraint
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This should be the selected answer
– nahtnam
Aug 9 '19 at 17:50
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Razor comment syntax
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In visual studio, select some code/markup in your razor view and press Ctrl+K, Ctrl+C, and it'll comment the selection as described above.
– MrBoJangles
Feb 17 '11 at 18:12
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