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Purge or recreate a Ruby on Rails database
...
I know two ways to do this:
This will reset your database and reload your current schema with all:
rake db:reset db:migrate
This will destroy your db and then create it and then migrate your current schema:
rake db:drop db:...
How to comment and uncomment blocks of code in the Office VBA Editor
...Comment Block entry onto the Menu Bar (yep! the menu bar)
Note: You should now see a new icon on the menu bar.
Make sure that the new icon is highlighted (it will have a black square around it) then
click Modify Selection button on the Customize dialog box.
An interesting menu will popup.
Under ...
Auto increment primary key in SQL Server Management Studio 2012
...nd your table right click on your table and select design from dropdown.
Now go Column properties below of it scroll down and find Identity Specification, expand it and you will find Is Identity make it Yes. Now choose Identity Increment right below of it give the value you want to increment in it...
Refresh image with a new one at the same url
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There is Date.now() for this
– vp_arth
Dec 24 '15 at 6:12
2
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ssh: Could not resolve hostname [hostname]: nodename nor servname provided, or not known
...rent for different routers though, so look up directions for your router.
Now, when I am outside of my home network I connect to my pi by typing:
ssh pi@[hostname]
Then I am able to input my password and connect.
sh...
How do I grep for all non-ASCII characters?
... no longer supports PCRE ("Perl-compatible regular expressions") as Darwin now uses BSD grep instead of GNU grep. An alternative to installing the dupes library is to install pcre instead: brew install pcre... as part of this, you will get the pcregrep utility, which you can use as follows: pcregrep...
Pad a number with leading zeros in JavaScript [duplicate]
...(str.length < length)
str = padString + str;
return str;
}
Now test:
var str = "5";
alert(str.lpad("0", 4)); //result "0005"
var str = "10"; // note this is string type
alert(str.lpad("0", 4)); //result "0010"
DEMO
In ECMAScript 8 , we have new method padStart and padEnd which ha...
How to create module-wide variables in Python? [duplicate]
...name.
Imagine a file called foo.py, containing this single line:
X = 1
Now imagine you import it.
import foo
print(foo.X) # prints 1
However, let's suppose you want to use one of your module-scope variables as a global inside a function, as in your example. Python's default is to assume tha...
How do I check for C++11 support?
...ler
#endif
It is set to 199711L in Visual Studio 2010 SP1, but I do not know if vendors will be so bold to increase it already if they just have (partial) compiler-level support versus a standard C++ library with all the C++11 changes.
So Boost's defines mentioned in another answer remain the onl...
How is the default max Java heap size determined?
... @PaoloFulgoni no, another practical example I observe right now: 129 Gbytes of physical memory results in 32 Gbyte of max heap size
– Kirill
Jan 29 '19 at 15:56
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