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What are the various “Build action” settings in Visual Studio project properties and what do they do
...
None: The file is not included in the project output group and is not compiled in the build process. An example is a text file that contains documentation, such as a Readme file.
Compile: The file is compiled into the build output. This setting is used for code files.
Content: ...
Performing user authentication in Java EE / JSF using j_security_check
...ealm-setup-with-glassfish-v3.html
Note: the post talks about a user and a group table in the database. I had a User class with a UserType enum attribute mapped via javax.persistence annotations to the database. I configured the realm with the same table for users and groups, using the userType colu...
How to make Regular expression into non-greedy?
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Though atomic groups can be used in place of possessive quantifiers, JavaScript does not support the atomic groups either. But there is a third alternative, see this: instanceof.me/post/52245507631/… - you can emulate atomic grouping wit...
Convert Rows to columns using 'Pivot' in SQL Server
...ECT ',' + QUOTENAME(Week)
from yt
group by Week
order by Week
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set @query = 'SELECT store,' + @cols + ' from
(
sel...
How to select only the records with the highest date in LINQ
...st date for each account, you'd use this:
var q = from n in table
group n by n.AccountId into g
select new {AccountId = g.Key, Date = g.Max(t=>t.Date)};
If you want the whole record:
var q = from n in table
group n by n.AccountId into g
select g.OrderByDescendi...
How to list active / open connections in Oracle?
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select status, count(1) as connectionCount from V$SESSION group by status;
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What is the purpose of the -nodes argument in openssl?
...ncryption
useful: lock down private.key
{ add HTTP server to ssl-cert group }
sudo chown root:ssl-cert private.key - change owner of private.key to root user, ssl-cert group
sudo chmod 640 private.key - change access permissions of private.key to owner R/W, group R
now, HTTP server should be a...
What is the purpose of setting a key in data.table?
...xtra column of type double is allocated).
When is setkey() required?
For grouping operations, setkey() was never an absolute requirement. That is, we can perform a cold-by or adhoc-by.
## "cold" by
require(data.table)
DT <- data.table(x=rep(1:5, each=2), y=1:10)
DT[, mean(y), by=x] # no key i...
GNU Makefile rule generating a few targets from a single source file
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After GNU Make 4.3 (19th Jan. 2020) you can use “grouped explicit targets”. Replace : with &:.
file-a.out file-b.out &: input.in
foo-bin input.in file-a.out file-b.out
The NEWS file of the GNU Make says:
New feature: Grouped explicit targets
Pattern rules ha...
Extract substring using regexp in plain bash
... any space characters (any whitespace character)
\( start capture group
\S* any non-space characters
\) end capture group
.*$ anything at the end
\1 substitute 1st capture group for everything on line
p print it
...