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How do you create a random string that's suitable for a session ID in PostgreSQL?
...ndom_string(length integer) returns text as
$$
declare
chars text[] := '{0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z}';
result text := '';
i integer := 0;
begin
if length < 0 then
raise exception 'Given le...
How to use the same C++ code for Android and iOS?
...ring("Unix");
std::cout << textFromCppCore << '\n';
return 0;
}
To build the code, you need to execute:
$ g++ Main.cpp Core.cpp -o main
$ ./main
cpp says hello to Unix
iOS
It is time to implement on the mobile side. As far as iOS has a simple integration we are starting with i...
Default constructor vs. inline field initialization
...
answered Feb 6 '11 at 23:00
davindavin
39.4k77 gold badges7070 silver badges7777 bronze badges
...
TCP 的那些事儿（下） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...效。 听起来似乎很简单，好像就是在发送端发包时记下t0，然后接收端再把这个ack回来时再记一个t1，于是RTT = t1 – t0。没那么简单，这只是一个采样，不能代表普遍情况。
经典算法
RFC793 中定义的经典算法是这样的：
1...
Select n random rows from SQL Server table
I've got a SQL Server table with about 50,000 rows in it. I want to select about 5,000 of those rows at random. I've thought of a complicated way, creating a temp table with a "random number" column, copying my table into that, looping through the temp table and updating each row with RAND() , and ...
How to push both value and key into PHP array
...
answered Jan 23 '10 at 0:45
PekkaPekka
408k128128 gold badges907907 silver badges10481048 bronze badges
...
Renaming files in a folder to sequential numbers
... let, and printf for the padding:
a=1
for i in *.jpg; do
new=$(printf "%04d.jpg" "$a") #04 pad to length of 4
mv -i -- "$i" "$new"
let a=a+1
done
using the -i flag prevents automatically overwriting existing files.
...
Stretch background image css?
...nd-size: cover;
}
Works in:
Safari 3+
Chrome Whatever+
IE 9+
Opera 10+ (Opera 9.5 supported background-size but not the keywords)
Firefox 3.6+ (Firefox 4 supports non-vendor prefixed version)
In addition you can try this for an IE solution
filter: progid:DXImageTransform.Microsoft.AlphaIma...
Show Youtube video source into HTML5 video tag?
...irplay="allow"
data-youtube-id="N9oxmRT2YWw"
src="http://v20.lscache8.c.youtube.com/videoplayback?sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Cratebypass%2Coc%3AU0hPRVRMVV9FSkNOOV9MRllD&amp;itag=43&amp;ipbits=0&amp;signature=D2BCBE2F115E68C5FF97673F1D797F3C3E3BFB99.59252109...
How to “warm-up” Entity Framework? When does it get “cold”?
...
+100
What would be the best approach to have high availability on my Entity Framework at anytime?
You can go for a mix of pregenerated ...