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How to output something in PowerShell
I am running a PowerShell script from within a batch file. The script fetches a web page and checks whether the page's content is the string "OK".
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Purge Kafka Topic
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To purge the queue you can delete the topic:
bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic test
then re-create it:
bin/kafka-topics.sh --create --zookeeper localhost:2181 \
--replication-factor 1 --partitions 1 -...
What is a stored procedure?
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Stored procedures are a batch of SQL statements that can be executed in a couple of ways. Most major DBMs support stored procedures; however, not all do. You will need to verify with your particular DBMS help documentation for specifics. As I am mos...
How to analyze a java thread dump?
...'s waiting on:
"- waiting on <0x27ef0288> (a java.lang.ref.ReferenceQueue$Lock)"
Definition of the ReferenceQueue is:
Reference queues, to which registered reference objects are appended by the garbage collector after the appropriate reachability changes are detected.
The finalizer thread...
How do I generate random number for each row in a TSQL Select?
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When called multiple times in a single batch, rand() returns the same number.
I'd suggest using convert(varbinary,newid()) as the seed argument:
SELECT table_name, 1.0 + floor(14 * RAND(convert(varbinary, newid()))) magic_number
FROM information_schema.tables
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Evaluating a mathematical expression in a string
...UNCTION only allow functions in a 'safe' list.
from dis import opmap
from Queue import LifoQueue
from math import sin,cos
import operator
globs = {'sin':sin, 'cos':cos}
safe = globs.values()
stack = LifoQueue()
class BINARY(object):
def __init__(self, operator):
self.op=operator
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Integrating Dropzone.js into existing HTML form with other fields
...set the url where the form and files will be posted, deactivate autoProcessQueue (so it only happens when user presses 'submit') and allow multiple uploads (if you need it).
Set the init function to use Dropzone instead of the default behavior when the submit button is clicked.
Still in the init fun...
psql: FATAL: Peer authentication failed for user “dev”
...d a line to the pg_hba.conf that looks like:
local all some_batch_user md5
I would recommend that you add this line right below the commented header line:
# TYPE DATABASE USER ADDRESS METHOD
local all some_bat...
Difference between app.all('*') and app.use('/')
...hey can) they just process input data, and hand over it to next handler in queue.
app.use([path], function)
app.all takes multiple callbacks, and meant for routing. with multiple callbacks you can filter requests and send responses. Its explained in Filters on express.js
app.all(path, [callback....
Why are two different concepts both called “heap”?
...pers, but does say that the use of the term "heap" in relation to priority queues is the traditional sense of the word.
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