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how to emulate “insert ignore” and “on duplicate key update” (sql merge) with postgresql?
...start transaction; create temporary table temporary_table as select * from test where false; copy temporary_table from 'data_file.csv'; lock table test; update test set data=temporary_table.data from temporary_table where test.id=temporary_table.id; insert into test select * from temporary_table whe...
is_null($x) vs $x === null in PHP [duplicate]
...there is a time difference between using === and is_null(). Did some quick testing and got these results:
<?php
//checking with ===
$a = array();
$time = microtime(true);
for($i=0;$i<10000;$i++) {
if($a[$i] === null) {
//do nothing
}
}
echo 'Testing with === ', microtime(tru...
The most accurate way to check JS object's type?
...
That test on jsPerf isn't quite accurate. Those tests are not equal (testing for the same thing). E.g., typeof [] returns "object", typeof {} also returns "object", even though one is an object Array and the other is an object Ob...
Adding an identity to an existing column
...ess than 5 seconds.
Here's a code sample of how it works.
CREATE TABLE Test
(
id int identity(1,1),
somecolumn varchar(10)
);
INSERT INTO Test VALUES ('Hello');
INSERT INTO Test VALUES ('World');
-- copy the table. use same schema, but no identity
CREATE TABLE Test2
(
id int NO...
How to configure Ruby on Rails with no database?
... yes, this works with Rails 4 :) - just validated. If you want to ditch test unit use: rails new myApp-O --skip-bundle -T
– Chris Hough
Oct 8 '13 at 7:01
1
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Load dimension value from res/values/dimension.xml from source code
...
In my dimens.xml I have
<dimen name="test">48dp</dimen>
In code If I do
int valueInPixels = (int) getResources().getDimension(R.dimen.test)
this will return 72 which as docs state is multiplied by density of current phone (48dp x 1.5 in my case)
...
“#include” a text file in a C program as a char[]
...o the new raw string literals:
In C++ do this:
const char *s =
#include "test.txt"
;
In the text file do this:
R"(Line 1
Line 2
Line 3
Line 4
Line 5
Line 6)"
So there must only be a prefix at the top of the file and a suffix at the end of it. Between it you can do what you want, no special es...
Test for multiple cases in a switch, like an OR (||)
How would you use a switch case when you need to test for a or b in the same case?
6 Answers
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Differences between Line and Branch coverage
...erage in the first case, so you can see there is something missing in your testing (and often, in your code).
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Using curl to upload POST data with files
... -F "filecomment=This is an image file" \
-F "image=@/home/user1/Desktop/test.jpg" \
localhost/uploader.php
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