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Why is SELECT * considered harmful?
...code saves more time and effort in the long run.
If code depends on column order, SELECT * will hide an error waiting to happen if a table had its column order changed.
Even if you need every column at the time the query is written, that might not be the case in the future
the usage complicates pro...
Is it alright to use target=“_blank” in HTML5?
...call reading somewhere that in HTML5 it was no longer okay to use target="_blank" in HTML5, but I can't find it now.
9 An...
Creating JS object with Object.create(null)?
...ototype).
In Chrome Devtool you can see that Object.create(null) has no __proto__ property, while {} does.
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How to find Unused Amazon EC2 Security groups
... Display Security Groups left to audit / delete
echo "select * from groups order by groupid" | mysql $DBCONFIG $DB | sed 's/groupid\t/groupid\t\t/'
And here is the sql to create the database.
-- MySQL dump 10.13 Distrib 5.5.41, for debian-linux-gnu (x86_64)
--
-- Host: localhost Database: aws...
List goals/targets in GNU make that contain variables in their definition
...ion would be to create a trivial makefile, dummy.mk, with these contents:
__all_targets__: ; #no-op
Now invoke make as make -p -f Makefile -f dummy.mk __all_targets__. On any substantial build, the difference in the amount of output generated by make is significant. For example:
$ gmake -pn | ...
Locking a file in Python
...file locking (Linux, Ubuntu, MacOS, etc.)
import fcntl, os
def lock_file(f):
fcntl.lockf(f, fcntl.LOCK_EX)
def unlock_file(f):
fcntl.lockf(f, fcntl.LOCK_UN)
except ModuleNotFoundError:
# Windows file locking
import msvcrt, os
def file_size(f):
return o...
How to enable C++11/C++0x support in Eclipse CDT?
...t; Paths and Symbols -> Symbols -> GNU C++. Click "Add..." and paste __GXX_EXPERIMENTAL_CXX0X__ (ensure to append and prepend two underscores) into "Name" and leave "Value" blank.
Hit Apply, do whatever it asks you to do, then hit OK.
There is a description of this in the Eclipse FAQ now as ...
Timeout on a function call
....:
# This function *may* run for an indetermined time...
In [3]: def loop_forever():
...: import time
...: while 1:
...: print("sec")
...: time.sleep(1)
...:
...:
# Register the signal function handler
In [4]: signal.signal(signal.SIGALR...
How to drop column with constraint?
...'alter table tbloffers drop constraint ['+dc.NAME+N']'
from sys.default_constraints dc
JOIN sys.columns c
ON c.default_object_id = dc.object_id
WHERE
dc.parent_object_id = OBJECT_ID('tbloffers')
AND c.name = N'checkin'
IF @@ROWCOUNT = 0 BREAK
EXEC (@sql)
END
...
undefined reference to `__android_log_print'
...
Try the following in your Android.mk file:
LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -llog
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