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Check if database exists in PostgreSQL using shell
...ue if you use this expression in a logical statement. you can try these examples to test: psql -l | grep doesnt_matter_what_you_grep | wc -l && echo "true" vs psql -l | grep it_does_matter_here && echo "only true if grep returns anything"
– Mike Lyons
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How do I save and restore multiple variables in python?
I need to save about a dozen objects to a file and then restore them later.
I've tried to use a for loop with pickle and shelve but it didn't work right.
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Get the latest record from mongodb collection
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php7.1 mongoDB:
$data = $collection->findOne([],['sort' => ['_id' => -1],'projection' => ['_id' => 1]]);
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Storing Data in MySQL as JSON
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Yeah, im looking at Mongo, and php has an extension for it and the actual syntax for the DB transactions seems easier than MySQL and the overall working with it seems easier that couchDB. Thanks, I think im going to go with MongoDB :)
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How to debug heap corruption errors?
...ed memory
#undef free
#define free(p) _free_dbg(p, _NORMAL_BLOCK); *(int*)&p = 0x666;
#endif
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Constructors in Go
...nsed construct :
func NewThing(someParameter string) *Thing {
return &Thing{someParameter, 33}
}
If you don't want to return a pointer, then a practice is to call the function makeThing instead of NewThing :
func makeThing(name string) Thing {
return Thing{name, 33}
}
Reference : A...
MySQL DROP all tables, ignoring foreign keys
Is there a nice easy way to drop all tables from a MySQL database, ignoring any foreign key constraints that may be in there?
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How to round up to the nearest 10 (or 100 or X)?
...,5,10), seq(1, 10, 0.1)
If you have a range of values in your plot, for example [3996.225, 40001.893] then the automatic way should take into account both the size of the range and the magnitude of the numbers. And as noted by Hadley, the pretty() function might be what you want.
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Why is NaN not equal to NaN? [duplicate]
...lculations when probing the value of a mathematical function; one of the examples given in the linked document is finding the zeros() of a function f(). It is entirely possible that in the process of probing the function with guess values that you will probe one where the function f() yields no sens...
Batch Renaming of Files in a Directory
...name(r'c:\temp\xx', r'*.doc', r'new(%s)')
The above example will convert all *.doc files in c:\temp\xx dir to new(%s).doc, where %s is the previous base name of the file (without extension).
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