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Database Design for Revisions?
...ey field of the table being updated. If it's a combined key, we just do a string concatenation with a '~' between the fields.
I'm sure this system may have drawbacks - for heavily updated databases the performance may be hit, but for my web-app, we get many more reads than writes and it seems to b...
Using C++ library in C code
... with extern "C":
extern "C" int foo(char *bar)
{
return realFoo(std::string(bar));
}
Then, you will call foo() from your C module, which will pass the call on to the realFoo() function which is implemented in C++.
If you need to expose a full C++ class with data members and methods, then yo...
Annotating text on individual facet in ggplot2
...ag_pool[lay$PANEL], close), x = x, y = y)
p + geom_text(data = tags, aes_string(x = "x", y = "y", label = "label"), ..., hjust = hjust,
vjust = vjust, fontface = fontface, family = family, inherit.aes = FALSE)
}
Align top right & use Roman numerals
tag_facet(p, x = Inf,...
How do I escape reserved words used as column names? MySQL/Create Table
...portability between different SQL servers you should use ANSI SQL queries. String escaping in ANSI SQL is done by using double quotes ("). Unfortunately, this escaping method is not portable to MySQL, unless it is set in ANSI compatibility mode.
Personally, I always start my MySQL server with the -...
@Basic(optional = false) vs @Column(nullable = false) in JPA
...and it turns out the annotation is ignored in actual usage (at least for a String field). (e.g. entityManager.persist calls).
So I went to the specification and read up about it.
Here is what the spec has to say:
http://download.oracle.com/otndocs/jcp/persistence-2.0-fr-oth-JSpec/
Basic(optiona...
Nohup is not writing log to output file
...ut &
Also, you can use PYTHONUNBUFFERED. If you set it to a non-empty string it will work same as the -u option. For using this run below commands before running python code.
export PYTHONUNBUFFERED=1
or
export PYTHONUNBUFFERED=TRUE
P.S.- I will suggest using tools like cron-job to run ...
jQuery find element by data attribute value
...
I searched for a the same solution with a variable instead of the String.I hope i can help someone with my solution :)
var numb = "3";
$(`#myid[data-tab-id=${numb}]`);
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How to break out of a loop from inside a switch?
...oop that checks the condition in the middle. Classic example: while(true) {string line; std::getline(is,line); if(!is) break; lines.push_back(line);} Of course I could transform this to a preconditioned loop (using std::getline as the loop condition), but this has disadvantages on its own (line woul...
open-ended function arguments with TypeScript
...er must be last parameter in the parameter list.likewise function sum(name:string,age:number,...numbers: number[]).
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How to version REST URIs
...
The client receives a URI it wants to follow, and treats it as an opaque string. Put whatever you want in it, the client has no knowledge of such a thing as a version identifier on it.
What the client knows is that it can process the media type, and I'll advise to follow Darrel's advice. Also I p...