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What's the difference between lists and tuples?
... and address in a customer record; in fact, doing so would generally be an error, which the tuple's immutability prevents you from committing.
– kindall
Oct 28 '13 at 18:58
4
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In C++, if throw is an expression, what is its type?
...ote that throw-expression are assignment-expression. So they are a syntax error as an argument to most operators. Obviously, you can hide them in parenthesis, but if they aren't ignored (first argument of builtin operator , for instance), it is a type error.
– AProgrammer
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How to use getJSON, sending data with post method?
...data contains the JSON object
//textStatus contains the status: success, error, etc
}, "json");
In that call, dataToBeSent could be anything you want, although if are sending the contents of a an html form, you can use the serialize method to create the data for the POST from your form.
var dat...
How to check if mysql database exists
...E = 'DBName'
If you just need to know if a db exists so you won't get an error when you try to create it, simply use (From here):
CREATE DATABASE IF NOT EXISTS DBName;
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Best Practice for Exception Handling in a Windows Forms Application?
... as simple as wrapping Main() in a try/catch, failing fast with a graceful error message to the user. This is the "last resort" exception handler.
Preemptive checks are always correct if feasible, but not always perfect. For example, between the code where you check for a file's existence and the n...
Why is iostream::eof inside a loop condition (i.e. `while (!stream.eof())`) considered wrong?
...llowing is how eof can be used (and even, be more reliable than fail() for error checking):
while( !(in>>std::ws).eof() ) {
int data;
in >> data;
if ( in.fail() ) /* handle with break or throw */;
// now use data
}
(Thanks Tony D for the suggestion to highlight the ...
可重入函数、不可重入函数及线程安全 - C/C++ - 清泛网 - 专注C/C++及内核技术
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fchown
lstat
setgid
symlink
aio_error
fcntl
mkdir
setpgid
sysconf
aio_return
fdatasync
mkfifo
setsid
tcdrain
aio_suspend
fork
open
setsockopt...
AngularJS ng-style with a conditional expression
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Syntax Error: Token '%3A' is%20an%20unexpected%20token at column 9 of the expression [ng-style%3A%...
– Bernardo Dal Corno
Sep 3 '18 at 2:11
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Permission denied (publickey) when SSH Access to Amazon EC2 instance [closed]
I want to use my Amazon ec2 instance but faced the following error:
29 Answers
29
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No Persistence provider for EntityManager named
...emoved it once I solved the problem, just to make sure). I was getting the error finally because persistence.xml was not in the src/META-INF folder, even though it had been in a folder in the Eclipse source path for the project. I'm thinking somewhere it's hard-wired to be on src/*
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