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Assign null to a SqlParameter
... for the ?: operator that explains the problem
Either the type of first_expression and second_expression must be the same, or an implicit conversion must exist from one type to the other.
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Hide separator line on one UITableViewCell
...er}) {
cell.separatorInset = UIEdgeInsetsMake(0.0f, 0.0f, 0.0f, CGFLOAT_MAX);
}
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mysql error 1364 Field doesn't have a default values
...
Set a default value for Created_By (eg: empty VARCHAR) and the trigger will update the value anyways.
create table try (
name varchar(8),
CREATED_BY varchar(40) DEFAULT '' not null
);
...
What is DOM Event delegation?
... to "rebind" the "onclick" event handler to the new <li> element, in order for it to act the same way as its siblings. With event delegation you don't need to do anything. Just add the new <li> to the list and you're done.
This is absolutely fantastic for web apps with event handlers bo...
How do I assign an alias to a function name in C++?
...-template non-overloaded functions you can simply use:
const auto& new_fn_name = old_fn_name;
If this function has multiple overloads you should use static_cast:
const auto& new_fn_name = static_cast<OVERLOADED_FN_TYPE>(old_fn_name);
Example: there are two overloads of function st...
How to get an MD5 checksum in PowerShell
...d($file)
$buf = New-Object byte[] (1024*1024*8) # 8 MB buffer
while (($read_len = $fd.Read($buf,0,$buf.length)) -eq $buf.length){
$total += $buf.length
$md5.TransformBlock($buf,$offset,$buf.length,$buf,$offset)
Write-Progress -Activity "Hashing File" `
-Status $file -percentComple...
Git vs Team Foundation Server [closed]
... discourage the moment-to-moment kind of work the developers have to do in order to make really good branch-and-merge work. Distributed systems encourage what I call "apposite" commits (self-contained, small commits of relevant work with good descriptions) and centralized systems encourage what I c...
psql: FATAL: role “postgres” does not exist
... which will just use the latest version.
start postgres server manually: pg_ctl -D /usr/local/var/postgres start
To start server at startup
mkdir -p ~/Library/LaunchAgents
ln -sfv /usr/local/opt/postgresql/*.plist ~/Library/LaunchAgents
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.post...
What is the meaning of the term arena in relation to memory?
...ost importantly, it requires platform-specific knowledge to get the memory ordering right. I use "magic" for things that can either not be written portably by the user at all (like an efficient mutex, or tcmalloc, or the type name of a lambda), or only with extreme heroics (like std::function); I do...
How to read a line from the console in C?
...r * getline(void) {
char * line = malloc(100), * linep = line;
size_t lenmax = 100, len = lenmax;
int c;
if(line == NULL)
return NULL;
for(;;) {
c = fgetc(stdin);
if(c == EOF)
break;
if(--len == 0) {
len = lenmax;
...