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Error 1022 - Can't write; duplicate key in table
...ere the constraints are currently in use you can use the following query:
SELECT `TABLE_SCHEMA`, `TABLE_NAME`
FROM `information_schema`.`KEY_COLUMN_USAGE`
WHERE `CONSTRAINT_NAME` IN ('iduser', 'idcategory');
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How to disable copy/paste from/to EditText
...y,paste,cut and custom context menus from appearing by.
edittext.setCustomSelectionActionModeCallback(new ActionMode.Callback() {
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return false;
}
public void onDestroyActionMode(Ac...
How to create a database from shell command?
... I get this error ERROR 1046 (3D000) at line 27: No database selected when I run echo "create database databasename" | mysql -u -u username -p command
– keerthi
Mar 15 '13 at 5:16
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Do I need Content-Type: application/octet-stream for file download?
...inline some would always use it, while others would use it if the user had selected "save link as" but not if they'd selected "save" while viewing (or at least IE used to be like that, it may have changed some years ago).
sh...
关于php的socket初探 - PHP - 清泛IT论坛，有思想、有深度
...连接的模型都应该被称为多路复用，目前比较常用的有 select/poll/epoll/kqueue 这些 IO 模型（目前也有像 Apache 这种每个连接用单独的进程/线程来处理的 IO 模型，但是效率相对比较差，也很容易出问题，所以暂时不做介绍了）。在...
How to delete projects in IntelliJ 12?
...n a file menu appears, you can right click the unwanted project folder and select Delete.
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Using Caps Lock as Esc in Mac OS X
...d fixing bugs.
Here's a screenshot to show a few of the (hundreds of) pre-selectable options:
PQRS also has a great utility called NoEjectDelay that you can use in combination with KeyRemap4MacBook for reprogramming the Eject key. After a little tweaking I have mine set to toggle the AirPort Wif...
Visual Studio: ContextSwitchDeadlock
... aspect of the UI. Tools\Customize, then Rearrange Commands (button), then Select Debug from drop-down at upper right, then Add (button). Whew!
– SeaDrive
Feb 23 '09 at 17:56
84
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Using current time in UTC as default value in PostgreSQL
...rap it in a function:
create function now_utc() returns timestamp as $$
select now() at time zone 'utc';
$$ language sql;
create temporary table test(
id int,
ts timestamp without time zone default now_utc()
);
shar...
How to make rounded percentages add up to 100%
...original,
decimal forceSum, int decimals)
{
var rounded = original.Select(x => Math.Round(x, decimals)).ToList();
Debug.Assert(Math.Round(forceSum, decimals) == forceSum);
var delta = forceSum - rounded.Sum();
if (delta == 0) return rounded;
var deltaUnit = Convert.ToDecim...