大约有 31,840 项符合查询结果（耗时：0.0297秒） [XML]
Should programmers use SSIS, and if so, why? [closed]
...loper for 10.
The value of SSIS is as a workflow engine to move data from one spot to another with maybe some limited transformation and conditional branching along the way. If your packages contain a lot of script then your team is using SSIS for the wrong tasks or isn't comfortable with SQL or ha...
How can I prevent SQL injection in PHP?
... Also, the official documentation of mysql_query only allows to execute one query, so any other query besides ; is ignored. Even if this is already deprecated there are a lot of systems under PHP 5.5.0 and that may use this function. php.net/manual/en/function.mysql-query.php
...
The simplest possible JavaScript countdown timer? [closed]
...
I have two demos, one with jQuery and one without. Neither use date functions and are about as simple as it gets.
Demo with vanilla JavaScript
function startTimer(duration, display) {
var timer = duration, minutes, seconds;
set...
COUNT(*) vs. COUNT(1) vs. COUNT(pk): which is better? [duplicate]
...bleHere.*), use that.
In short, don't use COUNT(1) for anything. It's a one-trick pony, which rarely does what you want, and in those rare cases is equivalent to count(*)
Use count(*) for counting
Use * for all your queries that need to count everything, even for joins, use *
SELECT boss.boss_...
How to rollback a specific migration?
...1
Is a way to do this, if the migration you want to rollback is the last one applied. You can substitute 1 for however many migrations you want to go back.
For example:
rake db:rollback STEP=5
Will also rollback all the migration that happened later (4, 3, 2 and also 1).
To roll back all migr...
Can an input field have two labels?
...ach information to controls. Each LABEL element is associated with exactly one form control.
Thus, each form control can be referenced by multiple labels, but each label can only reference one control. So if it makes sense to have a second label for a control (and in the situation you describe, it...
Which UUID version to use?
...network card MAC address and a timer. These IDs are easy to predict (given one, I might be able to guess another one) and can be traced back to your network card. It's not recommended to create these.
Version 4: These are generated from random (or pseudo-random) numbers. If you just need to generate...
Hash String via SHA-256 in Java
...out more information it would be hard to say why you are getting different ones. You should probably open a new question.
– Brendan Long
Aug 9 '10 at 21:16
...
Removing first x characters from string?
How might one remove the first x characters from a string? For example, if one had a string lipsum , how would they remove the first 3 characters and get a result of sum ?
...
“Default Activity Not Found” on Android Studio upgrade
...ity, to be launched when the application starts.
You should have at least one activity that looks something like this:
<activity
android:name="com.your.package.name.YourActivity"
android:label="@string/app_name">
<intent-filter>
<action android:na...