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Is there a MySQL option/feature to track history of changes to records?
..._from and valid_until dates, you can reconstruct the entire picture historically. To find the current status, you search for records with a null VALID_UNTIL date.
It's unwieldy (strictly speaking, you don't need the valid_from, but it makes the queries a little easier). It complicates your design ...
Is it possible to dynamically compile and execute C# code fragments?
...agments to a text file (or any input stream), and then execute those dynamically? Assuming what is provided to me would compile fine within any Main() block, is it possible to compile and/or execute this code? I would prefer to compile it for performance reasons.
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File Upload without Form
...rl: your_ajax_path,
dataType : 'json',
// in PHP you can call and process file in the same way as if it was submitted from a form:
// $_FILES['input_file_name']
success: function(jsonData){
...
}
...
});
});
Don't forget to add pro...
How to list all users in a Linux group?
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@JohnMcGehee RHEL should have been called AustereLinux
– goelakash
Sep 7 '16 at 8:31
1
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How to calculate a time difference in C++
...eful: This won't work if the user changes his time between Timer() and the call to elapsed() if !std::chrono::high_resolution_clock::is_steady - which is the case on Linux!
– jhasse
Feb 9 '18 at 12:33
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Can I run HTML files directly from GitHub, instead of just viewing their source?
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There is a new tool called GitHub HTML Preview, which does exactly what you want. Just prepend http://htmlpreview.github.com/? to the URL of any HTML file, e.g. http://htmlpreview.github.com/?https://github.com/twbs/bootstrap/blob/gh-pages/2.3.2...
ActionBar text color
...el < 11, ActionBarSherlock and you'd like to save yourself an expensive call to getIndentifier(), you can look in (TextView) findViewById(com.actionbarsherlock.R.id.abs__action_bar_title); first (be sure to check if it's not null).
– Andre
Apr 22 '13 at 8:36...
Can I scroll a ScrollView programmatically in Android?
Is there any way to scroll a ScrollView programmatically to a certain position?
18 Answers
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The relationship could not be changed because one or more of the foreign-key properties is non-nulla
...any parent in the database (due to the foreign key constraint). That's basically what the exception says.
Edit
What I would do if child items could be added, updated and deleted:
public void UpdateEntity(ParentItem parent)
{
// Load original parent including the child item collection
var...
$.ajax - dataType
...t is default, i mean im going manual, and rebuilding the object after each call, but in resetting, im having problems. if i set it to 'json' as default, in no way will that complement the intelligent guess, but it works to a certain extent, until it gets to the call where i havent specified(that is...