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Foreign key constraints: When to use ON UPDATE and ON DELETE
... the foreign key constraints are quite advanced.
We'll take an example, a company table with a user table containing people from theses company
CREATE TABLE COMPANY (
company_id INT NOT NULL,
company_name VARCHAR(50),
PRIMARY KEY (company_id)
) ENGINE=INNODB;
CREATE TABLE USER (
...
How to clear MemoryCache?
...MemoryCache documentation makes me wonder if disposing and recreating is recommended: "Do not create MemoryCache instances unless it is required. If you create cache instances in client and Web applications, the MemoryCache instances should be created early in the application life cycle." Does this ...
what is the best way to convert a json formatted key value pair to ruby hash with symbol as key?
... you can pass in the symbolize_names option. See here: http://flori.github.com/json/doc/index.html (look under parse)
eg:
>> s ="{\"akey\":\"one\",\"bkey\":\"two\"}"
>> JSON.parse(s,:symbolize_names => true)
=> {:akey=>"one", :bkey=>"two"}
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wpf: how to show tooltip when button disabled by command?
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MSDN reference: msdn.microsoft.com/en-us/library/…
– David
Mar 8 '13 at 5:27
3
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How to detect Safari, Chrome, IE, Firefox and Opera browser?
...rowser-specific characteristics:
Internet Explorer: JScript's Conditional compilation (up until IE9) and document.documentMode.
Edge: In Trident and Edge browsers, Microsoft's implementation exposes the StyleMedia constructor. Excluding Trident leaves us with Edge.
Edge (based on chromium): The use...
Using C# reflection to call a constructor
...ructor. Whereas the runtime will do it for you if you call msdn.microsoft.com/en-us/library/wcxyzt4d.aspx
– Ben Voigt
Jul 15 '10 at 13:02
4
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Database Structure for Tree Data Structure
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You mention the most commonly implemented, which is Adjacency List:
https://blogs.msdn.microsoft.com/mvpawardprogram/2012/06/25/hierarchies-convert-adjacency-list-to-nested-sets
There are other models as well, including materialized path and nes...
Error in strings.xml file in Android
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post your complete string. Though, my guess is there is an apostrophe (') character in your string. replace it with (\') and it will fix the issue. for example,
//strings.xml
<string name="terms">
Hey Mr. Android, are you stuck?...
Should I delete the cgi-bin folder in a subdomain I just created?
...l on my hosting account, I created a subdomain - e.g. www.clothing.mysite.com
4 Answers
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Reading JSON from a file?
...In that case, there is some invalid json in that file. For that, I would recommend running the file through a json validator.
There are also solutions for fixing json like for example How do I automatically fix an invalid JSON string?.
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