Query Cache SELECT Options

SELECT SQL_CACHE id, name FROM customer;
SELECT SQL_NO_CACHE id, name FROM customer;

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Enable the query cache in MySQL to Improve Performance

To see the cache size: 

mysql> SHOW VARIABLES LIKE 'query_cache_size';  

To manage the cache size:

mysql> SET GLOBAL query_cache_size = 16777216;

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MS SQL SERVER - String Comparison

Sometimes, comparing 2 strings can be a bit tricky in MS SQL Server. For example, if there is a field of name as varchar(n), containing the value of "Microsoft", it is actually treated as "Microsoft        " (fill the rest of field with spaces). Therefore using = always return wrong answer. Using LIKE however, return those strings which contains word Microsoft which is not the desired answer. The solution is to use PATTERN MATCHING as follow:

SELECT "Microsoft        " = "Microsoft[ ]%"

[ ]% represents the spaces

Update the MySQL Query in Safe Mode

SET SQL_SAFE_UPDATES = 0;

APPML: Application Markup Language

What is <AppML>?

<AppML> is an application development framework, consisting of: 

• An XML language for defining application models
• A JavaScript running the the browser
• A PHP or ASP script running on the server

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Generate Random Numbers in C#

private static int seed = Environment.TickCount;

// Generate random number tick
private static ThreadLocal<Random> randomWrapper =
            new ThreadLocal<Random>(() => new Random(Interlocked.Increment(ref seed)));
           
randomWrapper.Value.Next(additionMinValue, additionMaxValue);

Reading repetitive XML to memory using C#

Sample XML Document:
<Elements>
    <Element>
        <Name>N1</Name>
        <Type>T1</Type>
        <Color>C1</Color>
    </Element>
    <Element>
        <Name>N2</Name>
        <Type>T2</Type>
        <Color>C2</Color>
    </Element>
    <Element>
        <Name>N3</Name>
        <Type>T3</Type>
        <Color>C3</Color>
    </Element>
</Elements>


Sample C# Code:
XmlDocument myDoc = new XmlDocument()
myDoc.Load(XML_File_Path_Name);

foreach(XmlElement elem in myDoc.SelectNodes("Elements/Element"))
{
    XmlNode nodeName = elem.SelectSingleNode("Name/text()");
    XmlNode nodeType = elem.SelectSingleNode("Type/text()");
    XmlNode nodeColor = elem.SelectSingleNode("Color/text()");

    string name = nodeName!=null ? nodeName.Value : String.Empty;
    string type = nodeType!=null ? nodeType.Value : String.Empty;
    string color = nodeColor!=null ? nodeColor.Value : String.Empty;
}