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Constructors
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Information contained in an XML document is stored as a series of characters called a string This isn t a problem unless you want to use the information in a calculation; then you need to convert the character to a type of information that can be calculated There are several types of data, which are referred to as data types You re familiar with most of them These are numbers, decimals, dates, and Boolean Boolean is true or false And, of course, there is a string Let s say that you want to calculate the sales tax for a CD The price of the CD is $1995 and is in the XML document However, $1995 is a string and not a
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CHAPTER 9 XQuery
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number Therefore, you must convert $1995 from a string to a decimal A decimal contains both a whole number and a decimal number You can convert information contained in an XML document to another data type by using a constructor A constructor tries to convert the content of an XML tag to a data type If it fails, then it returns an error Table 9-1 contains a list of constructors You use them within the XQuery to convert information from the XML document into a different data type so it can be used in a calculation A constructor requires you to pass it the name of the tag The constructor then returns the converted value Typically you ll assign the converted value to a variable and then use the variable in a calculation Here s how to convert the CD price to a decimal value The xs:decimal() is the constructor The doc() function retrieves the catalogxml document that contains the price /catalog/cd/price are parent/child tags that identify the tag whose text is being converted to a decimal The converted value is assigned to the $price variable:
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let $price := xs:decimal(doc( catalogxml")/catalog/cd /price)
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Constructors are frequently used in the conditional statements in a where clause to compare the search criteria to the value of the XML tag Let s say that you want to extract the title and price of all the CDs that are less than $1100 with a release date greater than 1993-10-31 In order to do this, you need to convert the text of the price tag to a decimal and the text of the date tag to a date data type Once they re converted, you can write a conditional statement that compares these values against the search criteria
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Constructor xs:decimal xs:date
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Description Constructs a decimal value from a string The string must be a number Constructs a date value from a string The string must conform to the pattern YYYY-MM-DD; for example, 2006-10-31 Constructs a double precision oating point number from a string Constructs a oating point number from a string Constructs a hex binary value from a string Constructs an integer from a string Constructs a time
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xs:double xs: oat xs:hexBinary xs:int xs:time
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Table 9-1
Constructors Used to Convert XML Strings
XML Demysti ed
Let s walk through the next example and see how this works The for clause opens the catalog XML document and assigns the /catalog/cd tags to the $cd variable You then combine the $cd variable with the /price tag and the /date tag in the constructors You do this to make the code easier to read You could have passed the complete parent/child tags to the constructor such as we did in the example we show earlier in this section You use the xs:decimal() constructor and the xs:date() constructor to convert the price and the date to its respective data type and assign the converted value to variables You then use variables in the conditional expression of the where clause The value of the $price variable is compared to 1100 and the value of the $date variable is compared to 1993-10-31 Notice that 1993-10-31 must also be converted to a date because 199310-31 is a string just like the date in the XML document You use the less than operator (<) to determine if the value of the price variable is less than 1100; and use the greater than operator (>) to determine if the value of the date variable is greater than 1993-1031 Both conditions must be true for the conditional statement to be true, and for information about the CD to be returned by the XQuery
<html> <body> List of titles in this catalog:<br/> <ul> { for $cd in doc("catalogxml")/catalog/cd let $price := xs:decimal($cd/price) let $date := xs:date($cd/date) where $price < 1100 and $date > xs:date("1993-10-31") order by $date return <li>{data($cd/title)} - ${$price} - {$date}</li> } </ul> </body> </html>
Here s the result of this XQuery:
<html> <body> List of titles in this catalog:<br><ul> <li>Houses of the Holy - $1098 - 1994-07-19</li> <li>Songs in the Attic - $1099 - 1998-10-20</li> </ul> </body> </html>
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