XQuery String Lngth() Function

by Online Tutorials Library July 14, 2022

XQuery string-length() Function

The XQuery string-length function is used to get the length of a string.

Parameter explanation:

$string: It specifies the provided string.

XQuery string-length Example

Let’s take an example to demonstrate the usage of XQuery string-length function. Take an XQuery expression named “books.xqy”, having the following code.

XQuery Expression:

books.xqy:

  let $bookTitle := “Java Programming”  let $size := string-length($bookTitle)  return     <result>           <size>{$size}</size>     </result>  

Create a Java based XQuery executor program to read the books.xqy, passes it to the XQuery expression processor, and executes the expression. After that the result will be displayed.

XQueryTester.java

  import java.io.File;  import java.io.FileInputStream;  import java.io.FileNotFoundException;  import java.io.InputStream;    import javax.xml.xquery.XQConnection;  import javax.xml.xquery.XQDataSource;  import javax.xml.xquery.XQException;  import javax.xml.xquery.XQPreparedExpression;  import javax.xml.xquery.XQResultSequence;    import com.saxonica.xqj.SaxonXQDataSource;    public class XQueryTester {     public static void main(String[] args){        try {           execute();        }                catch (FileNotFoundException e) {           e.printStackTrace();        }                catch (XQException e) {           e.printStackTrace();        }     }       private static void execute() throws FileNotFoundException, XQException{        InputStream inputStream = new FileInputStream(new File(“books.xqy”));        XQDataSource ds = new SaxonXQDataSource();        XQConnection conn = ds.getConnection();        XQPreparedExpression exp = conn.prepareExpression(inputStream);        XQResultSequence result = exp.executeQuery();         while (result.next()) {           System.out.println(result.getItemAsString(null));        }     }  }  

Execute XQuery against XML

Put the above both files to a same location. We put them on desktop in a folder name XQuery13. Compile XQueryTester.java using console. You must have JDK 1.5 or later installed on your computer and classpaths are configured.

Compile:

javac XQueryTester.java

Execute:

java XQueryTester

Output:

The above example specifies that the given string-length is 16. Space is treated as length character.

download this example

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