The XQuery string-length function is used to get the length of a string.
string-length($string as xs:string) as xs:integer
Parameter explanation:
$string: It specifies the provided string.
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));
}
}
}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.
