Login | Register   
RSS Feed
Download our iPhone app
Browse DevX
Sign up for e-mail newsletters from DevX

By submitting your information, you agree that devx.com may send you DevX offers via email, phone and text message, as well as email offers about other products and services that DevX believes may be of interest to you. DevX will process your information in accordance with the Quinstreet Privacy Policy.

Tip of the Day
Language: Java
Expertise: Intermediate
Apr 28, 2000



Building the Right Environment to Support AI, Machine Learning and Deep Learning

Create a Method Alias for a Sybase- or Oracle-Style Built-In Function with SQL-J

This example shows how to create a method, and then an alias for that method, to act like the Sybase-style SUBSTRING built-in function. (Note that you can also perform methods of java.lang.String on any string within SQL-J; simply select STRINGVALUE.substring(). This example just shows what to do in order to keep using your favorite syntax).

Make a class with a static method returning the requested substring to perform the function.
import java.sql.*;
public class MyBuiltIns
public static String substring(java.lang.String theString,
int start, int length)
if (theString.length() > start+length-1)
return theString.substring(start-1,start+length-1);
return theString.substring(start-1, theString.length());
Compile the file and make sure that the class is in the CLASSPATH environment variable. Add the method as an alias.
CREATE METHOD ALIAS substr FOR MyBuiltIns.substring 
Enter SQL like:
SELECT substr(name, 1, 5) FROM customers
This is the same as:
SELECT name.substring(0,4) FROM customers 
Manoj K.
Comment and Contribute






(Maximum characters: 1200). You have 1200 characters left.



Thanks for your registration, follow us on our social networks to keep up-to-date