Purpose : To demonstrate that Oracle database has an embedded JVM

Objective: PL/SQL is great, but it is an Oracle Proprietary language that cannot be ported to other database platforms,, Java is portable

Environment :  The example uses SQL*Plus, but other tools also work

Oracle Version: I Used Oracle9i, Oracle8i should work similarly

SQL> CREATE OR REPLACE and RESOLVE JAVA SOURCE NAMED "Hello" AS
public class Hello {
static public String Msg(String tail) {
return "Hello " + tail;
   }
}
/
Java created.


SQL> CREATE OR REPLACE FUNCTION hello( str VARCHAR2 )
RETURN VARCHAR2 AS
LANGUAGE JAVA NAME
'Hello.Msg (java.lang.String)
return java.lang.String';
/

SQL>SELECT hello (ENAME) from EMP;

HELLO(ENAME)
-----------------------------
Hello SMITH
Hello ALLEN
Hello WARD
Hello JONES
Hello MARTIN
Hello BLAKE
Hello CLARK
Hello SCOTT
Hello KING
Hello TURNER
Hello ADAMS

HELLO(ENAME)
-----------------------------
Hello JAMES
Hello FORD
Hello MILLER