Mathematica5 -> Q interface
----------------------------
(Felix LUNGU, First Derivatives PLC)

1. download (http://kx.com/q/c/c.java),compile and jar the c.java
in $QHOME (c:\q or $HOME/q) as c.jar:

Unix:
cd $HOME/q
mkdir tmp
javac -d tmp c.java
jar cvf c.jar -C tmp .
rm -fr tmp

Windows:
cd c:\q
mkdir tmp
javac -d tmp c.java
jar cvf c.jar -C tmp .
rmdir -fr tmp

2. Start Mathematica Kernel console

3. Load the JLink module:

Needs["JLink`"]

4. Start Java: 

InstallJava[CommandLine -> "javaw", ClassPath -> "c:\\q\\c.jar"]

5. Create c object:

c = JavaNew["c", "localhost", 5001]

6. Call the "k" method to execute queries:

c@k["tables`."]
r = c@k["select from trade"]

7. Inspect the a flip from query:
r@x
r@y

Note: some classes (Date,...) don't have a direct mappings
in Mathematica.
You may want to write a wrapper to addapt them to Mathematica or
call the "toString" method on them.