Compiling the Java Code

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Compiling the Java Code

A UDR written in Java code is implemented by a static method in a Java class.

To make the Java source code into an executable format

Compile the java files with the javac command to create class files.

Use the jar command to collect a set of class files into a JAR file.

For example:

# makefile for admin class
JAR_NAME = admin.jar
all:
    javac *.java
    jar cvmf manifest.txt $(JAR_NAME) 
         deploy.txt *.class
    mv $(JAR_NAME) $(INFORMIXDIR)/jars
cleanup:
    rm -f *.class $(INFORMIXDIR)/jars/$(JAR_NAME)

JAR files contain Java classes that in turn contain static methods corresponding to SQL UDRs. JAR files can also contain auxiliary classes and methods that are used by the UDRs (for example, to perform SQL-to-Java type mapping).