Help:About the MDX query used in JAVA

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OLAP Server:Cognos SERVER 8.3
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As we know,we can run a SQL Query to get a dataset from RDB by quoting a class named "java.sql.*",when compile the JAVA Code.
In a similar way,We can also run a MDX Query to get a dataset from The MOLAP OR ROLAP in Cognos.But,what's the class name??S/A?Installed the Cognos SDK?

Thanks a lot!