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package PWC254;
/**
* PL/Java implementation for PWC 254
* Task 1
* See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-254>
*
*
* To compile on the local machine:
$ export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64/ # if not already set
$ mvn clean build
$ $ scp target/PWC253-1.jar luca@venkman:/tmp
* To install into PostgreSQL execute:
select sqlj.install_jar( 'file:///tmp/PWC254-1.jar', 'PWC254', true );
select sqlj.set_classpath( 'public', 'PWC254' );
select task1_pljava();
and then to redeploy:
select sqlj.replace_jar( 'file:///tmp/PWC254-1.jar', 'PWC254', true );
*/
import org.postgresql.pljava.*;
import org.postgresql.pljava.annotation.Function;
import static org.postgresql.pljava.annotation.Function.Effects.IMMUTABLE;
import static org.postgresql.pljava.annotation.Function.OnNullInput.RETURNS_NULL;
import java.util.*;
import java.sql.SQLException;
import java.util.logging.*;
public class Task1 {
private final static Logger logger = Logger.getAnonymousLogger();
@Function( onNullInput = RETURNS_NULL, effects = IMMUTABLE )
public static final boolean task1_pljava( int num ) throws SQLException {
for ( int i = 2; i < Math.sqrt( num ); i++ )
if ( Math.pow( i, 3 ) == num )
return true;
return false;
}
}
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