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The jBATIS persistence framework will help you to significantly reduce the amount of Java code that you normally need to access a relational database. iBATIS simply maps JavaBeans to SQL statements using a very simple XML descriptor.

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package org.ibatis.persist.impl.expression;

import org.ibatis.persist.criteria.Expression;

import org.ibatis.persist.impl.CriteriaBuilderImpl;
import org.ibatis.persist.impl.Renderable;
import org.ibatis.persist.impl.RenderingContext;

/**
 * Models unary arithmetic operation (unary plus and unary minus).
 */
public class UnaryArithmeticOperation 
		extends ExpressionImpl
		implements UnaryOperatorExpression {

	public static enum Operation {
		UNARY_PLUS, UNARY_MINUS
	}

	private final Operation operation;
	private final Expression operand;

	@SuppressWarnings({ "unchecked" })
	public UnaryArithmeticOperation(
			CriteriaBuilderImpl criteriaBuilder,
			Operation operation,
			Expression operand) {
		super( criteriaBuilder, (Class)operand.getJavaType() );
		this.operation = operation;
		this.operand = operand;
	}

	public Operation getOperation() {
		return operation;
	}

	@Override
	public Expression getOperand() {
		return operand;
	}

	@Override
    public void render(RenderingContext rc) {
        rc.append(getOperation() == Operation.UNARY_MINUS ? '-' : '+');
        ((Renderable) getOperand()).render(rc);
    }

	@Override
    public void renderProjection(RenderingContext rc) {
        render(rc);
        if (getAlias() != null) {
            rc.append(" AS ").append(getAlias());
        }
    }
}