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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.function;
import org.ibatis.persist.criteria.Expression;

/**
 * Contract for expressions which model a SQL function call.
 *
 * @param  The type of the function result.
 */
public interface FunctionExpression extends Expression {
	/**
	 * Retrieve the name of the function.
	 *
	 * @return The function name.
	 */
	public String getFunctionName();

	/**
	 * Is this function a value aggregator (like a COUNT or MAX function e.g.)?
	 *
	 * @return True if this functions does aggregation.
	 */
	public boolean isAggregation();
}