instr.java

来自「mysql集群」· Java 代码 · 共 27 行

package com.meidusa.amoeba.parser.function;

import java.util.List;

import com.meidusa.amoeba.parser.expression.Expression;
import com.meidusa.amoeba.sqljep.ParseException;

public class Instr extends AbstractFunction {

	public Comparable evaluate(List<Expression> list, Object[] parameters)
			throws ParseException {
		if(list.size() != 2){
			return null;
		}
		
		String param1 = (String)list.get(0).evaluate(parameters);
		String param2 = (String)list.get(1).evaluate(parameters);
		
		if(param1 == null || param2 == null){
			return 0;
		}
		
		return param1.indexOf(param2) +1;
	}

}