kettle 循环执行作业

1.JavaScript 

var prevRow=previous_result.getRows();//获取上一个传递的结果,数据库中查询的结果集
if (prevRow == null &&(prevRow.size()=0))
{
false;

}else{
parent_job.setVariable("tables", prevRow);//ArrayList存储表名变量，以数组形式保存入table1，table2
parent_job.setVariable("size", prevRow.size());//存储执行表的总数量
parent_job.setVariable("i",new Number(0));//循环控制变量
parent_job.setVariable("k",0);

parent_job.setVariable("id", prevRow.get(0).getString("hosp","hosp"));//根据字段名获取值
parent_job.setVariable("hospname", prevRow.get(0).getString("hospname","hospname"));
true;
}

2.JavaScript2
var prevRow=previous_result.getRows();
var size = new Number(parent_job.getVariable("size"));
var i = new Number(parent_job.getVariable("i"))+1;

if(i<size){
parent_job.setVariable("id",prevRow.get(i).getString("hosp","hosp"));
parent_job.setVariable("hospname",prevRow.get(i).getString("hospname","hospname"));
}
parent_job.setVariable("i",i);

true;3.循环停止条件，


4.数据库结果集查询