Background: I'm using Talend to do something (I guess) that is pretty common: generating multiple rows from one. For example:
ID | Name | DateFrom | DateTo
01 | Marco| 01/01/2014 | 04/01/2014
...could be split into:
new_ID | ID | Name | DateFrom | DateTo
01 | 01 | Marco | 01/01/2014 | 02/01/2014
02 | 01 | Marco | 02/01/2014 | 03/01/2014
03 | 01 | Marco | 03/01/2014 | 04/01/2014
The number of outcoming rows is dynamic, depending on the date period in the original row.
Question: how can I do this? Maybe using tSplitRow? I am going to check those periods with tJavaRow. Any suggestions?
Expanding on the answer given by Balazs Gunics
Your first part is to calculate the number of rows one row will become, easy enough with a date diff function on the to and from dates
Part 2 is to pass that value to a tFlowToIterate, and pick it up with a tJavaFlex that will use it in its start code to control a for loop:
tJavaFlex start:
int currentId = (Integer)globalMap.get("out1.id");
String currentName = (String)globalMap.get("out1.name");
Long iterations = (Long)globalMap.get("out1.iterations");
Date dateFrom = (java.util.Date)globalMap.get("out1.dateFrom");
for(int i=0; i<((Long)globalMap.get("out1.iterations")); i++) {
Main
row2.id = currentId;
row2.name = currentName;
row2.dateFrom = TalendDate.addDate(dateFrom, i, "dd");
row2.dateTo = TalendDate.addDate(dateFrom, i+1, "dd");
End
}
and sample output:
1|Marco|01-01-2014|02-01-2014
1|Marco|02-01-2014|03-01-2014
1|Marco|03-01-2014|04-01-2014
2|Polo|01-01-2014|02-01-2014
2|Polo|02-01-2014|03-01-2014
2|Polo|03-01-2014|04-01-2014
2|Polo|04-01-2014|05-01-2014
2|Polo|05-01-2014|06-01-2014
2|Polo|06-01-2014|07-01-2014
2|Polo|07-01-2014|08-01-2014
2|Polo|08-01-2014|09-01-2014
2|Polo|09-01-2014|10-01-2014
2|Polo|10-01-2014|11-01-2014
2|Polo|11-01-2014|12-01-2014
2|Polo|12-01-2014|13-01-2014
2|Polo|13-01-2014|14-01-2014
2|Polo|14-01-2014|15-01-2014
2|Polo|15-01-2014|16-01-2014
2|Polo|16-01-2014|17-01-2014
2|Polo|17-01-2014|18-01-2014
2|Polo|18-01-2014|19-01-2014
2|Polo|19-01-2014|20-01-2014
2|Polo|20-01-2014|21-01-2014
2|Polo|21-01-2014|22-01-2014
2|Polo|22-01-2014|23-01-2014
2|Polo|23-01-2014|24-01-2014
2|Polo|24-01-2014|25-01-2014
2|Polo|25-01-2014|26-01-2014
2|Polo|26-01-2014|27-01-2014
2|Polo|27-01-2014|28-01-2014
2|Polo|28-01-2014|29-01-2014
2|Polo|29-01-2014|30-01-2014
2|Polo|30-01-2014|31-01-2014
2|Polo|31-01-2014|01-02-2014