How to convert string to integer in BIRT after fetching it from the database?

问题

I use BIRT for reports and i am a beginner BIRT user. In my report i must calculate the average of a column. (database is an oracle)

In my open script I have sth. like this:

sqlText = "select A, B, C, D, ((date1-date2) day to second) as differencedate from problem";

difference date column values are like this: 0 0:22:15 and in my fetch I have

if (!maximoDataSet.fetch())
    return (false);

row["A"] = maximoDataSet.getString("A");
row["B"] = maximoDataSet.getDate("B");
....    

row["differencedate"]=maximoDataSet.getString("differencedate");

return (true);

I tried to split the string and get the seconds from the differencedate and convert it to integer using plain JavaScript but I am getting an error like "split null" etc. So my question is how can i convert this column to integer in BIRT?

回答1:

Try retrieving the date difference from the database as a number - like so:

select A, B, C, D, 
       ((date1-date2) day to second) as differencedate,
       (date1-date2) * 86400 as differenceseconds
from problem

来源：https://stackoverflow.com/questions/12971579/how-to-convert-string-to-integer-in-birt-after-fetching-it-from-the-database