Multiple ternary expressions

This is how to use Talend to concatenate multiple columns (fields) into one field neatly.

Say we have three fields, row1.field1, row1.field2, row1.field3 that we want to insert into a output.notes column.

In the tMap component, use the following expression:

(StringHandling.LEN(row1.field1) > 0 ? "Field 1: "+row1.field1+" " : "")+(StringHandling.LEN(row1.field2) > 0 ? "Field 2 "+row1.field2+" " : "" )+(StringHandling.LEN(row1.field3) > 0 ? "Field 3 Address: "+row1.Address+", "+row1.Suburb+", "+row1.State+", "+row1.Pcode+" " : "")

What this does is check to see if field1 has anything in it (i.e. has a length longer than 0), if it does, it adds the field and a space after it to buffer it against the next field. If it doesn’t, then it doesn’t insert anything. It then does the same for fields 2 and 3.

Updated 2014-01-30 12h49m to put the code in a html code block and fix the double quotes which had been ‘smartly’ but wrongly changed.

Using a ternary operator in Talend Open Studio

I’m currently preparing some data for import into SugarCRM for a client. The source data has a column that contains the given names (i.e. “Jane Mary”) and a second column containing the surname (i.e. “Doe”).

Using Talend Open Studio we want to separate the given names into first_name and middle_names columns. So, how do we split the first name and middle name?

By using in the tMap component an expression.

For the first name, we do this:


StringHandling.INDEX(row1.GivenNames," ") > 0 ? StringHandling.LEFT(row1.GivenNames,StringHandling.INDEX(row1.GivenNames," ")) : row1.GivenNames

And to extract the middle name/s we use this expression:


StringHandling.INDEX(row1.GivenNames," ") > 0 ? StringHandling.RIGHT(row1.GivenNames,StringHandling.LEN(row1.GivenNames)-StringHandling.INDEX(row1.GivenNames," ")–1) : ""

This type of expression are known as a ternary operationsee examples.

The basic format of a ternary operation is this:

test condition ? do this if true : do this if false