talend - filename of output from a column value

问题

I have an existing job:

tDatabaseInput -> tMap -> tOutputDelimited

For the last component, I'll be needing the filename of the file to be based from one of the columns named TYPE (which is always the same for every row). The value for the column named TYPE is 'A1' which is the same for all the records in the database.

Thanks in advanced

回答1:

There is many ways to do it, but here is the simplest and more readable job :

tMySqlConnection_1 : Get a connection to the data base server
tMysqlInput_1: Query the table an get only the value like this :
```
select TYPE from my_table limit 1
```
tSetGlobalVar_1 : key = "file_name", value = (String)row1.type
tMysqlInput_2 : uqery the table as required
tMap_1 : map your data
tFileOutputDelimited_1 : filename = "C:\\Users\\KKL\\Desktop\\"+((String)globalMap.get("file_name"))

回答2:

You'll need two subjobs, as having a filename based on a column in your flow implies that this filename is extracted from another subjob.

You should have a first subjob getting the value of your column named TYPE into into a context variable

TDBInput->tJavaRow

TDBInput : just extract distinct TYPE column from your DB with a select query

tJavaRow : as you'll have only one row in the output, you can affect this value to a context variable : context.myVar=input_row.myColumn;

Then connect this first subjob to the second one (tDatabaseInput -> tMap -> tOutputDelimited)

, and use this context variable in your tFileOutputDelimited, in the filename field "/path/"+context.myVar+".ext"

来源：https://stackoverflow.com/questions/42666094/talend-filename-of-output-from-a-column-value

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