Here’s a handy reference table for the common Talend components.
Use this document as a reference to understand what types of flows act as input and output.| Input | Component | Component Description | Output |
| · Row.Iterate · Trigger |  | tPostgressqlConnection | · Trigger |
| · Row.Main |  | tMap map input to output columns derive columns perform transformations | · Row.Main |
| · Row.Main |  | tLogRow used as data viewer and debugging print input data in the Run window | · Row.Main · Trigger |
| · Row.Main |  | tPostgresqlOutput used to insert input data into the database | · Row.Main · Trigger |
| · Row.Iterate · Trigger |  | tFileList This outputs an iterative list of files read from a location. The input can be from a trigger or from another row.iterate. | · Row.Main · Trigger |
| · Row.Iterate · Trigger |  | tFileInputDelimited reads data into the job so that the field attributes / schema can be further transformed | · Row.Main · Row.Iterate · Trigger |
| · Row.Iterate · Trigger |  | tFileInputJSON reads data from a location. presents this data / schema to the job for further transformations. | · Row.Main · Row.Iterate · Trigger |
| · Row.Main |  | tFileOutputDelimited used to write data to a file in a specified location | · Row.Main · Trigger |
| · Row.Iterate · Row.Main · Trigger |  | tJava used to run arbitrary java code, to help with bespoke transformations. can be used to set values to context variables, or to print messages back to the run window to help debugging the job. | · Row.Main · Row.Iterate · Trigger |
| · Row.Iterate · Row.Main |  | tExtractJSONField used to split key:value pair data from a field / string | · Row.Main · Row.Iterate · Trigger |
| · Row.Iterate |  | tIterateToFlow converts row.iterate to a row.main | · Row.Main · Trigger |
| · Row.Main |  | tFlowToIterate converts row.main to a row.iterate | · Row.Iterate · Trigger |
| · Row.Iterate · Trigger |  | tS3Connection creates a connection to AWS S3 | · Trigger |
| · Row.Iterate · Trigger |  | tS3List used to list the objects in S3 bucket outputs this list for iteration | · Row.Iterate · Trigger |
| · Row.Iterate · Trigger |  | tS3Get used to download the objects from s3 to a location | · Trigger |
| · Row.Iterate · Trigger |  | tHashOutput used to load row.main data flow into local cache | · Row.Iterate · Row.Main · Trigger |
| · Row.Main |  | tHashInput used to retrieve data from local cache for further transformation within the job | · Row.Main · Trigger |
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