Schema and Edit schema

A schema is a row description. It defines the number of fields
(columns) to be processed and passed on to the next component. When you create a Spark
Job, avoid the reserved word line when naming the
fields.

Click Edit
schema to make changes to the schema. If the current schema is of the Repository type, three options are available:

• View schema: choose this
  option to view the schema only.

• Change to built-in property:
  choose this option to change the schema to Built-in for local changes.

• Update repository connection:
  choose this option to change the schema stored in the repository and decide whether
  to propagate the changes to all the Jobs upon completion. If you just want to
  propagate the changes to the current Job, you can select No upon completion and choose this schema metadata
  again in the Repository Content
  window.

Click Sync
columns to retrieve the schema from the previous component connected in the
Job.

This
component offers the advantage of the dynamic schema feature. This allows you to
retrieve unknown columns from source files or to copy batches of columns from a source
without mapping each column individually. For further information about dynamic schemas,
see
Talend Studio

User Guide.

This
dynamic schema feature is designed for the purpose of retrieving unknown columns of a
table and is recommended to be used for this purpose only; it is not recommended for the
use of creating tables.

Bulk File Path

Specify the path to the file to be generated.

Append

Select this check box to append new data at the end of the file if it
already exists, instead of overwriting the existing data.

Ignore Null

Select this check box to ignore NULL values.

Click the
[+] button to add lines as needed and specify
the external ID fields in the input flow, the lookup relationship fields in the upsert
module, the lookup module as well as the external ID fields in the lookup module.

• Column name of Talend Schema:
  the name of the external ID field in the input flow. It refers to the fields in the
  schema of the preceding component. Such columns are intended to match against the
  external ID fields specified in the External id
  name column, which are the fields of the lookup module specified in the
  Module name column.

• Lookup relationship field name:
  the name of the lookup relationship field. It refers to the lookup
  relationship fields of the module specified in the Module Name field in the Basic settings view of the tSalesforceBulkExec component and is
  intended to establish relationship with the lookup module specified in
  the Module name column in this
  table. For how to define the lookup relationship fields and how to
  provide their correct names in the Lookup
  relationship field name field, go to the Salesforce
  website and launch the Salesforce Data Loader application for proper
  actions and information.

• Module name: the name of the lookup module.

• Polymorphic: select this check box when and only when
  polymorphic fields are used for relationship mapping. You will get an error if you keep
  this check box cleared for a polymorphic field or select it for a field that is not
  polymorphic. For more information about the polymorphic fields, search polymorphic at http://www.salesforce.com/us/developer/docs/api_asynch/.

• External id name: the name of the external ID
  field in the lookup module specified in the Module
  name column.

tStatCatcher Statistics

Select this check box to gather the Job processing metadata at the Job level
as well as at each component level.

NB_LINE

The number of rows processed. This is an After variable and it returns an integer.

ERROR_MESSAGE

The error message generated by the component when an error occurs. This is an After
variable and it returns a string.

Usage rule

This component is more commonly used with the tSalesforceBulkExec component. Used together,
they gain performance while feeding or modifying information in
Salesforce.com.