tSQLTemplateMerge properties - 6.3

Talend Open Studio for Big Data Components Reference Guide

EnrichVersion
6.3
EnrichProdName
Talend Open Studio for Big Data
task
Data Governance
Data Quality and Preparation
Design and Development
EnrichPlatform
Talend Studio

Component family

ELT/SQLTemplate

 

Basic settings

Database Type

Select the type of database you want to work on from the drop-down list.

 

Component list

Select the relevant DB connection component from the list if you use more than one connection in the current Job.

 

Source table name

Name of the database table holding the data you want to merge into the target table.

 

Target table name

Name of the table you want to merge data into.

 

Schema and Edit schema

This component involves two schemas: source schema and target schema.

A schema is a row description, that is to say, it defines the number of fields to be processed and passed on to the next component. The schema is either built-in or remotely stored in the Repository.

Since version 5.6, both the Built-In mode and the Repository mode are available in any of the Talend solutions.

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.

 

 

Built-in: The schema is created and stored locally for this component only. Related topic: see Talend Studio User Guide.

 

 

Repository: The schema already exists and is stored in the Repository, hence can be reused. Related topic: see Talend Studio User Guide.

 

Merge ON

Specify the target and source columns you want to use as the primary keys.

 

Use UPDATE (WHEN MATCHED)

Select this check box to update existing records. With the check box selected, the UPDATE Columns table appears, allowing you to define the columns in which records are to be updated.

 

Specify additional output columns

Select this check box to update records in additional columns other than those listed in the UPDATE Columns table. With this check box selected, the Additional UPDATE Columns table appears, allowing you to specify additional columns.

 

Specify UPDATE WHERE clause

Select this check box and type in a WHERE clause in the WHERE clause field to filter data during the update operation.

Note

This option may not work with certain database versions, including Oracle 9i.

 

Use INSERT (WHEN MATCHED)

Select this check box to insert new records. With the check box selected, the INSERT Columns table appears, allowing you to specify the columns to be involved in the insert operation.

 

Specify additional output columns

Select this check box to insert records to additional columns other than those listed in the INSERT Columns table. With this check box selected, the Additional INSERT Columns table appears, allowing you to specify additional columns.

 

Specify INSERT WHERE clause

Select this check box and type in a WHERE clause in the WHERE clause field to filter data during the insert operation.

Note

This option may not work with certain database versions, including Oracle 9i.

Advanced settings

tStatCatcher Statistics

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

SQL Template

SQL Template List

To add a default system SQL template: Click the Add button to add the default system SQL template(s) in the SQL Template List.

Click in the SQL template field and then click the arrow to display the system SQL template list. Select the desired system SQL template provided by Talend.

Note: You can create your own SQL template and add them to the SQL Template List.

To create a user-defined SQL template:

-Select a system template from the SQL Template list and click on its code in the code box. You will be prompted by the system to create a new template.

-Click Yes to open the SQL template wizard.

-Define your new SQL template in the corresponding fields and click Finish to close the wizard. An SQL template editor opens where you can enter the template code.

-Click the Add button to add the new created template to the SQL Template list.

For more information, see Talend Studio User Guide.

Global Variables

NB_LINE: the number of rows read by an input component or transferred to an output component. This is an After variable and it returns an integer.

NB_LINE_MERGED: the number of rows merged. This is an After variable and it returns an integer.

QUERY: the query statement being processed. This is a Flow variable and it returns a string.

ERROR_MESSAGE: the error message generated by the component when an error occurs. This is an After variable and it returns a string. This variable functions only if the Die on error check box is cleared, if the component has this check box.

A Flow variable functions during the execution of a component while an After variable functions after the execution of the component.

To fill up a field or expression with a variable, press Ctrl + Space to access the variable list and choose the variable to use from it.

For further information about variables, see Talend Studio User Guide.

Usage

This component is used as an intermediate component with other relevant DB components, especially the DB connection and commit components.

Log4j

If you are using a subscription-based version of the Studio, the activity of this component can be logged using the log4j feature. For more information on this feature, see Talend Studio User Guide.

For more information on the log4j logging levels, see the Apache documentation at http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Level.html.