tMaxDBRow - 6.1

Talend Components Reference Guide

EnrichVersion
6.1
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Talend Big Data
Talend Big Data Platform
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Talend Data Integration
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task
Data Governance
Data Quality and Preparation
Design and Development
EnrichPlatform
Talend Studio

tMaxDBRow properties

Component family

Databases/MaxDB

 

Function

tMaxDBRow is the specific component for this database query. It executes the SQL query stated onto the specified database. The row suffix means the component implements a flow in the job design although it doesn't provide output.

Purpose

Depending on the nature of the query and the database, tMaxDBRow acts on the actual DB structure or on the data (although without handling data). The SQLBuilder tool helps you write easily your SQL statements.

Basic settings

Property type

Either Built-in or Repository.

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

 

 

Built-in: No property data stored centrally.

 

 

Repository: Select the repository file in which the properties are stored. The fields that follow are completed automatically using the data retrieved.

 

Host

Database server IP address

 

Port

Listening port number of DB server.

 

Database

Name of the database.

 

Username and Password

DB user authentication data.

To enter the password, click the [...] button next to the password field, and then in the pop-up dialog box enter the password between double quotes and click OK to save the settings.

 

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. The schema is either Built-In or stored remotely in the Repository.

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

 

 

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.

  

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.

 

Table name

Type in the table name.

 

Query type

The query can be Built-in for a particular Job, or for commonly used query, it can be stored in the Repository to ease the query reuse.

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

  

Built-in: Fill in manually the query statement or build it graphically using SQLBuilder.

  

Repository: Select the relevant query stored in the Repository. The Query field gets accordingly filled in.

 

Query

Enter your DB query paying particularly attention to properly sequence the fields in order to match the schema definition.

 

Guess Query

Click the Guess Query button to generate the query which corresponds to your table schema in the Query field.

 

Die on error

This check box is selected by default. Clear the check box to skip the row on error and complete the process for error-free rows. If needed, you can retrieve the rows on error via a Row > Rejects link.

Advanced settings

Propagate QUERY's recordset

Select this check box to insert the result of the query into a COLUMN of the current flow. Select this column from the use column list.

 

Use PreparedStatement

Select this check box if you want to query the database using a PreparedStatement. In the Set PreparedStatement Parameter table, define the parameters represented by "?" in the SQL instruction of the Query field in the Basic Settings tab.

Parameter Index: Enter the parameter position in the SQL instruction.

Parameter Type: Enter the parameter type.

Parameter Value: Enter the parameter value.

Note

This option is very useful if you need to execute the same query several times. Performance levels are increased

 

Commit every

Number of rows to be completed before committing batches of rows together into the DB. This option ensures transaction quality (but not rollback) and above all better performance on executions.

 

tStat Catcher Statistics

Select this check box to collect log data at the component level.

Global Variables

QUERY: the SQL 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 offers the flexibility benefit of the DB query and covers all possible SQL queries.

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.

Limitation

This component requires installation of its related jar files. For more information about the installation of these missing jar files, see the section describing how to configure the Studio of the Talend Installation Guide.