tMysqlOutputBulk properties - 6.1

Talend Components Reference Guide

EnrichVersion
6.1
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Talend Big Data
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task
Data Governance
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Talend Studio

The tMysqlOutputBulk and tMysqlBulkExec components are used together in a two step process. In the first step, an output file is generated. In the second step, this file is used in the INSERT statement used to feed a database. These two steps are fused together in the tMysqlOutputBulkExec component, detailed in a separate section. The advantage of using two separate steps is that the data can be transformed before it is loaded in the database.

Component family

Databases/MySQL

 

Function

Writes a file with columns based on the defined delimiter and the MySql standards

Purpose

Prepares the file to be used as parameter in the INSERT query to feed the MySQL database.

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.

 

File Name

Name of the file to be generated.

This file is generated on the same machine where the Studio is installed or where the Job using tMysqlOutputBulk is deployed.

 

Append

Select this check box to add the new rows at the end of the file

 

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: You create and store the schema locally for this component only. Related topic: see Talend Studio User Guide.

 

 

Repository: You have already created the schema and stored it in the Repository. You can reuse it in various projects and Job designs. Related topic: see Talend Studio User Guide.

When the schema to be reused has default values that are integers or functions, ensure that these default values are not enclosed within quotation marks. If they are, you must remove the quotation marks manually.

For more details, see https://help.talend.com/display/KB/Verifying+default+values+in+a+retrieved+schema.

  

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.

Advanced settings

Row separator

String (ex: "\n" on Unix) to distinguish rows.

 

Field separator

Character, string or regular expression to separate fields.

 

Text enclosure

Character used to enclose the text.

 

Create directory if does not exist

This check box is selected by default. It creates a directory to hold the output table if required.

 

Custom the flush buffer size

Customize the amount of memory used to temporarily store output data. In the Row number field, enter the number of rows after which the memory is to be freed again.

 

Records contain NULL value

This check box is selected by default. It allows you to take account of NULL value fields. If you clear the check box, the NULL values will automatically be replaced with empty values.

 

Check disk space

Select the this check box to throw an exception during execution if the disk is full.

 

Encoding

Select the encoding from the list or select Custom and define it manually. This field is compulsory for DB data handling.

 

tStatCatcher Statistics

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

Global Variables 

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. 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 to be used along with tMySQlBulkExec component. Used together they offer gains in performance while feeding a MySQL database.

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

Due to license incompatibility, one or more JARs required to use this component are not provided. You can install the missing JARs for this particular component by clicking the Install button on the Component tab view. You can also find out and add all missing JARs easily on the Modules tab in the Integration perspective of your studio. For details, see https://help.talend.com/display/KB/How+to+install+external+modules+in+the+Talend+products or the section describing how to configure the Studio in the Talend Installation Guide.