July 30, 2023

tMysqlOutputBulk – Docs for ESB 7.x

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tMysqlOutputBulk

Writes a file with columns based on the defined delimiter and the MySQL or Aurora
standards.

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.

tMysqlOutputBulk Standard properties

These properties are used to configure tMysqlOutputBulk running in the Standard Job framework.

The Standard
tMysqlOutputBulk component belongs to the Databases family.

The component in this framework is available in all Talend
products.

Note: This component is a specific version of a dynamic database
connector. The properties related to database settings vary depending on your database
type selection. For more information about dynamic database connectors, see Dynamic database components.

Basic settings

Database

Select a type of database from the list and click
Apply.

Property type

Either Built-in or
Repository
.

 

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. When you create a Spark
Job, avoid the reserved word line when naming the
fields.

 

Built-In: You create and store the schema locally for this component
only.

 

Repository: You have already created the schema and stored it in the
Repository. You can reuse it in various projects and Job designs.

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.

You can find more details about how to
verify default values in retrieved schema in Talend Help Center (https://help.talend.com).

 

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: ”
” 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

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

Usage rule

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

Component family

Databases/MySQL
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. You can find more details about how to install external modules in
Talend Help Center (https://help.talend.com).

Inserting transformed data in MySQL database

This scenario describes a four-component job which aims at fueling a database
with data contained in a file, including transformed data. Two steps are required in this job,
first step is to create the file, that will then be used in the second step. The first step
includes a tranformation phase of the data included in the file.

tMysqlOutputBulk_1.png

Dropping and linking components

  1. Drag and drop a tRowGenerator, a
    tMap, a tMysqlOutputBulk as well as a tMysqlBulkExec component.
  2. Connect the main flow using row Main
    links.
  3. And connect the start component (tRowgenerator in this example) to the tMysqlBulkExec using a trigger connection, of type OnComponentOk.

Configuring the components

  1. A tRowGenerator is used to generate
    random data. Double-click on the tRowGenerator
    component to launch the editor.
  2. Define the schema of the rows to be generated and the nature of data to
    generate. In this example, the clients file to be
    produced will contain the following columns: ID,
    First Name, Last Name,
    Address, City which all are
    defined as string data but the ID that is of integer type.

    tMysqlOutputBulk_2.png

    Some schema information don’t necessarily need to be displayed. To hide
    them away, click on Columns list button
    next to the toolbar, and uncheck the relevant entries, such as Precision or Parameters.
    Use the plus button to add as many columns to your schema
    definition.
    Click the Refresh button to preview the first generated row of your
    output.
  3. Then select the tMap component to set the
    transformation.
  4. Drag and drop all columns from the input table to the output table.

    tMysqlOutputBulk_3.png

  5. Apply the transformation on the LastName column by
    adding .toUpperCase() in its expression field.

    Then, click OK to validate the
    transformation.
  6. Double-click on the tMysqlOutputBulk
    component.
  7. Define the name of the file to be produced in File
    Name     field. If the delimited file information is stored in
    the Repository, select it in Property Type field, to retrieve relevant data.
    In this use case the file name is clients.txt.

    The schema is propagated from the tMap
    component, if you accepted it when prompted.
  8. In this example, don’t include the header information as the table should
    already contain it.
  9. Click OK to validate the output.
  10. Then double-click on the tMysqlBulkExec
    component to set the INSERT query to be executed.
  11. Define the database connection details. We recommend you to store
    this type of information in the Repository, so that you can retrieve them at any time
    for any Job.

    tMysqlOutputBulk_4.png

  12. Set the table to be filled in with the collected data, in the Table field.
  13. Fill in the column delimiters in the Field
    terminated by     area.
  14. Make sure the encoding corresponds to the data encoding.

Saving and executing the Job

  1. Press Ctrl+S to save your Job.
  2. Press F6 or click Run on the Run tab to
    execute the Job.

    tMysqlOutputBulk_5.png

    The clients database table is filled with data from
    the file including upper-case last name as transformed
    in the job.

For simple Insert operations that don’t include any transformations, the use of
tMysqlOutputBulkExec allows you to skip a step
in the process and thus improves performance.

Related topic: tMysqlOutputBulkExec Standard properties

Document get from Talend https://help.talend.com
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Docs 7.x
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