tHSQLDbInput properties - 6.1

Talend Components Reference Guide

EnrichVersion
6.1
EnrichProdName
Talend Big Data
Talend Big Data Platform
Talend Data Fabric
Talend Data Integration
Talend Data Management Platform
Talend Data Services Platform
Talend ESB
Talend MDM Platform
Talend Open Studio for Big Data
Talend Open Studio for Data Integration
Talend Open Studio for Data Quality
Talend Open Studio for ESB
Talend Open Studio for MDM
Talend Real-Time Big Data Platform
task
Data Governance
Data Quality and Preparation
Design and Development
EnrichPlatform
Talend Studio

Component family

Databases/HSQLDb

 

Function

tHSQLDbInput reads a database and extracts fields based on a query.

Purpose

tHSQLDbInput executes a DB query with a strictly defined order which must correspond to the schema definition. Then it passes on the field list to the next component via a Main row link.

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.

 

Click this icon to open a database connection wizard and store the database connection parameters you set in the component Basic settings view.

For more information about setting up and storing database connection parameters, see Talend Studio User Guide.

 

Running Mode

Select on the list the Server Mode corresponding to your DB setup among the four propositions :

HSQLDb Server, HSQLDb WebServer, HSQLDb In Process Persistent, HSQLDb In Memory.

 

Use TLS/SSL sockets

Select this check box to enable the secured mode if required.

 

Host

Database server IP address.

 

Port

Listening port number of DB server.

 

Database Alias

Alias 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.

 

DB path

Specify the directory to the database you want to connect to. This field is available only to the HSQLDb In Process Persistent running mode.

Note

By default, if the database you specify in this field does not exist, it will be created automatically. If you want to change this default set­ting, modify the connection parameter set in the Additional JDBC parameter field in the Advanced settings view

 

Db name

Enter the database name that you want to connect to. This field is available only to the HSQLDb In Process Persistent running mode and the HSQLDb In Memory running mode.

 

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.

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.

 

 

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.

 

Query type and Query

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

Warning

If using the dynamic schema feature, the SELECT query must include the * wildcard, to retrieve all of the columns from the table selected.

Advanced settings

Additional JDBC parameters

Specify additional connection properties for the DB connection you are creating. When the running mode is HSQLDb In Process Persistent , you can set the connection property ifexists=true to allow connection to an existing database only and avoid creating a new database.

 

Trim all the String/Char columns

Select this check box to remove leading and trailing whitespace from all the String/Char columns.

 

Trim column

Remove leading and trailing whitespace from defined columns.

 

tStat Catcher Statistics

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

Usage

This component covers all possible SQL queries for HSQLDb databases.

Global Variables

NB_LINE: Indicates the number of lines processed. This is an After variable and it returns an integer.

QUERY: Indicates the query to be processed. This is a Flow variable and it returns a string.

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

Note

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

Connections

Outgoing links (from this component to another):

Row: Main; Iterate

Trigger: Run if; On Component Ok; On Component Error; On Subjob Ok; On Subjob Error.

Incoming links (from one component to this one):

Row: Iterate;

Trigger: Run if; On Component Ok; On Component Error; On Subjob Ok; On Subjob Error.

For further information regarding connections, see Talend Studio User Guide.

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.