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Component family
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Databases/HSQLDb
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Function
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tHSQLDbOutput writes, updates,
makes changes or suppresses entries in a database.
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Purpose
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tHSQLDbOutput executes the action
defined on the table and/or on the data contained in the table,
based on the flow incoming from the preceding component in the Job.
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Basic settings
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Property type
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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.
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Built-in: No property data stored
centrally.
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Repository: Select the repository
file in which the properties are stored. The fields that follow are
completed automatically using the data retrieved.
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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.
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Running Mode
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Select on the list the Server Mode corresponding to your DB
setupamong the four propositions :
HSQLDb Server, HSQLDb WebServer, HSQLDb In Process Persistent, HSQLDb In Memory.
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Use TLS/SSL sockets
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Select this check box to enable the secured mode if
required.
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Host
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Database server IP address
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Port
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Listening port number of DB server.
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Database
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Name of the database
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Username and
Password
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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.
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DB path
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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
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Db name
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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.
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Table
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Name of the table to be written. Note that only one table can be
written at a time
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Action on table
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On the table defined, you can perform one of the following
operations:
None: No operation is carried
out.
Drop and create a table: The table
is removed and created again.
Create a table: The table does not
exist and gets created.
Create a table if not exists: The
table is created if it does not exist.
Drop a table if exists and create:
The table is removed if it already exists and created again.
Clear a table: The table content is
deleted.
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Action on data
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On the data of the table defined, you can perform:
Insert: Add new entries to the
table. If duplicates are found, Job stops.
Update: Make changes to existing
entries
Insert or update: Insert a new record. If the record with
the given reference already exists, an update would be made.
Update or insert: Update the record with the given
reference. If the record does not exist, a new record would be inserted.
Delete: Remove entries
corresponding to the input flow.
Warning
It is necessary to specify at least one
column as a primary key on which the Update and Delete operations are based. You can do that
by clicking Edit Schema and
selecting the check box(es) next to the column(s) you want
to set as primary key(s). For an advanced use, click the
Advanced settings view
where you can simultaneously define primary keys for the
Update and Delete operations. To do that:
Select the Use field
options check box and then in the Key in update column, select the
check boxes next to the column names you want to use as a
base for the Update operation. Do the same in the Key in delete column for the
Delete operation.
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Schema and Edit
schema
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A schema is a row description. It defines the number of fields 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.
Click Edit schema to make changes to the schema. If the
current schema is of the Repository type, three options are
available:
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View schema: choose this option to view the
schema only.
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Change to built-in property: choose this option
to change the schema to Built-in for local
changes.
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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.
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Built-In: You create and store the schema locally for this
component only. Related topic: see Talend Studio
User Guide.
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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.
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Die on error
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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.
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Advanced settings
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Additional JDBC parameters
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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.
Note
You can press Ctrl+Space to
access a list of predefined global variables.
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Commit every
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Enter the 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 at
execution.
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Additional Columns
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This option is not offered if you create (with or without drop)
the DB table. This option allows you to call SQL functions to
perform actions on columns, which are not insert, nor update or
delete actions, or action that require particular preprocessing.
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Name: Type in the name of the
schema column to be altered or inserted as new column
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SQL expression: Type in the SQL
statement to be executed in order to alter or insert the relevant
column data.
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Position: Select Before, Replace or After
following the action to be performed on the reference column.
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Reference column: Type in a
column of reference that the tDBOutput can use to place or replace the new or
altered column.
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Use field options
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Select this check box to customize a request, especially when
there is double action on data.
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Enable debug mode
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Select this check box to display each step during processing
entries in a database.
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tStat
Catcher Statistics
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Select this check box to collect log data at the component
level.
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Enable parallel execution
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Select this check box to perform high-speed data processing, by treating multiple data flows
simultaneously. Note that this feature depends on the database or the application ability to
handle multiple inserts in parallel as well as the number of CPU affected. In the Number of parallel executions field, either:
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Enter the number of parallel executions desired.
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Press Ctrl + Space and select the appropriate
context variable from the list. For further information, see Talend Studio
User Guide.
Note that when parallel execution is enabled, it is not possible to use global variables to
retrieve return values in a subjob.
Warning
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The Action on table
field is not available with the parallelization function. Therefore, you
must use a tCreateTable component if you
want to create a table.
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When parallel execution is enabled, it is not possible to use global
variables to retrieve return values in a subjob.
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Usage
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This component offers the flexibility benefit of the DB query and
covers all of the SQL queries possible.
This component must be used as an output component. It allows you
to carry out actions on a table or on the data of a table in a MySQL
database. It also allows you to create a reject flow using a
Row > Rejects link to filter
data in error. For an example of tMySqlOutput in use, see Scenario 3: Retrieve data in error with a Reject link.
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Global Variables
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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_UPDATED: the number of rows updated. This is an
After variable and it returns an integer.
NB_LINE_INSERTED: the number of rows inserted. This is an
After variable and it returns an integer.
NB_LINE_DELETED: the number of rows deleted. This is an
After variable and it returns an integer.
NB_LINE_REJECTED: the number of rows rejected. This is an
After variable and it returns an integer.
QUERY: the SQL query statement processed. This is an After
variable and it returns a string.
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.
A Flow variable functions during the execution of a component while an After variable
functions after the execution of the component.
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Connections
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Outgoing links (from this component to another):
Row: Main; Reject
Trigger: Run if; On Component Ok;
On Component Error; On Subjob Ok; On Subjob Error.
Incoming links (from one component to this one):
Row: Main;
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.
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Log4j
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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.
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Limitation
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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 and Upgrade
Guide.
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