# tDB2Row Acts on the actual DB structure or on the data (although without handling data) depending on the nature of the query and the database. The SQLBuilder tool helps you write easily your SQL statements. tDB2Row 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. ## tDB2Row Standard properties These properties are used to configure tDB2Row running in the Standard Job framework. The Standard tDB2Row component belongs to the Databases family. The component in this framework is available in all Talend products. Information noteNote: 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 [DB Generic components](https://help.qlik.com/talend/r/en-US/8.0/components/db-generic/db-generic-component). ## Basic settings | Properties | Description | | --- | --- | | Database | Select the desired database type from the list and click
Apply. | | Use an existing connection | Select this check box and in the Component
List drop-down list, select the desired connection component to
reuse the connection details you already defined.

Information noteNote: When a Job contains the parent Job and the child Job, do the following if you
want to share an existing connection between the parent Job and the child Job (for example,
to share the connection created by the parent Job with the child Job).

In the parent level, register the database connection to be shared in the Basic settings view of the connection component which creates that very database connection.
In the child level, use a dedicated connection component to read that registered database connection.

For an example about how to share a database connection across Job levels,
see [Sharing a database connection](https://help.qlik.com/talend/r/en-US/7.3/studio-user-guide/sharing-database-connection). | | 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.

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: The schema is created and stored locally for this component only. For more information about a component schema in its Basic settings tab, see Basic settings tab.
Repository: The schema already exists and is stored in the Repository, hence can be reused. For more information about a component schema in its Basic settings tab, see Basic settings tab.
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 |

Either Built-in or Repository .
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. | | Specify a data source alias | Select this checkbox and specify the alias of a data source created on the *Talend Runtime* side to use the shared connection pool defined in the data source configuration. This
option works only when you deploy and run your Job in *Talend Runtime*.

This checkbox is not available when the Use an existing
connection checkbox is selected. | | Data source alias | Enter the alias of the data source created on the *Talend Runtime* side.

This field is available only when the Specify a data
source alias checkbox is selected. | | 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 | Properties | Description | | --- | --- | | Additional JDBC parameters | Specify additional connection properties for the DB connection you
are creating.

Information noteNote:

You can set the encoding parameters through this field. | | 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.

Information noteNote:

This option allows the component to have a different schema
from that of the preceding component. Moreover, the column that
holds the QUERY's recordset should be set to the type of
*Object* and this component
is usually followed by tParseRecordSet. | | 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. | | 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.

Information noteNote:

This option is very useful if you need to execute the same
query several times. Performance levels are increased | | tStatCatcher Statistics | Select this check box to collect log data at the component
level. | ## Global Variables | Variables | Description | | --- | --- | | Global Variables | QUERY: the 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 checkbox is
cleared, if the component has this checkbox.

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 more information about variables, see [Using contexts and variables](https://help.qlik.com/talend/r/en-US/8.0/studio-user-guide/contexts-and-variables). | ## Usage | Usage guidance | Description | | --- | --- | | **Usage rule** | This component offers the flexibility of the DB query and covers
all possible SQL queries. | | Dynamic settings | Click the [+] button to add a row in the table
and fill the Code field with a context
variable to choose your database connection dynamically from multiple
connections planned in your Job. This feature is useful when you need to
access database tables having the same data structure but in different
databases, especially when you are working in an environment where you
cannot change your Job settings, for example, when your Job has to be
deployed and executed independent of Talend Studio.

The Dynamic settings table is
available only when the Use an existing
connection check box is selected in the Basic settings view. Once a dynamic parameter is
defined, the Component List box in the
Basic settings view becomes unusable.

For examples on using dynamic parameters, see [Reading data from databases through
context-based dynamic connections](https://help.qlik.com/talend/r/en-US/8.0/components/defining-context-groups/reading-data-from-databases-through-context-based-dynamic-connections) and [Reading data from different MySQL databases
using dynamically loaded connection parameters](https://help.qlik.com/talend/r/en-US/8.0/components/context/reading-data-from-different-mysql-databases-using-dynamically-loaded-connection-parameters). For more information on
Dynamic settings and context variables, see
[Dynamic schema](https://help.qlik.com/talend/r/en-US/8.0/studio-user-guide/dynamic-schema) and [Creating a context group and define context
variables in it](https://help.qlik.com/talend/r/en-US/8.0/studio-user-guide/creating-context-group-and-define-context-variables-in-it). |