tDBSQLRow – Docs for ESB 5.x

Component family

Databases/DB Generic

Function

tDBSQLRow is the generic
component for 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 does not provide
output.

Purpose

Depending on the nature of the query and the database, tDBSQLRow acts on the actual DB structure
or on the data (although without handling data). The SQLBuilder tool
helps you write easily your SQL statements.

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.

Datasource

Name of the data source defined via the database connection
configuration wizard.

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.

Schema and Edit
Schema

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.

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.

Click Edit schema to make changes to the schema. If the
current schema is of the Repository type, three options are
available:

Table Name

Name of the source table where changes made to data should be
captured.

Query 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: 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.

Die on error

This check box is cleared by default, meaning to skip the row on
error and to complete the process for error-free rows. If needed,
you can retrieve the rows on error via a Row > Rejects
link.

Advanced settings

Additional JDBC parameters

Specify additional connection properties for the database
connection you are creating.

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.

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.

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.

tStatCatcher Statistics

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

Global Variables

QUERY: the SQL 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 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 offers the flexibility of the DB query and covers
all possible SQL queries.

Note that the relevant DBRow component should be preferred
according to your DBMSs. Most of the DBMSs have their specific DBRow
components.

Log4j

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.