tMaxDBRow – Docs for ESB 5.x

Component family

Databases/MaxDB

Function

tMaxDBRow 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.

Purpose

Depending on the nature of the query and the database, tMaxDBRow 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.

Host

Database server IP address

Port

Listening port number of DB server.

Database

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.

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: 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:

Table name

Type in the table name.

Query type

The query can be Built-in for a particular Job, or for commonly used
query, it can be stored in the Repository to ease the query reuse.

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.

Guess Query

Click the Guess Query button to generate the query
which corresponds to your table schema in the Query field.

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

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.

tStat
Catcher 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 benefit of the DB query and
covers all possible SQL queries.

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.

This component requires installation of its related jar files. For more information about the
installation of these missing jar files, see the section describing how to configure the
Studio of the Talend Installation and Upgrade Guide.