tOleDbInput – Docs for ESB 5.x

Component family

Databases/OleDb

Function

This component reads a database and extracts fields based on a query. It offers the
flexibility benefit of the DB query and covers all possible SQL
queries.

Purpose

This component 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

Connection URL

Enter the connection string used to open the database. For details, please see http://msdn.microsoft.com/en-us/library/system.data.oledb.oledbconnection.connectionstring.aspx.

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

Enter the name of the table to be processed.

Query Type

Select either Built-in or Repository query type from the drop-down
list.

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.

Guess Query

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

Guess schema

Click the button to retrieve the schema from the table.

Query

Specify the database query paying particularly attention to properly sequence the
fields in order to match the schema definition.

Advanced settings

Trim all the String/Char columns

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

Trim column

Select the check box in Trim column to remove leading
and trailing whitespace from the corresponding column.

This field appears only when the Trim all
the String/Char columns check box is cleared.

tStatCatcher Statistics

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

Global Variables

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

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 is used as a start component in a Job and it always needs an output
link.

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.