Select a type of database from the list and click
Apply.

Property Type

Select the way the connection details
will be set.

• Built-In: The connection details will be set
  locally for this component. You need to specify the values for all
  related connection properties manually.

• Repository: The connection details stored
  centrally in Repository > Metadata will be reused by this component. You need to click
  the […] button next to it and in the pop-up
  Repository Content dialog box, select the
  connection details to be reused, and all related connection
  properties will be automatically filled in.

This property is not available when other connection component is selected
from the Connection Component drop-down list.

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.

Connection Component

Select the component that opens the database connection to be reused by this
component.

JDBC URL

The JDBC URL of the database to be used. For
example, the JDBC URL for the Amazon Redshift database is jdbc:redshift://endpoint:port/database.

Drivers

Complete this table to load the driver JARs needed. To do
this, click the [+] button under the table to add
as many rows as needed, each row for a driver JAR, then select the cell and click the
[…] button at the right side of the cell to
open the Module dialog box from which you can select the driver JAR
to be used. For example, the driver jar RedshiftJDBC41-1.1.13.1013.jar for the Redshift database.

For more information, see Importing a database driver.

Driver Class

Enter the class name for the specified driver between double
quotation marks. For example, for the RedshiftJDBC41-1.1.13.1013.jar driver, the name to be entered is
com.amazon.redshift.jdbc41.Driver.

Use Id and Password

The database 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
(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: You create and store the schema locally for this component
  only.

• Repository: You have already created the schema and stored it in the
  Repository. You can reuse it in various projects and Job designs.

• 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.

This
component offers the advantage of the dynamic schema feature. This allows you to
retrieve unknown columns from source files or to copy batches of columns from a source
without mapping each column individually. For further information about dynamic schemas,
see
Talend Studio

User Guide.

This
dynamic schema feature is designed for the purpose of retrieving unknown columns of a
table and is recommended to be used for this purpose only; it is not recommended for the
use of creating tables.

Table Name

The name of the table from which data will be retrieved.

Query Type and Query

Specify the database query statement paying particularly attention to the
properly sequence of the fields which must correspond to the schema definition.

• Built-In: Fill in the query statement in the
  Query field manually or click the
  […] button next to the Query field
  to build the statement graphically using the SQLBuilder.

• Repository: Select the relevant query stored in the
  Repository by clicking the […] button next to it and in the
  pop-up Repository Content dialog box, select the query to be
  used, and the Query field will be automatically filled
  in.

If using the dynamic schema feature, the SELECT query must
include the * wildcard, to retrieve all of the
columns from the table selected.

Guess Query

Click this button to generate query in the Query field based on
the defined table and schema.

Guess Schema

Click this button to generate schema columns based on the query defined in the
Query field.

Specify a data source alias

Select this check box and in the
Data source alias field displayed, specify the alias of
a data source created on 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 property is not available when other connection component is selected from
the Connection Component drop-down list.

Use cursor

Select this check box to specify the number of rows you want to work with at
any given time. This option optimises performance.

Trim all the String/Char columns

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

Check column to trim

Select the check box for corresponding column to remove leading whitespace
and trailing whitespace from it.

This property is not available when the Trim all the String/Char
columns check box is selected.

Enable Mapping File for
Dynamic

Select this check box to use the specified metadata
mapping file when reading data from a dynamic type column. This check
box is cleared by default.

With this check box selected, you can specify the metadata mapping file
to use by selecting a type of database from the Mapping
File drop-down list.

For more information about metadata mapping files, see
the section on type conversion of Talend Studio User Guide.

Use PreparedStatement

Select this check box if you want to query the database using a prepared statement. In
the Set PreparedStatement Parameters table displayed, specify the
value for each parameter represented by a question mark ? in the
SQL statement defined in the Query field.

• Parameter Index: the position of the parameter in the SQL
  statement.

• Parameter Type: the data type of the parameter.

• Parameter Value: the value of the parameter.

For a related use case of this property, see Using PreparedStatement objects to query data.

tStatCatcher Statistics

Select this check box to gather the Job processing metadata at the Job level
as well as at each component level.

ERROR_MESSAGE

The error message generated by the component when an error occurs. This is an After
variable and it returns a string.

NB_LINE

The number of rows processed. This is an After variable and it returns an integer.

QUERY

The query statement being processed. This is a Flow variable and it returns a
string.

Usage rule

This component covers all possible SQL queries for any
database using a JDBC connection.

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.

For examples on using dynamic parameters, see Reading data from databases through context-based dynamic connections and Reading data from different MySQL databases using dynamically loaded connection parameters. For more information on Dynamic
settings and context variables, see Talend Studio
User Guide.