tExasolOutput Standard properties

Select the desired database type from the list and click Apply.

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 database connection fields that follow are completed automatically using the data retrieved.

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 Centralizing database metadata.

Use an existing connection

Select this check box and from the list displayed select the relevant connection component to reuse the connection details you have already defined.

Host

Enter the host or host list of the Exasol database servers. Exasol can run in a cluster environment. The valid value can be a simple IP address (for example, 172.16.173.128), an IP range list (for example, 172.16.173.128..130 that represents three servers 172.16.173.128, 172.16.173.129, and 172.16.173.130), or a comma-separated host list (for example, server1,server2,server3) of the Exasol database cluster.

Port

Enter the listening port number of the Exasol database cluster.

Schema name

Enter the name of the schema you want to use.

Username and Password

Enter the user authentication data to access the Exasol database.

To enter the password, click the [...] button next to the password field, enter the password in double quotes in the pop-up dialog box, and click OK to save the settings.

Table

Enter the name of the table to be written. Note that only one table can be written at a time.

Action on table

On the table defined, you can perform one of the following operations:

• None: No operation is carried out.

• Drop and create table: The table is removed and created again.

• Create table: The table does not exist and gets created.

• Create table if does not exist: The table is created if it does not exist.

• Drop table if exists and create: The table is removed if it already exists and created again.

• Clear table: The table content is deleted.

• Truncate table: The table content is deleted. You don not have the possibility to rollback the operation.

Action on data

On the data of the table defined, you can perform:

• Insert: Add new entries to the table. If duplicates are found, Job stops.

• Update: Make changes to existing entries.

  Information noteNote: In cases where all the schema columns are set as keys, this action yields an error and the Job fails.
• Insert or update: Insert a new record. If the record with the given reference already exists, an update would be made.

  Information noteNote: In cases where all the schema columns are set as keys, this action yields a warning message and the Job continues.
• Update or insert: Update the record with the given reference. If the record does not exist, a new record would be inserted.

  Information noteNote: In cases where all the schema columns are set as keys, this action yields a warning message and the Job continues.

• Delete: Remove entries corresponding to the input flow.

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.

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.

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 Dynamic schema.

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.

When the schema to be reused has default values that are integers or functions, ensure that these default values are not enclosed within quotation marks. If they are, you must remove the quotation marks manually.

For more information, see Retrieving table schemas.

Die on error

Select the check box to stop the execution of the Job when an error occurs.

Clear the check box to skip any rows on error and complete the process for error-free rows. When errors are skipped, you can collect the rows on error using a Row > Reject link.

Use commit control

Select this box to display the Commit every field in which you can define the number of rows to be processed before committing.

Additional JDBC parameters

Specify additional connection properties for the database connection you are creating. The properties are separated by semicolon and each property is a key-value pair, for example, encryption=1;clientname=Talend.

This field is not available if the Use an existing connection check box is selected.

Additional Columns

This option is not offered if you create (with or without drop) the DB table. This option allows you to call SQL functions to perform actions on columns, which are not insert, nor update or delete actions, or action that require particular preprocessing.

• Name: Enter the name of the column to be modified or inserted.

• SQL expression: Enter the SQL expression to be executed to modify or insert data in the corresponding columns.

• Position: Select Before, After or Replace, depending on the action to be carried out on the reference column.

• Reference column: Type in a column of reference that can be used to place or replace the new or altered column.

Use field options

Select this check box to customize a request for the corresponding column, particularly if multiple actions are being carried out on the data.

• Key in update: Select the check box for the corresponding column based on which the data is updated.

• Key in delete: Select the check box for the corresponding column based on which the data is deleted.

• Updatable: Select the check box if the data in the corresponding column can be updated.

• Insertable: Select the check box if the data in the corresponding column can be inserted.

Select this check box to display each step during processing entries in a database.

Use batch mode

Select this check box to activate the batch mode for data processing, and in the Batch Size field displayed enter the number of records to be processed in each batch.

tStatCatcher Statistics

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

Global Variables 

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

NB_LINE_UPDATED: the number of rows updated. This is an After variable and it returns an integer.

NB_LINE_INSERTED: the number of rows inserted. This is an After variable and it returns an integer.

NB_LINE_DELETED: the number of rows deleted. This is an After variable and it returns an integer.

NB_LINE_REJECTED: the number of rows rejected. This is an After variable and it returns an integer.

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 more information about variables, see Using contexts and variables.

Usage rule

This component offers the flexibility benefit of the DB query and covers all of the SQL queries possible.

This component must be used as an output component. It allows you to carry out actions on a table or on the data of a table in an Exasol database. It also allows you to create a reject flow using a Row > Rejects link to filter data in error. For a related scenario, see Retrieving data in error with a Reject link.

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 and Reading data from different MySQL databases using dynamically loaded connection parameters. For more information on Dynamic settings and context variables, see Dynamic schema and Creating a context group and define context variables in it.

Limitation

Due to license incompatibility, one or more JARs required to use this component are not provided. You can install the missing JARs for this particular component by clicking the Install button on the Component tab view. You can also find out and add all missing JARs easily on the Modules tab in the Integration perspective of Talend Studio. For details, see Installing external modules.