tDeltaLakeRow Standard properties

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.

Connection Component

Select the the component whose connection you want to reuse from the drop-down list.

JDBC URL

The JDBC URL of the Delta Lake database to be used, which begins with jdbc:spark:// (already presented). See section Configure JDBC URL at JDBC and ODBC drivers and configuration parameters for related information.

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 this component, the driver jar SparkJDBC42-2.6.14.1018.jar is required and is added by default.

For more information, see Importing a database driver.

Driver Class

Enter the class name for the specified driver between double quotation marks. For the SparkJDBC42-2.6.14.1018.jar driver, the name to be entered is com.simba.spark.jdbc.Driver (already presented).

User Id and Password

The database user authentication data. See section Username and password authentication at JDBC and ODBC drivers and configuration parameters for related information.

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.

Table Name

The name of the table to be processed.

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.

Guess Query

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

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.

If you use the component's own DB configuration, your data source connection will be closed at the end of the component. To prevent this from happening, use a shared DB connection with the data source alias specified.

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

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 connection.

Propagate QUERY's recordset

Select this check box to propagate the result of the query to the output flow. From the use column list displayed, you need to select a column into which the query result will be inserted.

This option allows the component to have a different schema from that of the preceding component. Moreover, the column that holds the query's recordset should be set to the Object type and this component is usually followed by a tParseRecordSet component.

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.

Commit every

Specify the number of rows to be processed before committing batches of rows together into the database.

This option ensures transaction quality (but not rollback) and, above all, better performance at executions.

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.

QUERY

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

Usage rule

This component offers the flexibility of the DB query for any database using a DeltaLake connection and covers all possible SQL queries.

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.