ksqlDB

The ksqlDB connector allows executing ksqlDB pull queries and terminating push queries.

NOTE	Pull queries fetch the current state of a materialized view which is incrementally updated as new events arrive.

 

Steps:

1.     Select ksqlDB from the Data Sources pane. The ksqlDB Settings pane and the retrieved ksqlDB source are displayed.

 

2.      Enter the Name of the ksqlDB data source, then click .

3.      Enter the following properties:

Property	Description
Server URL	ksqlDB host address.
Username	User Id that will be used to connect to ksqlDB.
Password	Password that will be used to connect to ksqlDB.

 

4.     Check the Collection box to enable and select either:

·         Stream

Immutable and append-only collections which are useful for representing a series of historical facts. Adding multiple events with the same key allows these events to be appended to the end of the stream.

·         Table

Mutable collections. Adding multiple events with the same key allows the table to only keep the value for the last key. This collection is helpful in modeling change over time and often used to represent aggregations.

5.     Click    to populate the drop-down list. Select the collection.

6.     Enter an SQL-like query language into the Query box.

7.     Check the From Beginning box to subscribe from the beginning to the latest messages.

If un-checked, you will only be subscribed to the latest messages.

8.     Enter the Timeout. Default is 5 (in seconds).

9.     Select either the dot (.) or comma (,) as the Decimal Separator.

10.    Click  to the fetch the schema based on the connection details. Consequently, the list of columns with the data type found from inspecting the first ‘n’ rows of the input data source is populated and the Save button is enabled.

11.   You can also opt to load or save a copy of the column definition.  

12.   Click . A new column entry displays. Enter or select the following properties:

Property	Description
Name	The column name of the source schema.
Type	The data type of the column. Can be a Text, Numeric, or Time
Date Format	The format when the data type is Time.
Enabled	Determines whether the message should be processed.

 

To delete a column, check its  or all the column entries, check the topmost , then click .

13.   Date/Time values of output data and Date/Time inputs, where supported, is by default unchanged.

You can opt to define the Show in Timezone and Source Timezone settings.

14.   Set the row limit of the data set.

15.   Tap the Preview Selected Data Source slider to turn it on.

16.  Click  to display the data preview.