Open Studio for Big Data
Open Studio for Data Integration
Open Studio for ESB
About this task
In this step, you will set the schema parameters.
The schema definition window is composed of four views:
|
View |
Description |
|---|---|
|
Source Schema |
Tree view of the JSON file. |
|
Target Schema |
Extraction and iteration information. |
|
Preview |
Preview of the target schema, together with the input data of the selected columns displayed in the defined order. |
|
File Viewer |
Preview of the JSON file's data. |
Procedure
-
Populate the Path loop expression field with
the absolute JsonPath or XPath expression, depending on the type of query you
have selected, for the node to be iterated upon. There are two ways to do this,
either:
-
enter the absolute JsonPath or XPath expression for the node to be iterated upon (enter the full expression or press Ctrl+Space to use the autocompletion list),
-
drag the loop element node from the tree view under Source schema into the Absolute path expression field of the Path loop expression table.
An orange arrow links the node to the corresponding expression.
Note: The Path loop expression definition is mandatory. -
-
Define the fields to be extracted by dragging the nodes from the Source Schema tree into the Relative or absolute path expression fields of the Fields to extract table.
Note: You can select several nodes to drop onto the table by pressing Ctrl or Shift and clicking the nodes of interest. -
If needed, you can add as many columns to be extracted as necessary, delete
columns or change the column order using the toolbar:
-
Add or delete a column using the [+] and x buttons.
-
Change the order of the columns using the
and 
buttons.
-
-
Click Refresh Preview to preview the target
schema. The fields are consequently displayed in the schema according to the
defined order.
