This page provides guidance on how to use the Write to Data Store Entity smart service in the Process Modeler. The Write to Data Store Entity smart service is a powerful tool that allows you to easily insert or update data in your database from Appian.
The Write to Data Store Entity Smart Service adds process data to an entity in a Data Store. It allows you to select a single entity in a data store to save or update data.
Before you configure the Write to Data Store Entity smart service, you must first have two objects:
You'll need to reference both of these objects within the smart service. The way you define your CDT determines whether you can update existing data in the data store. See Updating existing values for more information.
When the activity is attended (requiring that a user perform a task), you can select the element or subelement of a CDT to store form data in your configuration of the interface. Data written to a data store using this activity must be supported in the XML 1.0 standard.
Unicode control characters, such as characters #x0 and #x1 through #x1F, are not fully supported in XML 1.0.
Any update on related data is based on the JPA annotations/database schema defined for the entity. For example, updating the parent in a one-to-many containment relationship also affects the children, but updating one side of a lookup relationship will not affect the related object.
Also note that any CDT created through the Data Type Designer or uploaded via an XSD file has the
cascade attribute set to
ALL on the child CDT by default. So unless you have manually changed this setting, updating a parent CDT value with this setting also affects the child value. Learn more about CDT Relationships.
The user executing this activity must have Viewer rights to the selected data store, in order to update or insert information.
Category: Data Services
Assignment Options: Attended
This section contains tab configuration details specific to this smart service. For more information about common configurations see the Process Node Properties page.
|Data Store Entity||Data Store Entity||The data store entity where you want to save your form data.||No||Yes|
In addition to the default node input, you must create a node input with the same custom data type (CDT) as the entity in the data store that you select.
For example, if the AT_Employee_DS data store entity uses the AT_employee CDT, the Write to Data Store Entity smart service must also have a node input that references the AT_employee CDT.
Additional node inputs can be created to store process data, but cannot save to the data store. Only the first node input mapped to a data store entity is saved.
|Name||System Data Type||Description|
|Stored Values||Any Type||The data successfully updated or stored in the database.|
You can create a new process variable to store the result or select an existing process variable from the available list.
If you use this smart service to add or update data in a database table, and that table is the source of a record type with data sync enabled, those changes will be automatically synced in Appian.
Depending on how your table data is structured in the CDT, the maximum number of rows that can be automatically synced will vary:
If you update more than the maximum number of rows, the smart service will successfully write to the data source, but the sync will fail.
If the smart service fails because there is an issue connecting to the database, like if VPN connection fails so you can't write your changes, Appian will automatically retry the smart service and the sync operation up to three times (with two seconds between each retry). After three attempts, the sync will fail and the record data will be unavailable.
See Troubleshooting Data Sync for more information on the different sync errors.
To update existing data, the field must have a primary key value. Otherwise, a new row of data will be inserted.
For example, if you want to update an employee record, you must pass the employee's
Id to the Write to Data Store Entity smart service. To do this, you can create a related action.
Related actions are links to process models that users can start directly from a record using information from that record. This allows you to pass an employee
Id into a start form so users can update the existing data for a specific employee. Then, when they click submit, it will pass the data from the start form to the Write to Data Store Entity smart service. The new values provided by the start form will overwrite the old values for that specific employee.
a!writeToDataStoreEntity( dataStoreEntity, valueToStore, onSuccess, onError )
Data Store Entity
The data store entity where you want to save your data.
The data value to create or update.
A list of saves or an HTTP response to execute after the smart service executes successfully. Created with
A list of saves or an HTTP response to execute when the smart service does not execute successfully. Created with
Since this smart service works directly with your data store and custom data types, be sure to note the Database Schema Best Practices before implementing.
For an example of how to configure a Write to Data Store Entity smart service in an interface, see the Use the Write to Data Store Entity Smart Service Function on an Interface pattern.
Can be used with Appian Portals if it is connected using an integration and web API.
|Sync-Time Custom Record Fields||Incompatible|
|Real-Time Custom Record Fields||Incompatible|
You cannot use this function to configure a process report.
You cannot use this function to configure a process event node, such as a start event or timer event.
Write to Data Store Entity Smart Service