Edit database queries
You do not have to select a node to edit database queries using this dialog. You can create new expressions or delete and edit existing expressions.
To select a database query
- In the Edit menu, select the Edit database query item.
- On the left-hand side of the Edit database queries dialog, mark a database query list.
- Perform one of the following tasks:
- Overwrite the database expression name in the Identifier.
- Enter explanatory text in Description.
- Edit the SQL expression.
- Select or de-select other dialog groups.
- Select or de-select all dialog groups.
- Test the expression by clicking on Test statement... and enter a parameter value in the next dialog.
- Save the changes.
Loading a historical object state
You can reset the state of a database object in a collection if you have enable recording of historical data in the database.
To reset a database object to a previous state
- Add a database collection.
For more information, see "Database objects" as a collection.
- Add the Load objects including history action to an action node.
- At this node, select the collect.
- Choose between two options:
- Select Load objects including history to load historical object statuses for an individual object.
Here you can enter an object key (XObjectKey) that uniquely identifies the object.
- Select Load table with history to load historical table data.
You can enter a column name and its value as restriction criteria.
NOTE: Once historical object states are loaded as described, you can simply set the collection to any point in time within the loaded time period.
- Add the action Set object to historical state on the action node.
- Select the collection.
- Enter the date under Date.
The collection is set to the state that was current at that time.
Loading a change history
A change history contain a list of all operations recorded on a defined amount of data. You can load a change history into a special collection type designed for the purpose.
To define a collection for a change history
- Open the module or component to which to add the collection.
- Select the Collections node by right-clicking on it.
- Select the Change history option.
- Enter the name for the new collection in Identifier.
- In the Type field, select the type of change history.
To load a change history
- Right-click to select an action node.
- Select the Load change history action.
- Under Collection, select a collection.
- In the Type field, select the type of change history defined for the collection.
NOTE: The setting in Type must be identical for the collection and the change history to be loaded.
- Enter the date up to which you want to load the change history in Load historical data back to (date).
- Select one of the following scenarios to continue:
- To load the change history of an individual object, enter the Web SQL expression of the (XObjectKey) object key of the required object.
- Enter the relevant table name to load the change history for a table or an assignment object.
NOTE: Optionally, you can specify the column name and the value for a filter condition.
View definitions
A collection layer view behaves in the same way as a database layer view. The content of the view is defined with a Web SQL expression. The view is updated during runtime. The view is automatically updated if the source data changes.
To add a view
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Select the Collections node by right-clicking on them.
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Select the Add collection data view action.
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In the Identifier field, enter your name for the new collection.
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In the View expression field, enter the Web SQL expression for representing the view content.
NOTE: Add a property with the matching data type for every view property in Web Designer.
