Code On Time: Database Lookups

Thursday, June 7, 2012Print Subscribe

Both name and id of a user selected in a lookup window can be captured in a database table when necessary. Let’s set up a lookup field to capture both properties of the user identity.

Start SQL Server Management Studio. In the Object Explorer, right-click Database / Northwind / Tables / dbo.Orders table node, and select Design option.

Add two columns with the following settings:

Column Name	Data Type	Allow Nulls
OwnerID	uniqueidentifier	True
OwnerName	nvarchar(50)	True

Save the table modification. Refresh the Orders controller.

Regenerate the project. Navigate to the Orders page, and edit a record. The OwnerID and OwnerName fields will be visible at the bottom of the form, but are currently only simple text boxes.

Let’s configure the OwnerID field as a User Id Lookup and have it copy the user name into OwnerName field. The OwnerName will become an alias of OwnerID data field. Only Administrators will be allowed to modify the owner of the record.

Start the Project Designer. In the Project Explorer, switch to the Controllers tab. Double-click on Orders / Fields / OwnerID field node.

Make the following changes:

Property	New Value
Items Style	User Id Lookup
Copy	OwnerName=UserName
“Write” Roles	Administrators

Press OK to save the field. In the Project Explorer, double-click on Orders / Views / editForm1 / c1 – Orders / OwnerID data field node.

Assign an alias for the data field:

Property	New Value
Alias	OwnerName

Press OK to save the data field. In the Project Explorer, right-click on Orders / Views / editForm1 / c1 – Orders / OwnerName data field node, and select Delete option.

Confirm the operation. On the toolbar, select Browse option to regenerate the web application.

Navigate to the Orders page, and edit a record. If your user account belongs to the Administrators role, then the field is rendered as a lookup.

Activate the lookup, and a lookup window will open and display a list of users.

Select a user from the lookup, and the name of the user will be copied into the field Owner Name.

Save the field. If you look at the record in the database, both UserId and UserName fields have been populated.

Labels: ASP.NET Membership, Database Lookups, Designer, Security, Tips and Tricks, Web Application Generator

Thursday, June 7, 2012Print Subscribe

Items Style–User Name Lookup

Data fields can be configured as a User Name Lookup to allow selection and insertion from the user names registered in the ASP.NET membership tables.

First, add an Owner column in the Orders table.

Start SQL Server Management Studio. In the Object Explorer, right-click on Databases / Northwind / Tables / dbo.Orders node, and select Design option.

Add the following column:

Column Name	Data Type	Allow Nulls
OwnerName	nvarchar(50)	True

Save the table design. Switch to Code On Time web application generator, and refresh the Orders controller.

Generate the application. Navigate to the Orders page, and select a record. The Owner Name field will just be a simple text box. Let’s convert this text box into a User Name Lookup.

Start the Project Designer. In the Project Explorer, switch to the Controllers tab. Double-click on Orders / Fields / OwnerName field node.

Change the Items Style property:

Property	New Value
Items Style	User Name Lookup

Press OK to save the field. On the toolbar, click Browse.

Navigate to the Orders page and edit a record. The Owner Name field will now be a lookup.

When you activate the lookup, a list of users will be displayed.

Select a user, and the user name will be inserted into the field.

Labels: Database Lookups, Security, Web Application Generator

Wednesday, June 6, 2012Print Subscribe

Using Alternative Views for Data Lookup

Lookup fields, when activated, display a view to allow the users to select an item. By default, the first grid view in the controller is used. Let’s create and use an alternate view for the CustomerID lookup field in the Orders controller.

Start the Project Designer. In the Project Explorer, switch to the Controllers tab. Right-click on Customers / Views and select New View option.

Configure the new view with the following values:

Property	Value
Id	grid2
Type	Grid
Command	command1
Label	Customers from USA
Header Text	This is a list of customers from the United States.
Filter Expression	Country='USA'

Press OK to save the view.

Next, add all data fields that exist in grid1 except Country. In the Project Explorer, right-click on Customers / Views / grid2 node, and select New Data Field option.

Specify the field name for the data field:

Property	Value
FieldName	CustomerID

Press OK to save the data field. Create the rest of the data fields:

Field Name

CompanyName

ContactName

ContactTitle

Address

City

Region

PostalCode

Phone

On the toolbar, press Browse. When the application starts in the web browser, navigate to Orders page. Edit a record, and activate the lookup for Customer Company Name.

The lookup window will display Customers (grid1) view. Click on the View dropdown on the right side of the action bar and select Customers from USA. The view grid2 will be displayed, showing only customers from USA. There will not be a Country column.

Let’s configure Orders.CustomerID lookup field to use grid2 by default. Switch back to the Project Designer. Double-click on Orders / Fields / CustomerID field node.

Change the Items Data View property:

Property	New Value
Items Data View	grid2

Press OK to save the field. To prevent users from selecting Customers from USA view on other pages, let’s remove the view from the view selector.

In the Project Explorer, double-click on Customers / Views / grid2 view node.

Prevent the view from showing up in the view selector:

Property	New Value
Show in View Selector	False

Press OK to save the view. On the toolbar, select Browse. Navigate to the Orders page, and edit a record. Activate the Customer Company Name lookup. The grid2 view will be displayed.

Labels: Database Lookups, Designer, Web Application Generator