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ASP.NET Code Generator
Wednesday, August 20, 2008PrintSubscribe
Alternative Unique Key Fix

Code OnTime Generator is using a collection of queries to interrogate a database schema when any code generator project involving database interaction is generated. File [My Documents]\Code OnTime\Library\_Config \CodeOnTime.ModelMap.xml defines a collection of queries that are used to discover the database metadata. Data provider System.Data.SqlClient  has an entry named PrimaryKeyColumns that was incorrectly determining the primary key columns. The query has been retrieving both primary keys and alternative unique keys. Alternative unique keys should be ignored.

Generated projects were treating fields included in the alternative unique keys as if they were the fields of the primary key.

We have replaced the query with the following:

select kcu.*
from information_schema.key_column_usage kcu 
    inner join information_schema.table_constraints tc on
        kcu.constraint_catalog = tc.constraint_catalog and
        kcu.constraint_schema = tc.constraint_schema and
        kcu.constraint_name = tc.constraint_name 
where 
    tc.constraint_type = 'PRIMARY KEY'

The fix has been deployed. Simply start CodeOnTime.exe and you will be prompted to download the update.

If you do have a database table with any fields included in a UNIQUE INDEX then open you project and proceed to the Database Connection section of your project. There is a link "Click here if your database has changed and you would like to refresh the cached metadata." Click on the link to reset the metadata and generate the project again. The problem will go away.

Sunday, August 3, 2008PrintSubscribe
Database Lookups and Data Aquarium Framework Updates

The latest updates of code generator projects include standard project Database Lookups for ASP.NET and AJAX 3.5 and premium project Data Aquarium Framework.

Database Lookups project has been changed to make SelectedValue property a default property of the control. Java script components were updated to eliminate the problem with the loss of focus in a web form when a data lookup window has been closed. DataViewLookup control will now work without script errors when included in the content template of UpdatePanel control.

Data Aquarium Framework has been updated to include the same fixes described above. Addition components are now generated to make integration of the framework with existing ASP.NET applications a snap. Component ControllerDataSource has been introduced to tap into the power of Data Aquarium Framework to generate dynamic SQL statements on the fly. Now you can connect your existing data views, including GridView, DetailView, and FormView, to this data source control and gain instant ability to page and sort through thousands of records, and provide sophisticated filtering capabilities to end users. Use any commercial web control library that supports standard data binding with Data Aquarium Framework. New control DataViewTextBox is based on the standard TextBox and provides no-code database auto complete for your web forms.

See a demo application that showcases the latest features at http://dev.codeontime.com/demo/integration.

Download the source code of the sample page here.

Saturday, July 26, 2008PrintSubscribe
GUI of Web Form Builder Applications

Here we will show many of the available features of an application generated with Web Form Builder code generator project.

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Sorting

On the left side of the screen, you can see all the database objects discovered in your database. Clicking on an item will bring you to a list of records contained in the table. At the bottom of the list, you can page through the records by clicking on a page number. Sorting is done by clicking on the column header you wish to sort by. First click sorts in ascending order, and second click sorts in descending order. Sorting and paging are executed via client callbacks, eliminating the need for post backs, and speeding up your application.

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Filtering

To create a filter, press Filter, which is located directly above the record list. A drop down and text field will appear. Select which field you wish to filter from the drop down, type in the filter criteria, and press Apply. The records will filter by your selection. Any partial or full filter will work. To remove your filter, press Cancel.

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You can also use a comma to apply multiple filters, and comparison operators to further specify your filter. After applying a filter, you can still sort and page. If you choose to visit another page and return, the filter will remain, saving a lot of time. If you cancel your filter, but want to reapply it, the most recent filter will be remembered when you press Filter again.

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Detail View

If you click on the first field of a record, you will be sent to the detail view of the record. All the information about the record is displayed here, as well as all the related child records. On the detail record lists, filtering and sorting is still available to you. You can edit the record by pressing Edit, delete by pressing Delete, and create a new record by pressing New.

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Editing Records

When you press Edit, the form switches into editing mode. Here, you can change many of the fields. Lookup values are represented as drop down controls. Read-only lookup fields are automatically inferred from your database and correspond to the editable lookup fields of your record. When you finish editing, press Update to save all changes, or press Cancel to go back without saving. You can also click on any of the objects on the left to go straight to their respective record lists without changing.

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If you try to delete certain records which causes database constraint violation, the command will be canceled and an error message will appear. This can occur because the record can have associated child records, as in the example below.

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Creating New Records

To create a new record, first go to the database object in which you would like to have the new record in. Press the link where it says "Click here to create a new record." The new record screen will appear, and now you can add values to all the editable fields, and set values to lookup fields with drop down controls. Press Insert to create your new record, or Cancel to go back to the previous screen without saving. Notice that when fields with database constraints are incorrectly entered, an error message will appear.

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Generating Reports

The second option above the records list allows you to generate reports of the current database object. Pressing PDF creates an Adobe PDF report. Pressing Excel creates an excel report. Image creates a .tiff file of the report. On all of these, a multi-page list will be created, showing all the fields for all the records. The date created and page number will be shown at the bottom. Report title and column headers are displayed for all of the pages. All fields are available for report generating, including those in master-detail pages. Any filters applied to the record list will also be applied to the generated report.

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PDF report:

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Excel report:

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Image report:

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This is just a short preview of some of the great user interface features that Web Form Builder applications generated with Code OnTime Generator have to offer. Find more useful resources on our support page.