The preceding image shows the schema for the Student table. In SQL Server Object Explorer (SSOX), open the Student table designer by double-clicking the Student table.
For example, the following code requires the first character to be upper case and the remaining characters to be alphabetical: Visual Studio The RegularExpression attribute can be used to apply restrictions to the input. The StringLength attribute doesn't prevent a user from entering white space for a name. The minimum value has no impact on the database schema. The StringLength attribute also provides client-side and server-side validation. An example that sets the minimum string length is shown later. The code shown limits names to no more than 50 characters. The StringLength attribute specifies the minimum and maximum length of characters that are allowed in a data field. The StringLength attribute ĭata validation rules and validation error messages can be specified with attributes.
The DataType attribute conveys the semantics of the data as opposed to how to render it on a screen. It's generally a good idea to use the DataType attribute with the DisplayFormat attribute. The DisplayFormat attribute can be used by itself. For example, the currency symbol should generally not be displayed in an edit text box. Some fields shouldn't use ApplyFormatInEditMode. The ApplyFormatInEditMode setting specifies that the formatting should also be applied to the edit UI. The DisplayFormat attribute is used to explicitly specify the date format. By default, the date field is displayed according to the default formats based on the server's CultureInfo. Using ĭataType.Date doesn't specify the format of the date that's displayed. Replace the code in Models/Student.cs with the following code: using System For more information, see Many-to-many The Student entity In the preceding Dataedo diagram, the CourseInstructor is a join table created by Entity Framework.
To create a database diagram with Dataedo: The following database diagram was made with Dataedo: The completed data model is shown in the following illustration: