IDataLayer.SchemaInit Event

When implemented by a class, this event will occur when the data schema is initialized or updated.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v23.2.dll

NuGet Packages: DevExpress.Win.PivotGrid, DevExpress.Win.TreeMap, DevExpress.Xpo

NuGet Package: DevExpress.Xpo

Declaration

C#

event SchemaInitEventHandler SchemaInit

VB.NET

Event SchemaInit As SchemaInitEventHandler

Event Data

The SchemaInit event's data class is SchemaInitEventArgs. The following properties provide information specific to this event:

Property	Description
Command	Gets an SQL statement which can be executed while connected to an SQL data source.
Table	Gets an object metadata the schema for which has been created in storage.

Remarks

C#

private static void DataLayer_SchemaInit(object sender, SchemaInitEventArgs e) {
    if (e.Table.ClassType == typeof(User)) {
        XPMemberInfo firstNameColumn = e.Table.FindMember("FirstName");
        e.Command.CommandText = String.Format(
          "alter table [{0}] alter column [{1}] nvarchar({2}) collate Latin1_General_CS_AS",
          e.Table.TableName, firstNameColumn.MappingField, firstNameColumn.MappingFieldSize
        );
        e.Command.ExecuteNonQuery();
    }
}

VB.NET

Private Shared Sub DataLayer_SchemaInit(ByVal sender As Object, ByVal e As SchemaInitEventArgs)
  If e.Table.ClassType Is GetType(User) Then
    Dim firstNameColumn As XPMemberInfo = e.Table.FindMember("FirstName")
    e.Command.CommandText = String.Format( _
      "alter table [{0}] alter column [{1}] nvarchar({2}) collate Latin1_General_CS_AS", _ 
      e.Table.TableName, firstNameColumn.MappingField, firstNameColumn.MappingFieldSize _
    )
    e.Command.ExecuteNonQuery()
  End If
End Sub