SqlTriggerContext SqlTriggerContext SqlTriggerContext SqlTriggerContext Class

Definition

Provides contextual information about the trigger that was fired.

public ref class SqlTriggerContext sealed
public sealed class SqlTriggerContext
type SqlTriggerContext = class
Public NotInheritable Class SqlTriggerContext
Inheritance
SqlTriggerContextSqlTriggerContextSqlTriggerContextSqlTriggerContext

Examples

The following example shows a SqlTriggerContext object being used to determine if an Insert action occurred. If a row was inserted into the user's table, the user name and real name are retrieved from the inserted row and then added to the UserNameAudit table.

[SqlTrigger(Name = @"UsersAudit", Target = "[dbo].[users]", Event = "FOR INSERT")]
public static void UsersAudit()
{
   // Get the trigger context.
   string userName;
   string realName;
   SqlCommand command;
   SqlTriggerContext triggContext = SqlContext.TriggerContext;
   SqlDataReader reader;
   
   switch (triggContext.TriggerAction)
   {
      case TriggerAction.Insert:

      // Retrieve the connection that the trigger is using.
      using (SqlConnection connection
         = new SqlConnection(@"context connection=true"))
      {
         connection.Open();
 
         // Get the inserted row.
         command = new SqlCommand(@"SELECT * FROM INSERTED;",
                                  connection);

         // Get the user name and real name of the inserted user.
         reader = command.ExecuteReader();
         reader.Read();
         userName = (string)reader[0];
         realName = (string)reader[1];
         reader.Close();

         // Insert the user name and real name into the auditing table.
         command = new SqlCommand(@"INSERT [dbo].[UserNameAudit] (userName, realName) " 
                  + @"VALUES (@userName, @realName);", connection);

         command.Parameters.Add(new SqlParameter("@userName", userName));
         command.Parameters.Add(new SqlParameter("@realName", realName));
               
         command.ExecuteNonQuery();               
            
      }
         
      break;
   }
}
<SqlTrigger(Name:="UsersAudit", Target:="[dbo].[users]", Event:="FOR INSERT")> _
Public Shared Sub UsersAudit()
        
   Dim command As SqlCommand
   Dim triggContext As SqlTriggerContext
   Dim reader As SqlDataReader
   Dim userName As String
   Dim realName As String

         
   ' Get the trigger context.
   triggContext = SqlContext.TriggerContext        

   Select Case triggContext.TriggerAction
           
      Case TriggerAction.Insert

         ' Retrieve the connection that the trigger is using.
         Using connection As New SqlConnection("context connection=true")
            connection.Open()

            ' Get the inserted row.
            command = new SqlCommand("SELECT * FROM INSERTED;", connection)
            
            ' Get the user name and real name of the inserted user.                
            reader = command.ExecuteReader()
            reader.Read()
            userName = CType(reader(0), String)
            realName = CType(reader(1), String)

            reader.Close()

            ' Insert the user name and real name into the auditing table.
            command = New SqlCommand("INSERT [dbo].[UserNameAudit] (userName, realName) " & _
               "VALUES (@userName, @realName);", connection)

            command.Parameters.Add(new SqlParameter("@userName", userName))
            command.Parameters.Add(new SqlParameter("@realName", realName))
                 
            command.ExecuteNonQuery()
                 
          End Using
         
   End Select

End Sub

Remarks

The contextual information provided includes the type of action that caused the trigger to fire, which columns were modified in an UPDATE operation, and, in the case of a data definition language (DDL) trigger, an XML EventData structure (see Transact-SQL Reference) that describes the triggering operation.

An instance of SqlTriggerContext is available from the SqlContext class, when the code is running inside a trigger through the TriggerContext property.

Properties

ColumnCount ColumnCount ColumnCount ColumnCount

Gets the number of columns contained by the data table bound to the trigger. This property is read-only.

EventData EventData EventData EventData

Gets the event data specific to the action that fired the trigger.

TriggerAction TriggerAction TriggerAction TriggerAction

Indicates what action fired the trigger.

Methods

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

Gets the Type of the current instance.

(Inherited from Object)
IsUpdatedColumn(Int32) IsUpdatedColumn(Int32) IsUpdatedColumn(Int32) IsUpdatedColumn(Int32)

Returns true if a column was affected by an INSERT or UPDATE statement.

MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

Returns a string that represents the current object.

(Inherited from Object)

Applies to