public static void FireTriggers(this IQueryContext context, TableEventContext tableEvent)
{
var manager = context.Session().Transaction.GetTriggerManager();
if (manager == null)
return;
manager.FireTriggers(context, tableEvent);
}
public void FireTriggers(IQueryContext context, TableEventContext tableEvent)
{
if (!transaction.TableExists(SystemSchema.TriggerTableName))
return;
BuildTriggerCache();
foreach (var trigger in triggerCache) {
if (trigger.CanInvoke(tableEvent))
trigger.Invoke(context, tableEvent);
}
}
public static void FireTrigger(this IQueryContext context, TableEventContext tableEvent)
{
var eventSource = tableEvent.Table.FullName;
var eventType = tableEvent.EventType;
var triggers = context.Session.FindTriggers(eventSource, eventType);
foreach (var trigger in triggers) {
try {
trigger.Fire(tableEvent);
var oldRowId = tableEvent.OldRowId;
var newRow = tableEvent.NewRow;
var triggerEvent = new TriggerEvent(trigger.TriggerName, eventSource, eventType, oldRowId, newRow);
context.RegisterEvent(triggerEvent);
} catch (Exception) {
// TODO: throw a specialized exception
throw;
}
}
}
public void Fire(TableEventContext context)
{
if (context == null)
throw new ArgumentNullException("context");
if (ShouldFire(context)) {
}
}
private bool ShouldFire(TableEventContext context)
{
if ((TriggerInfo.EventType & context.EventType) == 0)
return false;
var tableName = context.Table.TableInfo.TableName;
return TriggerInfo.TableName == null ||
TriggerInfo.TableName.Equals(tableName, true);
}
private void FireTrigger(IQueryContext context, TableEventContext tableEvent)
{
if (TriggerType == TriggerType.Callback) {
NotifyTriggerEvent(context, tableEvent);
} else {
ExecuteProcedure(context);
}
}
private void NotifyTriggerEvent(IQueryContext context, TableEventContext tableEvent)
{
var tableName = tableEvent.Table.FullName;
var eventType = tableEvent.EventType;
var triggerEvent = new TriggerEvent(context.Session, TriggerName, tableName, eventType, tableEvent.OldRowId,
tableEvent.NewRow);
context.RegisterEvent(triggerEvent);
}
public bool CanInvoke(TableEventContext context)
{
if ((TriggerInfo.EventType & context.EventType) == 0)
return false;
var tableName = context.Table.TableInfo.TableName;
return TriggerInfo.TableName == null ||
TriggerInfo.TableName.Equals(tableName, true);
}
public void Invoke(IQueryContext context, TableEventContext tableEvent)
{
var isBefore = (tableEvent.EventType & TriggerEventType.Before) != 0;
var transaction = context.Session.Transaction;
if (transaction is ITableStateHandler) {
var stateHandler = (ITableStateHandler) transaction;
var oldState = stateHandler.TableState;
var newState = new OldNewTableState(tableEvent.Table.FullName, tableEvent.OldRowId.RowNumber, tableEvent.NewRow,
isBefore);
stateHandler.SetTableState(newState);
try {
FireTrigger(context, tableEvent);
} finally {
stateHandler.SetTableState(oldState);
}
} else {
FireTrigger(context, tableEvent);
}
}
public TableEventException(TableEventContext tableEvent)
: this(tableEvent, FormMessage(tableEvent))
{
}
private static string FormMessage(TableEventContext tableEvent)
{
return String.Format("An error occurred when firing triggers '{0}' on '{1}'.", tableEvent.EventType.AsString(),
tableEvent.Table.FullName);
}
public TableEventException(TableEventContext tableEvent, string message, Exception innerException)
: base(-1, message, innerException)
{
TableName = tableEvent.Table.FullName;
EventType = tableEvent.EventType;
}
public TableEventException(TableEventContext tableEvent, string message)
: this(tableEvent, message, null)
{
}
public TableEventException(TableEventContext tableEvent, Exception innerException)
: this(tableEvent, FormMessage(tableEvent), innerException)
{
}
