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Edson Eduardo
Martínez
Contreras
DISPARADORES
 El trabajo del disparador es analizar los eventos para
determinar su naturaleza y entonces enviarlos al
manejador adecuado que es capaz de trabajar con
eventos de esa naturaleza. El disparador tiene que
procesar un flujo de eventos, así que su lógica debe
incluir un bucle de eventos para poder enviar un evento
a un manejador y volver a escuchar a la espera de
nuevos eventos que disparar.
DISPARADOR
 UN DISPARADOR O TRIGGER es un procedimiento que se
ejecuta cuando se cumple una condición establecida al
realizar una operación.
 Existen varios tipos de disparadores, dependiendo del tipo de
transacción de disparo y el nivel en el que se ejecuta el
disparador
DISPARADOR
Componentes principales
La estructura básica de un trigger es:
 Llamada de activación: es la sentencia que permite "disparar"
el código a ejecutar.
 Restricción: es la condición necesaria para realizar el código.
Esta restricción puede ser de tipo condicional o de tipo
nulidad.
 Acción a ejecutar: es la secuencia de instrucciones a ejecutar
una vez que se han cumplido las condiciones iniciales.
DISPARADOR

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Disparadores

  • 2.  El trabajo del disparador es analizar los eventos para determinar su naturaleza y entonces enviarlos al manejador adecuado que es capaz de trabajar con eventos de esa naturaleza. El disparador tiene que procesar un flujo de eventos, así que su lógica debe incluir un bucle de eventos para poder enviar un evento a un manejador y volver a escuchar a la espera de nuevos eventos que disparar. DISPARADOR
  • 3.  UN DISPARADOR O TRIGGER es un procedimiento que se ejecuta cuando se cumple una condición establecida al realizar una operación.  Existen varios tipos de disparadores, dependiendo del tipo de transacción de disparo y el nivel en el que se ejecuta el disparador DISPARADOR
  • 4. Componentes principales La estructura básica de un trigger es:  Llamada de activación: es la sentencia que permite "disparar" el código a ejecutar.  Restricción: es la condición necesaria para realizar el código. Esta restricción puede ser de tipo condicional o de tipo nulidad.  Acción a ejecutar: es la secuencia de instrucciones a ejecutar una vez que se han cumplido las condiciones iniciales. DISPARADOR