U3 - PLSQL - TRIGGERS - conceptos basicos

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Orlando Giron

PLSQL - TRIGGERS

Tecnología

Ing.
Orlando
Girón
CREACION DE TRIGGERS
2
Los triggers son subprogramas que se disp
aran frente a eventos que ocurren en
la base de datos.
Los tipos de trigger son:
• Simple DML triggers (BEFORE, AFTER y INSTE
AD OF).
• Compound triggers.
• Non DML triggers (DDL & Database events).

Ing.
Orlando
Girón
3
Los triggers de tipo simple dml son aquellos que se dispa
ran cuando ocurre una
operación DML y dependiendo del momento que desee
mos que se dispare antes o después de la transacción o
reemplazar la transacción por otro código.
TRABAJANDO CON TRIGGERS

Ing.
Orlando
Girón
4
FOR EACH ROW
Respecto a FOR EACH ROW, significa que el trigger se disparará por
cada fila que esté siendo afectado por la transacción.
Se detalla una comparación entre tener y no tener habilitado el FOR
EACH ROW.

Ing.
Orlando
Girón
Ejecución
Se muestra a continuación un cuadro que muestra cuando tenemos
disponibles las variables :NEW y :OLD.
Los triggers de tipo: INSTEAD OF nos permite reemplazar
una transacción por una acción diferente.

Ing.
Orlando
Girón
RESTRICCIONES
• Los triggers no pueden ser creados en el
esquema SYS.
• Los triggers no pueden confirmar o anular una
transacción

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U3 - PLSQL - TRIGGERS - conceptos basicos

1. Ing. Orlando Girón Unidad3: PLSQL TRIGGERS 1

2. Ing. Orlando Girón CREACION DE TRIGGERS 2 Los triggers son subprogramas que se disp aran frente a eventos que ocurren en la base de datos. Los tipos de trigger son: • Simple DML triggers (BEFORE, AFTER y INSTE AD OF). • Compound triggers. • Non DML triggers (DDL & Database events).

3. Ing. Orlando Girón 3 Los triggers de tipo simple dml son aquellos que se dispa ran cuando ocurre una operación DML y dependiendo del momento que desee mos que se dispare antes o después de la transacción o reemplazar la transacción por otro código. TRABAJANDO CON TRIGGERS

4. Ing. Orlando Girón 4 FOR EACH ROW Respecto a FOR EACH ROW, significa que el trigger se disparará por cada fila que esté siendo afectado por la transacción. Se detalla una comparación entre tener y no tener habilitado el FOR EACH ROW.

5. Ing. Orlando Girón EJEMPLO 1 5

6. Ing. Orlando Girón EJEMPLO 2 6

7. Ing. Orlando Girón EJEMPLO 2 7

8. Ing. Orlando Girón EJEMPLO 2

9. Ing. Orlando Girón Ejecución Se muestra a continuación un cuadro que muestra cuando tenemos disponibles las variables :NEW y :OLD. Los triggers de tipo: INSTEAD OF nos permite reemplazar una transacción por una acción diferente.

10. Ing. Orlando Girón Ejecución

11. Ing. Orlando Girón RESTRICCIONES • Los triggers no pueden ser creados en el esquema SYS. • Los triggers no pueden confirmar o anular una transacción

U3 - PLSQL - TRIGGERS - conceptos basicos

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U3 - PLSQL - TRIGGERS - conceptos basicos