Creating a trigger to only run when a new table is being created

问题

I know that I can use this to create DDL create trigger;

CREATE OR REPLACE TRIGGER 
  create_table_trigger
  AFTER CREATE ON SCHEMA
DECLARE
BEGIN
END;

Problem is this trigger would run on DDLs like 'Create sequence'; how can I only execute this for 'Create Table' DDLs?

回答1:

CREATE OR REPLACE TRIGGER 
  create_table_trigger
  AFTER CREATE ON SCHEMA
BEGIN
  IF SYS.DICTIONARY_OBJ_TYPE = 'TABLE' THEN
      ....
END;

For a list of EVENT attributes, refer to this page
http://ist.marshall.edu/ist480adbp/plsql_triggers.html (link is down)

Wayback machine link to the contents of the dead link above: https://web.archive.org/web/20110809071133/http://ist.marshall.edu/ist480adbp/plsql_triggers.html

As far as I know, dictionary_obj_type is one of TABLE|SEQUENCE|PROCEDURE|INDEX|FUNCTION|TYPE|PACKAGE

And dictionary_obj_name is just the name of the table/sequence/proc/etc.

• dictionary_obj_type Returns the type of the dictionary object on which the DDL operation that fired the trigger occurred.
• dictionary_obj_name Returns the name of the dictionary object on which the DDL operation that fired the trigger occurred.

来源：https://stackoverflow.com/questions/4812412/creating-a-trigger-to-only-run-when-a-new-table-is-being-created