Caché SQL Reference
Deletes a trigger.
DROP TRIGGER name FROM table
||The name of the trigger to be deleted.
||Optional The table the trigger is to be deleted from. If the FROM clause is not specified, the entire schema is searched for the named trigger.
The DROP TRIGGER
command is a privileged operation. Prior to using DROP TRIGGER
it is necessary for your process to have %DROP_TRIGGER administrative privilege. Failing to do so results in an SQLCODE 99 error (Privilege Violation). You can use the GRANT
command to assign %DROP_TRIGGER privileges, if you hold appropriate granting privileges.
The DROP TRIGGER
statement acquires a table-level lock on table
. This prevents other processes from modifying the table’s data. This lock is automatically released at the conclusion of the DROP TRIGGER
A trigger and its table must reside in the same schema. A trigger name may be qualified or unqualified. If unqualified, the trigger schema defaults to the table schema, as specified in the FROM clause. If there is no FROM clause, or the table name is unqualified, the trigger schema defaults to the system default schema. If both the trigger name and the table name are qualified, they must both specify the same schema or Caché issues an SQLCODE -366 error.
In Caché SQL, a trigger name must be unique within its schema for a specific table. Thus it is possible to have more than one trigger in a schema with the same name. The optional FROM clause is used to determine which trigger to delete:
If no FROM clause is specified, and Caché locates a unique trigger in the schema that matches the specified name, Caché deletes the trigger.
If a FROM clause is specified, and Caché locates a unique trigger in the schema that matches both the specified name and the FROM table name, Caché deletes the trigger.
If no FROM clause is specified, and Caché locates more than one trigger that matches the specified name, Caché issues an SQLCODE -365 error.
If Caché locates no trigger that matches the specified name, either for the table specified in the FROM clause or, if there is no FROM clause, for any table in the schema, Caché issues an SQLCODE -363 error.
The following example deletes a trigger named Trigger_1 associated with any table in the default schema (usually SQLUser
is the default schema):
The following example deletes a trigger named Trigger_2 associated with any table in the A schema.
The following example deletes a trigger named Trigger_3 associated with the Patient table in the default schema. If a trigger named Trigger_3 is found, but it is not associated with Patient, Caché issues an SQLCODE -363 error.
DROP TRIGGER Trigger_3 FROM Patient
The following examples all delete a trigger named Trigger_4 associated with the Patient table in the Test schema.
DROP TRIGGER Test.Trigger_4 FROM Patient
DROP TRIGGER Trigger_4 FROM Test.Patient
DROP TRIGGER Test.Trigger_4 FROM Test.Patient