A PL/SQL trigger is a named database object that encapsulates and defines a set of actions that are to be performed in response to an insert, update, or delete operation against a table. Triggers are created us
For DELETE operations, the return value should be OLD.The return value of a row-level trigger fired AFTER or a statement-level trigger fired BEFORE or AFTERis always ignored; it might as well be null. However, any of these types of triggers might still abort the entire operation by raisin...
触发事件:即在何种情况下触发Trigger;例如:insert,update,delete。 触发时间:即在Trigger是在触发时间发生之前(before)还是之后(after)触发,也就是触发事件和该trigger的操作顺序。 触发器本身:即该trigger被触发后的目的和意图,正是触发器本身要做的事情。例如:pl/sql块。 触发频率:说明触发器内定义的动作被执行的...
PL/SQL Triggers - Learn about PL/SQL triggers, their types, and how to use them effectively in your database applications.
select*fromBANK_TRANSACTIONS;Copy select*fromBANK_TRANSACTIONS_AUDIT;Copy References Oracle – CREATE TRIGGER Statement Oracle – PL/SQL Triggers CategoriesoracleTagsbefore update,oracle,plsql,trigger
PL/SQL Triggers A trigger is a PL/SQL block which will run automatically whenever an event occurs. PL/SQL block may be associated with a table, a view or to a database. A trigger is a procedure that is triggered automatically when on the table that is created is executed a command ...
2.1 Check the trigger status : SELECTTRIGGER_NAME,STATUSFROMUSER_TRIGGERSwhereupper(TRIGGER_NAME)='TRG_DROP_EXAMPLE';Copy 2.2 Delete the trigger. DROPTRIGGERtrg_drop_example;-- output-- Trigger trg_drop_example dropped.Copy 2.3 Check the status again. ...
INSTEAD OF triggers on views. System triggers on DATABASE or SCHEMA: With DATABASE, triggers fire for each event for all users; with SCHEMA, triggers fire for each event for that specific user. Related articles PL/SQL – Complex Queries (Job Interviews) (srinimf.com) PL/SQL – Difficult...
This Oracle tutorial explains how to create a BEFORE INSERT Trigger in Oracle with syntax and examples. A BEFORE INSERT Trigger means that Oracle will fire this trigger before the INSERT operation is executed.
This Oracle tutorial explains how to create an AFTER INSERT Trigger in Oracle with syntax and examples. An AFTER INSERT Trigger means that Oracle will fire this trigger after the INSERT operation is executed.