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...
Calling Procedures Within Triggers Rather than creating a large block of code within a trigger body, you can save the code as a stored procedure and call the procedure from within the trigger, by using the call command. For example, if you create an INSERT_BOOKSHELF_AUDIT_DUP procedure that...
In before update trigger, do not update theemployee_salarytable, it will create a recursively trigger and run until it has run out of memory. 1.2 Insert data to test the trigger. INSERT INTOemployee_salaryVALUES(101,15000,'Pranav');INSERT INTOemployee_salaryVALUES(201,40000,'Vikram');INSERT ...
In this example, we have created a trigger which will insert rows into an audit table before each updating of transaction table. Whenever user UPDATE data ofbank_transactions, the old data will be inserted intobank_transactions_auditby trigger for audit or backup purpose. 3.1 Create a bank tra...
Create Triger Example CREATE OR REPLACE TRIGGERmy_sal_changes BEFORE DELETE OR INSERT OR UPDATE ON Emp_tab FOR EACH ROW WHEN (new.Empno > 0) DECLARE sal_diff number; BEGIN sal_diff := :new.sal – :old.sal; dbms_output.put(‘Old salary: ‘ || :old.sal); ...
CREATE [OR REPLACE ] TRIGGER trigger_name {BEFORE | AFTER | INSTEAD OF } {INSERT [OR] | UPDATE [OR] | DELETE} [OF col_name] ON table_name [REFERENCING OLD AS o NEW AS n] [FOR EACH ROW] WHEN (condition) DECLARE Declaration-statements BEGIN Executable-statements EXCEPTION Exception-...
PLSQL_Oracle Trigger触发器的基本概念和用法 2014-06-14 Created By BaoXinjian 一、基本概念 触发器是许多关系数据库系统都提供的一项技术。在ORACLE系统里,触发器类似过程和函数,都有声明,执行和异常处理过程的PL/SQL块。 触发器在数据库里以独立的对象存储,它与存储过程和函数不同的是,存储过程...
create or replace TRIGGER TRG_NAME BEFORE INSERT ON original_table FOR EACH ROW BEGIN IF :NEW.opt_value = 'BT' THEN INSERT INTO new_values (id_values, yr_month) with tab123 (h_value, l_value, y_month) as (select :NEW.high_value, cast(:NEW.low_value as number) , to_char(trunc...
Note See also how to create AFTER DELETE, AFTER INSERT, AFTER UPDATE, BEFORE DELETE, and BEFORE UPDATE triggers. See also how to drop a trigger.Example Let's look at an example of how to create an BEFORE INSERT trigger using the CREATE TRIGGER statement. If you had a table created as...
The example above filters for Valid objects that have the word DeptRecord in the PL/SQL source.Other enhancements include:Indexes and constraints can now be renamed Triggers can now be created in the context of a table or view Folders added for Primary, Unique and Foreign key constraints for...