--查找触发器的名称selectobject_namefromuser_objectswhereonject_type='TRIGGER';--得到名称后, 查找触发器的内容select*fromuser_sourcewherename='first_trg'orderbyline; (二)触发器的语法 1.DDL事件的触发器: create alter drop CREATE[OR REPLACE]TRIGGER--触发器的名称[BEFORE | AFTER | INTEAD OF][DDL...
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...
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-...
PL/SQL TriggersPL/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 ...
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...
1. Logging example In this example, after each update on ‘SALARY’ column ofemployee_salary, it will fire a ‘after update’ trigger and insert the new updated data into aemployee_salary_logtable, for audit purpose. 1.1 Create tables and trigger. ...
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); ...
Tutorial #9:PL SQL Package: Oracle PL/SQL Package Tutorial With Examples Tutorial #10:PL SQL Transactions – COMMIT, ROLLBACK And SAVEPOINT Tutorial #11:Triggers In PL SQL: Tutorial With Example Programs Tutorial #12:PL SQL Datetime Format: Date and Time Functions In PL/SQL ...
PL/SQL Developer is an Integrated Development Environment for developing, testing, debugging and optimizing Oracle PL/SQL stored program units like packages, triggers and so on. PL/SQL Developer features context sensitive help and database object descriptions, syntax highlighting, data querying and edi...
ORA-06512:at"SYSTEM.TRG_BEFORE_EMP_UPDATE", line15ORA-04088: error during executionoftrigger'SYSTEM.TRG_BEFORE_EMP_UPDATE'Copy 2. Update values ABEFORE UPDATEtrigger example to update:NEW.UPDATED_BYand:NEW.UPDATED_DATEautomatically. 2.1 Create a table. ...