2. DROP TRIGGER example 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. SELECTTRIGGER_NAME,STATUSFROMUSER_TRIGGERSwhereupper(TR...
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...
--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...
PL/SQL Triggers - Learn about PL/SQL triggers, their types, and how to use them effectively in your database applications.
Specifies a PL/SQL program statement. The trigger body can contain nested blocks. condition Specifies an exception condition name, such as NO_DATA_FOUND. Example The following example shows a before row-level trigger that calculates the commission of every new employee belonging to department 30 be...
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 Triger Example CREATE OR REPLACE TRIGGER my_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); dbms_output.put(‘ New...
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. ...
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 ...
trigger-name 指定触发器的名称。此名称(包括隐式或显式的模式名)不能标识已在目录中描述的触发器 (SQLSTATE 42710)。如果指定了两部分的名称,那么模式名不能以“SYS”开头 (SQLSTATE 42939)。 BEFORE 指定在将主题表的实际更新所引起的任何更改应用于数据库之前执行相关联的触发操作。 AFTER 指定在将主题表的实...