A trigger represents a special type of PL/SQL block that you can tie to an event. When a trigger is executed by the Oracle database, it is said to "fire." The most commonly used types of triggers are Data Manipulation Language (DML) triggers that fire in response to INSERT, UPDATE,...
where Gatepass_No= @GatePass_No and status in ('W12','G12') and approve_date <= convert( DateTime,@End_Date + ' 23:59:59',120); end --Oracle 触发器 create or replace trigger TR_GP_DECLARATION_HEAD after insert on GP_DECLARATION_HEAD for each row /*** PURPOSE: 业务类型: REVIS...
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,存储过程与函数需要用户显示调用才执行,而触发器是由一个事件来启动运行。即触发器是当某个事件发生时...
Toad for Oracle 启动DBMS输出. Oracle SQL developer 和 SQL Plus 用Script启动:set serveroutput on size 5000; 见图:
構文およびセマンティクスの詳細は、『Oracle Database PL/SQL言語リファレンス』を参照してください。ALTER TRIGGER文を使用すると、データベース・トリガーを使用可能化、使用禁止化またはコンパイルできます。注意: この文を使用して既存のトリガーの宣言や定義は変更できません。トリガーを...
In this scenario, a trigger can be used instead to update or delete records in the child tables when the parent table is changed. Types of Triggers Two types of triggers are available for SQL Server: INSTEAD OF trigger: The INSTEAD OF trigger allows you to bypass INSERT, UPDATE, or DELE...
Error Conditions and Exceptions in the Trigger Body See Also: Oracle Database SQL Reference for information about trigger creation syntax Types of Triggers A trigger can be a stored PL/SQL or C procedure associated with a table, view, schema, or the database itself. Oracle Database XE auto...
ACTION_TYPEVARCHAR2(11)NOACTION 类型,当前 OceanBase 数据库仅支持 PL/SQL。 TRIGGER_BODYVARCHAR2(65536)NO触发器语句,当前 OceanBase 数据库包含的信息比 Oracle 更多。 CROSSEDITIONVARCHAR2(7)NO跨版本信息。目前暂不支持该字段 BEFORE_STATEMENTVARCHAR2(3)NO语句前,YES/NO。表示组合触发器是否包含指定类型的...
What is an Oracle trigger A trigger is a named PL/SQL block stored in the Oracle Database and executed automatically when a triggering event takes place. The event can be any of the following: A data manipulation language (DML) statement executed against a table e.g.,INSERT,UPDATE, orDELE...
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...