触发器可以在表上的特定事件(例如INSERT、UPDATE、DELETE)发生时执行一些操作。 执行一个更新操作,以触发触发器的执行。可以使用UPDATE语句来更新表中的任意一行,即使不实际更改任何数据。 例如,假设有一个名为users的表,其中包含一个名为trigger_example的触发器。你可以执行以下命令来手动调用触发器: 例如,假设有...
CREATE TRIGGER example_trigger AFTER INSERT ON company FOR EACH ROW EXECUTE PROCEDURE auditlogfunc(); 当插入表company后执行触发器,将company的id和当前时间插入audit表中。 插入数据 INSERT INTO company (id,name,age,address,salary) VALUES (1, 'Paul', 32, 'California', 20000.00 ); 插入数据使触发...
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-hand...
wecheck=#CREATETRIGGERexample_trigger AFTERINSERTORUPDATEONCOMPANYFOREACH ROWEXECUTEPROCEDUREauditlogfunc(); wecheck=#CREATETRIGGERexample_trigger BEFOREDELETEONCOMPANYFOREACH ROWEXECUTEPROCEDUREauditlogfunc1(); auditlogfunc() 是 PostgreSQL 一个程序,其定义如下: CREATEORREPLACEFUNCTIONauditlogfunc()RETURNSTRI...
trigger_stmt:触发器的程序体,可以是一条SQL语句或者是用BEGIN和END包含的多条语句 所以可以说MySQL创建以下六种触发器: BEFORE INSERT,BEFORE DELETE,BEFORE UPDATE AFTER INSERT,AFTER DELETE,AFTER UPDATE 1. 2. 3. 4. 5. 6. 7. 8. 9. 基本语法 ...
5.最后,数据表创建好后,执行CREATE TRIGGER语句即可在表中创建一个触发器; CREATE TRIGGER example_trigger AFTER INSERT ON prefer FOR EACH ROW EXECUTE PROCEDURE auditlogfunc();复制代码 相关命令扩展: 1)列出表中的所有触发器 SELECT * FROM pg_trigger;复制代码 2)删除表中的指定触发器 #删除prefer表中的...
在Oracle中有一个触发器创建语句,如下所示: create or replace TRIGGER action2md AFTER INSERT OR UPDATE OR DELETE ON action DECLARE Mutating_table EXCEPTION; PRAGMA EXCEP 浏览3提问于2016-05-09得票数 2 回答已采纳 1回答 postgres>在另一个架构中创建触发器 我使用postgres 9.5,并以postgres用户的身份...
const triggerName = 'friend_created' const triggerFnName = 'on_friend_created' const eventType = 'insert' const schema_name = 'app' const table_name = 'friends' await sql` create or replace trigger ${sql(triggerName)} after ${sql.unsafe(eventType)} on ${sql.unsafe(`${schema_name}...
If you need to insert multiple rows at the same time it's also much faster to do it with a singleinsert. Simply pass an array of objects tosql(). constusers=[{name:'Murray',age:68,garbage:'ignore'},{name:'Walter',age:80}]awaitsql`insert into users${sql(users,'name','age')}...
there are relational database features you need, then Hyperscale (Citus) might be a good fit. Examples of key relational database features you might want to retain are strong consistency (not that eventual consistency compromise), foreign keys for referential integrity, trigge...