auditlogfunc() 是 PostgreSQL 一个程序,其定义如下: CREATE OR REPLACE FUNCTION auditlogfunc()RETURNS TRIGGER AS $example_table$BEGININSERT INTO AUDIT(EMP_ID,ENTRY_DATE)VALUES(new.ID,current_timestamp);RETURN NEW;END;$exam
使用raise notice TG_NAME跟踪调用顺序 : // 表举例 // 创建测试表 postgres=# create table digoal (id int); CREATE TABLE // 创建触发器函数 postgres=# create or replace function debug() returns trigger as $$ declare begin raise notice '%', TG_NAME; return new; end; $$ language plpgsql;...
A trigger function must return either NULL or a record/row value having exactly the structure of the table the trigger was fired for. Row-level triggers fired BEFORE can return null to signal the trigger manager to skip the rest of theoperation for this row (i.e., subsequent triggers are...
第一步:创建用户自定义函数 CREATE or Replace FUNCTION func_ug_updateTime() RETURNS trigger AS $func_ug_updateTime$ BEGIN If (TG_OP = 'UPDATE') THEN If NEW.uptime = OLD.uptime Then return null; END IF; END IF; update ug set uptime = NOW() where uid = NEW.uid and gid = NEW.gid...
Additionally, it does not have any RETURN statement like a regular trigger function. Second, create an event trigger using the CREATE EVENT TRIGGER statement: CREATE EVENT TRIGGER trigger_name ON event EXECUTE FUNCTION event_trigger_function_name() PostgreSQL event trigger example First, create a ...
- `EXECUTE FUNCTION function_name(arguments)`:触发器调用的函数及其参数。函数是触发器实际执行的代码。 具体的例子可能如下: ```sql CREATE TRIGGER example_trigger AFTER INSERT OR UPDATE ON example_table FOR EACH ROW EXECUTE FUNCTION example_function(); ``` 这个触发器在`example_table`表上的每次INSE...
runoobdb=# CREATE TRIGGER example_trigger AFTER INSERT ON COMPANY FOR EACH ROW EXECUTE PROCEDURE auditlogfunc(); auditlogfunc() 是 PostgreSQL 一个程序,其定义如下: CREATE OR REPLACE FUNCTION auditlogfunc() RETURNS TRIGGER AS $example_table$ BEGIN INSERT INTO AUDIT(EMP_ID, ENTRY_DATE) VALUES ...
CREATEORREPLACE FUNCTION auditlogfunc()RETURNS TRIGGERAS$example_table$ BEGIN INSERTINTOAUDIT(EMP_ID,ENTRY_DATE)VALUES(new.ID,current_timestamp); RETURN NEW; END; $example_table$ LANGUAGE plpgsql; 1. 2. 3. 4. 5. 6. SQL 执行结果如下所示- ...
The trigger function gets the information about its calling event through TriggerData, which contains some set of local variables. For example, the words “OLD” and “NEW” refer to the status of the row. The OLD keyword refers to the status of the row, i.e. proj_status in this case...
Example an auditing row level trigger Simplification of the row level trigger function Conclusion In this article, I'll talk about row level triggers, which are the most frequently used kind of triggers. I will describe what the return value of the trigger function means and suggest a useful...