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 $example_table$BEGININSERT INTO AUDIT(EMP_ID,ENTRY_DATE)VALUES(new.ID,cu...
shulanxtdb=#CREATETRIGGERexample_trigger AFTERINSERTONCOMPANYFOREACH ROWEXECUTEPROCEDUREauditlogfunc(); auditlogfunc() 是 PostgreSQL 一个程序,其定义如下: CREATEORREPLACEFUNCTIONauditlogfunc()RETURNSTRIGGERAS$example_table$BEGININSERTINTOAUDIT(EMP_ID, ENTRY_DATE)VALUES(new.ID,current_timestamp);RETURNNEW...
CREATETRIGGERexample_trigger AFTERINSERTONCOMPANYFOREACHROWEXECUTEPROCEDUREauditlogfunc(); SQL 执行结果如下所示- 向COMPANY表中插入一些数据记录,以验证触发器执行情况。 INSERTINTOCOMPANYVALUES(1,'小米科技',8,'北京市朝阳区',9999); INSERTINTOCOMPANYVALUES(2,'京东中科',6,'广州市天河区',8999); SQL 在...
CREATE TRIGGER语句用于在PostgreSQL表中创建一个新的触发器。 当表发生特定事件(即INSERT,UPDATE和DELETE)时,它被激活。 语法 CREATETRIGGER trigger_name[BEFORE|AFTER|INSTEAD OF]event_name ONtable_name [ -- Trigger logic goes here... ]; 1....
触发器定义如下,是表 t1 上的行级触发器,对 t1 进行 INSERT 之后会触发,并执行 insert_into_t2 函数,将插入到 t1 的数据也插入到 t2。 CREATETRIGGERafter_insert_into_t1AFTERINSERTONt1FOREACHROWEXECUTEFUNCTIONinsert_into_t2(); insert_into_t2 函数定义如下,其中引用了上下文信息 NEW,表示插入到 t1 的数...
Second, create a BEFORE INSERT trigger and associate a trigger function with it: CREATE TRIGGER trigger_name BEFORE INSERT ON table_name FOR EACH {ROW | STATEMENT} EXECUTE FUNCTION trigger_function(); PostgreSQL BEFORE INSERT trigger example First, create a table called inventory to store inventory...
testdb=# CREATE TRIGGER example_trigger AFTER INSERT ON COMPANY FOR EACH ROW EXECUTE PROCEDURE auditlogfunc(); 1. 2. 其中auditlogfunc()是PostgreSQL 过程并具有以下定义- CREATE OR REPLACE FUNCTION auditlogfunc() RETURNS TRIGGER AS $example_table$ ...
CREATE TRIGGER postgres=# create trigger tg4 after insert on digoal for each statement execute procedure debug(); CREATE TRIGGER -- 创建多个同类型的触发器 postgres=# create trigger tg01 before insert on digoal for each statement execute procedure debug(); CREATE TRIGGER postgres=# create trigger ...
empname; RETURN new; ELSEIF(TG_OP='INSERT') THEN INSERT INTO employee_audit select 'I',now(),user,new.empname; RETURN new; ENDIF; RETURN NULL; END; $$; 创建触发器 CREATE TRIGGER employee_trigger AFTER INSERT OR UPDATE OR DELETE ON employee FOR EACH ROW EXECUTE PROCEDURE process_...
After creating the trigger function, we can attach it to one or multiple triggering operations such as UPDATE, INSERT, and DELETE for the table. We do this by querying the CREATE TRIGGER command. Let's have a look at its syntax: