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...
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;...
1、创建function CREATE OR REPLACE FUNCTION auditlogfunc() RETURNS TRIGGER AS $example_table$ BEGIN INSERT INTO AUDIT(EMP_ID, ENTRY_DATE) VALUES (new.ID, current_timestamp); RETURN NEW; END; $example_table$ LANGUAGE plpgsql; 2、创建测试表 CREATE TABLE COMPANY( ID INT PRIMARY KEY NOT NULL,...
4、创建触发器: CREATE TRIGGER "example_trigger"AFTER INSERT ON A FOR EACH ROW EXECUTE PROCEDURE insert_table(); 【AFTER 关键字决定是在关联行的插入之后执行触发器动作】 【FOR EACH ROW 在一次操作表的语句中,每操作成功一行就会触发一次;不写的 话,表示是表级触发器,则无论操作多少行,都只触发一次】...
postgresql create trigger 在PostgreSQL中,`CREATE TRIGGER`语句用于创建触发器。触发器是与表相关联的一种特殊类型的存储过程,它会在表上执行指定的操作(例如INSERT、UPDATE、DELETE)时触发。以下是`CREATE TRIGGER`语句的一般形式以及其参数的说明: ```sql CREATE TRIGGER trigger_name {BEFORE | AFTER | INSTEAD ...
CREATE TRIGGER example_trigger AFTER INSERT ON COMPANY FOR EACH ROW EXECUTE PROCEDURE auditlogfunc(); 1. 2. 其中存储过程auditlogfunc如下: CREATE OR REPLACE FUNCTION auditlogfunc() RETURNS TRIGGER AS $example_table$ BEGIN INSERT INTO AUDIT(EMP_ID, ENTRY_DATE) VALUES (new.ID, current_timestamp...
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 $example_table$ ...
在这个例子中,我们将创建一个名为set_id_trigger的触发器。 代码语言:sql 复制 CREATE OR REPLACE FUNCTION set_id_trigger() RETURNS TRIGGER AS $$ BEGIN NEW.id = nextval('id_seq'); RETURN NEW; END; $$ LANGUAGE plpgsql; CREATE TRIGGER set_id_trigger BEFORE INSERT ON example_table FOR EAC...
Example: Let’s consider an example where we want to create a trigger named “update_salary_trigger” that automatically updates the “total_salary” column in the “employees” table whenever an update operation is performed on the “salary” column....
CREATE TRIGGER tg AFTER DELETE or INSERT or UPDATE ON test FOR EACH ROW EXECUTE PROCEDURE dml_trace(); 测试插入, 删除, 更新操作是否被跟踪. (已更新dml_trace, 以下例子未包含client_addr和client_port) postgres=# insert into test values (1, 'digoal', now()); INSERT 0 1 postgres=# select...