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;$example_table$ LANGUAGE plpgsql; 现在,我们开始往 COMPANY 表中插入数据: runoobd...
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...
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;...
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 ...
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...
- `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...
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 ...
Here, I describe what the return value of a PostgreSQL row level trigger function means and suggest a useful code simplification for such functions.
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 $example_table$ ...
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...