How to create triggers and stored procedures in PostgreSQL?

5 months ago

1 minute

To create triggers and stored procedures in PostgreSQL, you need to use SQL statements. Below are the basic steps for creating triggers and stored procedures.

Create a stored procedure.

CREATE OR REPLACE FUNCTION my_function()
RETURNS VOID AS $$
BEGIN
   -- 写入存储过程的逻辑代码
   -- 可以包含SQL语句、流程控制语句等
END;
$$ LANGUAGE plpgsql;

Create a trigger:

CREATE TRIGGER my_trigger
AFTER INSERT ON my_table
FOR EACH ROW
EXECUTE FUNCTION my_function();

In the example above, we created a stored procedure named my_function and wrote the logic code for the stored procedure within it. Then, we created a trigger named my_trigger, which executes the my_function stored procedure when a row of data is inserted into the my_table table.

Please note that the above is just an example code. In actual applications, the logic code for stored procedures and triggers should be written based on specific requirements. When writing stored procedures and triggers, it is recommended to read the PostgreSQL official documentation for more detailed information and usage.