CREATE
OR REPLACE FUNCTION delete_fdr () RETURNS TRIGGER AS $delete_fdr$
BEGIN
DELETE
FROM
OBJECT_CLASSES$
WHERE
OBJECT_CLASSES$.DataRoom_ID = OLD .DATAROOM_ID ;
END ; $delete_fdr$ LANGUAGE plpgsql;
CREATE TRIGGER FDR_DELETE AFTER DELETE ON FEATURE_DATAROOM$ FOR EACH ROW EXECUTE PROCEDURE delete_fdr ();
CREATE TRIGGER 末尾不能直接掉用SQL 语句必须要函数, 逻辑也是很诡异, 不方便.
CREATE 的FUNCTION 返回值竟然是个TRIGGER 才行
$delete_fdr$ ..... $delete_fdr$ 这两个之间的为实际函数逻辑 ,随便你写什么,,不过最好用$$ 括起来
LANGUAGE 指定 函数用什么实现, 据说还能c,tcl其他一堆写法,
postgresql版本为9.6, postgis插件2.14