postgresql 函数demo
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内容图文
create or replace function refresh_product_usage() returns void as $$
declare
rec record;
sub_rec record;
init_pro_id integer;
parent_product_id integer;
now_bom_id integer;
total_product_qty float;
cinsider_efficiency boolean:=true;
begin
TRUNCATE TABLE product_usage;
for rec in select id,bom_id,product_id,product_qty,product_efficiency from mrp_bom where bom_id is not null loop
now_bom_id:=rec.bom_id;
total_product_qty:= rec.product_qty;
if cinsider_efficiency then
total_product_qty = total_product_qty/rec.product_efficiency;
end if;
loop
for sub_rec in select product_id as parent_product_id from mrp_bom where id =now_bom_id loop
parent_product_id:=sub_rec.parent_product_id;
end loop;
if not exists(select id from mrp_bom where bom_id is not null and product_id = parent_product_id ) then --(no record)-->root bom
if exists(select id from product_usage where bom_id = now_bom_id and product_id = rec.product_id) then
update product_usage set product_qty = product_qty + total_product_qty where bom_id = now_bom_id and product_id = rec.product_id;
else
insert into product_usage(bom_id,product_id,product_qty) values(now_bom_id, rec.product_id, total_product_qty);
end if;
exit;
else
for sub_rec in select bom_id,product_qty,product_efficiency from mrp_bom where bom_id is not null and product_id = parent_product_id limit 1 loop
now_bom_id:=sub_rec.bom_id;
total_product_qty = total_product_qty* sub_rec.product_qty;
if cinsider_efficiency then
total_product_qty = total_product_qty/sub_rec.product_efficiency;
end if;
end loop;
end if;
end loop;
end loop;
end;
$$ LANGUAGE plpgsql;
实际上，本来打算只写一个sql代码块，也就是只要以下部分：
declare
rec record;
sub_rec record;
init_pro_id integer;
parent_product_id integer;
now_bom_id integer;
total_product_qty float;
cinsider_efficiency boolean:=true;
begin
TRUNCATE TABLE product_usage;
for rec in select id,bom_id,product_id,product_qty,product_efficiency from mrp_bom where bom_id is not null loop
now_bom_id:=rec.bom_id;
total_product_qty:= rec.product_qty;
if cinsider_efficiency then
total_product_qty = total_product_qty/rec.product_efficiency;
end if;
loop
for sub_rec in select product_id as parent_product_id from mrp_bom where id =now_bom_id loop
parent_product_id:=sub_rec.parent_product_id;
end loop;
if not exists(select id from mrp_bom where bom_id is not null and product_id = parent_product_id ) then --(no record)-->root bom
if exists(select id from product_usage where bom_id = now_bom_id and product_id = rec.product_id) then
update product_usage set product_qty = product_qty + total_product_qty where bom_id = now_bom_id and product_id = rec.product_id;
else
insert into product_usage(bom_id,product_id,product_qty) values(now_bom_id, rec.product_id, total_product_qty);
end if;
exit;
else
for sub_rec in select bom_id,product_qty,product_efficiency from mrp_bom where bom_id is not null and product_id = parent_product_id limit 1 loop
now_bom_id:=sub_rec.bom_id;
total_product_qty = total_product_qty* sub_rec.product_qty;
if cinsider_efficiency then
total_product_qty = total_product_qty/sub_rec.product_efficiency;
end if;
end loop;
end if;
end loop;
end loop;
end;
但奇怪的是会报很多莫名其妙的语法错误：
貌似无法识别很多诸如 record / open 之类的关键字。
郁闷之下写了个函数。
postgresql 用于sql debug输出可以用：raise notice ‘your_message;%s‘%your_message_var
然后游标的概念弱化了，与其用cursor，不如直接用 for rec in select .... loop .... end loop;
有点小遗憾没有找到从结果集里直接赋值的方法。
动态执行sql语句使用DO/EXECUTE
原文：http://www.cnblogs.com/Tommy-Yu/p/4061685.html
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