Question

我正在尝试将Firebird SQL触发器代码转换为PG中的触发器/函数。

关于以下内容，我在';'上遇到语法错误在“END;”，我认为我正确地改变了其余部分，但无法弄清楚语法错误。

CREATE OR REPLACE FUNCTION purchase_q_ai0()
  RETURNS void as $$

    declare
    CB_QUANTITY integer;
    CB_QUANTITYONHAND integer;
    CB_BOT_ID keys;
    CB_ID keys;
    BOT_QUANTITY integer;
    BOT_QUANTITYONHAND integer;
    BOT_ID keys;
    TEMP_QUANTITY integer;

BEGIN
    /* Update cellarbook and bottle after INSERT
    quantitypurchase, quantityonhand, purchasevalueonhand and
    currentvalueonhand will be updated */
    if (new.quantity is Null) then
        TEMP_QUANTITY := 0;
    else
        TEMP_QUANTITY := new.quantity;

    /* get corresponding cellarbook info */
    select cellarbook.quantitypurchased, cellarbook.quantityonhand, cellarbook.fk_bottle_id, cellarbook.id
            from cellarbook
            where new.fk_cellarbook_id = cellarbook.id
            into cb_quantity, cb_quantityonhand, cb_bot_id, cb_id;

    if (CB_QUANTITY is null) then
        CB_QUANTITY := 0;
    if (CB_QUANTITYONHAND is null) then
        CB_QUANTITYONHAND := 0;

    /* get corresponding bottle info */
    select bottle.quantitypurchased, bottle.quantityonhand, bottle.id from bottle
           where bottle.id = cb_bot_id
           into bot_quantity, bot_quantityonhand, bot_id;

    if (BOT_QUANTITY is null) then
        BOT_QUANTITY := 0;
    if (BOT_QUANTITYONHAND is null) then
        BOT_QUANTITYONHAND := 0;

    /* update with new info */
    update cellarbook set cellarbook.quantitypurchased = (cb_quantity + temp_quantity),
                          cellarbook.quantityonhand = (cb_quantityonhand + temp_quantity),
                          cellarbook.purchasevalueonhand = (cellarbook.lastpurchaseprice * cellarbook.quantityonhand),
                          cellarbook.currentvalueonhand = (cellarbook.currentvalue * cellarbook.quantityonhand)
            where cellarbook.id = cb_id;
    update bottle set bottle.quantitypurchased = (bot_quantity + temp_quantity),
                      bottle.quantityonhand = (bot_quantityonhand + temp_quantity),
                      bottle.purchasevalueonhand = (bottle.lastpurchaseprice * bottle.quantityonhand),
                      bottle.currentvalueonhand = (bottle.currentvalue * bottle.quantityonhand)
           where bottle.id = bot_id;
END;
$$
LANGUAGE plpgsql;

Answer 1

plpgsql语言中的触发器函数总是需要返回trigger，并且它还需要一个正确的return语句。否则，您需要END IF IF个SELECT INTO语句并重新构建CREATE OR REPLACE FUNCTION purchase_q_ai0() RETURNS trigger AS $$ DECLARE CB_QUANTITY integer; CB_QUANTITYONHAND integer; CB_BOT_ID keys; CB_ID keys; BOT_QUANTITY integer; BOT_QUANTITYONHAND integer; BOT_ID keys; TEMP_QUANTITY integer; BEGIN /* Update cellarbook and bottle after INSERT quantitypurchase, quantityonhand, purchasevalueonhand and currentvalueonhand will be updated */ IF (NEW.quantity IS NULL) then TEMP_QUANTITY := 0; ELSE TEMP_QUANTITY := NEW.quantity; END IF; /* get corresponding cellarbook info */ SELECT cb.quantitypurchased, cb.quantityonhand, cb.fk_bottle_id, cb.id INTO cb_quantity, cb_quantityonhand, cb_bot_id, cb_id FROM cellarbook cb WHERE NEW.fk_cellarbook_id = cb.id; IF (CB_QUANTITY IS NULL) THEN CB_QUANTITY := 0; END IF; IF (CB_QUANTITYONHAND IS NULL) THEN CB_QUANTITYONHAND := 0; END IF; /* get corresponding bottle info */ SELECT b.quantitypurchased, b.quantityonhand, b.id INTO bot_quantity, bot_quantityonhand, bot_id FROM bottle b WHERE b.id = cb_bot_id; IF (BOT_QUANTITY IS NULL) THEN BOT_QUANTITY := 0; END IF; IF (BOT_QUANTITYONHAND IS NULL) THEN BOT_QUANTITYONHAND := 0; END IF; /* update with new info */ UPDATE cellarbook SET quantitypurchased = cb_quantity + temp_quantity, quantityonhand = cb_quantityonhand + temp_quantity, purchasevalueonhand = lastpurchaseprice * quantityonhand, currentvalueonhand = currentvalue * quantityonhand WHERE id = cb_id; UPDATE bottle SET quantitypurchased = bot_quantity + temp_quantity, quantityonhand = bot_quantityonhand + temp_quantity, purchasevalueonhand = lastpurchaseprice * quantityonhand, currentvalueonhand = currentvalue * quantityonhand WHERE id = bot_id; RETURN NEW; END; $$ LANGUAGE plpgsql;语句：

keys

我留给你来修复内部声明的变量的情况（在PostgreSQL中建议使用小写）。

顺便提一下，PostgreSQL默认不知道PRIMARY KEY数据类型。除非您定义该数据类型，否则代码将无法工作。这可能是Firebird特有的东西，用作integer吗？在这种情况下，它很可能是一个32位整数，你可以在PostgreSQL中使用{{1}}数据类型。

Answer 2

您需要在以下区域正确使用END IF

if (new.quantity is Null) then
    TEMP_QUANTITY := 0;
else
    TEMP_QUANTITY := new.quantity;
End if;

if (CB_QUANTITY is null) then
   CB_QUANTITY := 0;
if (CB_QUANTITYONHAND is null) then
   CB_QUANTITYONHAND := 0;
End if;
End if;

if (BOT_QUANTITY is null) then
    BOT_QUANTITY := 0;
if (BOT_QUANTITYONHAND is null) then
    BOT_QUANTITYONHAND := 0;
End if;
End if;

PLPGSQL-CONDITIONALS

将Firebird SQL触发器转换为PG触发器/功能

2 个答案: