Oracle 在插入、删除或更新时触发
尝试创建一个在表以任何方式更新后运行的 Oracle 触发器。我整个早上都在谷歌上搜索这个问题并想出了这个:
CREATE OR REPLACE TRIGGER gb_qty_change
AFTER UPDATE OR INSERT OR DELETE ON F_ITEM_STORE
FOR EACH ROW
DECLARE
v_qty V_AD_ON_HAND%rowtype;
v_isbn TD_ITEM_DESCRIPTION.TD_IDENTIFIER%type;
BEGIN
delete from gb_transaction where gb_tide = :new.ITST_ITEM_TIDE_CODE;
select TD_IDENTIFIER INTO v_isbn from TD_ITEM_DESCRIPTION where TD_TIDE = :new.ITST_ITEM_TIDE_CODE;
select * INTO v_qty from V_AD_ON_HAND where ITST_ITEM_TIDE_CODE = :new.ITST_ITEM_TIDE_CODE;
insert into gb_transaction(gb_tide, gb_isbn, gb_used_on_hand, gb_new_on_hand)
values(:new.ITST_ITEM_TIDE_CODE, v_isbn, v_qty.USED_ON_HAND, v_qty.NEW_ON_HAND);
END;
/
我试图将其保留为新表中每个 TIDE_CODE 的单个记录。
V_AD_ON_HAND 是一个提取库存计数的视图。 gb_transaction 是我的新表,我在其中记录这些事件将
其与其他人的代码进行比较,它看起来应该运行,但我收到“警告:使用编译错误创建的触发器”。
Trying to create an Oracle trigger that runs after a table is updated in any way. I've been googling this all morning and came up with this:
CREATE OR REPLACE TRIGGER gb_qty_change
AFTER UPDATE OR INSERT OR DELETE ON F_ITEM_STORE
FOR EACH ROW
DECLARE
v_qty V_AD_ON_HAND%rowtype;
v_isbn TD_ITEM_DESCRIPTION.TD_IDENTIFIER%type;
BEGIN
delete from gb_transaction where gb_tide = :new.ITST_ITEM_TIDE_CODE;
select TD_IDENTIFIER INTO v_isbn from TD_ITEM_DESCRIPTION where TD_TIDE = :new.ITST_ITEM_TIDE_CODE;
select * INTO v_qty from V_AD_ON_HAND where ITST_ITEM_TIDE_CODE = :new.ITST_ITEM_TIDE_CODE;
insert into gb_transaction(gb_tide, gb_isbn, gb_used_on_hand, gb_new_on_hand)
values(:new.ITST_ITEM_TIDE_CODE, v_isbn, v_qty.USED_ON_HAND, v_qty.NEW_ON_HAND);
END;
/
I'm trying to keep it to a single record per TIDE_CODE in the new table.
V_AD_ON_HAND is a view that pulls an inventory count.
gb_transaction is my new table where I'm logging these events
Comparing it to other peoples code it looks like it should run but I'm getting "Warning: Trigger created with compilation errors."
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我认为问题在于删除触发器的 :new 指定。毕竟,当记录被删除时,就没有 NEW 值了。您只能在删除时访问 :OLD 值。
如果按操作对触发器进行分段,则可以执行此操作。
顺便说一句,如果您告诉我们错误是什么,而不仅仅是您遇到了错误,通常会很有帮助。如果通过 SQL*Plus 脚本编译,则在正斜杠调用编译后的“end;”之后触发语句中,添加一行:
SHOW ERRORS TRIGGER YOUR_TRIGGER_NAME;
The problem, I believe is with the :new designations for a delete trigger. There is, after all, no NEW value as the record is expunged. You can only access the :OLD values on delete.
if you section the trigger by operation, you can do this.
Incidentally, it is generally helpfull if you tell us WHAT the error is, not just that you had one. If compiling via SQL*Plus script, after the forward slash call to compile the trigger after the "end;" statement, add a line that says:
SHOW ERRORS TRIGGER YOUR_TRIGGER_NAME;