triggers

问题 I have a table Table Schema: CREATE TABLE CHARGES ( total NUMBER(30), admitdate TIMESTAMP(6), dischargedate TIMESTAMP(30) ) Trigger Algorithm: if { dischargedate="null" then total=admitdate-sysdate=difference in days * Total Do this every day at 12:00(24 Hr. Format) } else { Do Nothing; } My question is what to do if the system is offline at 12:00 am. This problem will not allow the trigger to run. 回答1: To run a piece of code on a specific time, you can use jobs . Triggers are there only to

问题 This is throwing "Error: ORA-04082: NEW or OLD references not allowed in table level triggers" I'm not sure where I'm going wrong. The error number shouldn't make a difference should it? CREATE OR REPLACE TRIGGER REJECTION BEFORE INSERT OR UPDATE ON TEA_PREFS_T DECLARE temp NUMBER; BEGIN SELECT COUNT(*) INTO temp FROM tea_prefs_t WHERE person = :new.drinkerid; IF (temp >=10) THEN raise_application_error(-20101, 'ERROR: CANNOT INSERT MORE THAN 10'); ROLLBACK; END IF; END; 回答1: As the error

问题 What is the error in the following code. I am executing in mysql CREATE TRIGGER tg_order_insert BEFORE INSERT ON `order` FOR EACH ROW BEGIN INSERT INTO `grocery`.`order_seqid` VALUE(NULL); SET NEW.order_id = CONCAT('#GNC', LPAD(LAST_INSERT_ID(),3,'0')); END; Grocery is the database and order_seqid and order are 2 table. order_seqid is a table with only 1 attribute if type int and auto increment. Am trying to put a prefix on the id which we insert into order table. I am getting 2 errors in

问题 I would like to create a trigger that will delete a row when one of its attributes becomes negative. So far I have this, but it doesn't appear to be valid sql: CREATE OR REPLACE TRIGGER ZERO_COPIES_TRIGGER after update of counter_attribute on my_table referencing new as new for each row when(new.copies < 0) begin delete from my_table where my_table.id = :new.id; end; 回答1: This is not going to work. You can't perform DML on a table which is being manipulated by a row-level trigger. You will

问题 I have a simple mission is inserting huge MD5 values into tables (partitioned table), and have created a trigger and also a trigger function to instead of INSERT operation. And in function I checked the first two characters of NEW.md5 to determine which table should be inserted. DECLARE tb text; BEGIN IF TG_OP = 'INSERT' THEN tb = 'samples_' || left(NEW.md5, 2); EXECUTE(format('INSERT INTO %s VALUES (%s);', tb, NEW.*)); <- WRONG END IF; RETURN NULL; END; The question is how to concat the NEW.

问题 I am using phpmyadmin. I am using a trigger in mysql which calls a php script after inserting something in a table. My trigger contains this. DECLARE result INT; SET result=(select sys_exec('C:/xampp/php/php.exe C:/xampp/htdocs/mysite/hello.php')); But i got this error while trying to insert something to the table. #1305 FUNCTION db.sys_exec does not exists (my database name is db) Help me with this.Thanks. 回答1: sys_exec is not a standard mysql function. It's provided by an external UDF

问题 i'm trying to write a mySQL tigger but i can't put my code in phpMyAdmin MySQL without getting a syntax error. can someone help me please? Tables : My trigger : CREATE TRIGGER after_jeu_insert ON jeu AFTER INSERT AS BEGIN DECLARE @gameid int, @oldTurn int, @newTurn int SELECT @gameid=idpartie FROM INSERTED SELECT @oldturn=tour FROM partie WHERE idpartie=@gameid IF(@oldTurn IS NULL) { SET @newTurn = 1 } ELSE { IF(@oldTurn==1) SET @newTurn = 2 ELSE SET @newTurn = 1 } UPDATE partie SET tour =

问题 The baseline requirement is to create an order number in the format: (M)M-SSS Where MM represents the current month and SSSS represents the order sequence for that month. For example 1-002 would represent the second order submitted in January. Using a TRIGGER I'd like the auto-increment and insert to work transparently. Unfortunately, it has been a long time since I have touched a stored procedure and this is my first foray into postgresql. Any help pointing in the right direction would be

问题 I have a div 'slide' element within another div 'box' parent container and have applied JQuery Draggable to the child. While the item is being dragged, I'm resizing the parent container, sometimes shrinking, sometimes enlarging it. The problem is that JQuery doesn't respond to this resizing and still contains the dragged element within the original dimensions of the parent, rather than within its current size, until mouseup - the next drag session will use the new dimensions (until it changes

问题 I have this trigger : CREATE trigger [dbo].[DeriveTheAge] on [dbo].[Student] after insert,update as begin declare @sid as int; declare @sdate as date; select @sid= [Student ID] from inserted; select @sdate=[Date of Birth] from inserted; commit TRANSACTION if(@sdate is not null) begin update Student set Age=DATEDIFF(YEAR,@sdate,GETDATE()) where [Student ID]=@sid; end print 'Successfully Done' end as it suggests, the trigger automatically calculates the Derived attribute "Age" from the date of