PL/SQL触发器，用于在插入，更新，删除后按顺序将数据输入到日志表中 [英] PL/SQL trigger for after insert, update, delete that enters Data into Log Table with a Sequence
问题描述
我正在处理家庭作业问题.我的触发器遇到编译问题，无法理解如何创建引用序列和另一个表的触发器，并将这些值插入到我创建的日志表中. 我已经读到，在Table列条目上使用SERIAL not null可能会消除需要一个序列表和一个引用表，但我需要它才能完成我的作业.
I am working on a homework problem. I am running into compilation issues with my trigger and am having trouble understanding how to create a trigger that references a sequence and another table, and insert those values into a log table that I've created. I have read that using SERIAL not null on the Table column entry may eliminates the need for a sequence and referencing table, but I need that for my homework to work.
我需要一些帮助来弄清楚如何触发我的触发器.我的序列中的绑定变量:NEW以及从另一个表插入的idpay值都存在问题.我不确定我的声明是否正确以及BEGIN语句之后的前两个语句是否正确，因为第一行被标记为编译错误. 我认为此示例正在进行某些事情，并且我在IF语句中缺少NULL值条目，但不确定在我的编码中该放在哪里.
I need some help figuring out how to get my trigger to compile. It is having problems with my Bind Variables :NEW from the sequence, and also the idpay value inserted from another Table. I'm not sure if my declarations are correct and the first two statements after the BEGIN statement are correct as that 1st line was flagged as a compilation error. I think something is going on with this example and my lack of the NULL value entry there in the IF statement, but unsure where to put that part in my coding.
当然还有触发器的Oracle 11g参考文档，我已经看完了，但是您也可以自己检查一下.
这是设置问题: 1.使用捐赠数据库.该组织希望跟踪所有质押付款 活动.每次添加，更改或删除质押付款时，以下内容 信息应在单独的表中捕获:用户名，当前日期，操作 (插入，更新或删除)，以及付款记录的idpay值.
Here is the setup question: 1. Use the Donations database. The organization wants to track all pledge payment activity. Each time a pledge payment is added, changed, or removed, the following information should be captured in a separate table: username, current date, action taken (INSERT, UPDATE, or DELETE), and the idpay value for the payment record.
创建一个名为DD_PAYTRACK的表来保存此信息.包括主键列 由一个序列填充，并为该序列创建名为DD_PTRACK_SEQ的新序列 主键列.
Create a table named DD_PAYTRACK to hold this information. Include a primary key column to be populated by a sequence, and create new sequence named DD_PTRACK_SEQ for the primary key column.
创建一个触发器来记录请求的信息以跟踪承诺 付款活动，并针对idpay = 1470的所有操作类型测试触发器. 通过使用SELECT语句显示DD_PAYTRACK表中的记录.
Create a single trigger for recording the requested information to track pledge payment activity, and test the trigger for all action types for idpay=1470. Display the records from the DD_PAYTRACK table by using SELECT statement.
select * from dd_paytrack;
IDTRACK PTUSER PTDATE PTACTION PTPAYID
4 AAX5367E220 10-DEC-12 INSERT 1470
5 AAX5367E220 10-DEC-12 UPDATE 1470
6 AAX5367E220 10-DEC-12 DELETE 1470
这是我到目前为止所做的，即使添加了这些Insert，Update和Delete语句后，它仍然返回Empty表，但是由于下面的答案，我已经修复了建议的内容.
Here is what I've done so far, even after adding these Insert, Update, and Delete statements, it's still returning an Empty table, but because of the answer below I have fixed what was suggested.
* 我已修复它，编译触发器后，我不得不添加自己的Update，Insert和Delete语句.现在效果很好.谢谢Noel !!! *
*I fixed it, I had to add my own Update, Insert, and Delete statements after compiling the Trigger. Works great now. Thanks Noel!!!*
DROP TABLE dd_paytrack;
DROP SEQUENCE idtrack_seq;
CREATE TABLE dd_paytrack(
idtrack NUMBER,
pt_user VARCHAR2(30),
pt_date DATE,
pt_action VARCHAR2(30),
pt_payid NUMBER(6,0),
CONSTRAINT pk_dd_paytrack PRIMARY KEY (idtrack)
);
CREATE SEQUENCE idtrack_seq;
CREATE OR REPLACE TRIGGER pledge_pay_trigger
AFTER
INSERT OR
UPDATE OR
DELETE
ON dd_payment
FOR EACH ROW
DECLARE
log_action dd_paytrack.pt_action%TYPE;
id_pay dd_paytrack.pt_payid%TYPE;
BEGIN
id_pay := :NEW.idpay;
IF INSERTING THEN
log_action := 'Insert';
ELSIF UPDATING THEN
log_action := 'Update';
ELSIF DELETING THEN
id_pay := :OLD.idpay;
log_action := 'Delete';
ELSE
DBMS_OUTPUT.PUT_LINE('This code is not reachable.');
END IF;
INSERT INTO dd_paytrack (idtrack, pt_user, pt_date, pt_action, pt_payid)
VALUES(idtrack_seq.NEXTVAL, USER, TO_CHAR(SYSDATE, 'DD-MON-YY'), log_action,
id_pay);
END pledge_pay_trigger;
/
INSERT INTO dd_payment(idpay, idpledge, payamt, paydate, paymethod)
VALUES (1470, 105, 250, SYSDATE, 'CC');
commit;
UPDATE dd_payment
SET payamt = 25
WHERE idpay = 1470;
commit;
UPDATE dd_payment
SET payamt = 2000
WHERE idpay = 1470;
COMMIT;
DELETE
FROM dd_payment
WHERE idpay = 1470;
COMMIT;
SET serveroutput ON
select * from dd_paytrack;
以下是捐赠表计划"，它针对我的家庭作业问题引用了dd_paytrack表.我对其进行了测试，并且在剪切和粘贴之后，该架构似乎可以正常工作.
Here is the Donation Table Scheme which it references the dd_paytrack Table for my Homework problem. I tested it and this schema seems to work okay after cutting and pasting it.
-- The DoGood Donor Database
-- A donor, who represents a person or company that has committed to make a donation to
the DoGood organzation.
DROP TABLE dd_donor CASCADE CONSTRAINTS;
DROP TABLE dd_project CASCADE CONSTRAINTS;
DROP TABLE dd_status CASCADE CONSTRAINTS;
DROP TABLE dd_pledge CASCADE CONSTRAINTS;
DROP TABLE dd_payment CASCADE CONSTRAINTS;
CREATE TABLE DD_Donor (
idDonor number(4),
Firstname varchar2(15),
Lastname varchar2(30),
Typecode CHAR(1),
Street varchar2(40),
City varchar2(20),
State char(2),
Zip varchar2(9),
Phone varchar2(10),
Fax varchar2(10),
Email varchar2(25),
News char(1),
dtentered date DEFAULT SYSDATE,
CONSTRAINT donor_id_pk PRIMARY KEY(idDonor) );
CREATE TABLE DD_Project (
idProj number(6),
Projname varchar2(60),
Projstartdate DATE,
Projenddate DATE,
Projfundgoal number(12,2),
ProjCoord varchar2(20),
CONSTRAINT project_id_pk PRIMARY KEY(idProj),
CONSTRAINT project_name_uk UNIQUE (Projname) );
CREATE TABLE DD_Status (
idStatus number(2),
Statusdesc varchar2(15),
CONSTRAINT status_id_pk PRIMARY KEY(idStatus) );
CREATE TABLE DD_Pledge (
idPledge number(5),
idDonor number(4),
Pledgedate DATE,
Pledgeamt number(8,2),
idProj number(5),
idStatus number(2),
Writeoff number(8,2),
paymonths number(3),
Campaign number(4),
Firstpledge char(1),
CONSTRAINT pledge_id_pk PRIMARY KEY(idPledge),
CONSTRAINT pledge_idDonor_fk FOREIGN KEY (idDonor)
REFERENCES dd_donor (idDonor),
CONSTRAINT pledge_idProj_fk FOREIGN KEY (idProj)
REFERENCES dd_project (idProj),
CONSTRAINT pledge_idStatus_fk FOREIGN KEY (idStatus)
REFERENCES dd_status (idStatus));
CREATE TABLE DD_Payment (
idPay number(6),
idPledge number(5),
Payamt number(8,2),
Paydate DATE,
Paymethod char(2),
CONSTRAINT payment_id_pk PRIMARY KEY(idPay),
CONSTRAINT pay_idpledge_fk FOREIGN KEY (idPledge)
REFERENCES dd_pledge (idPledge) );
INSERT INTO dd_donor
VALUES (301, 'Mary', 'Treanor', 'I','243 main St.', 'Norfolk',
'VA','23510',NULL,NULL,'mtrea492@mdv.com','Y','01-SEP-2012');
INSERT INTO dd_donor
VALUES (302, 'Patrick', 'Lee', 'I','11 Hooper St.', 'Norfolk',
'VA','23510','7572115445',NULL,'pleeNorf@gmail.com','N','09-SEP-2012');
INSERT INTO dd_donor
VALUES (303, 'Terry', 'Venor', 'I','556 Loop Lane.', 'Chesapeake',
'VA','23320',NULL,NULL,'tervenr@drw.edu','Y','18-SEP-2012');
INSERT INTO dd_donor
VALUES (304, 'Sherry', 'Pane', 'I','Center Blvd.', 'Virginia Beach',
'VA','23455',NULL,NULL,'toppane@yahoo.com','Y','21-SEP-2012');
INSERT INTO dd_donor
VALUES (305, 'Thomas', 'Sheer', 'I','66 Train St.', 'Chesapeake',
'VA','23322','7579390022',NULL,'tls3488@sheer.com','Y','01-MAR-2013');
INSERT INTO dd_donor
VALUES (306, NULL, 'Coastal Developers', 'B','3667 Shore Dr.', 'Virginia Beach',
'VA','23450','8889220004',NULL,'coastVA@cdev.com','Y','30-SEP-2012');
INSERT INTO dd_donor
VALUES (307, NULL, 'VA Community Org', 'G','689 Bush Dr.', 'Norfolk',
'VA','23513','7578337467','7578337468','vacmorg@biz.com','Y','03-OCT-2012');
INSERT INTO dd_donor
VALUES (308, 'Betty', 'Konklin', 'I','11 Shark Ln.', 'Virginia Beach',
'VA','23455','7574550087',NULL,'shark11@cox.net','N','04-OCT-2012');
INSERT INTO dd_donor
VALUES (309, 'Jim', 'Tapp', 'I','200 Pine Tree Blvd.', 'Chesapeake',
'VA','23320','',NULL,'','N','08-OCT-2012');
INSERT INTO dd_donor
VALUES (310, NULL, 'Unique Dezigns', 'B','Connect Circle Unit 12', 'Chesapeake',
'VA','23320','7574442121',NULL,'UDezigns@cox.net','Y','11-SEP-2012');
INSERT INTO dd_project
VALUES (500,'Elders Assistance League', '01-SEP-2012','31-OCT-2012',15000,'Shawn
Hasee');
INSERT INTO dd_project
VALUES (501,'Community food pantry #21 freezer equipment', '01-OCT-2012','31-DEC-
2012',65000,'Shawn Hasee');
INSERT INTO dd_project
VALUES (502,'Lang Scholarship Fund', '01-JAN-2013','01-NOV-2013',100000,'Traci
Brown');
INSERT INTO dd_project
VALUES (503,'Animal shelter Vet Connect Program', '01-DEC-2012','30-MAR-
2013',25000,'Traci Brown');
INSERT INTO dd_project
VALUES (504,'Shelter Share Project 2013', '01-FEB-2013','31-JUL-2013',35000,'Traci
Brown');
INSERT INTO dd_status
VALUES (10,'Open');
INSERT INTO dd_status
VALUES (20,'Complete');
INSERT INTO dd_status
VALUES (30,'Overdue');
INSERT INTO dd_status
VALUES (40,'Closed');
INSERT INTO dd_status
VALUES (50,'Hold');
INSERT INTO dd_pledge
VALUES (100,303,'18-SEP-2012',80,500,20,NULL,0,738,'Y');
INSERT INTO dd_pledge
VALUES (101,304,'21-SEP-2012',35,500,20,NULL,0,738,'Y');
INSERT INTO dd_pledge
VALUES (102,310,'01-OCT-2012',500,501,20,NULL,0,749,'Y');
INSERT INTO dd_pledge
VALUES (103,307,'03-OCT-2012',2000,501,20,NULL,0,749,'N');
INSERT INTO dd_pledge
VALUES (104,308,'04-OCT-2012',240,501,10,NULL,12,749,'Y');
INSERT INTO dd_pledge
VALUES (105,309,'08-OCT-2012',120,501,10,NULL,12,749,'Y');
INSERT INTO dd_pledge
VALUES (106,301,'12-OCT-2012',75,500,20,NULL,0,738,'N');
INSERT INTO dd_pledge
VALUES (107,302,'15-OCT-2012',1200,501,10,NULL,24,749,'Y');
INSERT INTO dd_pledge
VALUES (108,308,'20-JAN-2013',480,503,10,NULL,24,790,'N');
INSERT INTO dd_pledge
VALUES (109,301,'01-FEB-2013',360,503,10,NULL,12,790,'N');
INSERT INTO dd_pledge
VALUES (110,303,'01-MAR-2013',300,504,10,NULL,12,756,'N');
INSERT INTO dd_pledge
VALUES (111,306,'01-MAR-2013',1500,504,20,NULL,0,756,'Y');
INSERT INTO dd_pledge
VALUES (112,309,'16-MAR-2013',240,504,10,NULL,12,756,'N');
INSERT INTO dd_payment
VALUES (1425,100,80,'18-SEP-2012','CC');
INSERT INTO dd_payment
VALUES (1426,101,35,'21-SEP-2012','DC');
INSERT INTO dd_payment
VALUES (1427,102,500,'01-OCT-2012','CH');
INSERT INTO dd_payment
VALUES (1428,103,2000,'03-OCT-2012','CH');
INSERT INTO dd_payment
VALUES (1429,106,75,'12-OCT-2012','CC');
INSERT INTO dd_payment
VALUES (1430,104,20,'01-NOV-2012','CC');
INSERT INTO dd_payment
VALUES (1431,105,10,'01-NOV-2012','CC');
INSERT INTO dd_payment
VALUES (1432,107,50,'01-NOV-2012','CC');
INSERT INTO dd_payment
VALUES (1433,104,20,'01-DEC-2012','CC');
INSERT INTO dd_payment
VALUES (1434,105,10,'01-DEC-2012','CC');
INSERT INTO dd_payment
VALUES (1435,107,50,'01-DEC-2012','CC');
INSERT INTO dd_payment
VALUES (1436,104,20,'01-JAN-2013','CC');
INSERT INTO dd_payment
VALUES (1437,105,10,'01-JAN-2013','CC');
INSERT INTO dd_payment
VALUES (1438,107,50,'01-JAN-2013','CC');
INSERT INTO dd_payment
VALUES (1439,104,20,'01-FEB-2013','CC');
INSERT INTO dd_payment
VALUES (1440,105,10,'01-FEB-2013','CC');
INSERT INTO dd_payment
VALUES (1441,107,50,'01-FEB-2013','CC');
INSERT INTO dd_payment
VALUES (1442,108,20,'01-FEB-2013','CC');
INSERT INTO dd_payment
VALUES (1443,109,30,'01-FEB-2013','CC');
INSERT INTO dd_payment
VALUES (1444,104,20,'01-MAR-2013','CC');
INSERT INTO dd_payment
VALUES (1445,105,10,'01-MAR-2013','CC');
INSERT INTO dd_payment
VALUES (1446,107,50,'01-MAR-2013','CC');
INSERT INTO dd_payment
VALUES (1447,108,20,'01-MAR-2013','CC');
INSERT INTO dd_payment
VALUES (1448,109,30,'01-MAR-2013','CC');
INSERT INTO dd_payment
VALUES (1449,110,25,'01-MAR-2013','CC');
INSERT INTO dd_payment
VALUES (1450,111,1500,'01-MAR-2013','CH');
INSERT INTO dd_payment
VALUES (1451,104,20,'01-APR-2013','CC');
INSERT INTO dd_payment
VALUES (1452,105,10,'01-APR-2013','CC');
INSERT INTO dd_payment
VALUES (1453,107,50,'01-APR-2013','CC');
INSERT INTO dd_payment
VALUES (1454,108,20,'01-APR-2013','CC');
INSERT INTO dd_payment
VALUES (1455,109,30,'01-APR-2013','CC');
INSERT INTO dd_payment
VALUES (1456,110,25,'01-APR-2013','CC');
INSERT INTO dd_payment
VALUES (1457,112,20,'01-APR-2013','CC');
INSERT INTO dd_payment
VALUES (1458,104,20,'01-MAY-2013','CC');
INSERT INTO dd_payment
VALUES (1459,105,10,'01-MAY-2013','CC');
INSERT INTO dd_payment
VALUES (1460,107,50,'01-MAY-2013','CC');
INSERT INTO dd_payment
VALUES (1461,108,20,'01-MAY-2013','CC');
INSERT INTO dd_payment
VALUES (1462,109,30,'01-MAY-2013','CC');
INSERT INTO dd_payment
VALUES (1463,110,25,'01-MAY-2013','CC');
INSERT INTO dd_payment
VALUES (1464,112,20,'01-MAY-2013','CC');
COMMIT;
推荐答案
由于您在insert语句中使用了序列值，
Since you are using the sequence value in the insert statement,
INSERT INTO dd_paytrack
(idtrack, pt_user, pt_date,
pt_action, pt_payid
)
VALUES (idtrack_seq.NEXTVAL, USER, TO_CHAR (SYSDATE, 'DD-MON-YY'),
log_action, id_pay
);
无需选择以下内容.
SELECT idtrack_seq.NEXTVAL
INTO :NEW.idtrack
FROM DUAL;
此外，您在此行中未输入冒号，
Also, you have missed a colon in this line,
id_pay := :OLD.idpay;
还有一件事，触发器中没有DBMS_OUTPUT语句是没有意义的.因为您看不到它，即使执行成功也是如此.
One more thing, there is no point in having DBMS_OUTPUT statement in the trigger. Since you wont see it, even if the execution reaches it.
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