一、準備工作:
1、首先我們創建測試數據庫:
create database demo
2、創建數據表和測試數據:(這裏注意外鍵控制)
use demo
CREATE TABLE student
(
stuid int NOT NULL PRIMARY KEY,
stuname varchar(50)
)
CREATE TABLE score
(
stuid int NOT NULL REFERENCES student(stuid),
score int
)
GO
INSERT INTO student VALUES (101,'zhangsan')
INSERT INTO student VALUES (102,'wangwu')
INSERT INTO student VALUES (103,'lishi')
INSERT INTO student VALUES (104,'maliu')
GO
CREATE TABLE student
(
stuid int NOT NULL PRIMARY KEY,
stuname varchar(50)
)
CREATE TABLE score
(
stuid int NOT NULL REFERENCES student(stuid),
score int
)
GO
INSERT INTO student VALUES (101,'zhangsan')
INSERT INTO student VALUES (102,'wangwu')
INSERT INTO student VALUES (103,'lishi')
INSERT INTO student VALUES (104,'maliu')
GO
二、各種用法及輸出結果:
1、語句1:
use demo
--Invoking a run-time error
SET XACT_ABORT OFF
BEGIN TRAN
INSERT INTO score VALUES (101,90)
INSERT INTO score VALUES (102,78)
INSERT INTO score VALUES (107,76) /* Foreign Key Error */
INSERT INTO score VALUES (103,81)
INSERT INTO score VALUES (104,65)
COMMIT TRAN
go
--Invoking a run-time error
SET XACT_ABORT OFF
BEGIN TRAN
INSERT INTO score VALUES (101,90)
INSERT INTO score VALUES (102,78)
INSERT INTO score VALUES (107,76) /* Foreign Key Error */
INSERT INTO score VALUES (103,81)
INSERT INTO score VALUES (104,65)
COMMIT TRAN
go
結果1:只回滾錯誤行,語句還繼續執行。
--select * from score
101 90
102 78
103 81
104 65
101 90
102 78
103 81
104 65
2、語句2:
use demo
--事務回滾
SET XACT_ABORT on
BEGIN TRAN
INSERT INTO score VALUES (101,90)
INSERT INTO score VALUES (102,78)
INSERT INTO score VALUES (107,76) /* Foreign Key Error */
INSERT INTO score VALUES (103,81)
INSERT INTO score VALUES (104,65)
COMMIT TRAN
go
--事務回滾
SET XACT_ABORT on
BEGIN TRAN
INSERT INTO score VALUES (101,90)
INSERT INTO score VALUES (102,78)
INSERT INTO score VALUES (107,76) /* Foreign Key Error */
INSERT INTO score VALUES (103,81)
INSERT INTO score VALUES (104,65)
COMMIT TRAN
go
結果2:事務終止並全部回滾,結果爲空。
--select * from score
3、語句3:
use demo
--事務在錯誤行終止,錯誤行回滾,錯誤行之前的不回滾
SET XACT_ABORT on
BEGIN
INSERT INTO score VALUES (101,90)
INSERT INTO score VALUES (102,78)
INSERT INTO score VALUES (107,76) /* Foreign Key Error */
INSERT INTO score VALUES (103,81)
INSERT INTO score VALUES (104,65)
END
go
--事務在錯誤行終止,錯誤行回滾,錯誤行之前的不回滾
SET XACT_ABORT on
BEGIN
INSERT INTO score VALUES (101,90)
INSERT INTO score VALUES (102,78)
INSERT INTO score VALUES (107,76) /* Foreign Key Error */
INSERT INTO score VALUES (103,81)
INSERT INTO score VALUES (104,65)
END
go
結果3:出現這種是因爲系統把每個insert語句都看成是單獨的事務,所以錯誤行以前的是不回滾的。
--select * from score
101 90
102 78
101 90
102 78