如何知道何时提交或回滚事务

Question

我正在尝试了解如何以及何时提交/回滚事务。我正在使用 IF 条件来测试代码是否产生错误，如果产生错误，我想回滚。

测试代码的最佳方法是什么，以便您知道何时提交或回滚。

我试过下面的代码，但我收到了这个错误

Msg 102, Level 15, State 1, Line 5 Incorrect syntax near '*'.

Begin Transaction DBChallenge1Setup
 Create Table EmployeeRecords(
                            EmployeeID varchar(50) PRIMARY KEY
                            PpsNo varchar(8),
                            FirstName varchar(50),
                            LastName varchar(50),
                            Department varchar(50),
                            SupervisorId varchar(50),
                            PhoneNo varchar(50),
                            EmailAddress varchar(50),
                            DateOfBirth date);
Insert Into EmployeeRecords
                    Values(1, '5686213Q', 'Dan', 'Roche', 'IT',232, '012323232', 'danroche@itsolutions.com', '1970-04-10'),
                            (2, '6534223Q', 'Nicholas', 'Martin', 'IT',233, '012323233', 'nicholasmartin@itsolutions.com', '1974-12-01'),
                            (232, '9514223W', 'Jane', 'Donnelly', 'IT',999, '012323234', 'janedonnelly@itsolutions.com', '1960-02-12'),
                            (233, '4212223S', 'Amy', 'Smythe', 'IT',999, '012323235', 'amysmythe@itsolutions.com', '1967-09-11');

Select * From EmployeeRecords
Select @@Rowcount As RecordsEntered, @@ERROR As Errors
if @@Error > 0 ROLLBACK Transaction DBChallenge1Setup
if @@Error = 0 Commit Transaction DBChallenge1Setup;

Answer 1

我推荐使用try/catch来处理意外错误；

begin try
Begin Transaction DBChallenge1Setup
 Create Table EmployeeRecords(
                            EmployeeID varchar(50,) PRIMARY KEY
                            PpsNo varchar(8),
                            FirstName varchar(50),
                            LastName varchar(50),
                            Department varchar(50),
                            SupervisorId varchar(50),
                            PhoneNo varchar(50),
                            EmailAddress varchar(50),
                            DateOfBirth date)
Insert Into EmployeeRecords
                    Values(1, '5686213Q', 'Dan', 'Roche', 'IT',232, '012323232', 'danroche@itsolutions.com', '1970-04-10'),
                            (2, '6534223Q', 'Nicholas', 'Martin', 'IT',233, '012323233', 'nicholasmartin@itsolutions.com', '1974-12-01'),
                            (232, '9514223W', 'Jane', 'Donnelly', 'IT',999, '012323234', 'janedonnelly@itsolutions.com', '1960-02-12'),
                            (233, '4212223S', 'Amy', 'Smythe', 'IT',999, '012323235', 'amysmythe@itsolutions.com', '1967-09-11');
Commit Transaction DBChallenge1Setup;
end try
begin catch
   ROLLBACK Transaction DBChallenge1Setup
end catch

您应该在 catch 块中回滚事务。此外，最好使用 ERROR_MESSAGE() ERROR_SEVERITY() 等

在 catch 块中记录发生的错误详细信息

如何知道何时提交或回滚事务

How to know when to Commit or Rollback a Transaction

sql

sql-server

transactions

commit

rollback