Sqlserver事务备份和还原的实例代码(必看)

 create database mydb use mydb go create table account( id varchar(16), name varchar(16), balance float ) go select * from account insert into account(id, name, balance) values('620101', 'liyong', 300) insert into account(id, name, balance) values('620106', 'mali', 400) --insert into account(id, name, balance) values('620009', 'chenying', 800) insert into account(id, name, balance) values('646009', 'chenying', 800) --delete from account where id = '620009' go update account set balance = balance - 1000 where id = '620101' update account set balance = balance + 1000 where id = '620106' --消息 547，级别 16，状态 0，第 1 行 --UPDATE 语句与 CHECK 约束"CK_Blance"冲突。该冲突发生于数据库"mydb"，表"dbo.account", column 'balance'。 --语句已终止。 go --alter table account --alter COlumn balance int go alter table account add constraint CK_Blance check(balance >= 0) go alter table account drop constraint CK_Blance --定一个事务 --从liyong扣钱往mali加钱 begin transaction update account set balance = balance - 1000 where id = '620101' if((select balance output from account where id = '620101') <0) begin PRINT('余额不足！'); ROLLBACK; end else begin update account set balance = balance + 1000 where id = '620106' commit; PRINT('转账成功！'); end go sp_help --备份设备 sp_addumpdevice 'disk', 'xk_bak' ,'d:\xk_bak' --备份数据库 backup database mydb to xk_bak --还原数据库 restore database mydb from disk = 'd:\xk_bak' with replace; --覆盖