共享锁+行锁防止其他事务对指定行同时更新

 

1、HOLDLOCK

其他事务可以读取，但不能更新删除

BEGIN TRAN
SELECT * FROM ceb_Area WITH(ROWLOCK,HOLDLOCK) where ID=1--行锁

SELECT * FROM ceb_Area WITH(TABLOCK,HOLDLOCK) where ID=1--表锁

WAITFOR DELAY '00:00:10'
COMMIT TRAN;  

 

2、TABLOCKX

其他事务不能读取表,更新和删除

BEGIN TRAN
SELECT COUNT(0) FROM ceb_P_Loan WITH(TABLOCKX) WHERE DATEDIFF(d,CreateTime,'2013-12-2')=0
WAITFOR DELAY '00:00:10'
COMMIT TRAN;