在BEGIN和END之间的代码块是触发器的逻辑。 INSERT触发器 当在表中插入新的行时,INSERT触发器被激活。我们可以在INSERT触发器中编写逻辑代码来处理插入操作。下面是一个示例,展示如何在INSERT触发器中插入额外的数据。 CREATETRIGGERinsert_triggerONcustomersFORINSERTASBEGININSERTINTOcustomer_logs(customer_id,action)SEL...
SETANSI_NULLSONGOSETQUOTED_IDENTIFIERONGOcreattrigger[dbo].[T_CaregoryDelete]--触发器的名字为T_CaregoryDeleteon[dbo].[caregory]--是caregory类别表的触发器afterdelete--after代表执行删除后执行as后边的语句asbegindeletenewswherecaId=(selectidfromdeleted)--激发触发器后我要执行的动作,其中deleted是一个系统...
gocreate trigger tr_t_salon Tfor insert,updateasdeclare @title varchar(10),@salary moneyselect @title=T.title,@salary=T.salaryfrom T join inserted i on T.tno = i.inoif(@title='教授') and ((@salary<3000) or (@salary is null))beginupdate T set salary=3000where title='教授' and ...
Iterators: begin, cbegin, end, cend, rbegin, rend, crbegin, crend, items Capacity: empty, size, max_size Modifiers: clear, push_back, operator+=, emplace_back, emplace, erase, insert, update, swap Lexicographical comparison operators: operator==, operator!=, operator<, operator>, operator<...
Because an S-lock or Sch-M lock is held in the final phase of the index operation, be careful when you run an online index operation inside an explicit user transaction, such as BEGIN TRANSACTION ... COMMIT block. Doing this causes the lock to be held until the end of the transaction...
if (object_id('tgr_orders_insert', 'tr') is not null) drop trigger [tgr_orders_insert]; go create trigger [tgr_orders_insert] on [orders] after insert as if (select [status] from [goods],[inserted] where [goods].name=[inserted].name)=1 begin print 'the goods is being processed...
SqlCommand.BeginExecuteReader SqlCommand.BeginExecuteXmlReader 提示 在用于 SQL Server 的 Microsoft SqlClient 数据提供程序中,这些旧方法不再需要连接字符串中的 Asynchronous Processing=true。异步编程功能这些异步编程功能提供了一种简单的方法来实现代码异步。有...
Select the Microsoft Message Header Analyzer link to analyze the header fields and values in depth. Paste the message header into the Insert the message header you would like to analyze section (CTRL+V or right-click and choose Paste), and then select Analyze headers....
BEGIN; SET LOCAL enable_seqscan = off; SELECT ... COMMIT;Also, if the table is small, a table scan may be faster.Why isn’t a query using a parallel table scan?The planner doesn’t consider out-of-line storage in cost estimates, which can make a serial scan look cheaper. You can...
(builder); InsertFileStream(builder); Console.WriteLine("Done"); }privatestaticvoidReadFileStream(SqlConnectionStringBuilder connStringBuilder){using(SqlConnection connection =newSqlConnection(connStringBuilder.ToString())) { connection.Open(); SqlCommand command =newSqlCommand("SELECT TOP(1) Photo.PathName...