最后通过 WHILE 循环遍历 Cursor,打印出每个员工的信息。 Cursor For 的应用场景 Cursor For 在处理需要逐条记录进行相同操作的情况下非常实用。例如,在批量更新或删除数据时,我们可以使用 Cursor For 遍历数据集合,逐条执行相同的操作。 总结 通过本文的介绍,我们了解了 Cursor For 在 SQL Server 中的用法
在Case函数中,可以使用BETWEEN,LIKE,IS NULL,IN,EXISTS等等,通过在Case函数中嵌套Case函数,在合计函数中使用Case函数等方法,也可以在Check、触发器等中使用Case。 2、循环分支For和While 2.1For循环 for 变量 in 开始数值...结束数值 loop end loop; 1. 2.2While循环 只要表达式成立就执行循环语句 **while** 条...
DECLARE My_Cursor CURSOR --定义游标 FOR (SELECT * FROM dbo.MemberAccount) --查出需要的集合放到游标中 OPEN My_Cursor; --打开游标 FETCH NEXT FROM My_Cursor ; --读取第一行数据 WHILE @@FETCH_STATUS = 0 BEGIN --UPDATE dbo.MemberAccount SET UserName = UserName + 'A' WHERE CURRENT OF My_...
continue;endendprint@loopIndex 游标 declare@SNnvarchar(50)declare@Ithfloatdeclare@numintset@num=0declarecursorTempcursorforselectSN,Ithfrom[Test].[dbo].[QXIth]opencursorTempfetchnextfromcursorTempinto@SN,@Ithwhile @@FETCH_STATUS=0--这里计数会多一个,beginifexists(select1from[Test].[dbo].[奇芯]...
CLOSE My_Cursor; --关闭游标 DEALLOCATE My_Cursor; --释放游标 GO 上⾯的两个例⼦应该可以解决我们在SQL中使⽤循环的所有需求，如果不能满⾜，⾃⼰可以根据以上两个⽰例进⾏扩展，希望能帮各位解决⼀些类似的问题。2.使⽤for loop、while do 例如：DECLARE @index int SET @index=100 WHIL...
MS SQL SERVER 支持三种类型的游标：Transact_SQL 游标，API 服务器游标和客户游标。（1） Transact_SQL 游标 Transact_SQL 游标是由DECLARE CURSOR 语法定义、主要用在Transact_SQL 脚本、存储过程和触发器中。Transact_SQL 游标主要用在服务器上，由从客户端发送给服务器的Transact_SQL 语句或是批处理...
SQL Server Cursor Types The type of cursor created can be very important and should match the requirements. Cursors are typically refined and customized to be fit for purpose at the time they are created. They are tuned for performance and function using single or combinations of configuration op...
API cursor functions in OLE DB and ODBC. API server cursors are implemented on the server. Each time a client application calls an API cursor function, the SQL Server Native Client OLE DB provider or ODBC driver transmits the request to the server for action against the API server cursor. ...
API server cursors are implemented on the server. Each time a client application calls an API cursor function, the SQL Server Native Client OLE DB provider or ODBC driver transmits the request to the server for action against the API server cursor. Client cursors Client cursors are implemented ...
API server cursors are implemented on the server. Each time a client application calls an API cursor function, the SQL Server Native Client OLE DB provider or ODBC driver transmits the request to the server for action against the API server cursor. Client cursors Client cursors are implemented ...