REF:https://stacktuts.com/how-to-check-if-cursor-exists-open-status-in-sql
for update ---2. 打开游标:使用Open语句打开Transaction-SQL服务器游标,执行Open语句的过程就是按照Select语句惊醒填充数据 ---打开游标以后游标位置在第一行 Open MyCursor ---3. 读取游标数据:在打开游标以后,使用Fetch语句从Transaction-SQL服务器游标中检索特定的一行,使用Fetch ---操作可以使游标移动到下一条...
Api-Servercursor (Application Programming Interface)API-Cursor unterstützen die API-Cursorfunktionen in OLE DB und ODBC. API-Servercursor werden auf dem Server implementiert. Jedes Mal, wenn eine Clientanwendung eine API-Cursorfunktion aufruft, überträgt der OLE DB-Anbieter des SQL Server Nati...
Integer value = 1005. Application has to see changed data for existing rows only. This option is the SQL Server-specific synonym for the JDBC TYPE_SCROLL_SENSITIVE and has the same concurrency setting behavior. Rows are retrieved from the server in blocks that are specified by the fetch size...
Applies to: SQL ServerThis article describes how to configure the cursor threshold server configuration option in SQL Server by using SQL Server Management Studio or Transact-SQL. The cursor threshold option specifies the number of rows in the cursor set at which cursor keysets are...
Defines the attributes of a Transact-SQL server cursor, such as its scrolling behavior and the query used to build the result set on which the cursor operates.
This is not directly important here, because you are not updating rows through the cursor, but SQL Server doesn't know that. It has to build a plan that collects, stores, and compares checksums. Side note: Much of the work done in the open and fetch execution plans is redundant because...
In SQL Server, if the cursor was created by setting a cursor variable to a cursor, cursor_name returns the name of the cursor variable. In previous releases, this output column returns a system-generated name. cursor_scope smallint 1 = LOCAL 2 = GLOBAL status smallint The s...
SELECT DISTINCT PRD_NO,CUS_NO,STD_LEVEL,USR FROM CUS_ML_GGEC HOLDLOCK WHERE PRD_NO+'*'+CUS_NO NOT IN (SELECT PRD_NO+'*'+CUS_NO FROM PRDT_AUTH ) OPEN MY_CURSOR FETCH NEXT FROM MY_CURSOR INTO@PRD_NO,@CUS_NO,@STD_LEVEL,@USR ...
游标(cursor)是系统为用户开设的一个数据缓冲区,存放SQL语句的执行结果。每个游标区都有一个名字,用户可以用SQL语句逐一从游标中获取记录,并赋给主变量,交由主语言进一步处理。 游标是处理结果集的一种机制吧,它可以定位到结果集中的某一行,多数据进行读写,也可以移动游标定位到你所需要的行中进行操作数据。一般...