In this article, we will explore how to use SQL Server scroll cursors to selectively pick a row from the cursor instead of looping through rows one by one. Solution ASQL Server cursoris T-SQL logic to loop through a finite number of rows which are determined by the query that is used ...
A SQL Server cursor is a set of T-SQL logic that loops over a predetermined number of rows one at a time. The purpose of the cursor may be to update one row at a time or perform an administrative process, such as SQL Server database backups, in a sequential manner. Development, DBA...
SQL Server provides the@@FETCHSTATUSfunction that returns the status of the last cursorFETCHstatement executed against the cursor;If@@FETCHSTATUSreturns 0, meaning theFETCHstatement was successful. You can use theWHILEstatement to fetch all rows from the cursor as shown in the following code: WHIL...
However, in order to get the adaptive buffering for the forward-only updatable result sets, the application has to explicitly call the setResponseBuffering method of the SQLServerStatement object by providing a String value "adaptive". For an example code, see Updating large data sample. Expand ...
游标是SQL的一个内存工作区,由系统或用户以变量的形式定义。游标的作用就是用于临时存储从数据库中提取的数据块。在某些情况下,需要把数据从存放在磁盘的表中调到计算机内存中进行处理,最后将处理结果显示出来或最终写回数据库。这样数据处理的速度才会提高,否则频繁的磁盘数据交换会降低效率。
However, in order to get the adaptive buffering for the forward-only updatable result sets, the application has to explicitly call the setResponseBuffering method of the SQLServerStatement object by providing a String value "adaptive". For an example code, see Updating large data sample. Expand ...
Selecting Rows in a Result Set Server-Side Cursors and the SQLSRV Driver Client-Side Cursors and the SQLSRV Driver See Also Download PHP driver The SQLSRV driver lets you create a result set with rows that you can access in any order, depending on the cursor type. This topic will discuss...
Close Cursor下面是一个Sample：Sql代码Setserveroutputon;Declare---define cursor type nametype cur_...
SQL%ISOPEN 布尔型 DML执行过程中为真,结束后为假 3) 隐式Cursor是系统自动打开和关闭Cursor. Set Serveroutput on; begin update t_contract_master set liability_state = 1 where policy_code = '123456789'; if SQL%Found then dbms_output.put_line('the Policy is updated successfully.'); ...
SQL%ISOPEN 布尔型 DML执行过程中为真,结束后为假 3) 隐式Cursor是系统自动打开和关闭Cursor. Set Serveroutput on; begin update t_contract_master set liability_state = 1 where policy_code = '123456789'; if SQL%Found then dbms_output.put_line('the Policy is updated successfully.'); ...