SQL 服务器 - 光标错误

Question

我正在声明一个动态游标，因为基于数据的父子关系嵌套了存储过程，这些数据可以在多个级别上处理并且每天都在变化。存储过程适用于父调用，但是此过程对子数据的处理会导致一条消息，指出 "Cursor is not open." 此消息发生在 Fetch 上，在检查以确保游标已打开后立即出现。

DECLARE @OutCur CURSOR; 
DECLARE @curName as NVARCHAR(MAX);
...
SET @curName = LEFT(replace(replace(CONVERT (time, GETDATE()),':',''),'.',''),8);
SET @sqlCommand = 'SELECT a.myfields FROM mytable a;            
SET @sqlCommand = 'SET @cursor' + @curName + ' = CURSOR LOCAL FAST_FORWARD FOR ' + @sqlCommand + ' OPEN @cursor' + @curName + ';'

SET @curName = '@cursor' + @curName + ' cursor output';

EXEC sys.sp_executesql @sqlCommand,@curName,@OutCur output
IF CURSOR_STATUS('global','@OutCur')=-1
    OPEN @OutCur;
FETCH NEXT FROM @OutCur INTO @name,@type

提前感谢您的输入。

Answer 1

如果您取消注释 close+deallocate - 脚本工作正常：

GO

DECLARE @OutCur CURSOR; 
DECLARE @curName as NVARCHAR(MAX), @sqlCommand nvarchar(max), @name varchar(100), @type varchar(100)
declare @i int = 0

while @i < 5
begin

  SET @curName = LEFT(replace(replace(CONVERT (time, GETDATE()),':',''),'.',''),8);
  SET @sqlCommand = 'SELECT ''111'' as name, ''cc'' as type; '
  SET @sqlCommand = 'SET @cursor' + @curName + ' = CURSOR LOCAL FAST_FORWARD FOR ' + @sqlCommand + ' OPEN @cursor' + @curName + ';'

  SET @curName = '@cursor' + @curName + ' cursor output';

  EXEC sys.sp_executesql @sqlCommand,@curName,@OutCur output

  FETCH NEXT FROM @OutCur INTO @name,@type
  select @name, @type

  --close @OutCur
  --deallocate @OutCur

  set @i += 1
end
GO

SQL 服务器 - 光标错误

SQL Server - Cursor Error

sql

sql-server

cursor