Datetime和sp_executesql

Question

这是我的T-SQL代码，我遇到datetime

的问题

OPEN @form_dates

FETCH NEXT FROM @form_dates INTO @cid, @regdate, @compdate

/* PRINT @regdate
PRINT @compdate
This is correctly having values in datetime. eg: Mar 28 2012  6:03PM
PRINT @courseno 
*/

WHILE @@FETCH_STATUS = 0 
BEGIN
SET @SQL = 
N'update tblname set cs' + CAST (@cid AS VARCHAR(10)) + '_begin = @rstring , cs' + CAST (@cid AS VARCHAR(10))+ '_end = @cstring where UserID = '+ CAST (@tempID AS VARCHAR(10))

DECLARE @ParmDefinition nvarchar(500)
SET @ParmDefinition = N'@rstring datetime, @cstring datetime'

EXECUTE sp_ExecuteSQL @SQL, @ParmDefinition, 
@rstring = @regdate, @cstring = @compdate

I have the values of @regdate and @compdate fetched from a cursor and are of the format 
    Jan  3 2012  2:30PM
    Mar 28 2012  6:03PM
but these values are not reflecting in procedure output where I get the output:
@regdate

感谢。^

Answer 1

这与数据类型，日期时间或游标无关。这只是 sloppy 不一致的变量命名。外面你打电话给他们：

@regstring
@compstring

你打电话给他们：

@rstring
@cstring

因此，尝试以某种方式保持一致：

SET @SQL = N'update tblname set cs' + CAST (@cid AS VARCHAR(10)) 
+ '_begin = @rstring , cs' + CAST (@cid AS VARCHAR(10))
+ '_end = @cstring where UserID = '+ CAST (@tempID AS VARCHAR(10))

DECLARE @ParamDefinition nvarchar(500)
SET @ParamDefinition = N'@rstring datetime, @cstring datetime'

EXECUTE sp_ExecuteSQL @SQL, @ParamDefinition, 
@rstring = @regdate, @cstring = @compdate
^^-------------------^^

修改

这对我来说很好用：

DECLARE @SQL NVARCHAR(MAX);
SET @SQL = N'SELECT _begin = @rstring , _end = @cstring;';

DECLARE @ParmDefinition nvarchar(500)
SET @ParmDefinition = N'@rstring datetime, @cstring datetime'

DECLARE @regdate DATETIME = GETDATE(), @compdate DATETIME = DATEADD(DAY, 1, GETDATE());

EXECUTE sp_ExecuteSQL @SQL, @ParmDefinition, 
@rstring = @regdate, @cstring = @compdate;

结果：

_begin                   _end
-----------------------  -----------------------
2012-06-13 10:28:47.657  2012-06-14 10:28:47.657

我没有看到输出仍然包含文字“@rstring”并且没有被参数正确替换的方法，除非您仍然有拼写或其他变量名称不一致。我怀疑这个查询还有什么比你向我们展示的更多。