Question

当我尝试在我的SQL语句中使用动态查询代码时

Declare @Start datetimeoffset;
Declare @End datetimeoffset;
Declare @SqlCommand nvarchar(Max);

Set @Start = '2013-05-17 10:00:04.500 +00:00';
Set @End = '2013-09-17 10:00:04.500 +00:00'
Set @SqlCommand = 'Select * from Test where TimeLine > '+ @Start+' AND TimeLine < '+@End

Exec(@SqlCommand)

我收到消息说

Msg 402，Level 16，State 1，Line 8
数据类型varchar和datetimeoffset在add运算符中不兼容。

请指导我正确使用。

Answer 1

您需要将DateTimeOffset值强制转换为varchars。此外，您缺少其他报价。

像

这样的东西

Declare @Start datetimeoffset = '2013-05-17 10:00:04.500 +00:00'
Declare @End datetimeoffset = '2013-09-17 10:00:04.500 +00:00'
Declare @SqlCommand nvarchar(Max)

Set @SqlCommand = 'Select * from Test where SampleTime > '''+ CAST(@Start AS VARCHAR(50))+''' AND SampleTime < '''+CAST(@End AS VARCHAR(50)) + ''''

SELECT @SqlCommand

SQL Fiddle DEMO

Answer 2

您应该添加''，如下所示，并将@Start / @End投射到varchar

Declare @Start datetimeoffset;
Declare @End datetimeoffset;
Declare @SqlCommand nvarchar(Max);

Set @Start = '2013-05-17 10:00:04.500 +00:00';
Set @End = '2013-09-17 10:00:04.500 +00:00'
Set @SqlCommand = 'Select * from Test where SampleTime > '''+ cast(@Start as varchar(100))+''' AND SampleTime < '''+cast(@End as varchar(100))+''' '

Exec(@SqlCommand)

数据类型varchar和datetimeoffset在add运算符中不兼容

2 个答案:

SQL Fiddle DEMO