从字符串转换日期时间时 T-SQL 转换失败

Question

我正在使用以下存储过程，它将日期时间变量作为输入

ALTER PROCEDURE dbo.report @createfrom as datetime=null,@createto as datetime=null
AS
BEGIN
    declare @sql varchar(1000)
    declare @s datetime;
    declare @s1 datetime;

    --set @createfrom='7/7/2014 12:00:00 AM'(my input is like in this format)
    set @sql = N'select * from table1 where createdon >=''' + cast(@createfrom as datetime) + '''and createdon <=''' + cast(@createto as datetime) + ''' AND createdon is not null'

    exec(@sql) 
END

我不知道我做错了什么。 createdon 是表 1 中的 datetime 变量。我已经在代码本身中给出了输入参数格式。我想坚持cast 而不是convert

Answer 1

我知道你说过你想坚持使用转换，但最好在你的字符串中将日期格式化为 yyyymmdd

例如

ALTER PROCEDURE dbo.report @createfrom as datetime=null,@createto as datetime=null
AS
BEGIN
    declare @sql varchar(1000)
    declare @s datetime;
    declare @s1 datetime;

    --set @createfrom='7/7/2014 12:00:00 AM'(my input is like in this format)
    set @sql = N'select * from table1 where createdon >=''' + CONVERT(VARCHAR(8), @createfrom, 112) + '''and createdon <=''' + CONVERT(VARCHAR(8), @createto, 112) + ''' AND createdon is not null'

    exec(@sql) 
END