存储过程里怎么实现字符串SQL和日期类型参数的相连

[lyf_1688]

写了一个测试用的存储过程
CREATE PROCEDURE test
(
@startTime datetime,
@aa int
)
as
begin

declare @SQL varchar(1000)


set @SQL='select * from Customer where ApplyTime>='
if @aa<>0
begin
set @SQL=@SQL+@startTime
end

exec sp_executesql @SQL

END
return


哪位大G帮我看看是咋回事呀.老说字符串转日期类型出错.明明@startTime就是日期类型呀.

[-狙击手-]

CREATE PROCEDURE test
(
@startTime datetime,
@aa int
)
as
begin

declare @SQL varchar(1000)


set @SQL='select * from Customer where ApplyTime> ='
if @aa <> 0
begin
set @SQL=@SQL+''''+cast(@startTime as varchar) + ''''
end

exec sp_executesql @SQL

END
return

[中国风]

CREATE   PROCEDURE   test   
( 
@startTime   datetime, 
@aa   int 
) 
as 
begin 

declare   @SQL   varchar(1000) 


  set   @SQL='select   *   from   Customer   where   ApplyTime> =' 
  if   @aa <> 0 
begin 
set   @SQL=@SQL+''''+@startTime+''''	----加引号
end 

  exec   sp_executesql     @SQL 

    END     
    return 

[中国风]

--改
Declare @SaleNumSum int
exec('Select ['+ @SaleNumSum +'] = sum(SaleNum) from [200608] where StoreID = 24')

--如何将exec执行结果放入变量中？ 

declare @num int, 
               @sqls nvarchar(4000) 
set @sqls='select @a=count(*) from tableName ' 
exec sp_executesql @sqls,N'@a int output',@num output 
select @num 


--------------------------------------------------------------------------------

动态sql语句基本语法 
1 :普通SQL语句可以用Exec执行 

eg:   Select * from tableName 
         Exec('select * from tableName') 
         Exec sp_executesql N'select * from tableName'    -- 请注意字符串前一定要加N 

2:字段名，表名，数据库名之类作为变量时，必须用动态SQL 

eg:   
declare @fname varchar(20) 
set @fname = 'FiledName' 
Select @fname from tableName              -- 错误,不会提示错误，但结果为固定值FiledName,并非所要。 
Exec('select ' + @fname + ' from tableName')     -- 请注意 加号前后的 单引号的边上加空格 

当然将字符串改成变量的形式也可 
declare @fname varchar(20) 
set @fname = 'FiledName' --设置字段名 

declare @s varchar(1000) 
set @s = 'select ' + @fname + ' from tableName' 
Exec(@s)                -- 成功 
exec sp_executesql @s   -- 此句会报错 



declare @s Nvarchar(1000)  -- 注意此处改为nvarchar(1000) 
set @s = 'select ' + @fname + ' from tableName' 
Exec(@s)                -- 成功     
exec sp_executesql @s   -- 此句正确 

3. 输出参数 
declare @num int, 
        @sqls nvarchar(4000) 
set @sqls='select count(*) from tableName' 
exec(@sqls) 
--如何将exec执行结果放入变量中？ 

declare @num int, 
               @sqls nvarchar(4000) 
set @sqls='select @a=count(*) from tableName ' 
exec sp_executesql @sqls,N'@a int output',@num output 
select @num 

[lyf_1688]

以上两位大G.你们提示的方法我之前都用过.全部都报错.一个报跟我同样的错.一个报"过程需要参数 '@statement' 为 'ntext/nchar/nvarchar' 类型。"......

[wangxuelid]

学习，，

[wangxuelid]

@statement' 为 'ntext/nchar/nvarchar' 类型。"...
---
declare statement nvarchar(1000)//这样就OK

[fa_ge]

alter    PROCEDURE   #test   
( 
@startTime   datetime, 
@aa   int 
) 
as 
begin 

declare   @SQL   varchar(1000) 


  set   @SQL='select   *   from   pubs..employee   where   hire_date>=' 
  if   @aa <> 0 
begin 
set   @SQL=@SQL+convert(varchar(10),@startTime ,120)
exec (@SQL) 
end 
end

[hui_hui_2007]

我的代码已经测试过了:

--创建
create   proc ghtest   
	@starttime datetime, 
	@aa int 
as 
declare @sql varchar(1000) 
set @sql='select * from employee where hire_date >= ' 
if @aa <> 0 
begin 
	set @sql=@sql+''''+convert(varchar(10),@starttime ,120)+''''
	print @sql
	exec (@sql) 
end 

--调用
declare @t datetime
set @t=getdate()
exec ghtest @T,2

[hui_hui_2007]

1.你的参数是日期型,你传的实参也必须是日期型.
2.存贮过程中,必须将日期型参数转成字符串型才能与sql语句相连接.

[ws_hgo]

CREATE   PROCEDURE   test   
( 
@startTime   datetime, 
@aa   int 
) 
as 
begin 
declare   @SQL   varchar(1000) 
  set   @SQL='select   *   from   Customer   where   ApplyTime> =' 
  if   @aa <> 0 
begin 
set   @SQL=@SQL+''''+@startTime+''''    ----加引号
end 
  exec   sp_executesql     @SQL 
    END     
    return