写了一个测试用的存储过程
CREATE PROCEDURE test
(
@startTime datetime,
@aa int
)
as
begindeclare @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.
CREATE PROCEDURE test
(
@startTime datetime,
@aa int
)
as
begindeclare @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.
(
@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
(
@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
--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
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。"......
---
declare statement nvarchar(1000)//这样就OK
(
@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
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
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.
(
@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