如有以下存储过程:
CREATE PROCEDURE t1
@tt int output
AS
set @tt=20
GO
我想在c#代码中写出@tt的值,代码如下: SqlConnection con = new SqlConnection("server=;database=nursinghomes;uid=sa;pwd=;");
SqlCommand cmd = new SqlCommand("t1",con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new SqlParameter("@tt",DbType.Int32));
cmd.Parameters["@tt"].Direction = ParameterDirection.Output;
con.Open();
cmd.ExecuteNonQuery();
Response.Write(cmd.Parameters["@tt"].Value.ToString());
但写出来的是空值,请问应该如果写??
CREATE PROCEDURE t1
@tt int output
AS
set @tt=20
GO
我想在c#代码中写出@tt的值,代码如下: SqlConnection con = new SqlConnection("server=;database=nursinghomes;uid=sa;pwd=;");
SqlCommand cmd = new SqlCommand("t1",con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new SqlParameter("@tt",DbType.Int32));
cmd.Parameters["@tt"].Direction = ParameterDirection.Output;
con.Open();
cmd.ExecuteNonQuery();
Response.Write(cmd.Parameters["@tt"].Value.ToString());
但写出来的是空值,请问应该如果写??
CREATE PROCEDURE t1
@tt int output
AS
set @tt=20
GO --------------------没输出嘛,怎么有返回值.
MSSQL中：
exec t1 @t output
OUTPUT 参数允许外部过程、批处理或多条 Transact-SQL 语句访问在过程执行期间设置的某个值。下面的示例创建一个存储过程 (titles_sum)，并使用一个可选的输入参数和一个输出参数。首先，创建过程：USE pubs
GO
IF EXISTS(SELECT name FROM sysobjects
WHERE name = 'titles_sum' AND type = 'P')
DROP PROCEDURE titles_sum
GO
USE pubs
GO
CREATE PROCEDURE titles_sum @@TITLE varchar(40) = '%', @@SUM money OUTPUT
AS
SELECT 'Title Name' = title
FROM titles
WHERE title LIKE @@TITLE
SELECT @@SUM = SUM(price)
FROM titles
WHERE title LIKE @@TITLE
GO接下来，将该 OUTPUT 参数用于控制流语言。 说明 OUTPUT 变量必须在创建表和使用该变量时都进行定义。
参数名和变量名不一定要匹配，不过数据类型和参数位置必须匹配（除非使用 @@SUM = variable 形式）。 DECLARE @@TOTALCOST money
EXECUTE titles_sum 'The%', @@TOTALCOST OUTPUT
IF @@TOTALCOST < 200
BEGIN
PRINT ' '
PRINT 'All of these titles can be purchased for less than $200.'
END
ELSE
SELECT 'The total cost of these titles is $'
+ RTRIM(CAST(@@TOTALCOST AS varchar(20)))下面是结果集：Title Name
------------------------------------------------------------------------
The Busy Executive's Database Guide
The Gourmet Microwave
The Psychology of Computer Cooking(3 row(s) affected)Warning, null value eliminated from aggregate.
All of these titles can be purchased for less than $200.
AS
set @tt=20
GOdeclare @tt as int
exec t1 @tt OUTPUT
print 'result =' + cast(@tt as varchar)drop procedure t1 /*
result =20
*/
存储过程:
CREATE PROCEDURE t1
@tt int output
AS
set @tt=@tt+1
GOc#代码:
SqlConnection con = new SqlConnection("server=;database=nursinghomes;uid=sa;pwd=;");
SqlCommand cmd = new SqlCommand("t1",con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new SqlParameter("@tt",20));
cmd.Parameters["@tt"].Direction = ParameterDirection.Output;
con.Open();
cmd.ExecuteNonQuery();
Response.Write(cmd.Parameters["@tt"].Value.ToString());
但还是写空值
我的目的是想在c#里调用存储过程里面的@tt的值,理论上response出来的应该是21吧,但还是写空值
cmd.Parameters.Add(new SqlParameter("@tt",20));
和這個
CREATE PROCEDURE t1
@tt int output
AS
set @tt=@tt+1
GO
仔細看看,你沒有輸入數值﹐肯定是空啊﹗建議存儲過程定義輸入參數﹕
CREATE PROCEDURE t1
@t int﹐ @tt int output
AS
set @tt=@t+1
GO
和
cmd.Parameters.Add(new SqlParameter("@t",20));
這樣試下
cmd.Parameters.Add(new SqlParameter("@tt",20));
是輸入.肯定沒數值.
cmd.Parameters["@tt"].Direction = ParameterDirection.Output;
这里已经设置了输出类型呀,理论上应该有输出的吧,我试试你的方法,谢谢
cmd.Parameters["@tt"].Direction = ParameterDirection.Output;
谢谢niming520
cmd.Parameters["@tt"].Direction = ParameterDirection.Output;
谢谢niming520
cmd.Parameters["@tt"].Direction = ParameterDirection.Output;
谢谢niming520
cmd.Parameters["@tt"].Direction = ParameterDirection.Output;
谢谢niming520
cmd.Parameters["@tt"].Direction = ParameterDirection.Output;
谢谢niming520
cmd.Parameters["@tt"].Direction = ParameterDirection.Output;
谢谢niming520
cmd.Parameters["@tt"].Direction = ParameterDirection.Output;
谢谢niming520
dmd.Parameters[0].Direction = ParameterDirection.Output;随手敲的,可能手误.
dmd.Parameters[0].Direction = ParameterDirection.Output;随手敲的,可能手误.
dmd.Parameters[0].Direction = ParameterDirection.Output;随手敲的,可能手误.
dmd.Parameters[0].Direction = ParameterDirection.Output;随手敲的,可能手误.
cmd.Parameters[0].Direction = ParameterDirection.Output;随手敲的,可能手误.
cmd.Parameters[0].Direction = ParameterDirection.Output;随手敲的,可能手误.
补充一问题,解决散分,下面那句出错在那里呀,说@tb必须声明,PS:@recordCount,@tb,@keyindex在存储过程中已经声明,是不是select count(*)不能带变量呀? set @recordCount=(select count(*) from @tb) order by @keyindex
-------------------------
---这个需要改为：declare @sql nvarchar(100)
declare @recordCount int
set @sql='select @count=count(*) from '+ @tb + ' order by '+@keyindex
exec sp_executesql @sql,N'@count int output',@recordCount output