[英]Ado.net running SQL Server stored procedure can't retrieve output value when using ExecuteReader
[英]How to use output parameter and select query result of a sql server stored procedure in ado.net?
嗨,我想獲取輸出參數的值以及選擇查詢的結果集。
我使用了ExecuteNonQuery
,它為輸出參數提供了適當的值。
我使用ExecuteReader
它沒有為輸出參數提供適當的值,但它為選擇查詢提供了適當的值。
那么我應該用什么來獲得這兩個結果。
ALTER PROCEDURE [dbo].[XYZ]
(
@szUserName varchar(50),
@iOutDistinceBankCount int out
)
AS
BEGIN
declare @iCountDistinctBanks int;
set @iCountDistinctBanks = (select count (distinct a.DCC_BANK_ID )
from DEF a with(nolock)
join ABC b with(nolock) on
a.ROLEID = b.ROLEID
where b.USERNAME = @szUserName and b.STATUS_ID = 2)
if ((@iCountDistinctBanks > 1) or (@iCountDistinctBanks = 0))
begin
set @iOutDistinceBankCount = @iCountDistinctBanks
end
else
begin
set @iOutDistinceBankCount = 1;
select a.DCC_BANK_ID as DCC_BANK_ID
from DEF a with(nolock)
join ABC b with(nolock) on
a.ROLEID = b.ROLEID
where b.USERNAME = @szUserName and b.STATUS_ID = 2
end
END
這是我的 C# 代碼。
Int32 i32DistinctDCCBankCount = -1;
Int64 i64BankStaticID = -1;
InitDB();
m_command = new SqlCommand("DCC_spUIDCCBankIdAccordingUser", m_con);
m_command.Parameters.Add("@szUserName", System.Data.SqlDbType.VarChar, 50).Value = MerchantName;
SqlParameter output = new SqlParameter("@iOutDistinceBankCount", System.Data.SqlDbType.Int);
output.Direction = System.Data.ParameterDirection.Output;
m_command.Parameters.Add(output);
m_command.CommandType = System.Data.CommandType.StoredProcedure;
m_con.Open();
// m_reader = m_command.ExecuteReader();
m_command.ExecuteNonQuery();
i32DistinctDCCBankCount = Convert.ToInt32(m_command.Parameters["@iOutDistinceBankCount"].Value);
if (i32DistinctDCCBankCount == 0)
{
iDistinctDCCBankCount = 0;
return i32DistinctDCCBankCount;
}
else if (i32DistinctDCCBankCount > 1)
{
iDistinctDCCBankCount = i32DistinctDCCBankCount;
return -2;
}
else if (i32DistinctDCCBankCount == 1)
{
i64BankStaticID = Convert.ToInt64(m_reader["DCC_BANK_ID"]);
iDistinctDCCBankCount = i32DistinctDCCBankCount;
return i64BankStaticID;
}
iDistinctDCCBankCount = 0;
return 0;
可以使用Command.ExecuteReader (或ExecuteNonQuery,如果您沒有要處理的行集)直接執行相同的查詢,但是您還需要執行其他幾個步驟來處理返回的值。 attempting to capture the Return value or parameters.請記住,嘗試捕獲返回值或參數,您必須完成對所有行集的處理。 parameters.以下代碼顯示如何使用 ExecuteReader 和循環來處理行集,然后捕獲返回值和參數。 parameters (even a lot of them) can be handled far faster than even a single row of data returned by a SELECT .您會發現參數(甚至很多)的處理速度甚至比SELECT返回的單行數據要快得多。
這是例子
With cmd.Parameters
cn.Open()
dr = cmd.ExecuteReader(CommandBehavior.CloseConnection)
' Process rowset(s)
bolEOF = dr.Read
Do
Do While bolEOF = True
' Process rows
bolEOF = dr.Read()
Loop
Loop While dr.NextResult = True
cmd.Cancel()
// you need to close dataReader first
dr.Close()
Debug.WriteLine("@iOutDistinceBankCount:" & _
.Item("@iOutDistinceBankCount").Value.ToString)
End With
一種可能的方法是使用 ado 的NextRecordSet
而根本不使用輸出參數
if ((@iCountDistinctBanks > 1) or (@iCountDistinctBanks = 0))
begin
set @iOutDistinceBankCount = @iCountDistinctBanks
select @iOutDistinceBankCount as OutDistinceBankCount
select 0 where 0 = 1
end
else
begin
set @iOutDistinceBankCount = 1;
select @iOutDistinceBankCount as OutDistinceBankCount
select a.DCC_BANK_ID as DCC_BANK_ID
from DEF a with(nolock)
join ABC b with(nolock) on
a.ROLEID = b.ROLEID
where b.USERNAME = @szUserName and b.STATUS_ID = 2
end
END
在代碼中
獲取作為您的參數的第一個記錄集,然后rs = rs.NextRecordSet()
... 讀取您的行
性能:輸出參數 vs select
真的不是這里的考慮因素
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