SQL SERVER有返回值的存儲過程的使用

本文章使用Microsoft的Northwind數據庫，爲簡便本次只使用Products表。

一、書寫存儲過程[ProductPage]

CREATE PROCEDURE [dbo].[ProductPage]
	@PageIndex int,
	@PageSize  int,
	@ReturnCount int output
AS
BEGIN
	DECLARE @Start int, @End int
	
	SET @Start = (@PageIndex - 1) * @PageSize
	SET @End = @Start + @PageSize + 1
	
	CREATE TABLE #TEMP(
		[Index] int primary key not null identity(1,1),
		[ProductID] int,
		[ProductName] nvarchar(40),
		[SupplierID] int,
		[CategoryID] int,
		[QuantityPerUnit] nvarchar(20),
		[UnitPrice] money,
		[UnitsInStock] smallint,
		[UnitsOnOrder] smallint,
		[ReorderLevel] smallint,
		[Discontinued] bit)
	
	INSERT INTO #TEMP ([ProductID],[ProductName],[SupplierID],[CategoryID],[QuantityPerUnit],
	[UnitPrice],[UnitsInStock],[UnitsOnOrder],[ReorderLevel],[Discontinued])
	SELECT * FROM Products
	
	SET @ReturnCount = @@ROWCOUNT
	
	SELECT *, @ReturnCount as CO FROM #TEMP
	WHERE [Index] > @Start AND [Index] < @End
	
	RETURN @ReturnCount--((@ReturnCount / @PageSize) + 1)
END

二、使用

using (SqlConnection conn = new SqlConnection(webconnectstring)) 
{
    SqlCommand cmd = new SqlCommand();
    cmd.Connection = conn;
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.CommandText = "ProductPage";

    SqlParameter[] parms = new SqlParameter[]{
        new SqlParameter("@PageIndex", SqlDbType.Int),
        new SqlParameter("@PageSize", SqlDbType.Int),
        new SqlParameter("@ReturnCount", SqlDbType.Int),
        new SqlParameter("@ReturnValue",SqlDbType.Int)
    };
    parms[0].Value = pageIndex;
    parms[1].Value = pageSize;
    parms[2].Value = 0;
    parms[3].Direction = ParameterDirection.ReturnValue;

    foreach (SqlParameter parm in parms)
    {
        cmd.Parameters.Add(parm);
    }

    SqlDataAdapter sqlAdapter = new SqlDataAdapter(cmd);
    sqlAdapter.Fill(ds);

    recodeCount = Convert.ToInt32(parms[3].Value);

    if (ds != null && ds.Tables.Count > 0)
    {
        if (ds.Tables[0].Rows.Count <= 0)
        {
            ds = null;
        }
    }
    else
    {
        ds = null;
    }

    conn.Close();
    sqlAdapter.Dispose();
    cmd.Dispose();
    conn.Dispose();
}

如果存儲過程中沒有RETURN，那麼代碼中的recodeCount的值將會是0。