.Net 调用存储过程取到return的返回值_实用技巧

1. 存储过程

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author: <Author,,Name>
-- Create date: <Create Date,,>
-- Description: <Description,,>
-- =============================================
alter PROCEDURE GetOrderLine
@orderId varchar(50)
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON; 

select * from orderLine where OrderId = @orderId; 

return 123;
END
GO

 注意 存储过程只能返回 int 类型，如果返回一个字符串 ，将会报类型转化错误

2 后台调用

DataTable dt = new DataTable();
string connStr = System.Configuration.ConfigurationManager.ConnectionStrings["BLL.Properties.Settings.ShoppingDBConnectionString"].ToString();
using(SqlConnection conn= new SqlConnection(connStr)){
string callName = "GetOrderLine";
using (SqlCommand command = new SqlCommand(callName, conn))
{
command.CommandType = CommandType.StoredProcedure;
SqlParameter[] sps = { new SqlParameter("@orderId",SqlDbType.VarChar,50) ,
new SqlParameter("@return",SqlDbType.Int) //注册返回值类型
}; 

sps[0].Value = "43c7cf15-6b2f-4d18-92b2-dbe827f30dfc";
sps[1].Direction = ParameterDirection.ReturnValue; //返回参数类型 

command.Parameters.AddRange(sps);
using(SqlDataAdapter sda =new SqlDataAdapter()){
sda.SelectCommand = command;
sda.Fill(dt);
//Console.WriteLine(sda.GetFillParameters()[1].Value);
Console.WriteLine(sps[1].Value); //取到返回的值
} 

}
} 

if(dt.Rows.Count>0){
for (int i = 0; i < dt.Rows.Count;i++ )
{
Console.WriteLine(dt.Rows[i]["ProductId"]+":"+dt.Rows[i]["ProductPrice"]+":"+dt.Rows[i]["ProductCount"]);
}
}
Console.ReadLine();

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