通过本文主要向大家介绍了net return,return on net assets,vb.net return,net smelter return,存储过程 return等相关知识,希望对您有所帮助,也希望大家支持linkedu.com www.linkedu.com
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</div>
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();
</div>
</div>