SQL Server存储过程在C#中调用的简单实现方法

create procedure pro_name_tableName
@param1 param1_type,
@param2 param2_type,
as
begin 
  --sql语句
end
go

CREATE TABLE [dbo].[szmBank](
 [Id] [bigint] IDENTITY(1,1) NOT NULL,
 [Balance] [decimal](18, 0) NOT NULL

#region
// ===============================================================================
// Project Name    :  
// Project Description : 
// ===============================================================================
// Class Name     :  SqlHelper
// Class Version    :  v1.0.0.0
// Class Description  :  SQL语句辅助类
// CLR         :  4.0.30319.18408 
// Author       :  shanzm
// Create Time     :  2018-8-14 18:22:59
// Update Time     :  2018-8-14 18:22:59
// ===============================================================================
// Copyright © SHANZM-PC 2018 . All rights reserved.
// ===============================================================================
#endregion

using System.Configuration;
using System.Data;
using System.Data.SqlClient;

namespace _16StoreProcedure
{
  public class SqlHelper
  {
    private static readonly string connStr =
      ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;

    /// <summary>
    /// 返回查询结果的的表
    /// </summary>
    /// <param name="sql">SQL语句或存储过程</param>
    /// <param name="type">执行类型</param>
    /// <param name="param">参数</param>
    /// <returns></returns>
    public static DataTable GetDataTable(string sql, CommandType type, params SqlParameter[] param)
    {
      using (SqlConnection conn = new SqlConnection(connStr))
      {
        using (SqlDataAdapter adapter = new SqlDataAdapter(sql, conn))
        {
          if (param != null)
          {
            adapter.SelectCommand.Parameters.AddRange(param);
          }

          adapter.SelectCommand.CommandType = type;
          DataTable da = new DataTable();
          adapter.Fill(da);
          return da;
        }
      }
    }


    /// <summary>
    /// 返回影响行数
    /// </summary>
    /// <param name="sql">SQL语句或存储过程</param>
    /// <param name="type">执行类型</param>
    /// <param name="param">参数</param>
    /// <returns></returns>
    public static int ExecuteNonquery(string sql, CommandType type, params SqlParameter[] param)
    {
      using (SqlConnection conn = new SqlConnection(connStr))
      {
        using (SqlCommand cmd = new SqlCommand(sql, conn))
        {
          if (param != null)
          {
            cmd.Parameters.AddRange(param);
          }
          cmd.CommandType = type;
          conn.Open();
          return cmd.ExecuteNonQuery();

        }
      }

    }

    /// <summary>
    /// 返回查询结果的第一行第一个单元格的数据
    /// </summary>
    /// <param name="sql">SQL语句或存储过程</param>
    /// <param name="type">执行类型</param>
    /// <param name="param">参数</param>
    /// <returns></returns>
    public static object ExecuteScalar(string sql, CommandType type, params SqlParameter[] param)
    {
      using (SqlConnection conn=new SqlConnection (connStr ))
      {
        using (SqlCommand cmd=new SqlCommand (sql,conn))
        {
          if (param !=null )
          {
            cmd.Parameters.AddRange(param);
          }
          cmd.CommandType = type ;
          conn.Open();
          return cmd.ExecuteScalar();
        }
      }
    }

  }
}

-- =============================================
-- Author: shanzm
-- Create date: 2020年5月2日 19:56:51
-- Description: 模拟账户之间转账
-- =============================================
create procedure pro_transfer_szmbank
@from bigint,
@to bigint,
@balance decimal(18,0),
@returnNum int output--(1表示转账成功，2表示失败，3表示余额不足)
as
begin
 --判断转出账户是否有足够的金额
 declare @money decimal(18,0)
 select @money=Balance from dbo.szmBank where Id=@from; 
 if @money-@balance>=0.1 
   --开始转账
  begin 
  begin transaction
   declare @sum int =0
   --转出账户扣钱
   update szmBank set balance=balance-@balance where id=@from
   set @sum=@sum+@@error
   --转入账户加钱
   update szmBank set balance=balance+@balance where id=@to
   set @sum=@sum+@@error
   --判断是否成功
   if @sum<>0
   begin
    set @returnNum=2--转账失败
    rollback
   end
   else
   begin
    set @returnNum=1--转账成功
    commit
   end
  end
 else
 begin
  set @returnNum=3--余额不足
 end
end
go

--执行测试：
declare @ret int
execute pro_transfer_szmbank 
@from='1',
@to='2',
@balance='10',
@returnNum=@ret output--注意输出参数在执行语句中也是要表明"output"
print @ret --结果是打印:1,即存储过程实现成功

static void Main(string[] args)
{
  //转出账户的Id
  int from = 1;
  //转入账户的Id
  int to = 2;
  //转账金额
  decimal balance = 10;

  SqlParameter[] param =
  {
    new SqlParameter ("@from",from),
    new SqlParameter("@to",to),
    new SqlParameter ("@balance",balance),
    //-------------------------------注意：这里设置为输出参数
    new SqlParameter ("@returnNum",System.Data.SqlDbType.Int{Direction=System.Data.ParameterDirection.Output }
  };

  //------------------------设置CommonType为StorProcedure类型
  SqlHelper.ExecuteNonquery("pro_transfer_szmbank",System.Data.CommandType.StoredProcedure, param);

  //------------------------获取输出参数
  //根据输出参数判断转账结果
  int outPutparam = Convert.ToInt16(param[3].Value);

  switch (outPutparam)
  {
    case 1: Console.WriteLine($"success:从Id:{from}转账{balance}元到Id：{to}");break;
    case 2: Console.WriteLine("error"); break;
    case 3: Console.WriteLine("余额不足"); break;
  }

  Console.ReadKey();
}

create procedure [dbo].[pro_ReturnDataTable]
as
begin
 select Id as 用户ID ,Balance as 余额 from szmBank;
end
go

execute pro_ReturnDataTable

static void Main(string[] args)
{
  DataTable dt = SqlHelper.GetDataTable("pro_ReturnDataTable", CommandType.StoredProcedure);
  foreach (DataRow row in dt.Rows)
  {
    Console.WriteLine(row["用户ID"].ToString() + ":" + row["余额"].ToString());
  }
  Console.ReadKey();
  //TransferAccounts();
  ReturnDataTable();
}