create procedure pro_name_tableName
@param1 param1_type,
@param2 param2_type,
as
begin 
  --sql語(yǔ)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語(yǔ)句輔助類(lèi)
// 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>
    /// 返回查詢(xún)結(jié)果的的表
    /// </summary>
    /// <param name="sql">SQL語(yǔ)句或存儲(chǔ)過(guò)程</param>
    /// <param name="type">執(zhí)行類(lèi)型</param>
    /// <param name="param">參數(shù)</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>
    /// 返回影響行數(shù)
    /// </summary>
    /// <param name="sql">SQL語(yǔ)句或存儲(chǔ)過(guò)程</param>
    /// <param name="type">執(zhí)行類(lèi)型</param>
    /// <param name="param">參數(shù)</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>
    /// 返回查詢(xún)結(jié)果的第一行第一個(gè)單元格的數(shù)據(jù)
    /// </summary>
    /// <param name="sql">SQL語(yǔ)句或存儲(chǔ)過(guò)程</param>
    /// <param name="type">執(zhí)行類(lèi)型</param>
    /// <param name="param">參數(shù)</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: 模擬賬戶(hù)之間轉(zhuǎn)賬
-- =============================================
create procedure pro_transfer_szmbank
@from bigint,
@to bigint,
@balance decimal(18,0),
@returnNum int output--(1表示轉(zhuǎn)賬成功，2表示失敗，3表示余額不足)
as
begin
 --判斷轉(zhuǎn)出賬戶(hù)是否有足夠的金額
 declare @money decimal(18,0)
 select @money=Balance from dbo.szmBank where Id=@from; 
 if @money-@balance>=0.1 
   --開(kāi)始轉(zhuǎn)賬
  begin 
  begin transaction
   declare @sum int =0
   --轉(zhuǎn)出賬戶(hù)扣錢(qián)
   update szmBank set balance=balance-@balance where id=@from
   set @sum=@sum+@@error
   --轉(zhuǎn)入賬戶(hù)加錢(qián)
   update szmBank set balance=balance+@balance where id=@to
   set @sum=@sum+@@error
   --判斷是否成功
   if @sum<>0
   begin
    set @returnNum=2--轉(zhuǎn)賬失敗
    rollback
   end
   else
   begin
    set @returnNum=1--轉(zhuǎn)賬成功
    commit
   end
  end
 else
 begin
  set @returnNum=3--余額不足
 end
end
go

--執(zhí)行測(cè)試：
declare @ret int
execute pro_transfer_szmbank 
@from='1',
@to='2',
@balance='10',
@returnNum=@ret output--注意輸出參數(shù)在執(zhí)行語(yǔ)句中也是要表明"output"
print @ret --結(jié)果是打印:1,即存儲(chǔ)過(guò)程實(shí)現(xiàn)成功

static void Main(string[] args)
{
  //轉(zhuǎn)出賬戶(hù)的Id
  int from = 1;
  //轉(zhuǎn)入賬戶(hù)的Id
  int to = 2;
  //轉(zhuǎn)賬金額
  decimal balance = 10;

  SqlParameter[] param =
  {
    new SqlParameter ("@from",from),
    new SqlParameter("@to",to),
    new SqlParameter ("@balance",balance),
    //-------------------------------注意：這里設(shè)置為輸出參數(shù)
    new SqlParameter ("@returnNum",System.Data.SqlDbType.Int{Direction=System.Data.ParameterDirection.Output }
  };

  //------------------------設(shè)置CommonType為StorProcedure類(lèi)型
  SqlHelper.ExecuteNonquery("pro_transfer_szmbank",System.Data.CommandType.StoredProcedure, param);

  //------------------------獲取輸出參數(shù)
  //根據(jù)輸出參數(shù)判斷轉(zhuǎn)賬結(jié)果
  int outPutparam = Convert.ToInt16(param[3].Value);

  switch (outPutparam)
  {
    case 1: Console.WriteLine($"success:從Id:{from}轉(zhuǎn)賬{balance}元到Id：{to}");break;
    case 2: Console.WriteLine("error"); break;
    case 3: Console.WriteLine("余額不足"); break;
  }

  Console.ReadKey();
}

create procedure [dbo].[pro_ReturnDataTable]
as
begin
 select Id as 用戶(hù)ID ,Balance as 余額 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["用戶(hù)ID"].ToString() + ":" + row["余額"].ToString());
  }
  Console.ReadKey();
  //TransferAccounts();
  ReturnDataTable();
}