using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WFormSynchronizeData_SMR 
{
    
    public class DBHelper 
    {
        private SqlConnection MainCn;//创建连接对象
        SqlTransaction MainTran;
        public string sServer;
        public string sDataBase;
        public string sUser;
        public string sPassword;
        //开始事务
        public void BeginTran()
        {
            if (!this.CnOpen())
                return;
            MainTran = MainCn.BeginTransaction();
        }
        //结束事务
        public void Commit()
        {
            MainTran.Commit();
            CnClose();
        }
        //回滚事务
        public void RollBack()
        {
            MainTran.Rollback();
            CnClose();
        }
        public DBHelper()
        {
            //sServer = "47.96.97.237,15127";
            //sDataBase = "HX_LMESsys";
            //sUser = "HX_USER";
            //sPassword = "lc@841022";
            //斯莫尔
            sServer = "10.11.18.195";
            sDataBase = "HX_LMESsys_test";
            sUser = "HX_USER";
            sPassword = "lc@841022";
        }

        private bool CnOpen()//OPEN数据库连接
        {
            if (sServer == "" || sServer == "没有找到！")
            {
                throw new Exception("错误的服务器名!" + System.Environment.CurrentDirectory);
            }
            if (sDataBase == "" || sDataBase == "没有找到！")
            {
                throw new Exception("错误的数据库名!");
            }
            if (MainCn == null)
            {
                MainCn = new SqlConnection("Data Source=" + sServer + ";DataBase=" + sDataBase + ";User ID=" + sUser + ";PWD=" + sPassword + ";max pool size=32767");
            }
            if (MainCn.State == System.Data.ConnectionState.Closed)
            {
                try
                {
                    MainCn.Open();
                    return true;
                }
                catch (Exception e)
                {
                    throw new Exception(e.Message + "," + sServer + "," + sDataBase);
                }
            }
            else
                return true;
        }

        public void CnClose()//关闭数据库连接
        {
            if (MainCn != null)
                MainCn.Close();
        }

        public void CnDispose()//释放资源
        {
            if (MainCn != null)
            {
                MainCn.Dispose();
                MainCn = null;
            }
        }

        /// <summary>
        /// 执行SQL无返回值
        /// </summary>
        /// <param name="procName"></param>
        /// <param name="sErrMessage"></param>
        /// <returns></returns>
        public void RunProc(string procName)
        {
            if (!this.CnOpen())
            {
                return;
                //sErrMessage = "连接数据库失败！";
            }
            try
            {
                SqlCommand cmd = new SqlCommand(procName, MainCn);
                cmd.CommandTimeout = 600;
                cmd.Transaction = MainTran;
                cmd.ExecuteNonQuery();
                return;
            }
            catch (Exception e)
            {

                throw (e);
                //return;
            }
        }

        /// <summary>
        /// 执行
        /// </summary>
        /// <param name="procName"></param>
        /// <param name="sErrMessage"></param>
        /// <returns></returns>
        public void RunProc(string procName, ref string sErr)
        {
            if (!this.CnOpen())
            {
                sErr = "连接数据库失败！";
                return;

            }
            try
            {
                //ClsPub.sSQLInfo = procName;
                SqlCommand cmd = new SqlCommand(procName, MainCn);
                cmd.CommandTimeout = 600;
                cmd.Transaction = MainTran;
                cmd.ExecuteNonQuery();
                return;
            }
            catch (Exception e)
            {
                sErr = e.Message;
                //ClsPub.sErrInfo = e.Message;
                throw (e);
                //return;
            }
        }
        /// <summary>
        /// 递入参数执行SQL并返回DATASET
        /// </summary>
        /// <param name="procName">执行语句</param>
        /// <param name="prams">参数</param>
        /// <param name="tbName">表名</param>
        /// <param name="sErrMessage">异常信息</param>
        /// <returns></returns>
        public DataSet RunProcReturn(string procName, SqlParameter[] prams, string tbName)
        {
            SqlDataAdapter dap = CreateDataAdaper(procName, prams);
            if (dap == null)
                return null;
            DataSet ds = new DataSet();
            try
            {
                 //ClsPub.sSQLInfo = procName;
                dap.Fill(ds, tbName);
                return ds;
            }
            catch (Exception e)
            {
                //ClsPub.sErrInfo = e.Message;
                throw (e);
                return null;
            }
        }
        /// <summary>
        /// 执行SQL并返回DATASET
        /// </summary>
        /// <param name="procName">执行语句</param>
        /// <param name="tbName">表名</param>
        /// <param name="sErrMessage">异常信息</param>
        /// <returns></returns>
        public DataSet RunProcReturn(string procName, string tbName)
        {
            SqlDataAdapter dap = CreateDataAdaper(procName, null);
            DataSet ds = new DataSet();
            try
            {
                //ClsPub.sSQLInfo = procName;
                dap.Fill(ds, tbName);
                return ds;
            }
            catch (Exception e)
            {
                //ClsPub.sErrInfo = e.Message;
                throw (e);
                return null;
            }
        }
        /// <summary>
        /// 执行SQL并返回DATASET和错误信息
        /// </summary>
        /// <param name="procName">执行语句</param>
        /// <param name="tbName">表名</param>
        /// <param name="sErrMessage">异常信息</param>
        /// <returns></returns>
        public DataSet RunProcReturn(string procName, string tbName, ref string sErr)
        {
            SqlDataAdapter dap = CreateDataAdaper(procName, null);
            DataSet ds = new DataSet();
            try
            {
                 //ClsPub.sSQLInfo = procName;
                dap.Fill(ds, tbName);
                return ds;
            }
            catch (Exception e)
            {
                sErr = e.Message;
                //ClsPub.sErrInfo = e.Message;
                return null;
            }
        }

        private SqlDataAdapter CreateDataAdaper(string procName, SqlParameter[] prams)
        {
            if (this.CnOpen())
            {
                SqlDataAdapter dap = new SqlDataAdapter(procName, MainCn);
                dap.SelectCommand.CommandType = CommandType.Text;
                dap.SelectCommand.CommandTimeout = 600;
                dap.SelectCommand.Transaction = MainTran;
                if (prams != null)
                {
                    foreach (SqlParameter parameter in prams)
                        dap.SelectCommand.Parameters.Add(parameter);
                }
                dap.SelectCommand.Parameters.Add(new SqlParameter("ReturnValue", SqlDbType.Int, 4,
                    ParameterDirection.ReturnValue, false, 0, 0,
                    string.Empty, DataRowVersion.Default, null));
                return dap;
            }
            else
            {
                return null;
            }
        }
    }
}