using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlClient;
using System.Data;

namespace Pub_Class
{
    public class ClsSqlHelper:IDisposable
    {
        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 ClsSqlHelper()
        {
            sServer = ClsIni.ReadIni("Erp", "Server", ClsPub.AppPath + @"\"+"HXErp.ini");
            sDataBase = ClsIni.ReadIni("Erp", "DataBase", ClsPub.AppPath + @"\" + "HXErp.ini");
            sUser = ClsIni.ReadIni("Erp", "UserName", ClsPub.AppPath + @"\" + "HXErp.ini");
            sPassword = ClsIni.ReadIni("Erp", "PassWord", ClsPub.AppPath + @"\" + "HXErp.ini");
            
        }

        public bool CheckOpen()
        {
            if (sServer == "" || sServer == "没有找到！")
            {
                throw new Exception("错误的服务器名!");
            }
            if (sDataBase == "" || sDataBase == "没有找到！")
            {
                throw new Exception("错误的数据库名!");
            }
            SqlConnection oCn = new SqlConnection("Data Source=" + sServer + ";DataBase=master;User ID=" + sUser + ";PWD=" + sPassword + " ");
            try
            {
                oCn.Open();
                return true;
            }
            catch (Exception e)
            {
                //e.Message = e.Message + "," + sServer + "," + sDataBase; 
                //e.
                //throw (e);
                throw new Exception(e.Message + "," + sServer + "," + sDataBase);
            }
        }

        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!");
            }
            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 + " ");
            }
            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;
        }
        private void CnClose()//关闭数据库连接
        {
            if (MainCn != null)
                MainCn.Close();
        }
        private void CnDispose()//释放资源
        {
            if(MainCn!=null)
            {
                MainCn.Dispose();
                MainCn=null;
            }
        }
        /// <summary>
        /// 转换参数
        /// </summary>
        /// <param name="ParamName">存储过程名称或命令文本</param>
        /// <param name="DbType">参数类型</param></param>
        /// <param name="Size">参数大小</param>
        /// <param name="Value">参数值</param>
        /// <returns>新的 parameter 对象</returns>
        public SqlParameter MakeInParam(string ParamName, SqlDbType DbType, int Size, object Value)
        {
            return MakeParam(ParamName, DbType, Size, ParameterDirection.Input, Value); 
        }
        /// <summary>
        /// 初始化参数值
        /// </summary>
        /// <param name="ParamName">存储过程名称或命令文本</param>
        /// <param name="DbType">参数类型</param>
        /// <param name="Size">参数大小</param>
        /// <param name="Direction">参数方向</param>
        /// <param name="Value">参数值</param>
        /// <returns>新的 parameter 对象</returns>
        private SqlParameter MakeParam(string ParamName, SqlDbType DbType, Int32 Size, ParameterDirection Direction, object Value)
        {
            SqlParameter param;
            if (Size > 0)
                param = new SqlParameter(ParamName, DbType, Size);
            else
                param = new SqlParameter(ParamName, DbType);
            param.Direction = Direction;
            if (!(Direction == ParameterDirection.Output && Value == null))
                param.Value = Value;
            return param;
        }
        /// <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.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
            {
                SqlCommand cmd = new SqlCommand(procName, MainCn);
                cmd.Transaction = MainTran;
                cmd.ExecuteNonQuery();
                return;
            }
            catch (Exception e)
            {
                sErr =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
            {
                dap.Fill(ds, tbName);
                return ds;
            }
            catch (Exception e)
            {
                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
            {
                dap.Fill(ds, tbName);
                return ds;
            }
            catch (Exception e)
            {
                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
            {
                dap.Fill(ds, tbName);
                return ds;
            }
            catch (Exception e)
            {
                sErr = e.Message;
                throw (e);
                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 = 120;
                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;
            }
        }

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

        #region IDisposable 成员

        public void Dispose()
        {
            throw new Exception("The method or operation is not implemented.");
        }

        #endregion
    }
}