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

namespace DAL
{
    public class SQLHelpers
    {

        /***连接数据库****/
        public static string connectionString = "User ID=HX_User;Password=lc@841022;Data Source=.;Initial Catalog=HX_APSsys_WDR";
      //  PublicFunc publicFunc = new PublicFunc();
        #region  执行简单SQL语句
        public static SqlDataReader GetReader(string sql)
        {
            SqlConnection conn = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand(sql, conn);
            try
            {
                conn.Open();
                SqlDataReader objReader =
                    cmd.ExecuteReader(CommandBehavior.CloseConnection);
                return objReader;
            }
            catch (Exception ex)
            {
                conn.Close();
                throw ex;
            }
        }
        public static SqlDataReader GetReader(string sql, SqlParameter[] param)
        {
            SqlConnection conn = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand(sql, conn);
            try
            {
                conn.Open();
                cmd.Parameters.AddRange(param);
                SqlDataReader objReader =
                    cmd.ExecuteReader(CommandBehavior.CloseConnection);
                return objReader;
            }
            catch (Exception ex)
            {
                conn.Close();
                throw ex;
            }
        }
        /// <summary>
        /// 执行SQL语句，返回影响的记录数
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <returns>影响的记录数</returns>
        public static int ExecuteSql(string SQLString)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        int rows = cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch (System.Data.SqlClient.SqlException e)
                    {

                        connection.Close();
                        throw e;

                    }
                }
            }
        }
        /// <summary>
        /// 查询单一结果
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static object GetSingleResult(string sql)
        {
            SqlConnection conn = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand(sql, conn);
            try
            {
                conn.Open();
                return cmd.ExecuteScalar();
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                conn.Close();
            }
        }
        public static object GetSingleResult(string sql, SqlParameter[] param)
        {
            SqlConnection conn = new SqlConnection(connectionString);
            SqlCommand comm = new SqlCommand(sql, conn);
            try
            {
                conn.Open();
                comm.Parameters.AddRange(param);
                return comm.ExecuteScalar();
            }
            catch (Exception ex)
            {
                WriteLog(ex.Message);
                throw new Exception("在调用public static object GetSingleResult(string sql,SqlParameter[] param)方法时出错，错误信息" + ex.Message);
            }
            finally
            {
                conn.Close();
            }
        }
        /// <summary>
        /// 执行多结果查询（select）
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>

        public static int ExecuteSqlByTime(string SQLString, int Times)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        cmd.CommandTimeout = Times;
                        int rows = cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch (System.Data.SqlClient.SqlException e)
                    {


                        connection.Close();
                        throw e;
                    }
                }
            }
        }


        public static int ExecuteSqlTran(List<String> SQLStringList)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                SqlTransaction tx = conn.BeginTransaction();
                cmd.Transaction = tx;
                try
                {
                    int count = 0;
                    for (int n = 0; n < SQLStringList.Count; n++)
                    {
                        string strsql = SQLStringList[n];
                        if (strsql.Trim().Length > 1)
                        {
                            cmd.CommandText = strsql;
                            count += cmd.ExecuteNonQuery();
                        }
                    }
                    tx.Commit();
                    return count;
                }
                catch
                {

                    tx.Rollback();
                    return 0;
                }
            }
        }
        /// <summary>
        /// 执行带一个存储过程参数的的SQL语句。
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
        /// <returns>影响的记录数</returns>
        public static int ExecuteSql(string SQLString, string content)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand(SQLString, connection);
                System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);
                myParameter.Value = content;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (System.Data.SqlClient.SqlException e)
                {

                    throw e;
                }
                finally
                {

                    cmd.Dispose();
                    connection.Close();
                }
            }
        }
        #region 执行带参数的SQL语句

        /// <summary>
        /// 执行SQL语句，返回影响的记录数
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <returns>影响的记录数</returns>
        public static int ExecuteSql(string SQLString, params SqlParameter[] cmdParms)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        int rows = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                        return rows;
                    }
                    catch (System.Data.SqlClient.SqlException e)
                    {
                        // WriteLog(e.Message);
                        throw e;
                    }
                }
            }
        }
        #endregion
        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, string cmdText, SqlParameter[] cmdParms)
        {
            if (conn.State != ConnectionState.Open)
                conn.Open();
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            if (trans != null)
                cmd.Transaction = trans;
            cmd.CommandType = CommandType.Text;//cmdType;
            if (cmdParms != null)
            {


                foreach (SqlParameter parameter in cmdParms)
                {
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
                        (parameter.Value == null))
                    {
                        parameter.Value = DBNull.Value;
                    }
                    cmd.Parameters.Add(parameter);
                }
            }
        }

        /// <summary>
        /// 执行带一个存储过程参数的的SQL语句。
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
        /// <returns>影响的记录数</returns>
        public static object ExecuteSqlGet(string SQLString, string content)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand(SQLString, connection);
                System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.VarChar);
                myParameter.Value = content;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    object obj = cmd.ExecuteScalar();
                    if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                    {
                        return null;
                    }
                    else
                    {
                        return obj;
                    }
                }
                catch (System.Data.SqlClient.SqlException e)
                {

                    throw e;
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }
        /// <summary>
        /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
        /// </summary>
        /// <param name="strSQL">SQL语句</param>
        /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
        /// <returns>影响的记录数</returns>
        /// <summary>
        /// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
        /// </summary>
        /// <param name="strSQL">查询语句</param>
        /// <returns>SqlDataReader</returns>
        public static SqlDataReader ExecuteReader(string strSQL)
        {
            SqlConnection connection = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand(strSQL, connection);
            try
            {
                connection.Open();
                SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);

                return myReader;
            }
            catch (System.Data.SqlClient.SqlException e)
            {

                throw e;
            }

        }
        public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand(strSQL, connection);
                System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@fs", SqlDbType.Image);
                myParameter.Value = fs;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (System.Data.SqlClient.SqlException e)
                {

                    throw e;
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }
        #endregion

        /// <summary>
        /// 执行查询语句，返回DataSet
        /// </summary>
        /// <param name="SQLString">查询语句</param>
        /// <returns>DataSet</returns>
        public static DataSet Query(string SQLString)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.Open();
                    SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
                    command.Fill(ds, "ds");
                }
                catch (System.Data.SqlClient.SqlException ex)
                {

                    throw new Exception(ex.Message);
                }
                return ds;
            }
        }
        /// <summary>
        /// 执行返回结果集的操作
        /// </summary>
        /// <returns></returns>
        public static SqlDataReader GetReaderByProcedure(string storeProduceName, SqlParameter[] param)
        {
            SqlConnection conn = new SqlConnection(connectionString);
            SqlCommand comm = new SqlCommand();
            comm.Connection = conn;
            comm.CommandType = CommandType.StoredProcedure;
            comm.CommandText = storeProduceName;
            try
            {
                conn.Open();
                if (param != null)
                {
                    comm.Parameters.AddRange(param);
                }
                return comm.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                ///将错误信息写入日志
                //WriteLog("执行GetReaderByProcedure(string storeProduceName, SqlParameter[] param)时发生错误,错误信息" + ex);
                throw ex;
            }
        }
        /// <summary>
        /// 执行增删改方法（insert、update、delete类型的SQL语句）
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static int Update(string sql)
        {
            SqlConnection conn = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand(sql, conn);
            try
            {
                conn.Open();
                return cmd.ExecuteNonQuery();
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                conn.Close();
            }
        }

        /// <summary>
        /// 执行带参数的SQL语句或存储过程
        /// </summary>
        /// <param name="sqlOrProcedure">sql语句或存储过程名称</param>
        /// <param name="param">参数</param>
        /// <param name="isProcedure">是否为存储过程</param>
        /// <returns></returns>
        public static int Update(string sqlOrProcedure, SqlParameter[] param, bool isProcedure)
        {
            SqlConnection conn = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand(sqlOrProcedure, conn);
            if (isProcedure)
            {
                cmd.CommandType = CommandType.StoredProcedure;
            }
            try
            {
                conn.Open();
                cmd.Parameters.AddRange(param);
                return cmd.ExecuteNonQuery();
            }
            catch (Exception ex)
            {
                //WriteErrLog("执行 public static int Update(string sqlOrProcedure,SqlParameter[] param,bool isProcedure)方法时出错,错误信息" + ex.Message);
                throw ex;
            }
            finally
            {
                conn.Close();
            }
        }
        /// <summary>
        /// 执行存储过程
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <param name="tableName">DataSet结果中的表名</param>
        /// <returns>DataSet</returns>
        public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                DataSet dataSet = new DataSet();
                connection.Open();
                SqlDataAdapter sqlDA = new SqlDataAdapter();
                sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
                sqlDA.Fill(dataSet, tableName);
                connection.Close();
                return dataSet;
            }
        }
        /// <summary>
        /// 构建 SqlCommand 对象(用来返回一个结果集，而不是一个整数值)
        /// </summary>
        /// <param name="connection">数据库连接</param>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <returns>SqlCommand</returns>
        private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
        {
            SqlCommand command = new SqlCommand(storedProcName, connection);
            command.CommandType = CommandType.StoredProcedure;
            foreach (SqlParameter parameter in parameters)
            {
                if (parameter != null)
                {
                    // 检查未分配值的输出参数,将其分配以DBNull.Value.
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
                        (parameter.Value == null))
                    {
                        parameter.Value = DBNull.Value;
                    }
                    command.Parameters.Add(parameter);
                }
            }

            return command;
        }
        //用存储过程插入数据

        public static DataSet GetDataSetByProcedure(string spName, SqlParameter[] param)
        {
            SqlConnection conn = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand(spName, conn);
            cmd.CommandType = CommandType.StoredProcedure;
            try
            {
                conn.Open();
                cmd.Parameters.AddRange(param);
                SqlDataAdapter sda = new SqlDataAdapter();
                sda.SelectCommand = cmd;
                DataSet ds = new DataSet();
                sda.Fill(ds, "ds");
                cmd.Parameters.Clear();
                return ds;

            }
            catch (Exception ex)
            {
                //将错误信息写入系统日志
                string info = "调用GetReaderByProcedure(string spName, SqlParameter[] param)方法时发生错误：" + ex.Message;
                WriteLog(ex.Message);
                throw new Exception(info);
            }
        }
        public static SqlDataReader MyReader(string strSQL)
        {
            SqlConnection connection = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand(strSQL, connection);
            try
            {
                connection.Open();
                SqlDataReader myReader = cmd.ExecuteReader();
                return myReader;
            }
            catch (System.Data.SqlClient.SqlException e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                cmd.Dispose();
                //connection.Close();
            }

        }
        public static int ExecuteSql1(string SQLString, params SqlParameter[] myParameter)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand(SQLString, connection);
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddRange(myParameter);

                try
                {
                    connection.Open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (System.Data.SqlClient.SqlException e)
                {
                    WriteLog(e.Message);
                    throw e;
                }
                finally
                {

                    cmd.Dispose();
                    connection.Close();
                }
            }
        }
        /// <summary>
        /// 使用事务提交带参数的SQL语句
        /// </summary>
        /// <param name="mainSql">主SQL语句</param>
        /// <param name="mainparam">主SQL参数</param>
        /// <param name="detailSql">明细SQL</param>
        /// <param name="detailparam">明细SQL语句对应的参数数组集合</param>
        /// <returns>返回事务是否成功</returns>
        public static bool UpdateByTran(string mainSql, SqlParameter[] mainparam, string detailSql, List<SqlParameter[]> detailparam)
        {
            SqlConnection conn = new SqlConnection(connectionString);
            SqlCommand comm = new SqlCommand();
            comm.Connection = conn;
            try
            {
                conn.Open();
                comm.Transaction = conn.BeginTransaction();//开启事务
                if (mainSql != null && mainSql.Length != 0)
                {
                    comm.CommandText = mainSql;
                    if (mainparam != null)
                        comm.Parameters.AddRange(mainparam);
                    comm.ExecuteNonQuery();
                }
                if (detailparam != null)
                {
                    foreach (SqlParameter[] param in detailparam)
                    {
                        comm.CommandText = detailSql;
                        comm.Parameters.Clear();//清空参数
                        comm.Parameters.AddRange(param);
                        comm.ExecuteNonQuery();
                    }
                }
                comm.Transaction.Commit();//提交事务
                return true;
            }
            catch (Exception ex)
            {
                if (comm.Transaction != null)
                {
                    comm.Transaction.Rollback();//回滚事务
                }
                WriteLog(ex.Message);
                throw new Exception("在调用 public static bool UpdateByTran(string mainSql,SqlParameter[] mainparam,string detailSql,List<SqlParameter[]> detailparam)方法时出错，错误信息" + ex.Message);
            }
            finally
            {
                if (comm.Transaction != null)
                {
                    comm.Transaction = null;
                }
            }
        }
        #region SQL错误日志记录
        /// <summary>
        /// SQL错误日志记录
        /// </summary>
        public static void WriteLog(string loginfo)
        {
            FileStream fs = new FileStream("SQLHelper.Log", FileMode.Append);
            StreamWriter sw = new StreamWriter(fs);
            string Log = GetDBSqlDateTime() + "  错误信息: " + loginfo;
            sw.WriteLine(Log);
            sw.Close();
            fs.Close();
        }
        #endregion
        /// <summary>
        /// 获取服务器时间
        /// </summary>
        /// <returns></returns>
        public static DateTime GetDBSqlDateTime()
        {
            return Convert.ToDateTime(GetSingleResult("select getdate()"));
        }
    }
}