/*
 Sog 游戏基础库
 2016 by zouwei
 */

using System;
using System.Data;
using MySql.Data.MySqlClient;


namespace Sog
{
    public class MySqlDB : IDisposable
    {
        private string m_connectString;
        private MySqlConnection m_mysqlConn;
        private string m_db;
        private string m_ip;
        private string m_user;

        public MySqlDB(string db, string ip, string user, string password)
        {
            m_db = db;
            m_ip = ip;
            m_user = user;

            //经过实际测试，连接的时候需要设置utf8mb4且数据库字段的编码是utf8mb4才能正常写入4字节utf8字符，比如一些火星文，表情符
            m_connectString = string.Format("Database='{0}';Data Source='{1}';User Id='{2}';Password='{3}';charset='utf8mb4';pooling=true;Allow User Variables=True;sslmode=none", db, ip, user, password);
        }

        //支持重连
        public void OpenConn()
        {
            if (m_mysqlConn == null)
            {
                m_mysqlConn = new MySqlConnection(m_connectString);
            }

            try
            {
                m_mysqlConn.Open();
            }
            catch (Exception ex)
            {
                TraceLog.Error("connect mysql db {0} ip {1} user {2} error!", m_db, m_ip, m_user);
                TraceLog.Exception(ex);

                TraceLog.Error("Inner exception:");
                TraceLog.Exception(ex.InnerException);
            }

        }

        public void Dispose()
        {
            if (m_mysqlConn != null)
            {
                m_mysqlConn.Close();
                m_mysqlConn.Dispose();
                m_mysqlConn = null;
            }
        }

        public MySqlDataReader ExecReader(string strSql)
        {
            // strSql = MySqlHelper.EscapeString(strSql);
            MySqlDataReader reader = null;
            try
            {
                if (m_mysqlConn == null || m_mysqlConn.State == ConnectionState.Closed)
                {
                    OpenConn();
                }

                reader = MySqlHelper.ExecuteReader(m_mysqlConn, strSql);

                //TraceLog.Trace("exec sql success  {0} ", strSql);

                return reader;
            }
            catch (Exception ex)
            {
                TraceLog.Exception(ex);
                if (reader != null)
                {
                    reader.Close();
                }

                TraceLog.Error("MySqlDB.ExecReader throw error!");

                //抛出异常，不往下执行了，因为执行结果未知,逻辑层根据返回空判断记录不存在，本身是错误的!
                throw ex;
            }
        }

        public MySqlDataReader ExecReader(string strSql, params MySqlParameter[] sqlParams)
        {
            //strSql = MySqlHelper.EscapeString(strSql);

            MySqlDataReader reader = null;

            try
            {
                if (m_mysqlConn == null || m_mysqlConn.State == ConnectionState.Closed)
                {
                    OpenConn();
                }

                reader = MySqlHelper.ExecuteReader(m_mysqlConn, strSql, sqlParams);

                //TraceLog.Trace("exec sql success {0} ", strSql);

                return reader;
            }
            catch (Exception ex)
            {
                TraceLog.Exception(ex);

                if (reader != null)
                {
                    reader.Close();
                }

                //这种情况怎么处理
                TraceLog.Error("MySqlDB.ExecReader {0} throw error", strSql);
                throw ex;
            }
        }
        public bool ExecExist(string strSql, params MySqlParameter[] sqlParams)
        { 
            var Reader = ExecReader(strSql, sqlParams);
            var HasRows= Reader.HasRows;
            Reader.Dispose();
            return HasRows;
        }

        public int ExecNonQuery(string strSql, params MySqlParameter[] sqlParams)
        {
           // strSql = MySqlHelper.EscapeString(strSql);

            try
            {
                if (m_mysqlConn == null || m_mysqlConn.State == ConnectionState.Closed)
                {
                    OpenConn();
                }

                int ret = MySqlHelper.ExecuteNonQuery(m_mysqlConn, strSql, sqlParams);
                //TraceLog.Trace("exec sql success {0}, ret {1}", strSql, ret);

                return ret;
            }
            catch (Exception ex)
            {
                TraceLog.Exception(ex);

                //这种情况怎么处理
                TraceLog.Error("MySqlDB.ExecNonQuery with params throw error");
                throw ex;
            }
        }


        public void TestQuery()
        {
            string testSql = "select * from accountId where accountId=10001";

            MySqlCommand cmd = null;
            //MySqlTransaction trans = null;
            int count = 0;
            try
            {
                if (m_mysqlConn == null || m_mysqlConn.State == ConnectionState.Closed)
                {
                    OpenConn();
                }

                cmd = m_mysqlConn.CreateCommand();


                cmd.CommandType = CommandType.Text;
                cmd.CommandText = testSql;


                using (MySqlDataReader reader = cmd.ExecuteReader())
                {
                    if (reader.HasRows)
                    {
                        reader.Read();
                        int accountId = reader.GetInt32("accountId");

                        TraceLog.Trace("exec sql success {0} , accountId {1}", testSql, accountId);
                    }
                }

                //count = cmd.ExecuteNonQuery();

                TraceLog.Trace("exec sql {0} effect count {1}", testSql, count);
            }
            catch
            {

            }
            finally
            {

            }

        }
    }
}