using FangYar.Model.TBL;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Odbc;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace FangYar.Common
{
    /// <summary>
    /// clickhouse数据库连接查询帮助类
    /// </summary>
    public class ClickhouseHelp
    {
        /// <summary>
        /// Clickhouse数据库连接
        /// </summary>
        private static string connectionString = @"DSN=clickhouse.xfzn365.cn";


        /// <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 (OdbcConnection connection = new OdbcConnection(connectionString))
            {
                using (OdbcCommand cmd = new OdbcCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        int rows = cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch (Exception E)
                    {
                        connection.Close();
                        throw new Exception(E.Message);
                    }
                }
            }
        }


        /// <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 OdbcParameter[] cmdParms)
        {
            using (OdbcConnection connection = new OdbcConnection(connectionString))
            {
                using (OdbcCommand cmd = new OdbcCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        int rows = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                        return rows;
                    }
                    catch (Exception E)
                    {
                        throw new Exception(E.Message);
                    }
                }
            }
        }


        /// <summary>
        /// 替换sql语句中的参数占位为真实的参数值
        /// </summary>
        /// <param name="cmd">MySqlCommand对象</param>
        /// <param name="conn">数据库连接对象</param>
        /// <param name="trans">事务对象</param>
        /// <param name="cmdText">sql语句</param>
        /// <param name="cmdParms">参数值数组</param>
        private static void PrepareCommand(OdbcCommand cmd, OdbcConnection conn, OdbcTransaction trans, string cmdText, OdbcParameter[] 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 (OdbcParameter parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }



    }
}