using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Odbc;
using System.Data.OleDb;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace GetHttpData.SDK
{
    public class DBHelper
    {
        /// <summary>
        /// 本地数据库连接
        /// </summary>
        /// <returns></returns>
        public static OdbcConnection AnyWhereConn()
        {
            string strConn = "DSN=anysql1;UID=dba;PWD=sql;";
            OdbcConnection Conany = new OdbcConnection(strConn);
            return Conany;
        }

        /// <summary>
        /// 执行SQL语句，返回受影响的行数
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        public static int ExcuteSql(string SQLString)
        {
            using (OdbcConnection conany = AnyWhereConn())
            {
                using (OdbcCommand cmd = new OdbcCommand(SQLString, conany))
                    try
                    {
                        conany.Open();
                        int rows = cmd.ExecuteNonQuery();
                        conany.Close();
                        return rows;
                    }
                    catch (OdbcException ex)
                    {
                        throw new Exception(ex.Message);
                    }
            }

        }

        /// <summary>
        /// 本地执行SQL语句并返回DataSet
        /// </summary>
        /// <param name="SelectSql">SQL语句</param>
        /// <returns></returns>
        public static DataSet ExecuteDataSet(string SelectSql)
        {
            using (OdbcConnection conany = AnyWhereConn())
            {
                DataSet _DataSet = new DataSet();
                try
                {
                    OdbcDataAdapter _OdbcDataAdapter = new OdbcDataAdapter(SelectSql, conany);
                    _OdbcDataAdapter.Fill(_DataSet);
                    return _DataSet;
                }
                catch (Exception ex)
                {
                    throw new Exception(ex.Message);
                }
            }
        }

        private static string connstring = "DSN=anysql1;UID=dba;PWD=sql;";

        /// <summary>
        /// 查询本地数据库
        /// </summary>
        /// <param name="SqlString"></param>
        /// <returns></returns>
        public static DataSet QueryOdbc(string SqlString)
        {
            using (OdbcConnection conn = new OdbcConnection(connstring))
            {
                OdbcCommand cmd = new OdbcCommand(SqlString, conn);
                try
                {
                    conn.Open();
                    OdbcDataAdapter adp = new OdbcDataAdapter(cmd);
                    DataSet ds = new DataSet();
                    adp.Fill(ds);
                    conn.Close();
                    return ds;
                }
                catch (Exception ex)
                {
                    throw new Exception(ex.Message);
                }
            }
        }
        /// <summary>
        /// 保存数据
        /// </summary>
        /// <param name="SQLStringList"></param>
        public static void ExecuteSqlTran(List<string> SQLStringList)
        {
            using (OdbcConnection conn = new OdbcConnection(connstring))
            {
                conn.Open();
                OdbcCommand cmd = new OdbcCommand();
                cmd.Connection = conn;
                OdbcTransaction tx = conn.BeginTransaction();
                cmd.Transaction = tx;
                try
                {
                    for (int n = 0; n < SQLStringList.Count; n++)
                    {
                        string strsql = SQLStringList[n].ToString();
                        if (strsql.Trim().Length > 1)
                        {
                            cmd.CommandText = strsql;
                            cmd.ExecuteNonQuery();
                        }
                    }
                    tx.Commit();
                }
                catch (Exception E)
                {
                    tx.Rollback();
                    throw new Exception(E.Message);
                }
                finally
                {
                    conn.Close();
                }
            }
        }
        /// <summary>
        /// 保存数据
        /// </summary>
        /// <param name="SQLStringList"></param>
        public static void ExecuteSqlTran(string SQLString)
        {
            using (OdbcConnection conn = new OdbcConnection(connstring))
            {
                conn.Open();
                OdbcCommand cmd = new OdbcCommand();
                cmd.Connection = conn;
                OdbcTransaction tx = conn.BeginTransaction();
                cmd.Transaction = tx;
                try
                {
                    if (SQLString.Trim().Length > 1)
                    {
                        cmd.CommandText = SQLString;
                        cmd.ExecuteNonQuery();
                    }
                    tx.Commit();
                }
                catch (Exception E)
                {
                    tx.Rollback();
                    throw new Exception(E.Message);
                }
                finally
                {
                    conn.Close();
                }
            }
        }
    }
}