using Microsoft.EntityFrameworkCore;
using Oracle.ManagedDataAccess.Client;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Linq;
using Znyc.Recruitment.Admin.Commons.IDbContext;

namespace Znyc.Recruitment.Admin.Commons.DbContextCore
{
    /// <summary>
    ///     Oracle上下文
    /// </summary>
    public class OracleDbContext : BaseDbContext, IOracleDbContext
    {
        /// <summary>
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="cmdTimeout"></param>
        /// <param name="parameters"></param>
        /// <returns></returns>
        public override DataTable GetDataTable(string sql, int cmdTimeout = 30, params DbParameter[] parameters)
        {
            return GetDataTables(sql, cmdTimeout, parameters).FirstOrDefault();
        }

        /// <summary>
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="cmdTimeout"></param>
        /// <param name="parameters"></param>
        /// <returns></returns>
        public override List<DataTable> GetDataTables(string sql, int cmdTimeout = 30, params DbParameter[] parameters)
        {
            List<DataTable> dts = new List<DataTable>();
            //TODO： connection 不能dispose 或者 用using，否则下次获取connection会报错提示“the connectionstring property has not been initialized。”
            DbConnection connection = Database.GetDbConnection();
            if (connection.State != ConnectionState.Open)
            {
                connection.Open();
            }

            using (OracleCommand cmd = new OracleCommand(sql, (OracleConnection)connection))
            {
                cmd.CommandTimeout = cmdTimeout;
                if (parameters != null && parameters.Length > 0)
                {
                    cmd.Parameters.AddRange(parameters);
                }

                using (OracleDataAdapter da = new OracleDataAdapter(cmd))
                {
                    using (DataSet ds = new DataSet())
                    {
                        da.Fill(ds);
                        foreach (DataTable table in ds.Tables)
                        {
                            dts.Add(table);
                        }
                    }
                }
            }

            connection.Close();

            return dts;
        }
    }
}