using Ant.Core.Visitors;
using Ant.Data;
using Ant.Infrastructure;
using Ant.Query;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;

namespace Ant.SqlServer
{
    class DbContextServiceProvider : IDbContextServiceProvider
    {
        PagingMode _pagingMode;
        public DbContextServiceProvider(PagingMode pagingMode)
        {
            this._pagingMode = pagingMode;
        }
        /// <summary>
        /// 创建是SQL2012之前的数据库带分页的
        /// </summary>
        /// <returns></returns>
        public IDbExpressionTranslator CreateDbExpressionTranslator()
        {
            if (_pagingMode == Ant.Data.PagingMode.ROW_NUMBER)
            {
                return DbExpressionTranslator.Instance;
            }
            else if (_pagingMode == Ant.Data.PagingMode.OFFSET_FETCH)
            {
                return DbExpressionTranslator_OffsetFetch.Instance;
            }

            throw new NotSupportedException();
        }
    }
}