using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;

namespace DAL
{
    /// <summary>
    /// 存储分页父类
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public static class PageBase<T> where T : new()
    {
        /// <summary>
        /// 分页查询
        /// </summary>
        /// <param name="t">类的对象</param>
        /// <param name="type">对象区分</param>
        /// <param name="tableName">查询的表名</param>
        /// <param name="fields">查询的字段名(全部字段为*)</param>
        /// <param name="orderField">排序字段(必须!支持多字段)</param>
        /// <param name="sqlWhere">条件语句(不用加where)</param>
        /// <param name="pageSize">每页多少条记录</param>
        /// <param name="pageIndex">指定当前为第几页</param>
        /// <param name="totalPage">返回总页数</param>
        /// <param name="totalRecord">返回总条数</param>
        /// <returns>返回集合</returns>
        public static List<T> excutePageSql(T t, string type, string tableName, string fields, string orderField, string sqlWhere, int pageSize, int pageIndex, out int totalPage, out int totalRecord, params SqlParameter[] param)
        {
            List<SqlParameter> spList = new List<SqlParameter>();

            spList.Add(new SqlParameter("@TableName", SqlDbType.VarChar));
            spList.Add(new SqlParameter("@Fields", SqlDbType.VarChar));
            spList.Add(new SqlParameter("@OrderField", SqlDbType.VarChar));
            spList.Add(new SqlParameter("@sqlWhere", SqlDbType.VarChar));
            spList.Add(new SqlParameter("@pageSize", SqlDbType.Int));
            spList.Add(new SqlParameter("@pageIndex", SqlDbType.Int));
            spList.Add(new SqlParameter("@TotalPage", SqlDbType.Int));
            spList.Add(new SqlParameter("@Record", SqlDbType.Int));

            spList[0].Value = tableName;
            spList[1].Value = fields;
            spList[2].Value = orderField;
            spList[3].Value = sqlWhere;
            spList[4].Value = pageSize;
            spList[5].Value = pageIndex;
            spList[6].Direction = ParameterDirection.Output;
            spList[7].Direction = ParameterDirection.Output;

            List<T> list = ServiceBase<T>.excuteSql(new T(), type, "exec_page", CommandType.StoredProcedure, spList.ToArray());

            //获取总页数
            try
            {
                totalPage = Convert.ToInt32(spList[6].Value);
            }
            catch
            {
                totalPage = 0;

            }
            try
            {
                totalRecord = Convert.ToInt32(spList[7].Value);
            }
            catch
            {
                totalRecord = 0;
            }

            return list;
        }
    }
}