using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web;

namespace mipopoWeb.DAL
{
    public class Sqlhelper
    {
        /// <summary>
        /// 创建连接对象
        /// </summary>
        /// <returns></returns>
        public static SqlConnection GetConnection()
        {
            string name = ConfigurationManager.ConnectionStrings["dbStr"].ToString();
            return new SqlConnection(name);
        }
        /// <summary>
        /// 查询第一行第一列
        /// </summary>
        /// <param name="sql">执行的SQL语句</param>
        /// <param name="param">参数数组</param>
        /// <returns></returns>
        public static object ExecuteScalar(string sql, params SqlParameter[] param)
        {
            using (SqlConnection conn = GetConnection())
            {
                SqlCommand comm = new SqlCommand(sql, conn);
                if (param != null)
                {
                    comm.Parameters.AddRange(param);
                }
                conn.Open();
                object obj = comm.ExecuteScalar();
                return obj;
            }
        }
        /// <summary>
        /// 查询(整张表)
        /// </summary>
        /// <param name="sql">执行的SQL语句</param>
        /// <param name="param">参数数组</param>
        /// <returns></returns>
        public static SqlDataReader ExecuteReader(string sql, params SqlParameter[] param)
        {
            SqlConnection conn = GetConnection();
            SqlCommand comm = new SqlCommand(sql, conn);
            if (param != null)
            {
                comm.Parameters.AddRange(param);
            }
            conn.Open();
            SqlDataReader obj = comm.ExecuteReader(CommandBehavior.CloseConnection);
            return obj;
        }
        /// <summary>
        /// 增删改
        /// </summary>
        /// <param name="sql">执行的SQL语句</param>
        /// <param name="param">参数数组</param>
        /// <returns></returns>
        public static int ExecuteNonQuery(string sql, params SqlParameter[] param)
        {
            using (SqlConnection conn = GetConnection())
            {
                SqlCommand comm = new SqlCommand(sql, conn);
                if (param != null)
                {
                    comm.Parameters.AddRange(param);
                }
                conn.Open();
                int obj = comm.ExecuteNonQuery();
                return obj;
            }
        }
        /// <summary>
        /// 返回DataTable
        /// </summary>
        /// <param name="sql">执行的SQL语句</param>
        /// <returns></returns>
        public static DataTable FillTable(string sql)
        {
            SqlDataAdapter adapter = new SqlDataAdapter(sql, GetConnection());
            DataTable dt = new DataTable();
            adapter.Fill(dt);
            return dt;
        }
    }
}