using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Configuration;
using System.Data.SqlClient;

namespace _20150408
{
    public partial class Form1 : Form
    {
        int pageIndex;
        public Form1()
        {
            InitializeComponent();
        }

        private void fillToolStripMenuItem_Click(object sender, EventArgs e)
        {

            GetData();
           
        }
       
        //使用dataadapter进行更新
        private void updateToolStripMenuItem_Click(object sender, EventArgs e)
        {
            DataTable dt = new DataTable();
            dt = dataGridView1.DataSource as DataTable;
            //获取数据库连接字符串
            string connStr = System.Configuration.ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;
           
            using (SqlConnection conn = new SqlConnection(connStr))
            {
               
                SqlDataAdapter adapter = new SqlDataAdapter();
                //构造InsertCommand
                string sqlStrInsert ="insert into Student values(@name,@address)";
                SqlCommand insertCommand = new SqlCommand(sqlStrInsert ,conn);
                insertCommand.Parameters.Add("@name", SqlDbType.NVarChar, 50, "sName");//sName为table的列名
                insertCommand.Parameters.Add("@address", SqlDbType.NVarChar, 50, "sAddress");
                adapter.InsertCommand = insertCommand;
                //构造UpadateCommand
                string sqlStrUpadate = "update Student  set  sName=@name,sAddress=@address where sId=@id";
                SqlCommand upadateCommand = new SqlCommand(sqlStrUpadate,conn);
                upadateCommand.Parameters.Add("@name",SqlDbType.NVarChar,50,"sName");
                upadateCommand.Parameters.Add("@address", SqlDbType.NVarChar, 50, "sAddress");
                upadateCommand.Parameters.Add("@id", SqlDbType.Int, 50, "sId");
                adapter.UpdateCommand = upadateCommand;
                //构造DeleteCommand
                string sqlDelete = "delete from Student where sId=@id";
                 SqlCommand  deleteCommand=new SqlCommand (sqlDelete,conn);
                deleteCommand.Parameters.Add("@id",SqlDbType.Int ,4,"sId");
                adapter.DeleteCommand = deleteCommand;

                conn.Open();
                adapter.Update(dt);
            }
            GetData();
            //SqlConnection conStr = new SqlConnection();
        }

        //进行分页查询
        private void Pages_Click(object sender,EventArgs e)
        {
            ToolStripMenuItem menu = sender as ToolStripMenuItem;
           int  pageSize1 = Convert.ToInt32(pageSize.Text );
            //计算最后一页的信息
            int lastIndex=(int)Math.Ceiling(GetRowcount()*1.0/pageSize1);
          
            switch (menu.Text)
            {
                case "First":
                    pageIndex = 1;
                   
                    break;
                case "Last":
                    pageIndex = lastIndex;
                  
                    break;
                case "Prev":
                    pageIndex--;
                    if (pageIndex<=0)
                    {
                        pageIndex = 1;
                    }
                  
                    break;
                case "Next":
                    pageIndex++;
                    if (pageIndex>=lastIndex)
                    {
                        pageIndex = lastIndex;
                    }
                   
                    break;


            }
            GetData();
        }
        //获取总行数
        private int GetRowcount()
        {
            int rowCount = 0;
            string connStr=System.Configuration.ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;
            using (SqlConnection  conn=new SqlConnection (connStr ))
            {
                string sql = "select COUNT(*) from Student   ";
                SqlCommand cmd = new SqlCommand(sql ,conn);
                conn.Open();
                rowCount = Convert.ToInt32(cmd.ExecuteScalar());
            }
            return rowCount;
        }
        //private void  DataBind(int pageSize2,int pageIndex)
        //{
        //    int sIndex = pageSize2*(pageIndex -1)+1;
        //    int eIndex = pageSize2 * pageIndex;
        //    DataTable dt = new DataTable();
        //    string connStr = System.Configuration.ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;
        //    using (SqlConnection conn = new SqlConnection(connStr))
        //    {
        //        string sqlStr = "select rowIndex ,sId ,sName,sAddress  from vStudent where rowIndex between @sIndex and @eIndex ";
        //        SqlCommand cmd = new SqlCommand(sqlStr,conn );
        //        cmd.Parameters.AddWithValue("@sIndex", sIndex);
        //        cmd.Parameters.AddWithValue("@eIndex",eIndex );
        //        SqlDataAdapter adapter = new SqlDataAdapter(cmd);
        //        DataSet ds = new DataSet();
        //        conn.Open();
        //        adapter.Fill(ds);
        //        dt = ds.Tables[0];
        //    }
         
        //    //return dt;
        //    dataGridView1.DataSource = dt;
          
        //}

        private void Form1_Load(object sender, EventArgs e)
        {
            pageSize.SelectedIndex = 0;
            pageIndex = 1;
        }

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }
        //获取数据并绑定数据
        private void GetData()
        {
            int pageSize2 = Convert.ToInt32(pageSize.Text);

            int sIndex = pageSize2 * (pageIndex - 1) + 1;
            int eIndex = pageSize2 * pageIndex;
            DataTable dt = new DataTable();
            string connStr = System.Configuration.ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;
            using (SqlConnection conn = new SqlConnection(connStr))
            {
                string sqlStr = "select rowIndex ,sId ,sName,sAddress from vStudent where rowIndex between @sIndex and @eIndex ";
                SqlCommand cmd = new SqlCommand(sqlStr, conn);
                cmd.Parameters.AddWithValue("@sIndex", sIndex);
                cmd.Parameters.AddWithValue("@eIndex", eIndex);
                SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                DataSet ds = new DataSet();
                conn.Open();
                adapter.Fill(ds);
                dt = ds.Tables[0];
            }

            dataGridView1.DataSource = dt;
        }

        private void pageSize_SelectedIndexChanged(object sender, EventArgs e)
        {
            GetData();
        }

      


    }
}