ASP.NET简单SQL分页的实现

因为要写的是简单SQL语句实现分页所以SQL自然就不会很难啦！

1.IN NOT IN写法 效率低

--IN 和 NOT IN,效率较低
--这条语句的意思是查询五条数据不在前十条里的数据
SELECT TOP 5 * FROM TableName WHERE ID NOT IN(SELECT TOP 10 ID FROM TableName )

2.通过升序和降序排列

--通过排序进行分页
--首先查询十五条数据中的前五条 获取11到15的数据，因为是倒序，所以最后进行升序排列
SELECT * FROM(
    SELECT TOP 5 * FROM(
        SELECT TOP 15 * FROM TableName ORDER BY ID ASC) 
            AS TEMP1 ORDER BY ID DESC)
        AS TEMP2 ORDER BY ID ASC

3.使用SQL Server Row Num()函数

--首先Row_Number()函数要和 over 配套使用
--首先通过Row_Number()函数查询前十条数据 然后全部并且大于0条的数据
--简单来讲top10 相当于一页显示多少条数据 而0相当于当前页数
select * from (select top 10 ROW_NUMBER() over(order by id) as temp,* from sqlpagetest )as temp where xxx>0

实现分页

Dbhelper

   public DataTable PageBysql(int pageSize, int pageIndex)
        {
            string sql = string.Format("select * from (select top {0} ROW_NUMBER() over(order by id) as xxx,* from sqlpagetest )as temp where xxx>{1}", pageSize, pageIndex);
            DataTable tb = new DataTable();
            SqlDataAdapter dp = new SqlDataAdapter(sql, conn);
            dp.Fill(tb);
            return tb;
        }

前台代码

  <form id="form1" runat="server">
        <div>
            <table>
                <tr>
                    <td>ID</td>
                    <td>姓名</td>
                </tr>
                <asp:Repeater ID="Repeater1" runat="server">
                    <ItemTemplate>
                        <tr>
                            <td><%#Eval("id") %></td>
                            <td><%#Eval("name") %></td>
                        </tr>
                    </ItemTemplate>
                </asp:Repeater>
            </table>
            <%--显示pageSize--%>
            <asp:HiddenField ID="HiddenField1" runat="server" />
                   <%--显示pageIndex--%>
             <asp:HiddenField ID="HiddenField2" runat="server" />
            <asp:LinkButton ID="LinkButton1" OnClick="LinkButton1_Click" runat="server">上一页</asp:LinkButton>
             <asp:LinkButton ID="LinkButton2" OnClick="LinkButton2_Click" runat="server">下一页</asp:LinkButton>
        </div>
    </form>

后台代码

public int maxpage;
        public int nowpage;
        protected void Page_Load(object sender, EventArgs e)
        {

            if (!IsPostBack)
            {
                maxpage = 10;
                nowpage = 0;
                page(maxpage, nowpage);
                HiddenField1.Value = maxpage.ToString();
                HiddenField2.Value = nowpage.ToString();
            }
        }
        public void page(int maxpage, int nowpage)
        {
            Repeater1.DataSource = new dbhelper().PageBysql(maxpage, nowpage);
            Repeater1.DataBind();
        }
        //上一页
        protected void LinkButton1_Click(object sender, EventArgs e)
        {
            if (int.Parse(HiddenField2.Value) > 0)
            {
                maxpage =int.Parse(HiddenField1.Value)-10;
                nowpage = int.Parse(HiddenField2.Value)-10;
                page(maxpage, nowpage);
                HiddenField1.Value = maxpage.ToString();
                HiddenField2.Value = nowpage.ToString();
            }
            else
            {

            }
        }
        //下一页
        protected void LinkButton2_Click(object sender, EventArgs e)
        {
            
                maxpage +=(10+ int.Parse(HiddenField1.Value));
                nowpage += (10+int.Parse(HiddenField2.Value));
                page(maxpage, nowpage);
                HiddenField1.Value = maxpage.ToString();
                HiddenField2.Value = nowpage.ToString();
           
        }

积土而为山，积水而为海。 ——荀子

ASP.NET简单SQL分页的实现

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