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  • 【2017-5-25】WebForm 条件查询 + 分页 组合

    实体类

    public int ids { get; set; }
        public string code { get; set; }
        public string name { get; set; }
        public decimal oil { get; set; }
        public decimal price { get; set; }

    封装类

    SqlConnection conn = null;
        SqlCommand cmd = null;
    
        public carData()
        {
            conn = new SqlConnection("server=.;database=One;user=sa;pwd=123");
            cmd = conn.CreateCommand();
        }
    
        //查询全部
        public List<car> SelectAll()
        {
            List<car> clist = new List<car>();
            cmd.CommandText = "select * from car";
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            if (dr.HasRows)
            {
                while (dr.Read())
                {
                    car c = new car();
                    c.ids = Convert.ToInt32(dr["ids"]);
                    c.code = dr["code"].ToString();
                    c.name = dr["name"].ToString();
                    c.oil = Convert.ToDecimal(dr["oil"]);
                    c.price = Convert.ToDecimal(dr["price"]);
                    clist.Add(c);
                }
            }
            conn.Close();
            return clist;
        }
    
    
        //分页查询
        public List<car> SelectAll(int count, int number)
        {
            List<car> clist = new List<car>();
            cmd.CommandText = "select top " + count + " * from car where ids not in(select top " + (count * (number - 1)) + " ids from car)";
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            if (dr.HasRows)
            {
                while (dr.Read())
                {
                    car c = new car();
                    c.ids = Convert.ToInt32(dr["ids"]);
                    c.code = dr["code"].ToString();
                    c.name = dr["name"].ToString();
                    c.oil = Convert.ToDecimal(dr["oil"]);
                    c.price = Convert.ToDecimal(dr["price"]);
                    clist.Add(c);
                }
            }
            conn.Close();
            return clist;
        }
    
    
        //查询数据条数
        public int SelectCount()
        {
            int a = 0;
            cmd.CommandText = "select count(*) from car";
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            dr.Read();
            a = Convert.ToInt32(dr[0]);
            conn.Close();
            return a;
        }
        //查询数据条数传值
        public int SelectCount(string tsql, Hashtable hs)
        {
            int a = 0;
            cmd.CommandText = tsql;
            cmd.Parameters.Clear();
            foreach (string h in hs.Keys)
            {
                cmd.Parameters.AddWithValue(h, hs[h]);
            }
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            dr.Read();
            a = Convert.ToInt32(dr[0]);
            conn.Close();
            return a;
        }
    
    
        //条件查询
        public List<car> SelectAll(string tsql, Hashtable hs)
        {
            List<car> clist = new List<car>();
            cmd.CommandText = tsql;
            cmd.Parameters.Clear();
            foreach (string h in hs.Keys)
            {
                cmd.Parameters.AddWithValue(h, hs[h]);
            }
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            if (dr.HasRows)
            {
                while (dr.Read())
                {
                    car c = new car();
                    c.ids = Convert.ToInt32(dr["ids"]);
                    c.code = dr["code"].ToString();
                    c.name = dr["name"].ToString();
                    c.oil = Convert.ToDecimal(dr["oil"]);
                    c.price = Convert.ToDecimal(dr["price"]);
                    clist.Add(c);
                }
            }
            conn.Close();
            return clist;
        }

    前端

    名称:<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
            油耗:<asp:DropDownList ID="DropDownList2" runat="server">
                <asp:ListItem Text="小于" Value="<"></asp:ListItem>
                <asp:ListItem Text="小于等于" Value="<="></asp:ListItem>
                <asp:ListItem Text="等于" Value="="></asp:ListItem>
                <asp:ListItem Text="大于等于" Value=">="></asp:ListItem>
                <asp:ListItem Text="大于" Value=">"></asp:ListItem>
            </asp:DropDownList>
            <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
            价格:<asp:DropDownList ID="DropDownList3" runat="server">
                <asp:ListItem text="任意金额" Value="null"></asp:ListItem>
                <asp:ListItem text="小于30万" Value="price < 30"></asp:ListItem>
                <asp:ListItem text="大于30万小于40万" Value="price > 30 and price < 40"></asp:ListItem>
                <asp:ListItem text="大于40万小于50万" Value="price > 40 and price < 50"></asp:ListItem>
                <asp:ListItem text="大于50万" Value="price > 40"></asp:ListItem>
               </asp:DropDownList>
            &nbsp;&nbsp;&nbsp;&nbsp;
    
            <asp:Button ID="Button6" runat="server" Text="查询" />
            <br />
            <%--显示拼接的字符串--%>
            <asp:Label ID="Label3" runat="server" Text="Label"></asp:Label>
            <br />
            <br />
            <br />
            <br />
            <br />
            <br />
    
    
    
    
    
    
        <table style=" 100%; background-color: #0094ff; text-align: center;">
                <tr>
                    <td>Ids</td>
                    <td>编号</td>
                    <td>名称</td>
                    <td>油耗</td>
                    <td>价格</td>
                </tr>
    
    
                <asp:Repeater ID="Repeater1" runat="server">
                    <ItemTemplate>
                        <tr style="background-color: #fff;">
                            <td><%#Eval("ids") %></td>
                            <td><%#Eval("code") %></td>
                            <td><%#Eval("name") %></td>
                            <td><%#Eval("oil") %></td>
                            <td><%#Eval("price") %></td>
                        </tr>
                    </ItemTemplate>
                </asp:Repeater>
            </table>
            <br />
    
    
            当前第【<asp:Label ID="Label1" runat="server" Text="1"></asp:Label>】页&nbsp;&nbsp;&nbsp;&nbsp;
            共【<asp:Label ID="Label2" runat="server" Text="1"></asp:Label>】页&nbsp;&nbsp;&nbsp;&nbsp;
            <asp:Button ID="Button1" runat="server" Text="首页" />&nbsp;&nbsp;&nbsp;&nbsp;
            <asp:Button ID="Button2" runat="server" Text="上一页" />&nbsp;&nbsp;&nbsp;&nbsp;
            <asp:Button ID="Button3" runat="server" Text="下一页" />&nbsp;&nbsp;&nbsp;&nbsp;
            <asp:Button ID="Button4" runat="server" Text="尾页" />&nbsp;&nbsp;&nbsp;&nbsp;
            <asp:DropDownList ID="DropDownList1" runat="server"></asp:DropDownList><asp:Button ID="Button5" runat="server" Text="跳转" />

    后台

    int count = 5;//每页显示条数
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                Repeater1.DataSource = new carData().SelectAll(count, 1);
                Repeater1.DataBind();
                Label2.Text = MaxPageNumber().ToString();
                for (int i = 1; i <= MaxPageNumber(); i++)
                {
                    ListItem li = new ListItem(i.ToString(), i.ToString());
                    DropDownList1.Items.Add(li);
                }
            }
            //改变按钮是否可用状态
            if (Label1.Text == "1")
            {
                Button1.Enabled = false;
                Button2.Enabled = false;
            }
            if (Label1.Text != "1")
            {
                Button1.Enabled = true;
                Button2.Enabled = true;
            }
            if (Label1.Text == MaxPageNumber().ToString())
            {
                Button3.Enabled = false;
                Button4.Enabled = false;
            }
            if (Label1.Text != MaxPageNumber().ToString())
            {
                Button3.Enabled = true;
                Button4.Enabled = true;
            }
            //按钮点击事件
            Button4.Click += Button4_Click;
            Button3.Click += Button3_Click;
            Button2.Click += Button2_Click;
            Button1.Click += Button1_Click;
            Button5.Click += Button5_Click;
    
            Button6.Click += Button6_Click;
        }
    
        void Button6_Click(object sender, EventArgs e)
        {
    
            Repeater1.DataSource = EndData(1);
            Repeater1.DataBind();
            Label1.Text = "1";
            Label2.Text = MaxPageNumber2().ToString();
    
    
    
    
    
        }
    
        //跳转
        void Button5_Click(object sender, EventArgs e)
        {
            int a = Convert.ToInt32(DropDownList1.SelectedValue);
            //将下一页数据绑定到
            Repeater1.DataSource = EndData(a);
            Repeater1.DataBind();
    
            //将当前显示的页数改变到页面上去
            Label1.Text = a.ToString();
            //改变按钮是否可用状态
            if (Label1.Text == "1")
            {
                Button1.Enabled = false;
                Button2.Enabled = false;
            }
            if (Label1.Text != "1")
            {
                Button1.Enabled = true;
                Button2.Enabled = true;
            }
            if (Label1.Text == MaxPageNumber2().ToString())
            {
                Button3.Enabled = false;
                Button4.Enabled = false;
            }
            if (Label1.Text != MaxPageNumber2().ToString())
            {
                Button3.Enabled = true;
                Button4.Enabled = true;
            }
        }
    
        //首页
        void Button1_Click(object sender, EventArgs e)
        {
            //将下一页数据绑定
            Repeater1.DataSource = EndData(1);
            Repeater1.DataBind();
    
            //将当前显示的页数改变
            Label1.Text = "1";
            //改变按钮是否可用状态
            if (Label1.Text == "1")
            {
                Button1.Enabled = false;
                Button2.Enabled = false;
            }
            else
            {
                Button1.Enabled = true;
                Button2.Enabled = true;
            }
        }
    
        //上一页
        void Button2_Click(object sender, EventArgs e)
        {
            //获取当前页数,计算上一页页数
            int NextNumber = Convert.ToInt32(Label1.Text) - 1;
            if (NextNumber < 1)
            { return; }
            //将上一页数据绑定
            Repeater1.DataSource = EndData(NextNumber);
            Repeater1.DataBind();
    
            //将当前显示的页数改变
            Label1.Text = NextNumber.ToString();
            //改变按钮是否可用状态
            if (Label1.Text == "1")
            {
                Button1.Enabled = false;
                Button2.Enabled = false;
            }
            else
            {
                Button1.Enabled = true;
                Button2.Enabled = true;
            }
            if (Label1.Text == MaxPageNumber2().ToString())
            {
                Button3.Enabled = false;
                Button4.Enabled = false;
            }
            else
            {
                Button3.Enabled = true;
                Button4.Enabled = true;
            }
        }
    
        //下一页
        void Button3_Click(object sender, EventArgs e)
        {
            //获取当前页数,计算下一页页数
            int NextNumber = Convert.ToInt32(Label1.Text) + 1;
            if (NextNumber > MaxPageNumber2())
            { return; }
            //将下一页数据绑定
            Repeater1.DataSource = EndData(NextNumber);
            Repeater1.DataBind();
    
            //将当前显示的页数改变
            Label1.Text = NextNumber.ToString();
            //改变按钮是否可用状态
            if (Label1.Text == MaxPageNumber2().ToString())
            {
                Button3.Enabled = false;
                Button4.Enabled = false;
            }
            else
            {
                Button3.Enabled = true;
                Button4.Enabled = true;
            }
            if (Label1.Text == "1")
            {
                Button1.Enabled = false;
                Button2.Enabled = false;
            }
            else
            {
                Button1.Enabled = true;
                Button2.Enabled = true;
            }
        }
    
        //尾页
        void Button4_Click(object sender, EventArgs e)
        {
            //将下一页数据绑定
            Repeater1.DataSource = EndData(MaxPageNumber2());
            Repeater1.DataBind();
    
            //将当前显示的页数改变
            Label1.Text = MaxPageNumber2().ToString();
            //改变按钮是否可用状态
            if (Label1.Text == "1")
            {
                Button1.Enabled = false;
                Button2.Enabled = false;
            }
            else
            {
                Button1.Enabled = true;
                Button2.Enabled = true;
            }
            if (Label1.Text == MaxPageNumber2().ToString())
            {
                Button3.Enabled = false;
                Button4.Enabled = false;
            }
            else
            {
                Button3.Enabled = true;
                Button4.Enabled = true;
            }
        }
    
    
    
    
        //取最大页数
        public int MaxPageNumber()
        {
            int a = 0;
            int maxcount = new carData().SelectCount();
            decimal d = Convert.ToDecimal(maxcount) / count;
            a = Convert.ToInt32(Math.Ceiling(d));
            return a;
        }
    
    
        //条件查询分页最后数据
        public List<car> EndData(int n)
        {
            int a = 0;
            Hashtable hs = new Hashtable();
            string tsql = "select top " + count + " * from car ";
            string sql1 = "";
    
            if (TextBox1.Text.Trim().Length > 0)
            {
                sql1 += "where name like @a ";
                hs.Add("@a", "%" + TextBox1.Text + "%");
                a++;
            }
    
            if (TextBox2.Text.Trim().Length > 0)
            {
                if (a > 0)
                {
                    sql1 += "and oil " + DropDownList2.SelectedValue + " @b ";
                }
                else
                {
                    sql1 += "where oil " + DropDownList2.SelectedValue + " @b ";
                }
                hs.Add("@b", TextBox2.Text);
                a++;
            }
    
            if (DropDownList3.SelectedValue != "null")
            {
                if (a > 0)
                {
                    sql1 += "and " + DropDownList3.SelectedValue;
                }
                else
                {
                    sql1 += "where " + DropDownList3.SelectedValue;
                }
                a++;
            }
            tsql += sql1;
            if (a > 0)
            {
                tsql += "and ids not in (select top " + count * (n - 1) + " ids from car " + sql1 + ")";
            }
            else
            {
                tsql += "where ids not in (select top " + count * (n - 1) + " ids from car " + sql1 + ")";
            }
    
    
    
            Label3.Text = tsql;
    
    
            List<car> clist = new carData().SelectAll(tsql, hs);
            return clist;
        }
    
    
    
        public int MaxPageNumber2()
        {
            int end = 0;
            int a = 0;
            Hashtable hs = new Hashtable();
            string tsql = "select count(*) from car ";
            string sql1 = "";
    
            if (TextBox1.Text.Trim().Length > 0)
            {
                sql1 += "where name like @a ";
                hs.Add("@a", "%" + TextBox1.Text + "%");
                a++;
            }
    
            if (TextBox2.Text.Trim().Length > 0)
            {
                if (a > 0)
                {
                    sql1 += "and oil " + DropDownList2.SelectedValue + " @b ";
                }
                else
                {
                    sql1 += "where oil " + DropDownList2.SelectedValue + " @b ";
                }
                hs.Add("@b", TextBox2.Text);
                a++;
            }
    
            if (DropDownList3.SelectedValue != "null")
            {
                if (a > 0)
                {
                    sql1 += "and " + DropDownList3.SelectedValue;
                }
                else
                {
                    sql1 += "where " + DropDownList3.SelectedValue;
                }
                a++;
            }
            tsql += sql1;
    
            int aaa = new carData().SelectCount(tsql, hs);
    
            end = Convert.ToInt32(Math.Ceiling(Convert.ToDecimal(aaa) / count));
    
    
    
            return end;
        }
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  • 原文地址:https://www.cnblogs.com/hanqi0216/p/6904495.html
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