组合查询就是根据条件取出某些数据并展示出来。
前台代码
<html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title>组合查询</title> <style type="text/css"> .UF_div { width: 1200px; margin: 0 auto; background-color: #eeeeee; } .User_div { display: inline-block; background-color: #ffccff; border-color: blue; border-width: 5px; margin: 5px 0; margin-left: 5px; border-style: solid; height: 210px; width: 220px; line-height:30px; } .User_div:hover { background-color: palevioletred; } .div_select{ margin-left:76px; /*margin-right:180px;*/ width:1000px; height:100px; line-height:50px; } </style> </head> <body> <form id="form1" runat="server"> <div class="div_select"> 名称：<asp:TextBox ID="txt_name" runat="server"></asp:TextBox> 地区：<asp:DropDownList ID="ddl_partys" runat="server"></asp:DropDownList> 位置：<asp:DropDownList ID="ddl_lanes" runat="server"></asp:DropDownList> <asp:Button ID="btn_select" runat="server" Text="查询" /> <br /> <asp:Label ID="Label1" runat="server" Text="查询语句"></asp:Label> </div> <div class="UF_div"> <asp:Repeater ID="UserData_all" runat="server"> <ItemTemplate> <div class="User_div"> 编 号：<%# Eval("Ucode")%><br /> 用户名：<%# Eval("UserName")%><br /> 密 码：<%# Eval("PassWord")%><br /> 昵 称：<%# Eval("NickName")%><br /> 性 别：<%# Eval("SexStr")%><br /> 地 区：<%# Eval("PartyName")%><br /> 位 置：<%# Eval("LaneName")%><br /> </div> </ItemTemplate> </asp:Repeater> <div style="clear: both"></div> </div> </form> </body> </html>
后台代码
protected void Page_Load(object sender, EventArgs e) { //查询按钮 btn_select.Click += Btn_select_Click; //如果首次登录 加载数据 if (!IsPostBack) { //数据绑定 UserData_all.DataSource = new UsersData().SelectAll(); UserData_all.DataBind(); //地区列表绑定 ddl_partys.DataSource = new PartysData().SelectAll(); ddl_partys.DataValueField = "PartyCode"; ddl_partys.DataTextField = "PartyName"; ddl_partys.DataBind(); ddl_partys.Items.Add(new ListItem("全部", "all")); ddl_partys.Items.FindByValue("all").Selected = true; //位置列表绑定 ddl_lanes.DataSource = new LanesData().SelectAll(); ddl_lanes.DataValueField = "LaneCode"; ddl_lanes.DataTextField = "LaneName"; ddl_lanes.DataBind(); ddl_lanes.Items.Add(new ListItem("全部", "all")); ddl_lanes.Items.FindByValue("all").Selected = true; } } //查询按钮点击事件 private void Btn_select_Click(object sender, EventArgs e) { //拼接语句 string sql = "select * from Users"; Hashtable hs = new Hashtable(); int count = 0; if (txt_name.Text.Trim().Length>0) { sql += " where NickName like @a"; hs.Add("@a", "%"+txt_name.Text.Trim()+"%"); count++; } string x = ddl_partys.SelectedValue; if (x != "all") { if (count == 0) { sql += " where Party = '" + x + "'"; } else { sql+= " and Party = '" + x + "'"; } count++; } string y = ddl_lanes.SelectedValue; if (y != "all") { if (count == 0) { sql += " where Lane = '" + y+"'"; } else { sql += " and Lane = '" + y + "'"; } count++; } //调用方法 通过sql语句查询 接收返回值 并绑定数据 Label1.Text = sql; List<Users> ul = new UsersData().SelectThe(sql, hs); UserData_all.DataSource = ul; UserData_all.DataBind(); } }
效果图
