Question

我刚从C＃开始，我还在学习这些东西。我尝试使用从选择框填充的多个WHERE子句显示数据。我发现if（Request.QueryString [“...”]。IsEmpty（））

的问题

这仅适用于第一个选择框。如果选中此框，则省略所有下一个框选择。如果未选择第一个框，则不显示任何数据。我怎么解决这个问题？

这是我的代码：

var db = Database.Open("Eason");
var Warranty = Request["Warranty"];
var EbookM = Request["EbookM"];    

if (IsPost) 
{
    Warranty = Request["Warranty"];
    if (Warranty.IsEmpty()) {
       selectQ = "SELECT * FROM E_Reader";}

    Warranty = Request["EbookM"];
    if (EbookM.IsEmpty()) {
       selectQ = "SELECT * FROM E_Reader";}


    if(Request.QueryString["Warranty"].IsEmpty() ) {
    selectQ = "SELECT * FROM E_Reader";
    searchTerm1 = Request.QueryString["Warranty"];
    searchTerm2 =Request.QueryString["EbookM"];

}

var selectedData1 = db.Query(selectQ, searchTerm1, searchTerm2);
var grid = new WebGrid(source: selectedData1, defaultSort: "Ebook_Model", rowsPerPage: 10);

Answer 1

排序:)。应该有WHERE ..... AND .....而不是OR - 刚才是

最终代码是：

var db = Database.Open("Eason");
var sqlQ = "SELECT * FROM E_Reader WHERE In_Warranty LIKE @0 AND Ebook_Made LIKE @1";
var Warranty = "%" + Request["Warranty"] + "%";
var Made = "%" + Request["Made"] + "%";

var selectedData = db.Query(sqlQ, Warranty, Made);

var grid = new WebGrid(source: selectedData, defaultSort: "Ebook_Made");

使用多个选择框在WebMatrix中显示来自SQL db的数据

1 个答案: