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January 25, 2016 18:08
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Assignment 2 ITC172
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| <?xml version="1.0"?> | |
| <!-- | |
| For more information on how to configure your ASP.NET application, please visit | |
| http://go.microsoft.com/fwlink/?LinkId=169433 | |
| --> | |
| <configuration> | |
| <system.web> | |
| <compilation debug="true" targetFramework="4.5" /> | |
| <httpRuntime targetFramework="4.5" /> | |
| </system.web> | |
| <!--here is the connection string to the database. | |
| In your case instead of localhost use .\sqlexpress--> | |
| <connectionStrings> | |
| <add name="BookReviewDbConnectionString" | |
| connectionString="Data Source=.\sqlexpress;initial catalog=BookReviewDb; integrated security=true"/> | |
| </connectionStrings> | |
| </configuration> |
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| <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> | |
| <!DOCTYPE html> | |
| <html xmlns="http://www.w3.org/1999/xhtml"> | |
| <head runat="server"> | |
| <title>Book Review</title> | |
| </head> | |
| <body> | |
| <form id="form1" runat="server"> | |
| <div> | |
| <h1>Authors</h1> | |
| <hr /> | |
| <p>Select an author from the dropdown list to view books from the author.</p> | |
| <asp:DropDownList ID="AuthorDropDownList" runat="server" AutoPostBack="True" OnSelectedIndexChanged="AuthorDropDownList_SelectedIndexChanged" CssClass="StyleSheet"></asp:DropDownList> | |
| <asp:GridView ID="BookGridView" runat="server"></asp:GridView> | |
| <asp:Label ID="ErrorLabel" runat="server" Text=""></asp:Label> | |
| </div> | |
| </form> | |
| <link href="StyleSheet.css" rel="stylesheet" type="text/css" /> | |
| </body> | |
| </html> |
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| using System; | |
| using System.Collections.Generic; | |
| using System.Linq; | |
| using System.Web; | |
| using System.Web.UI; | |
| using System.Web.UI.WebControls; | |
| using System.Data; | |
| public partial class _Default : System.Web.UI.Page | |
| { | |
| GrantsAndServices gs = new GrantsAndServices(); | |
| protected void Page_Load(object sender, EventArgs e) | |
| { | |
| if (!IsPostBack) | |
| FillDropDownList(); | |
| } | |
| protected void AuthorDropDownList_SelectedIndexChanged(object sender, EventArgs e) | |
| { | |
| FillGridView(); | |
| } | |
| protected void FillDropDownList() | |
| { | |
| DataTable table = null; | |
| try | |
| { | |
| table = gs.GetAuthors(); | |
| } | |
| catch (Exception ex) | |
| { | |
| ErrorLabel.Text = ex.Message; | |
| } | |
| AuthorDropDownList.DataSource = table; | |
| AuthorDropDownList.DataTextField = "AuthorName"; | |
| AuthorDropDownList.DataValueField = "AuthorKey"; | |
| AuthorDropDownList.DataBind(); | |
| } | |
| protected void FillGridView() | |
| { | |
| int AuthorKey = int.Parse(AuthorDropDownList.SelectedValue.ToString()); | |
| DataTable tbl = null; | |
| try | |
| { | |
| tbl = gs.GetAuthorBooks(AuthorKey); | |
| } | |
| catch (Exception ex) | |
| { | |
| ErrorLabel.Text = ex.Message; | |
| } | |
| BookGridView.DataSource = tbl; | |
| BookGridView.DataBind(); | |
| } | |
| } |
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| using System; | |
| using System.Collections.Generic; | |
| using System.Linq; | |
| using System.Web; | |
| //add these three libraries | |
| using System.Data; | |
| using System.Data.SqlClient; | |
| using System.Configuration; | |
| public class GrantsAndServices | |
| { | |
| //create connection object | |
| SqlConnection connect; | |
| public GrantsAndServices() | |
| { | |
| //initialize connection object | |
| //the connection string is in the web config | |
| //The config manager lets the code | |
| //access the web config file | |
| connect = new SqlConnection(ConfigurationManager. | |
| ConnectionStrings["BookReviewDbConnectionString"].ToString()); | |
| } | |
| public DataTable GetAuthors() | |
| { | |
| //set up the sql string | |
| string sql = "Select AuthorKey, AuthorName from Author"; | |
| DataTable tbl;//declare the table | |
| //initialize the command passing it | |
| //the sql command and the connection | |
| SqlCommand cmd = new SqlCommand(sql, connect); | |
| try | |
| { | |
| //we call the ProcessQuery method | |
| //try catch in case there is an error | |
| tbl = ProcessQuery(cmd); | |
| } | |
| catch(Exception ex) | |
| { | |
| //throw it back to the form | |
| throw ex; | |
| } | |
| return tbl; | |
| } | |
| public DataTable GetAuthorBooks(int AuthorKey) | |
| { | |
| string sql = "SELECT BookTitle, BookEntryDate, BookISBN FROM Book INNER JOIN AuthorBook ON Book.BookKey=AuthorBook.bookkey WHERE AuthorKey=@AuthorKey"; | |
| SqlCommand cmd = new SqlCommand(sql, connect); | |
| cmd.Parameters.Add("@AuthorKey", AuthorKey); | |
| DataTable tbl; | |
| try | |
| { | |
| tbl = ProcessQuery(cmd); | |
| } | |
| catch (Exception ex) | |
| { | |
| throw ex; | |
| } | |
| return tbl; | |
| } | |
| private DataTable ProcessQuery(SqlCommand cmd) | |
| { | |
| //This method processes the queries | |
| //since the code would be identical in | |
| //both queries, I refractored it into | |
| //its own method. No need to repeat more | |
| //than is necessary | |
| DataTable table = new DataTable(); | |
| SqlDataReader reader; | |
| try | |
| { | |
| connect.Open(); | |
| reader = cmd.ExecuteReader(); | |
| table.Load(reader); | |
| connect.Close(); | |
| } | |
| catch (Exception ex) | |
| { | |
| throw ex; | |
| } | |
| return table; | |
| } | |
| } |
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