ASP.. NET MVC应用程序从SQLite数据库读取数据
本文关键字:数据库 读取 数据 SQLite NET MVC 应用程序 ASP | 更新日期: 2023-09-27 18:10:44
新手问题:
我有一个SQLite数据库与一些随机的电影信息,我正在读取数据,并将数据添加到视图。但是,现在它正在遍历表,只将最后一条记录添加到视图中。我如何添加每条记录作为SQLiteDataReader是通过表而不是表中的最后一条记录?
这是我当前的控制器代码:
public ActionResult dbView()
{
string cs = "Data Source=" + Environment.CurrentDirectory + "''example.db";
using (SQLiteConnection con = new SQLiteConnection(cs))
{
con.Open();
string stm = "SELECT * FROM Movie";
using (SQLiteCommand cmd = new SQLiteCommand(stm, con))
{
using (SQLiteDataReader rdr = cmd.ExecuteReader())
{
while (rdr.Read())
{
ViewBag.movie = rdr["MovieId"];
ViewBag.title = rdr["title"];
ViewBag.rating = rdr["rating"];
ViewBag.image = rdr["image"];
}
}
}
var image = "data:image/png;base64," + Convert.ToBase64String(ViewBag.image);
ViewBag.image = image;
con.Close();
}
return View();
}
视图代码:
<div class="col-md-4">
<table style="width: 100%" border="1">
<tr>
<th>Title</th>
<th>Rating</th>
</tr>
<tr>
<td>@ViewBag.title</td>
<td>@ViewBag.rating</td>
</tr>
</table>
<img src="@ViewBag.image" style="width: 300px"/>
</div>
更新:这是我目前在哪里:
public List<Movie> Movies { get; set; }
public ActionResult dbView()
{
string cs = "Data Source=" + Environment.CurrentDirectory + "''example.db";
using (SQLiteConnection con = new SQLiteConnection(cs))
{
var listOfMovies = new List<Movie>();
con.Open();
string stm = "SELECT * FROM Movie";
using (SQLiteCommand cmd = new SQLiteCommand(stm, con))
{
using (SQLiteDataReader rdr = cmd.ExecuteReader())
{
while (rdr.Read())
{
listOfMovies.Add(new Movies
{
MovieID= int.Parse(reader["EmployeeId"].ToString()),
Title= reader["Title"].ToString(),
Rating= reader["Rating"].ToString(),
});
}
rdr.Close();
Movies = listOfMovies;
}
}
con.Close();
}
return View(Movies); // this says "Class name is not valid"
}
}
和我的模型:
public class Movie
{
Public int MovieID {get;set;}
Public String Title {get;set;}
Public int rating {get;set;}
Public Byte Image {get;set;}
}
添加到视图:
@foreach (var item in Movies) // this says "cannot resolve symbol Movies"
{
<tr>
<td>@ViewBag.title</td>
<td>@ViewBag.rating</td>
</tr>
}
我没有使用SQL lite的经验,但它应该具有与MS SQL Server相同的目的
使用我的一些代码作为一个例子修改为您的目的。
public List<Movie> Movies{ get; set; }
public void Connect()
{
string cs = "Data Source=" + Environment.CurrentDirectory + "''example.db";
using (var connection = new SQLiteConnection(cs))
{
var listOfMovies= new List<Movie>();
var stm = "SELECT * FROM Movie";
var command = new SQLiteCommand(stm , connection);
try
{
var reader = command.ExecuteReader();
while (reader.Read())
{
listOfMovies.Add(new Movie
{
MovieID= int.Parse(reader["EmployeeId"].ToString()),
Title= reader["Title"].ToString(),
Rating= reader["Rating"].ToString(),
//Do what ever you should be doing with the image.
});
}
reader.Close();
Movies = listOfMovies;
}
catch (Exception ex)
{
throw;
}
}
}
public class Movie
{
Public int MovieID {get;set;}
Public String Title {get;set;}
Public int rating {get;set;}
Public Byte Image {get;set;}
}
简单地将'Movies List'返回到视图(在模型中),尽量不要使用Viewbag属性来处理这种类型的事情。
和在CSHTML中:
<div class="col-md-4">
<table style="width: 100%" border="1">
<tr>
<th>Title</th>
<th>Rating</th>
</tr>
@foreach(var item in model.Movies)
{
<tr>
<td>item.title</td>
<td>item.rating</td>
//EDITED HERE FOR IMAGE
//This should work note that this code is untested.
<td><img src="item.imageFilePath" width="300px;"/></td>
</tr>
}
</table>
<img src="@ViewBag.image" style="width: 300px"/>
就像TinMan7757写的那样,但使用数据集适配器是更好的方法:
using (var sqlDataAdapter = new SqlDataAdapter(sqlCommand)){
using (var dataSet = new DataSet())
{
sqlDataAdapter.Fill(dataSet);
return dataSet.Tables[0].AsEnumerable().Select(row => new Movie
{
MovieID= row["MovieID"].ToString(),
Title= row["Title"].ToString(),
Rating= row["Rating"].ToString()
});
}
}