使用 JSON 将 jQuery 小部件保存到 SqlDatabase
本文关键字:保存 SqlDatabase 小部 JSON jQuery 使用 | 更新日期: 2023-09-27 18:32:11
我不久前创建了一个带有小部件的仪表板,现在我正在重新审视如何将每个用户的小部件保存到数据库中。我以为我走在正确的轨道上,但我对 JSON 很陌生,我无法完成我需要的东西。我已经对此进行了研究并尝试了多种方法,但到目前为止没有任何效果。这是我的代码。
创建要更新的项目的JavaScript
function updateWidgetData() {
var items = [];
$('.column').each(function () {
var columnId = $(this).attr('id');
$('.dragbox', this).each(function (i) {
var collapsed = 0;
if ($(this).find('.dragbox-content').css('display') == "none")
collapsed = 1;
//Create Item object for current panel
var item = {
id: $(this).attr('id'),
collapsed: collapsed,
order: i,
column: columnId
};
//Push item object into items array
items.push(item);
});
});
//Assign items array to sortorder JSON variable
var sortorder = { items: items };
现在我的目标是将要保存到数据库的排序顺序传递给数据库......但我有这个进行测试..
var testData = '{ "Column1": "test1", "Column2": "test2"}'
$.ajax ({
url: "/Handlers/SaveWidgets.ashx",
type: "POST",
contentType: "application/json; charset=uft-8",
dataType: "json",
data: testData,
success: function (response) {
alert("Passed json");
},
error: function (error) {
alert("Failed passing json.");
}
});
然后在我的处理程序中..
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "application/json";
string column1 = (string)context.Request.Form["Column1"];
string column2 = (string)context.Request.Form["Column2"];
using (SqlConnection connCao = new SqlConnection(ConfigurationManager.ConnectionStrings["dboCao"].ConnectionString))
{
using(SqlCommand cmdWidget = new SqlCommand("INSERT INTO TestTable (Column1, Column2) VALUES (@column1, @column2)", connCao))
{
cmdWidget.Parameters.AddWithValue("@column1", column1);
cmdWidget.Parameters.AddWithValue("@column2", column2);
connCao.Open();
cmdWidget.ExecuteNonQuery();
connCao.Close();
}
}
}
但我明白它期待@column1参数,以及从未提供过的@column2参数。很明显,我错过了如何做某事,我无法在谷歌机器上找到我缺少的东西。
我在这里使用了这个链接,但这并不能解释最大的,有些事情让我感到困惑。
我还找到了其他链接,但没有任何东西可以解释我想要完成的目标。任何帮助将不胜感激!
我将首先创建一个类来表示您发布到处理程序的数据。
using System;
using System.Runtime.Serialization;
[DataContract]
public class YourDataModel
{
public YourDataModel() { }
// When a property in your model doesn't
// match up exactly you can manually
// specify the name
[DataMember(Name = "Column1")]
public String Col1 { get; set; }
// If things match up exactly (including case)
// you don't need to manually map the Name
[DataMember]
public String Column2 { get; set; }
}
然后修改处理程序,从发布的 JSON 数据创建该类的实例。
using System;
using System.IO;
using System.Web;
using System.Runtime.Serialization.Json;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
public class SaveWidgets : IHttpHandler {
public void ProcessRequest (HttpContext context)
{
String json = String.Empty;
// you have sent JSON to the server
// read it into a string via the input stream
using (StreamReader rd = new StreamReader(context.Request.InputStream))
{
json = rd.ReadToEnd();
}
// create an instance of YourDataModel from the
// json sent to this handler
YourDataModel data = null;
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(YourDataModel));
using (MemoryStream ms = new MemoryStream())
{
byte[] utf8Bytes = Encoding.UTF8.GetBytes(json);
ms.Write(utf8Bytes, 0, utf8Bytes.Length);
ms.Position = 0;
data = serializer.ReadObject(ms) as YourDataModel;
}
// update the DB and
// send back a JSON response
int rowsUpdated = 0;
using (SqlConnection c = new SqlConnection(ConfigurationManager.ConnectionStrings["dboCao"].ConnectionString))
{
c.Open();
String sql = @"
INSERT INTO TestTable
(Column1, Column2)
VALUES
(@column1, @column2);";
using (SqlCommand cmd = new SqlCommand(sql, c))
{
cmd.Parameters.Add("@column1", SqlDbType.VarChar, 50).Value = data.Col1;
cmd.Parameters.Add("@column2", SqlDbType.VarChar, 50).Value = data.Column2;
rowsUpdated = cmd.ExecuteNonQuery();
}
}
context.Response.ContentType = "application/json";
context.Response.Write("{ '"rows_updated'": " + rowsUpdated + " }");
}
public bool IsReusable {
get { return false; }
}
}