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是否有一种普遍接受的模式将数据保存在handsontable中回数据库?

我正在使用 ajax 和 WCF 服务从我的数据库中提取数据以填充表。该服务正在返回一个对象列表,这些对象代表数据库表中的一行数据。

周转基金:

<ServiceContract(Namespace:="")>
<AspNetCompatibilityRequirements(RequirementsMode:=AspNetCompatibilityRequirementsMode.Allowed)>
Public Class TableService

    <OperationContract()>
    <WebGet(ResponseFormat:=WebMessageFormat.Json)>
    Public Function GetResource() As List(Of Resource)
        Dim conn = <some connection string>
        Dim sql = <some SQL>
        Dim dt = New DataTable("foo")

        Using da As New SqlDataAdapter(sql, conn)
            da.Fill(dt)
        End Using

        Return Objectify(dt)
    End Function

   Private Function Objectify(dt As DataTable) As List(Of Resource)
        Dim resourceTable = New List(Of Resource)

        For Each row As DataRow In dt.Rows
            resourceTable.Add(New Resource With {
                .ResourceAllocationID = row("ResourceAllocationID"),
                .ResourceName = row("ResourceName"),
                .AllocationPercent = row("AllocationPercent"),
                .Month = row("Month"),
                .Year = row("Year"),
                .Comments = row("Comments"),
                .ProjectID = row("ProjectID"),
                .ResourceUId = row("ResourceUId")})
        Next

        Return resourceTable
    End Function
End Class

Public Class Resource
    Public Property ResourceAllocationID As Integer
    Public Property ResourceName As String
    Public Property AllocationPercent As Integer
    Public Property Month As String
        Get
            Return _monthName
        End Get
        Set(value As String)
            Dim intMonth As Integer
            If Integer.TryParse(value, intMonth) Then
                If [Enum].IsDefined(GetType(MonthName), intMonth) Then
                    _monthName = CType(value, MonthName).ToString
                End If
            Else
                If [Enum].IsDefined(GetType(MonthName), value) Then
                    _monthName = value
                End If
            End If
        End Set
    End Property        
    Public Property Year As Integer
    Public Property Comments As String
    Public Property ProjectID As Integer
    Public Property ResourceUId As String

    Private _monthName As String

    Public Enum MonthName
        January = 1
        February = 2
        March = 3
        April = 4
        May = 5
        June = 6
        July = 7
        August = 8
        September = 9
        October = 10
        November = 11
        December = 12
    End Enum
End Class

Java脚本:

$("#container").handsontable({
    contextMenu: true,
    startRows: 1,
    minRows: 1,
    colHeaders: ['Year', 'Month', 'Name', '% Allocation', 'Comments'],
    colWidths: [52, 100, 150, 100, 200],
    columns: [
        { data: 'Year', type: 'numeric' },
        { data: 'Month' },
        { data: 'ResourceName' },
        { data: 'AllocationPercent', type: 'numeric' },
        { data: 'Comments' }
    ]
});

$.ajax({
    url: "TableService.svc/GetResource",
    type: "GET",
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function (data) {
        $("#container").handsontable(loadData, data.d)
    },
    error: function (error) {
        alert("Error: " + error);
    }
});

这很好地填满了桌子。我正在苦苦挣扎的是如何将更改保存回数据库。要求是在所有更改完成并点击更新按钮之前不要保存任何更改。

我知道我可以通过调用来获得一个包含表格中所有单元格的对象handsontable.getData()。我在想的是我需要将对象序列化为 Json,将其发送回我的服务,将其反序列化回对象列表,然后为列表中的每个对象更新数据库。我在正确的轨道上吗?如果是这样,我该如何实际实施它?

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2 回答 2

3

所以,我最终拼凑了一个解决方案来满足我的特定要求。

我首先需要获取一个表示 Handsontable 的所有单元格的 JSON 格式的字符串,以传递回我的 WCF 服务。该方法handsontable.getData()返回一个表示表中所有数据的对象。然后我用来JSON.stringify()将该对象转换为字符串。从那里我无法将该字符串传递给我的服务。我最终发现我必须对已经字符串化的对象进行字符串化,以便为我的服务创建正确的字符串参数,同时正确地转义对象中的引号。

$("#btnUpdate").click(function () {
    var tableData = JSON.stringify(handsontable.getData());
    var input = JSON.stringify({ "input": tableData });

    $.ajax({
        type: 'POST',
        url: "TableService.svc/SaveResource",
        data: input,
        contentType: "application/json; charset=utf-8",
        dataType: 'json',
        success: function (res) {
            if (res.result === 'ok') {
                console.text('Data saved');
            }
        },
        error: function (xhr) {
            alert(xhr.responseText);
        }
    });
    $("btnUpdate").blur();
});

现在我的表数据返回服务器端,我需要将 JSON 解析回对象列表。我最终使用JSON.NET来完成这项工作。获得对象列表后,我将每个列表项作为一行添加到新的行中DataTable,我能够在该行上运行更新数据库所需的 SQL。

<OperationContract()>
<WebInvoke(Method:="POST", BodyStyle:=WebMessageBodyStyle.WrappedRequest, ResponseFormat:=WebMessageFormat.Json)>
Public Function SaveResource(ByVal input As String) As String
    Dim resources As List(Of Resource) = Json.JsonConvert.DeserializeObject(Of List(Of Resource))(input)
    UpdateDB(resources)
    Return "ok"
End Function

Private Sub UpdateDB(resources As List(Of Resource))
    Dim dt As New DataTable
    Dim conn = <some connection string>
    Dim sql = <some SQL>
    Using da As New SqlDataAdapter(sql, conn)
        da.FillSchema(dt, SchemaType.Source)
        For Each resourceItem In resources
            Dim row As DataRow = dt.NewRow()
            Dim month As Resource.MonthName
            row("ResourceAllocationID") = resourceItem.ResourceAllocationID
            row("ResourceName") = resourceItem.ResourceName
            row("AllocationPercent") = resourceItem.AllocationPercent
            row("Month") = [Enum].TryParse(resourceItem.Month, month)
            row("Year") = resourceItem.Year
            row("Comments") = resourceItem.Comments
            row("ProjectID") = resourceItem.ProjectID
            row("ResourceUId") = resourceItem.ResourceUId
            dt.Rows.Add(row)
        Next
    End Using
    *<run the appropriate SQL on each row of dt to update the database>*
End Sub
于 2013-05-14T02:19:09.927 回答
2

有两种方法可以解决这个问题:

  1. 以小的编辑收集数据,将它们保存在浏览器本地,当用户点击保存时,您将编辑的数据块发送回数据库。

  2. 保留数据表的本地版本,对其进行编辑,当用户点击保存时,您将整个表发回并将其保存到数据库中。

我会使用方法 1,因为它会减少流失,并且不会意外覆盖。您需要使用onChange 回调。我认为您需要有一个隐藏列,其中包含您正在编辑的行的 ID。

# coffeescript 
onChangeHandler = -> 
  rowChange = rowID: theDataArray[arguments[0]], rowCol: arguments[1], newVal: arguments[3], dateTime: new Date()
  window.MyNamespace.edits.push(rowChange)

tableDiv.handsontable
  ... 
  onChange: onChangeHandler 

$('#save').click( ->
 # save data back to the database
)
于 2013-05-06T17:52:47.673 回答