Question

基本上，对于学校项目，我们必须使用冒泡排序对数据库进行排序（我知道效率非常低）。到目前为止，我通过从数据库创建一个数组然后对该数组进行排序来实现这一目标。我现在的问题是找出一种方法将这个已排序的数组放回数据库供用户查看。

这是我到目前为止的代码......

    Dim dt As DataTable = Me.Patient_ListingDataSet.Tables(0)

    '------  Creating Name Array  ------'
    listName.DataSource = Me.PatientListingBindingSource
    listName.DisplayMember = "pName"
    Dim Length As Integer = Me.listName.Items.Count - 1

    i = 0
    ReDim arrName(Length)

    For Each row As DataRow In dt.Rows
        arrName(i) = $"{(row("pName"))}"
        i += 1
    Next


    '-----  Bubble sorting Names (Z - A) -----'

        Dim Length As Integer = Me.listName.Items.Count - 1
        Dim swapped As Boolean = True
        Dim bubbleTempName As String

        While swapped = True
            swapped = False
            For Pass = 1 To Length
                For i = 0 To Length - 1
                    If arrName(i) < arrName(i + 1) Then
                        bubbleTempName = arrName(i)
                        arrName(i) = arrName(i + 1)
                        arrName(i + 1) = bubbleTempName
                        swapped = True
                    End If
                Next i
            Next Pass
        End While

我只是无法弄清楚如何将现在排序的数组返回到数据库中。提前致谢。：）

Answer 1

我找到了答案。我不得不使用for循环，然后添加一个新行，直到所有值都被添加进去。为了获得所有列，我必须为每个列创建一个数组，对每个列进行排序，然后最后添加已排序的数组再次找到合适的专栏。

以下是所有代码： Dim dt As DataTable = Me.Patient_ListingDataSet.Tables（0）'定义使用的数据表

    '------  Creating Name Array  ------'

    listName.DataSource = Me.PatientListingBindingSource
    listName.DisplayMember = "pName"

    Dim Length As Integer = Me.listName.Items.Count - 1

    i = 0
    ReDim arrName(Length)

    For Each row As DataRow In dt.Rows
        arrName(i) = $"{(row("pName"))}"
        i += 1
    Next

    '------  Creating Age Array  ------'

    listAge.DataSource = Me.PatientListingBindingSource
    listAge.DisplayMember = "pAge"

    i = 0
    ReDim arrAge(Length)

    For Each row As DataRow In dt.Rows
        arrAge(i) = $"{(row("pAge"))}"
        i += 1
    Next

    '------  Creating Weight Array  ------'

    listWeight.DataSource = Me.PatientListingBindingSource
    listWeight.DisplayMember = "pWeight"

    i = 0
    ReDim arrWeight(Length)

    For Each row As DataRow In dt.Rows
        arrWeight(i) = $"{(row("pWeight"))}"
        i += 1
    Next

    '------  Creating Height Array  ------'

    listHeight.DataSource = Me.PatientListingBindingSource
    listHeight.DisplayMember = "pHeight"

    i = 0
    ReDim arrHeight(Length)

    For Each row As DataRow In dt.Rows
        arrHeight(i) = $"{(row("pHeight"))}"
        i += 1
    Next

    '------  Creating BMI Array  ------'

    listBMI.DataSource = Me.PatientListingBindingSource
    listBMI.DisplayMember = "pBMI"

    i = 0
    ReDim arrBMI(Length)

    For Each row As DataRow In dt.Rows
        arrBMI(i) = $"{(row("BMI"))}"
        i += 1
    Next

    '------  Creating BMI Array  ------'

    listBMIClass.DataSource = Me.PatientListingBindingSource
    listBMIClass.DisplayMember = "BMIClass"

    i = 0
    ReDim arrBMIClass(Length)

    For Each row As DataRow In dt.Rows
        arrBMIClass(i) = $"{(row("BMIClass"))}"
        i += 1
    Next

    '-----  Bubble sorting by Age (High - Low) -----'

    'If the current index in Name array is smaller than the next index, the index will swap. Largest index will 'bubble' to the top
    While swapped = True
        swapped = False
        For Pass = 1 To Length
            For i = 0 To Length - 1
                If arrName(i) > arrName(i + 1) Then

                    'Swapping the same index in the Name array
                    TempName = arrName(i)
                    arrName(i) = arrName(i + 1)
                    arrName(i + 1) = TempName

                    'Swapping the same index in the Age array
                    TempAge = arrAge(i)
                    arrAge(i) = arrAge(i + 1)
                    arrAge(i + 1) = TempAge

                    'Swapping the same index in the Weight array
                    TempWeight = arrWeight(i)
                    arrWeight(i) = arrWeight(i + 1)
                    arrWeight(i + 1) = TempWeight

                    'Swapping the same index in the Height array
                    TempHeight = arrHeight(i)
                    arrHeight(i) = arrHeight(i + 1)
                    arrHeight(i + 1) = TempHeight

                    'Swapping the same index in the BMI array
                    TempBMI = arrBMI(i)
                    arrBMI(i) = arrBMI(i + 1)
                    arrBMI(i + 1) = TempBMI

                    'Swapping the same index in the BMIClass array
                    TempBMIClass = arrBMIClass(i)
                    arrBMIClass(i) = arrBMIClass(i + 1)
                    arrBMIClass(i + 1) = TempBMIClass

                    swapped = True
                End If
            Next i
        Next Pass
    End While

    Patient_ListingDataSet.Tables(0).Rows.Clear() 'Clears table for now sorted data

    For Me.i = 0 To Length 'event occurs until the all indexes are added

        'Creats a new row for each index being addad
        Dim newRow As Patient_ListingDataSet.Patient_ListingRow
        newRow = Me.Patient_ListingDataSet.Patient_Listing.NewRow()

        'ensures arrays are added into corresponing columns of datatable
        newRow.pName = arrName(i)
        newRow.pAge = arrAge(i)
        newRow.pWeight = arrWeight(i)
        newRow.pHeight = arrHeight(i)
        newRow.BMI = arrBMI(i)
        newRow.BMIClass = arrBMIClass(i)

        'the arrays are added to the created row
        Me.Patient_ListingDataSet.Patient_Listing.Rows.Add(newRow)
    Next
End Sub

将多个数据从数组传输到数据库的不同行

1 个答案: