Question

有谁能告诉我如何在shell变量中键入反引号？

我正在变量中构建SQL查询。该查询的列名也是一个变量，我需要将它放在反引号之间（它必须是反引号，而不是＆＃39;或者＆＃34;）。

示例：

SQLQUERY="select `${columnname}` from table"

谢谢！

Answer 1

在包含反向标记的部分周围使用单引号，或使用反斜杠转义反向标记：

Imports Microsoft.Office.Interop.Excel

Public Class Form1

Public ExcelFolder As String
Public selectedfile As String
Public excel As Application
Public workbook As Workbook
Public sheet As Worksheet
Public r As Range
Public array(,) As Object

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

    ExcelFolder = "D:\monica\YUKEN\MARK\Excel"

    Dim dir As New IO.DirectoryInfo(ExcelFolder)
    Dim dir1 As IO.FileInfo() = dir.GetFiles
    Dim file As IO.FileInfo

    For Each file In dir1

        ComboBox1.Items.Add(file)

    Next

End Sub

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

    selectedfile = ComboBox1.GetItemText(ComboBox1.SelectedItem)
    TextBox1.Text = selectedfile

    Dim path As String
    path = ExcelFolder & "\" & selectedfile

    excel = New Application

    excel.Workbooks.Open(path)
    workbook = excel.ActiveWorkbook
    sheet = workbook.Worksheets(1)
    r = sheet.UsedRange

    ' Load all cells into 2d array.
    Array = r.Value(XlRangeValueDataType.xlRangeValueDefault)

    ' Get bounds of the array.
    Dim bound0 As Integer = array.GetUpperBound(0) 'last row number
    Dim bound1 As Integer = array.GetUpperBound(1) 'last column number

    'get total number of rows
    Dim totalrows As Integer = bound0 - 1 'since 1st row is header
    TextBox2.Text = CStr(totalrows)

    sheet.Cells(2, 12) = "YES"
    workbook.Save()
    workbook.Close()
    excel.Quit()
    System.Runtime.InteropServices.Marshal.ReleaseComObject(excel) : excel = Nothing
    System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook) : workbook = Nothing
    System.Runtime.InteropServices.Marshal.ReleaseComObject(sheet) : sheet = Nothing

End Sub
End Class

在shell字符串变量中键入反引号

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