我想制作一个程序，在sql server中查询我的数据并导出到excel，我的表单中有2个txtbox。 txtFrom_Date和txtTo_Date，1 btnGenerateReport按钮。用户将在txtbox中输入开始日期和直到日期，当单击btnGenerate时，它将自动将数据导出到指定日期的Excel。
下面是我在报告表格中的全部代码：当我运行我的程序并输入txtFrom_Date 2018-02-21和txtTo_Date 2018-02-21时，我收到一条错误消息“2018年附近的合成文件不正确”。但是当我检查我的数据库时格式就是这样。请帮我解决这个问题谢谢。
'NOTE before coding export excel function must add reference first in
project properties(microsoft excel 2012)
'References that we need
Imports System.Data.SqlClient
Imports System.Data
Imports System.IO.Directory
Imports Microsoft.Office.Interop.Excel 'Before you add this reference
to your project,
' you need to install Microsoft Office and find last version of this
file.
Imports Microsoft.Office.Interop
Public Class Report
Dim dataAdapter As New SqlClient.SqlDataAdapter()
Dim dataSet As New DataSet
Dim command As New SqlClient.SqlCommand
Dim datatableMain As New System.Data.DataTable()
Dim connection As New SqlClient.SqlConnection("SERVER=L4SMTDB01\SMTDBS02;DATABASE=SMT_IT;user=sa;pwd=qwerty;")
Private Sub ReleaseObject(ByVal o As Object)
Try
While (System.Runtime.InteropServices.Marshal.ReleaseComObject(o) > 0)
End While
Catch
Finally
o = Nothing
End Try
End Sub
Private Sub btnGenerateReport_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGenerateReport.Click
' command.CommandText = String.Format("Select * from ComponentCheckerSystem where Last_Update between " & DateTimePicker1.Value.Date.ToOADate() & " and " & DateTimePicker2.Value.Date.ToOADate() & "")
' command.CommandText = String.Format("Select * from ComponentCheckerSystem where Last_Update >= ''" & txtFromDate.Text & "'' and Last_Update <= ''" & txtToDate.Text & "''")
'Assign your connection string to connection object
command.Connection = connection
command.CommandType = CommandType.Text
'' 'You can use any command sel
command.CommandText = String.Format("Select * from ComponentCheckerSystem where Last_Update between ''" & txtFromDate.Text & "'' and ''" & txtToDate.Text & "''")
dataAdapter.SelectCommand = command
connection.Close()
Dim f As FolderBrowserDialog = New FolderBrowserDialog
Try
If f.ShowDialog() = DialogResult.OK Then
'This section help you if your language is not English.
System.Threading.Thread.CurrentThread.CurrentCulture = _
System.Globalization.CultureInfo.CreateSpecificCulture("en-US")
Dim oExcel As Excel.Application
Dim oBook As Excel.Workbook
Dim oSheet As Excel.Worksheet
oExcel = CreateObject("Excel.Application")
oBook = oExcel.Workbooks.Add(Type.Missing)
oSheet = oBook.Worksheets(1)
Dim dc As System.Data.DataColumn
Dim dr As System.Data.DataRow
Dim colIndex As Integer = 0
Dim rowIndex As Integer = 0
'Fill data to datatable
connection.Open()
dataAdapter.Fill(datatableMain)
connection.Close()
'Export the Columns to excel file
For Each dc In datatableMain.Columns
colIndex = colIndex + 1
oSheet.Cells(1, colIndex) = dc.ColumnName
Next
'Export the rows to excel file
For Each dr In datatableMain.Rows
rowIndex = rowIndex + 1
colIndex = 0
For Each dc In datatableMain.Columns
colIndex = colIndex + 1
oSheet.Cells(rowIndex + 1, colIndex) = dr(dc.ColumnName)
Next
Next
'Set final path
Dim fileName As String = "\Summary of Operator Scan Wrong Items" + ".xls" 'just set the file Name
Dim finalPath = f.SelectedPath + fileName
txtPath.Text = finalPath
oSheet.Columns.AutoFit()
'Save file in final path
oBook.SaveAs(finalPath, XlFileFormat.xlWorkbookNormal, Type.Missing, _
Type.Missing, Type.Missing, Type.Missing, XlSaveAsAccessMode.xlExclusive, _
Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing)
'Release the objects
ReleaseObject(oSheet)
oBook.Close(False, Type.Missing, Type.Missing)
ReleaseObject(oBook)
oExcel.Quit()
ReleaseObject(oExcel)
'Some time Office application does not quit after automation:
'so i am calling GC.Collect method.
GC.Collect()
MessageBox.Show("Export done successfully!")
End If
Catch ex As Exception
MessageBox.Show(ex.Message, "Warning", MessageBoxButtons.OK)
End Try
End Sub
Private Sub Report_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
DateTimePicker1.CustomFormat = "YYYY-MMMM-DD"
DateTimePicker2.CustomFormat = "YYYY-MMMM-DD"
End Sub
结束班
永远不要相信用户将放在文本框中的内容。这可能对您的数据库非常不利。学习使用参数。这将保护您的数据库并保存格式化SQL字符串的麻烦。在表单中添加2个DateTimePickers。
command.Connection = connection
command.CommandType = CommandType.Text
command.CommandText = "Select * from ComponentCheckerSystem where Last_Update between @FromDate AND @ToDate;"
command.Parameters.Add("@FromDate", SqlDbType.Date).Value = DateTimePicker1.Value.Date
command.Parameters.Add("@ToDate", SqlDbType.Date).Value = DateTimePicker2.Value.Date
这个怎么样？
Imports System.Data.SqlClient
Public Class Form1
Dim connetionString As String
Dim connection As SqlConnection
Dim adapter As SqlDataAdapter
Dim cmdBuilder As SqlCommandBuilder
Dim ds As New DataSet
Dim changes As DataSet
Dim sql As String
Dim i As Int32
Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
connetionString = "Data Source=EXCEL-PC\SQLEXPRESS;Initial Catalog=Test;Trusted_Connection=True;"
connection = New SqlConnection(connetionString)
sql = "Select * from Orders"
Try
connection.Open()
adapter = New SqlDataAdapter(Sql, connection)
adapter.Fill(ds)
DataGridView1.DataSource = ds.Tables(0)
connection.Close()
Catch ex As Exception
MsgBox(ex.ToString)
End Try
End Sub
Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
'NOTE: for this code to work, there must be a PK on the Table
Try
cmdBuilder = New SqlCommandBuilder(adapter)
changes = ds.GetChanges()
If changes IsNot Nothing Then
adapter.Update(changes)
End If
MsgBox("Changes Done")
Catch ex As Exception
MsgBox(ex.ToString)
End Try
End Sub
Private Sub DataGridView1_Click(sender As Object, e As EventArgs) Handles DataGridView1.Click
DataGridView1.DefaultCellStyle.SelectionBackColor = Color.Orange
End Sub
End Class