vb.net - VB 2008 中的数据类型不匹配

Question

大家好，我有一个问题。当我尝试在我的程序中使用这段代码将供应商添加到数据库时，我遇到了数据类型不匹配错误。据我所知，供应商的状态造成了错误。

我将如何存储名为 radActive 的单选按钮的值和 radInactive在数据库中？我应该使用 Boolean或 String ?我使用 Microsoft Access 作为我的数据库和字段 Status设置为 Yes/No .

这是代码。

Public Sub SupplierInsertData()

    Dim conn As OleDb.OleDbConnection
    Dim cmd As OleDb.OleDbCommand

    Dim SupplierType As String
    Dim Status As Boolean

    'Check for supplier type
    If frmDatabaseSupplier.radLocal.Checked = True Then

        SupplierType = "Local"

    ElseIf frmDatabaseSupplier.radForeign.Checked = True Then

        SupplierType = "Foreign"

    End If

    'Check for supplier status
    If frmDatabaseSupplier.radActive.Checked = True Then

        Status = True

    ElseIf frmDatabaseSupplier.radInactive.Checked = True Then

        Status = False

    End If

    'For inserting of data in the database.
    Dim cmdString As String = "INSERT INTO Supplier(SupplierLastName, SupplierFirstName, SupplierMiddleInitial, " & _
                              "SupplierCompany, SupplierType, SupplierStreetAddress, SupplierCity, SupplierContactNumber, SupplierEmail, " & _
                              "Status)" & _
                              "VALUES('" & frmDatabaseSupplier.txtSupplierLastName.Text & "','" & frmDatabaseSupplier.txtSupplierFirstName.Text & "','" & frmDatabaseSupplier.txtSupplierMiddleInitial.Text & "','" _
                              & frmDatabaseSupplier.txtSupplierCompany.Text & "','" & SupplierType & "', '" & frmDatabaseSupplier.txtSupplierStreetAddress.Text & "','" & frmDatabaseSupplier.txtSupplierCity.Text & "','" _
                              & frmDatabaseSupplier.txtSupplierContactNumber.Text & "','" & frmDatabaseSupplier.txtSupplierEmail.Text & "','" & Status & "')"

    conn = New OleDb.OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\ProjectAnalysisSystem.accdb")

    cmd = New OleDb.OleDbCommand(cmdString, conn)

    conn.Open()
    cmd.ExecuteNonQuery()
    conn.Close()

End Sub

谢谢!

Answer 1

尝试更改代码的最后一部分。
您应该使用参数将文本框或变量的值传递给数据库引擎。
并且不要忘记将像 OleDbConnection 这样的一次性对象封装在 using 中。陈述。

Dim cmdString As String = "INSERT INTO Supplier(SupplierLastName, SupplierFirstName, SupplierMiddleInitial, " & _ 
                          "SupplierCompany, SupplierType, SupplierStreetAddress, SupplierCity, SupplierContactNumber, SupplierEmail, " & _ 
                          "Status)" & _ 
                          "VALUES(@supplierName, @supplierFirst, @supplierMiddle, @supplierCo, @supplierType, @supplierStreet, @supplierCity, " & _
                          "@supplierContact, @supplierMail, @status)"
Using conn As New OleDb.OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\ProjectAnalysisSystem.accdb")
    Dim cmd As OleDbCommand = New OleDb.OleDbCommand(cmdString, conn))
    cmd.Parameters.AddWithValue("@supplierName", frmDatabaseSupplier.txtSupplierLastName.Text)
    cmd.Parameters.AddWithValue("@supplierFirst", frmDatabaseSupplier.txtSupplierFirstName.Text)
    cmd.Parameters.AddWithValue("@supplierMiddle", frmDatabaseSupplier.txtSupplierMiddleInitial.Text)
    cmd.Parameters.AddWithValue("@supplierCo", frmDatabaseSupplier.txtSupplierCompany.Text )
    cmd.Parameters.AddWithValue("@supplierType", SupplierType)
    cmd.Parameters.AddWithValue("@supplierStreet", frmDatabaseSupplier.txtSupplierStreetAddress.Text)
    cmd.Parameters.AddWithValue("@supplierCity", frmDatabaseSupplier.txtSupplierCity.Text)
    cmd.Parameters.AddWithValue("@supplierContact", frmDatabaseSupplier.txtSupplierContactNumber.Text)
    cmd.Parameters.AddWithValue("@supplierMail", frmDatabaseSupplier.txtSupplierEmail.Text)
    cmd.Parameters.AddWithValue("@status", Status) '<- Here the status var is correctly identified as a boolean, not as a string
    conn.Open() 
    cmd.ExecuteNonQuery() 
End Using