Question

我正在使用带有OleDb数据库的vb.net。以下是我的代码，虽然我要搜索数据库，但在进行更改后无法保存。它在Command.ExecuteNonQuery级别显示以下错误：

“未处理OleDbException，标准表达式中的数据类型不匹配。”

Imports System.Data.OleDb
Public Class Form1

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

End Sub

Private Sub Src_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Src.Click
    Dim Connection1 As New OleDb.OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\Satyam\Documents\Database2.accdb;" & "Persist Security Info=False;" & "Jet OLEDB:Database Password=" & "your pass" & ";")
    Dim cmd As OleDbCommand

    Dim dr As OleDbDataReader
    Try
        Connection1.Open()
        cmd = New OleDbCommand("SELECT *  from Table1 WHERE ID=" & IDtxt.Text & "", Connection1)

        dr = cmd.ExecuteReader
        If dr.Read Then
            Me.IDtxt.Text = dr("ID")
            Me.Hbtxt.Text = dr("Hb")
            Me.TCtxt.Text = dr("TC")
            Me.DCtxt.Text = dr("DC")

            dr.Close()
        Else
            MsgBox("No Record")
        End If
    Catch
    End Try
    Connection1.Close()
End Sub


Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Dim Connection1 As New OleDb.OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\Satyam\Documents\Database2.accdb;")
    Connection1.Open()
    Dim ID : ID = Me.IDtxt.Text
    Dim Hb : Hb = Me.Hbtxt.Text
    Dim TC : TC = Me.TCtxt.Text
    Dim DC : DC = Me.DCtxt.Text


    Dim command As New OleDbCommand("UPDATE Table1 SET Hb = '" & Hb & "',TC = '" & TC & "',DC = '" & DC & "' WHERE ID = '" & ID & "'", Connection1)
    Command.ExecuteNonQuery()

    Connection1.Close()


End Sub

Answer 1

在你的代码中使用参数......就像这个..

Dim command As New OleDbCommand("UPDATE Table1 SET Hb = @hb,TC = @tc,DC = @DC WHERE ID = @id", Connection1)

Command.parameters.add(new sqlparameter("@hb",Hb))
Command.parameters.add(new sqlparameter("@tc",tc))
Command.parameters.add(new sqlparameter("@dc",dc))
Command.parameters.add(new sqlparameter("@id",id))
Command.ExecuteNonQuery()

搜索数据并将其保存到数据库

1 个答案: