Question

遇到持久性错误。我的表单允许用户查看特定组中的元素列表。组号的输入是一个名为groupbox的组合框，输出是一个名为ElementResults的组合框。我收到了错误：GroupSearch.ExecuteNonQuery（）

Imports System.Data.OleDb
Public Class ElementsSearch
Public Shared connectionString As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data        Source=C:\Documents and Settings\A\My Documents\Visual Studio 2010\Projects\A2\Element.accdb;Persist Security Info=False;"
Public Shared ElementsTable

Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click

    Dim Search As New OleDbConnection(connectionString)
    Search.Open()

    Dim SearchCriteria As String
    SearchCriteria = Groupbox.Text
    Dim query As String = "SELECT * From ElementsTable WHERE Group='" & SearchCriteria & "'"
    Dim GroupSearch As New OleDbCommand(query, Search)
    GroupSearch.ExecuteNonQuery()
    Dim reader As OleDbDataReader = GroupSearch.ExecuteReader()
    ElementResults.Text = Convert.ToString(reader("Name"))

End Sub
End Class

Answer 1

您定义字段group，这是一个保留关键字。

请尝试使用[group]，例如：

SELECT * From ElementsTable WHERE [Group]='aaa'

Answer 2

为了避免您遇到的所有错误，请考虑将代码更改为以下内容：

Using connection As New OleDbConnection(connectionString)
    connection.Open()
    Using command As New OleDbCommand("SELECT * From ElementsTable WHERE [Group]=@Group", connection)
        command.Parameters.AddWithValue("@Group", SearchCriteria)
        Using reader As OleDbDataReader = command.ExecuteReader()
            Do While reader.Read()
                ElementResults.Text = reader.GetString("Name")
            Loop
        End Using
    End Using
End Using

OleDbException未处理，WHERE子句中的语法错误？

2 个答案: