Question

我是数据库连接的新手，当我遇到cmdInsert.ExecuteNonQuery()行的问题时，它说INSERT INTO语句有语法错误，我无法弄清楚问题所在：< / p>

Imports System.Data
Imports System.Data.OleDb
Public Class txtNotes
    Dim cnnOLEDB As New OleDbConnection
    Dim cmdInsert As New OleDbCommand

    Dim strConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & System.Environment.CurrentDirectory & "\CourseworkDB"
    'the name of the database goes in here'

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

        cnnOLEDB.ConnectionString = strConnectionString
        cnnOLEDB.Open()

    End Sub

    Private Sub AddFirstName_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AddFirstName.Click
        If txtFirstName.Text <> "" Then

            MsgBox(cmdInsert.CommandText)
            cmdInsert.CommandText = "INSERT INTO Customer (First Name) VALUES (" & txtFirstName.Text & ", '"
            cmdInsert.CommandType = CommandType.Text
            cmdInsert.Connection = cnnOLEDB
            cmdInsert.ExecuteNonQuery()
        Else
            MsgBox("Enter the required values:" & vbNewLine & "1. First Name")
        End If
        cmdInsert.Dispose()
    End Sub
End Class

Answer 1

我强烈建议不要通过将字符串连接在一起来构建SQL字符串的例程。您对SQL-Injection完全敞开大门，特别是如果这是基于Web的。您应该在字符串中使用占位符参数构建命令，然后将参数添加到命令对象。按照命令中显示的顺序添加参数...例如

cmdInsert.CommandText = "INSERT INTO Customer (FirstName, LastName) VALUES ( @parmFirstName, @parmLastName )"
cmdInsert.Parameters.AddWithValue( "@parmFirstName", txtFirstName.Text );
cmdInsert.Parameters.AddWithValue( "@parmLastName", txtLastName.Text );

如果您的字段名称包含嵌入空格，则可以使用不同的数据库不同的是，有些需要单个反引号（数字左侧的键） 1）围绕场地。比如'名字'。有些人使用方括号，例如[名字]。

Answer 2

试试这个

"INSERT INTO Customer (First Name) VALUES ('" & txtFirstName.Text & "')"

Answer 3

警告：Bobby正在关注你。

cmdInsert.CommandText = _
"INSERT INTO Customer (First Name) VALUES ('" & txtFirstName.Text & "')"

插入语句中的语法错误

3 个答案: