sql-server - 如何使用 VB Net 将数据插入 SQL Server

Question

我是vb.net新手，我需要使用vb.net在表中插入数据，请任何人帮忙

我已经尝试过了

这里我尝试了示例代码

我收到此异常列名称或提供的值的数量与表定义不匹配。 提前致谢

Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As  System.EventArgs)  Handles btnSave.Click

    Dim strName As String = txtName.Text
    Dim strId As String = txtID.Text
    Dim strPhone As String = txtPhone.Text
    Dim strBranch As String = cmboxBranch.SelectedItem.ToString()
    Dim  strCourse As String = cmbboxCourse.SelectedItem.ToString()
    Dim dblFee As Double = Double.Parse(txtFee.Text) 

    Dim strCommand As String = "insert into student values('" & strName & "','" & strId &    "','" & strPhone & "','" & strBranch & "','" & strCourse & "'," & dblFee & ")"

    Dim command As SqlCommand = New SqlCommand(strCommand, connection)
    command.CommandType = CommandType.Text

    '' MsgBox(strCommand) 

    connection.Open()
    If (command.ExecuteNonQuery().Equals(1)) Then
        MsgBox("Information stored in database")
    Else
        MsgBox("Not stored in database")
    End If

End Sub

Answer 1

这意味着在 INSERT 语句的 VALUES 子句中指定的值的数量不等于表中的总列数。如果您只尝试在选定的列上插入，则必须指定列名。

另一点是，由于您使用的是 ADO.Net ，因此始终参数化您的查询以避免 SQL 注入(inject)。您现在正在做的是您正在击败 sqlCommand 的使用。

例如

Dim query as String = String.Empty
query &= "INSERT INTO student (colName, colID, colPhone, "
query &= "                     colBranch, colCourse, coldblFee)  "
query &= "VALUES (@colName,@colID, @colPhone, @colBranch,@colCourse, @coldblFee)"

Using conn as New SqlConnection("connectionStringHere")
    Using comm As New SqlCommand()
        With comm
            .Connection = conn
            .CommandType = CommandType.Text
            .CommandText = query
            .Parameters.AddWithValue("@colName", strName)
            .Parameters.AddWithValue("@colID", strId)
            .Parameters.AddWithValue("@colPhone", strPhone)
            .Parameters.AddWithValue("@colBranch", strBranch)
            .Parameters.AddWithValue("@colCourse", strCourse)
            .Parameters.AddWithValue("@coldblFee", dblFee)
        End With
        Try
            conn.open()
            comm.ExecuteNonQuery()
        Catch(ex as SqlException)
            MessageBox.Show(ex.Message.ToString(), "Error Message")
        End Try
    End Using
End USing 

PS:请将查询中指定的列名称更改为表中找到的原始列。