使用文本框的Datagrid过滤器

Question

美好的一天！我正在添加一个文本框，用于过滤名称，姓氏等，但我只能过滤一个数据。

这是代码：

Private Sub Filter_TextChanged(sender As Object, e As EventArgs) Handles filter.TextChanged
        'Dim command As New MySqlCommand("SELECT * FROM `employee` WHERE CONCAT('Firstname','Lastname') like '%" & filter.Text & "%'")
        Dim conenc As New MySqlConnection
        conenc.ConnectionString = ("host=127.0.0.1; user=root; database=library")
        Dim tablee As New DataTable()
        Try
            conenc.Open()
            Dim adapter As New MySqlDataAdapter("SELECT * FROM library.employee WHERE Firstname like '%" & filter.Text & "%'", conenc)
            adapter.Fill(tablee)
            emplo.DataSource = tablee
            conenc.Close()

        Catch ex As Exception
            MsgBox(ex.Message)
        Finally
            conenc.Dispose()

        End Try

在线：

Dim adapter As New MySqlDataAdapter（“SELECT * FROM library.employee WHERE Firstname like'％”＆filter.Text＆“％'”，conenc）

我想添加多个值，如姓氏，中间名。

Answer 1

如果设置了第一个过滤器，则需要将“And”设置为未使用的字符串变量，如果选择另一个过滤器则在该过滤器的SQL之前连接“And”。我希望这是有道理的。

Answer 2

也许尝试更像这样（使用参数）

    Dim TxBoxSearch As New TextBox
    Dim conenc As New SqlConnection
    Dim CmdEmployee As New SqlCommand("SELECT *, Firstname + Lastname AS FullName 
                                        FROM library.employee WHERE FullName like '%@SearchString%'", conenc)
    With CmdEmployee
        .Parameters.AddWithValue("@SearchString", TxBoxSearch.Text)
    End With

Answer 3

我想你应该尝试这段代码，只需在你的代码中为姓氏添加第二个条件，如下所示：

Dim adapter As New MySqlDataAdapter("SELECT * FROM library.employee WHERE Firstname like '%" & filter.Text & "%' and Lastname like '%" & filter2.Text & "%'", conenc)

我希望它可以帮助你,,, ^ _ ^