如何将mysql数据库中的空列导入到vb.net中的textbox

Imports MySql.Data.MySqlClient

Dim connectionString As String = "server=your_server_address;user id=your_username;password=your_password;database=your_database"
Dim connection As New MySqlConnection(connectionString)

Try
    connection.Open()
    ' 连接成功，可以执行查询操作
Catch ex As Exception
    ' 连接失败，处理异常
Finally
    connection.Close()
End Try

Dim query As String = "SELECT column_name FROM table_name WHERE column_name IS NULL"
Dim command As New MySqlCommand(query, connection)
Dim reader As MySqlDataReader

Try
    reader = command.ExecuteReader()

    While reader.Read()
        ' 读取每一行数据，并将空列数据导入到TextBox中
        Dim data As String = reader.GetString("column_name")
        TextBox1.Text = data
    End While

    reader.Close()
Catch ex As Exception
    ' 处理异常
End Try