Question

我有数据库表日程表，它有7列（ID，Reserve_No，姓氏，名字，服务，电话号码，日期_时间）我想只显示 Date_Time 列。

这是我在Datagridview上显示数据库的代码

Dim DataAdapter As New MySqlDataAdapter
        Dim DataTable As New DataTable
        Dim cmd As New MySqlCommand
        MySqlConn.Open()
        With cmd
            .Connection = MySqlConn
            .CommandText = "SELECT * FROM schedule"
        End With
        DataAdapter.SelectCommand = cmd
        DataTable.Clear()
        DataAdapter.Fill(DataTable)
        DataGridView1.DataSource = DataTable
        MySqlConn.Close()

Answer 1

从MySQL表中选择列：

如果您不想查看表格中的整行，只需将其命名即可您感兴趣的列，以逗号分隔。

更改您的查询以选择一列：

    Dim DataAdapter As New MySqlDataAdapter
    Dim DataTable As New DataTable
    Dim cmd As New MySqlCommand
    MySqlConn.Open()
    With cmd
        .Connection = MySqlConn
        .CommandText = "SELECT Date_Time FROM schedule"
    End With
    DataAdapter.SelectCommand = cmd
    DataTable.Clear()
    DataAdapter.Fill(DataTable)
    DataGridView1.DataSource = DataTable
    MySqlConn.Close()

您还可以最小化输出，检索每个唯一输出只需添加关键字DISTINCT即可记录一次。

More reference

只显示一列Datagridview mysql vb.net

1 个答案: