Question

我的更新文本框名为：updateref 我想用所选列更新的数据字段是refid

我很抱歉，我是一个菜鸟，并且全新的将mysql与vb.net集成，任何帮助都将不胜感激！谢谢！

'MYSQL代码

    Dim con As MySqlConnection = New MySqlConnection("my info")
    Dim reader As MySqlDataReader

    Try
        con.Open()
        Dim query As String
        Dim command As MySqlCommand
        query = "UPDATE exploitsociety SET reffer='" + updateref.Text + "' WHERE reffer='" + DataGridView1.CurrentCell.Selected + "';"
        command = New MySqlCommand(query, con)
        reader = command.ExecuteReader

        Catch ex As MySqlException
        MessageBox.Show(ex.Message)
    Finally
        con.Dispose()
        End try
        con.Close()

基本上我只想编辑dataviewgrid中的列数据，然后点击更新，但它很复杂，所以我添加了一个文本框，看看我是否可以这样做，我也不能。

Answer 1

您似乎尝试更新查询

Dim con As MySqlConnection = New MySqlConnection("my info")
Dim reader As MySqlDataReader

Try
    con.Open()
    Dim query As String


     Dim command As MySqlCommand
        query = "UPDATE exploitsociety SET reffer='" + updateref.Text + "' WHERE reffer='" + DataGridView1.CurrentCell.Selected + "';"
        command = New MySqlCommand(query, con)
  //      reader = command.ExecuteReader

  //     you need to run ExecuteNonQuery instead of ExecuteReader
      int UpdatedRows=  command.ExecuteNonQuery();

        Catch ex As MySqlException
        MessageBox.Show(ex.Message)
    Finally
        con.Dispose()
        End try
    con.Close()

仅供参考

<强>的ExecuteReader

使用命令对象执行SQL查询或存储过程时，将使用Execute Reader返回行集。这个是仅向前检索记录，它用于从头到尾读取表值。（阅读更多关于ExecuteReader）

<强>的ExecuteNonQuery

ExecuteNonQuery方法将返回使用INSERT，DELETE或UPDATE操作影响的行数。此ExecuteNonQuery方法仅用于insert，update和delete，Create和SET语句。（Read More about ExecuteNonQuery）

Answer 2

试试这个并查看它抛出的异常（如果有的话）：

Using cn = New MySQLConnection("my info")
    cn.Open()
    Using cmd = New MySQLCommand("UPDATE exploitsociety SET reffer='" + updateref.Text + "' WHERE reffer='" + DataGridView1.CurrentCell.Selected + "'", cn)
         cmd.ExecuteNonQuery()
    End Using
End Using

Answer 3

然后尝试以下查询进行更新，删除单引号。

query = "UPDATE exploitsociety SET refid=" + updateref.Text + " WHERE refid=" + DataGridView1.CurrentCell.Selected
 command = New MySqlCommand(query, con)
 command.ExecuteNonQuery()

您也可以获得所选单元格值，如下所示

DataGridView1.SelectedCells[<index of column>].Value.ToString();

使用mysql更新datagridview

3 个答案: