mysql - 如何解决致命的 SQL 语句错误？

Question

我在使用 vb.net 应用程序更新 SQL 数据库中的信息时遇到问题，但最近 I found the solution .但是现在我遇到了另一个问题，如下面的代码所示:

 Private Sub cmdupdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdupdate.Click
   Dim conn As New MySqlConnection
    Dim myCommand As New MySqlCommand

    '#######
    conn.ConnectionString = "server=" & frmLogin.txtserver.Text & ";" _
& "user id=" & frmLogin.txtusername.Text & ";" _
& "password=" & frmLogin.txtpassword.Text & ";" _
& "database=in_out"
    '#######

    myCommand.Connection = conn
    myCommand.CommandText = "UPDATE event SET" _
        & "status = ?Status " _
        & "WHERE user_id = ?UserID AND message_id = ?MessageID AND creator = ?Creator"

    myCommand.Parameters.AddWithValue("?UserID", myUserID)
    myCommand.Parameters.AddWithValue("?MessageID", cbomessage.SelectedValue)
    myCommand.Parameters.AddWithValue("?Status", cbostatus.SelectedItem)
    myCommand.Parameters.AddWithValue("?Creator", myUserID)
    myCommand.Connection = conn
    Try
        myCommand.Connection.Open()
        myCommand.ExecuteNonQuery()
        myCommand.Connection.Close()
    Catch myerror As MySqlException
        MsgBox("There was an error updating the database: " & myerror.Message)
    End Try
End Sub

异常信息是:

Fatal error encountered during command execution.

我不知道这只是一个可以轻松修复的语法错误，还是与我的数据库配置有关。

Answer 1

如果我正确解读了你的屏幕截图，那么你的 UPDATE 语句就放在一起了:

"UPDATE event SET" &
"status = ?Status" &
"WHERE user_id = ....... "

这导致:

UPDATE event SETstatus = ?StatusWHERE user_id = .......

所以您实际上只缺少一些空格!

"UPDATE event SET " &    -- observe the SPACE after the SET !
"status = ?Status " &    -- observe the SPACE after the ?Status
"WHERE user_id = ....... "