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作为一个新手,我越来越老试图找出如何返回一个字符串值从一个SQL选择命令与VB代码背后。我有的程序如下。基本上我想要做的就是提取表格BuildFields中的DisplayName字段中的值(带有WHERE条件),并将其放置到formview模板中的标签的文本字段中。看起来应该不难,我确信我错过了一些东西。有没有人有任何想法或看到我做错了什么?这不会返回任何东西。谢谢。从sql select命令返回字符串值vb.net代码背后
Protected Sub FormView1_DataBound(ByVal sender As Object, ByVal e As System.EventArgs) Handles FormView1.DataBound
Dim dt As New DataTable()
Dim conCString As String = ConfigurationManager.ConnectionStrings("conCString").ConnectionString
Dim lbl As Label = FormView1.FindControl("Label1")
Dim sqlConnection As SqlConnection = New SqlConnection(ConfigurationManager.ConnectionStrings("conCString").ConnectionString)
Dim cmd As New SqlCommand
cmd.CommandText = "SELECT [DisplayName] FROM [BuildFields] WHERE ([TableID] = N'Capacitors') AND (ColumnID = N'UserField01') ORDER BY [ColumnID]"
cmd.CommandType = CommandType.Text
cmd.Connection = SqlConnection
Try
SqlConnection.Open()
Dim result As String
result = cmd.ExecuteScalar()
lbl.Text = result
sqlConnection.Close()
Catch ex As Exception
End Try
End Sub
可能的重复http://stackoverflow.com/questions/10856686/need-to-get-value-from-sql-query – 2014-09-20 16:15:03