在Windows 7 Pro上运行的Visual Basic 2013 ASP.NET Web应用程序项目中,每次运行它都会收到此错误。
如果我在运行表之前将其删除,则我的应用程序会创建表,但会出现错误。
如果表在运行之前存在,则应用会尝试创建表,忽略错误并继续,但是出现错误。
该Page_Load
功能按预期顺序进行,没有错误,直至结束。
然后发生错误。
Imports System.Data.SqlClient
Public Class WebForm2
Inherits System.Web.UI.Page
Private ConnectionString As String = "Integrated Security=SSPI;" + "Initial Catalog=;" + "Data Source=localhost;"
Private reader As SqlDataReader = Nothing
Private conn As SqlConnection = Nothing
Private cmd As SqlCommand = Nothing
Private sql As String = Nothing
Public Const DEBUG_DEFAULT_CLIENT_ID = "NATIONS_BURGERS"
Public Const DEBUG_DEFAULT_JOB_ID = "FRY_COOK_2014_07_05"
Public client_ID
Public job_ID
Public client_job_table
' InitializeS the job application page.
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
' Initialize data:
client_ID = DEBUG_DEFAULT_CLIENT_ID
job_ID = DEBUG_DEFAULT_JOB_ID
client_job_table = client_ID + "_" + job_ID
' App selects client job table :
Dim command_successful =
ExecuteSQLStmt(" select * from " + client_job_table)
' Create table if it doesn't exist:
If Not command_successful Then
ExecuteSQLStmt("CREATE TABLE " + client_job_table + _
"(" + _
"FIRST_NAME varchar(255)," + _
"LAST_NAME varchar(255)," + _
"PHONE varchar(255)" + _
");")
End If
set_22_button.Visible = GridView1.Visible
set_333_button.Visible = GridView1.Visible
End Sub
' Sends sql command to ehires database.
Private Function ExecuteSQLStmt(ByVal sql As String)
' Open the connection
ConnectionString = "Data Source=<my IP>;Initial Catalog=<my database name>;Persist Security Info=True;User ID=Doug;Password=ThankYou!!"
Dim connection As New SqlConnection(ConnectionString)
connection.ConnectionString = ConnectionString
connection.Open()
cmd = New SqlCommand(sql, connection)
Dim command_successful = True
On Error Resume Next
cmd.ExecuteNonQuery()
If Err.Number Then
command_successful = False
Dim reason = Err.Description
Else
command_successful = True
End If
connection.Close()
Return command_successful
End Function 'ExecuteSQLStmt
问题是我正在使用GridView UI控件查看表,但是GridView没有被更新,所以从不显示该表已经存在。
通过更新GridView解决了问题。
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