Visual Studio 和 SQL Server 2008 出错答案

【问题标题】：Error with Visual Studio and SQL Server 2008Visual Studio 和 SQL Server 2008 出错
【发布时间】：2013-08-03 17:44:04
【问题描述】：

我在调试网站代码时收到此错误。我的目标是将数据插入 SQL Server 2008 数据库。

来源错误：

    objcnd.Parameters.Add(New SqlParameter("@username", strun))
    Ligne 22 :         objcnd.Parameters.Add(New SqlParameter("@password", strpw))
    Ligne 23 :         objcnd.ExecuteNonQuery()
    Ligne 24 :         'close connection
    Ligne 25 :         objconnection.Close()

错误

[SqlException (0x80131904): '?' 附近的语法不正确。]
System.Data.SqlClient.SqlConnection.OnError(SqlException 异常, Boolean breakConnection) +2030802
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException 异常, Boolean breakConnection) +5009584
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() +234
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +2275
.....

vb.net编写的代码源

Imports System
Imports System.Data
Imports System.Data.SqlClient

Partial Class index
   Inherits System.Web.UI.Page

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)   Handles Button1.Click
    Dim strun As String = Request.Form("username")
    Dim strpw As String = Request.Form("password")

    Dim objconnection As SqlConnection = Nothing
    Dim objcnd As SqlCommand = Nothing
    Dim strconnection As String, strSQL As String
    'connection string 
    strconnection = ("Data Source=myPC-PC;Database=mytempDB;Integrated Security=true ")
    objconnection = New SqlConnection(strconnection)
    objconnection.ConnectionString = strconnection
    objconnection.Open()
    strSQL = "insert into userTD(username,password) values(?,?)"
    objcnd = New SqlCommand(strSQL, objconnection)
    objcnd.Parameters.Add(New SqlParameter("@username", strun))
    objcnd.Parameters.Add(New SqlParameter("@password", strpw))
    objcnd.ExecuteNonQuery()
    'close connection
    objconnection.Close()
    Response.Write("Entered Successfully ! ")

End Sub
End Class

提前致谢。

【问题讨论】：

标签： vb.net visual-studio-2010 sql-server-2008 web-site-project

【解决方案1】：

对SqlClient引擎使用与参数同名的占位符

strSQL = "insert into userTD(username,password) values(@username,@password)"

另外，我建议您使用using statement 进行连接（对所有一次性对象都更好，但是如果您遇到异常并且它保持打开状态，则连接是一个大问题）

Using objconnection = New SqlConnection(strconnection)
   ......

   objcnd.ExecuteNonQuery()

   ' No need to close explicititly the connection, ' 
   ' the following End Using statement takes care of that'
   ' also in case of exceptions.....'
End Using

【讨论】：