Question

我已经使用这段代码连接到数据库..它显示错误，如ConnectionString属性尚未初始化。

Dim sConnString As String = "user id=" + sUserID + ";password=" + sPwd + ";initial catalog=" + sDatabase + ";Connect    Timeout = 30" + ";Pooling=true;Max Pool Size=" + MaxPoolSize + ";Min Pool Size=" + MinPoolSize + ";"

            Dim Conn As New SqlConnection()
            Dim cmd As New SqlCommand()
            cmd.CommandText = "INSERT INTO NEC_Customer_Mst(Customer_Code,Customer_Name) VALUES(Customercode,Customername)"
            cmd.Connection = Conn
            Conn.Open()
            cmd.ExecuteNonQuery()
            Conn.Close()

有什么建议吗？

Answer 1

您声明了连接字符串sConnString，但忘记将连接字符串传递给SqlConnection()：

Dim Conn As New SqlConnection(sConnString)
Conn.Open()

Answer 2

我会更改您的代码，以便您使用using语句。这样它就会在资源完成后清理资源。

Dim sConnString As String = "user id=" + sUserID + ";password=" + sPwd + ";initial catalog=" + sDatabase + ";Connect Timeout=30;Pooling=true;Max Pool Size=" + MaxPoolSize + ";Min Pool Size=" + MinPoolSize + ";"              

Using Conn As New SqlConnection(sConnString)
    Using cmd As New SqlCommand()             
        cmd.CommandText = "INSERT INTO NEC_Customer_Mst(Customer_Code,Customer_Name) VALUES(Customercode,Customername)"             
        cmd.Connection = Conn             
        Conn.Open()             
        cmd.ExecuteNonQuery() 
    End Using
End Using

Answer 3

嗯，它没有初始化：

Dim Conn As New SqlConnection(sConnString)
Conn.Open()

Answer 4

连接Sting属性错误始终在未声明/续订连接时发生

解决方案很简单

dim con as new SqlConnection 
con.connectionString = "Provide your SQL connection"
con.open
'write code or action you want to perform
con.close

希望它有所帮助。

错误：ConnectionString属性尚未初始化？

4 个答案: