使用类连接到SQL Server数据库是否可以？

Question

I have a public class called dbOPS that has some subs and functions like:

 Public Function getSqlReader(ByVal sql As String) As SqlDataReader
    Dim cmd As New SqlCommand(sql, getConn)
    cmd.CommandTimeout = 360
    Dim dr As SqlDataReader = cmd.ExecuteReader(Data.CommandBehavior.CloseConnection)

    Return dr
End Function

Public Function getSqlScalar(ByVal sql As String)
    Dim cmd As New SqlCommand(sql, getConn)
    cmd.CommandTimeout = 360
    Dim cnt = cmd.ExecuteScalar
    closeCX()
    Return cnt
End Function

Public Sub ExecuteSql(ByVal sql As String)
    Dim cmd As New SqlCommand(sql, getConn)
    cmd.CommandTimeout = 360
    cmd.ExecuteNonQuery()
    closeCX()
End Sub

I then use the following command once per page and use the db variable many (many) times throughout the page:

Dim db as new dbOPS

Recently, I have started getting many errors

ExecuteScalar requires an open and available connection. the connection's current state is connecting

Is this the cause?

Is there any way around it without rewriting every page and every command to open its own connection?

Thanks

Answer 1

It's probably best to detect the connection and reopen them just in case it is not open prior to executing the command.

If (cmd.Connection.State != ConnectionState.Open) Then
    cmd.Connection.Open()

Do this as part of your helper methods.