Error : Cannot open any more tables

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hi,

We have developed one multithreaded application in vb.net and we are using Microsoft Access Jet engine 4.0. for database And when i run the application it execute successfully but after some time it gave an error "Can not open any more table." We searched a lot and we found that we have to close all the connections and all the readers. and release all the resources. we have done that also but its not working. so can any one help us??

Regards,

Riddhi

Posted 14-Oct-11 3:11am

Riddhi15

Updated 2-Aug-16 8:58am

Not Active

v2

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3 solutions

Solution 1

see http://support.microsoft.com/kb/304536[^] or http://www.google.com/search?q=Jet+4.0+%22Error+%3A+Cannot+open+any+more+tables%22&sourceid=ie7&rls=com.microsoft:da:IE-SearchBox&ie=&oe=[^]

Posted 14-Oct-11 3:14am

Simon Bang Terkildsen

Updated 14-Oct-11 3:15am

v2

Comments

Espen Harlinn 15-Oct-11 4:27am

My 5 - That's why I really don't like Access for professional development

Simon Bang Terkildsen 15-Oct-11 14:04pm

True, though I'm sure Access has it's uses, I just don't know of any :D

Solution 3

Hi,
Really changing from MS Accesss to mySql when using VB.Net will solve this problem. But i discover another way to get rid of this problem.

i created a procedure called conState see below

VB

Public Sub conState()
        If con.State = ConnectionState.Closed Then
            con.Open()
        End If
End Sub

So before any Update/select or insert statement i added

con.close()
call conState()

Like

VB

For i = 0 to datagridview1.rowscount  - 1
con.close
call conState()
con.Close()
                        con.Open()

                        cmd = New OleDbCommand("insert into SBCCourses (lvid, stid, course , Score , sem) values ('" & Lid & "','" & Sid & "','" & scode & "','" & sgrade & "' , '2' )", con)
                      
                        cmd.ExecuteNonQuery()
                        cmd.Dispose()
Next

I find this really helpfull

Posted 2-Aug-16 8:58am

Umar Balarabe Ubaz

Comments

Richard Deeming 2-Aug-16 15:08pm

This question was asked, answered, and solved, nearly FIVE YEARS AGO.

And your "solution" is vulnerable to SQL Injection[^].

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Not Active · Accepted Answer · 2011-10-14T03:15:00

Solution 2

Sounds like some thread synchronization issues. Access wasn't designed as a multi-user, multi-threaded application. I would consider switching to SQL Server Express. It is free, has better performance and capabilities and can be easily upgraded to a full version when necessary.

Posted 14-Oct-11 3:15am

Not Active

Comments

Simon Bang Terkildsen 14-Oct-11 9:16am

Sound advice

Espen Harlinn 15-Oct-11 4:25am

I agree, my 5