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MS access and calling saved Queries

Posted on 2016-10-28
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Last Modified: 2016-11-01
From VB.NET code, I'm calling a query saved in an Access database.   Is there a way to call multiple saved queries, each of which return a set of records, and get back each set of records in  a DataTable within a in DataSet?  Here's my current code:

   Dim con As OleDbConnection = New OleDbConnection("Provider=Microsoft.JET.oledb.4.0;data source=C:\MyAccess\service.mdb")

        Dim cmd As New OleDbCommand
        cmd.CommandType = CommandType.StoredProcedure
        cmd.CommandText = "GetWorkOrder"
        cmd.Parameters.Add("@LocalID", OleDbType.Integer).Value = 35

        Try
            cmd.Connection = con
            con.Open()

            Dim da As OleDbDataAdapter = New OleDbDataAdapter(cmd)

            Dim dt As New DataTable

            Dim ds As DataSet = New DataSet()
            da.Fill(ds, "WorkOrder")

            dt = ds.Tables("WorkOrder")

            con.Close()
            con.Dispose()

        Catch ex As Exception
        End Try
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Question by:HLRosenberger
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4 Comments
 
LVL 35

Expert Comment

by:YZlat
ID: 41864543
Could try something like that:

Dim cmd1 As New OleDbCommand
Dim cmd2 As New OleDbCommand
Dim cmd3 As New OleDbCommand
Dim dt1 As New DataTable
Dim dt2 As New DataTable
Dim dt3 As New DataTable
            

con.ConnectionString = "Provider=Microsoft.JET.oledb.4.0;data source=C:\MyAccess\service.mdb"
con.Open()


    cmd1.Connection = con
    cmd1.CommandType = CommandType.StoredProcedure
    cmd1.CommandText = "GetWorkOrder"
    Dim da1 As OleDbDataAdapter = New OleDbDataAdapter(cmd1)
    cmd1.Parameters.Add("@LocalID", OleDbType.Integer).Value = 35
  Dim ds1 As DataSet = New DataSet()
    da1.Fill(ds1, "WorkOrder")
dt1 = ds1.tables("WorkOrder")


   cmd2.Connection = con
    cmd2.CommandType = CommandType.StoredProcedure
    cmd2.CommandText = "SecondQueryName"
    Dim da2 As OleDbDataAdapter = New OleDbDataAdapter(cmd2)
    cmd2.Parameters.Add .....
  Dim ds2 As DataSet = New DataSet()
    da2.Fill(ds2, "Table2")
dt2 = ds2.tables("Table2")


     cmd3.Connection = con
    cmd3.CommandType = CommandType.StoredProcedure
    cmd2.CommandText = "ThirdQueryName"
    Dim da3 As OleDbDataAdapter = New OleDbDataAdapter(cmd3)
    cmd3.Parameters.Add .....
  Dim ds3 As DataSet = New DataSet()
    da3.Fill(ds3, "Table3")
dt3 = ds3.tables("Table3")

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Author Comment

by:HLRosenberger
ID: 41864591
But that hits the database three time, correct?  it requires three open connections, correct?  I was looking to do this to improve speed.
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LVL 42

Accepted Solution

by:
PatHartman earned 2000 total points
ID: 41864610
Access queries can only return a single recordset at one time.  If you need three separate recordsets, you must run three queries.  If the queries return the same columns in the same order, you could create a union query to get back a single recordset.
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Author Closing Comment

by:HLRosenberger
ID: 41868357
Thanks!
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