asp.net barcode reader control 19: Working with External Databases in Microsoft Office

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19: Working with External Databases
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Click the three-dot symbol on the ODBC Connect Str property and you can then select a DSN to use Click the Machine Data Source tab and scroll down to your DSN You will then be asked if you want the password included in the connection string, which raises a security issue If you do not include it, the user will be prompted for the password every time the query is run, which could be annoying If you include it in the connection string, anyone can see it A solution is to include it in the connection string, but to lock down the database so query structures cannot be accessed See 24 on how to do this A further problem is that you cannot build your query using the Access GUI You must write your query in SQL and use the same notation that the database platform is expecting This is because your query will run directly on the database server If you are connecting to Oracle or SQL Server, you need to use a percent sign (%) instead of a star (*) for wild card characters and use single quotes instead of double quotes to denote strings Also, you cannot use IIF Instead, you must use the notation CASE WHEN THEN ELSE END
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It is often a very good idea to test the query out on the database itself using SQL Server Manager or TOAD (Tool for Oracle Application Development) However, the problem is that you as a humble Access developer may not be allowed anywhere near these tools! This route is considerably more complicated than using simple linked tables, but it has the huge advantage of speed, which may be very important in your application
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ActiveX Data Objects (ADO) is the Microsoft technology for connecting to databases ADO is a Component Object Model (COM) that you can direct to use the data from an external database either using a connection string or a DSN The link tells your code where the database is and gives the ID and password to get into it ADO provides you with the tools to hook into the database using that ODBC link and to read and write the data To use ADO in your code, you must first include a reference to the Object Library by selecting Tools | References from the VBE menu Scroll down until you get to Microsoft ActiveX Data Objects 60 Library and Microsoft ActiveX Data Objects Recordset 60 Library, as shown in Figure 19-7 You may have earlier version numbers of these going back
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19: Working with External Databases
to version 2, depending on what version of Windows you are running, but they will still work in the same way If you do not have Version 60, use the latest version you have Mark both check boxes on the left and click OK It is important to have this reference so it gives you full functionality to ADO It is also good programming practice You can now enter the following code into a module This assumes you are connecting to a SQL Server database, but you can also use other Access databases for the connection string (see the following examples)
Sub ADOExtract() Dim RsADO As ADODBRecordset, RsAccess As Recordset Dim Cnct As String,Cnct1 as String, Cnct2 as String Set Connection = New ADODBConnection Cnct1 = "Provider=SQLOLEDB;Driver={SQL Server Native Client 100};" Cnct2="Server=MyServer;Database=MyDatabase;Uid=MyId;Pwd=MyPassword;" Cnct=Cnct1 & Cnct2 ConnectionCommandTimeout = 60 ConnectionOpen ConnectionString:=Cnct Set RsAccess = CurrentDbOpenRecordset("MyDestinationTable") Set RsADO = New ADODBRecordset With RsADO Open Source:="select * from MySourceTable", _ ActiveConnection:=Connection, CursorType:=adOpenStatic Do Until RsADOEOF RsAccessAddNew RsAccess!Field1 = RsADO!Field1 RsAccess!Field2 = RsADO!Field2 RsAccessUpdate RsADOMoveNext Loop End With Set RsADO = Nothing Set RsAccess = Nothing End Sub
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