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DBPassword As String
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DBPath As String
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DBServer As String
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DBType As Long
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DBUserId As String
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DBWindowsAuth As Boolean
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c = ""
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DBType = GetSetting("Excel2k3 VBA", "Query", "DBType", 0)
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Select Case DBType Case 0 DBPath = GetRegistryValue("DBPath", "<enter path to database file>") If Len(DBPath) <> 0 Then c = "Provider=Microsoft.Jet.OLEDB.4.0" c = c & ";Data Source=" & DBPath End If Case 1 DBWindowsAuth = GetSetting("Excel2k3 VBA", "Query", _ "DBWindowsAuth", True)
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Part 6: Excel and the Outside World: Collaborating Made Easy
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24
Microsoft Office Excel 2003 Programming Inside Out
DBName = GetRegistryValue("DBName", "<enter database name>") DBPassword = GetRegistryValue("DBPassword", "<enter password>") DBServer = GetRegistryValue("DBServer", "<enter database server>") DBUserId = GetRegistryValue("DBUserId", "<enter userid>") If Len(DBServer) = 0 Then DBServer = "localhost" End If If Len(DBName) <> 0 Then c = "Provider=SQLOLEDB.1" c = c & ";Data Source=" & DBServer c = c & ";Initial Catalog=" & DBName If DBWindowsAuth Then c = c & ";Integrated Security=SSPI" ElseIf Len(DBUserId) <> 0 And Len(DBPassword) <> 0 Then c = c & ";User ID=" & DBUserId c = c & ";Password=" & DBPassword Else c = "" End If End If Case 2 c = GetRegistryValue("ConnectionString", "<enter connection string>") End Select BuildConnectionString = c End Function
After setting c to an empty string, the routine grabs the type of database from the registry and stores it in DBType. This variable is then incorporated into a Select Case statement, which builds different connection strings depending on the type of database being used. If an Access (Jet) database is being used, the DBPath value is extracted from the Windows registry using the GetRegistryValue helper function. This function takes two parameters, the key and the default value. If the value extracted from the registry is different than the default value, an empty string will be returned.
24
Part 6: Excel and the Outside World: Collaborating Made Easy
Excel Query Program If GetRegistryValue returned an empty string (len = 0), c remains an empty string. Otherwise, the appropriate connection string is created for an Access database using the value extracted from the registry. The same approach is used for SQL Server databases (DBType = 1). The value for DBWindowsAuth is extracted directly from the registry because its default value is not a string, whereas the values for DBName, DBPassword, DBServer, and DBUserId are extracted from the registry using the GetRegistryValue routine. Unlike Access connection strings, the routine attempts to substitute intelligent values in case the user hasn t supplied a default value. For instance, if the length of DBServer is zero, the program assumes that the user is running the query against the local computer. If the length of DBName isn t zero, the program attempts to build a partial connection string using DBName and DBServer. Then, if Windows authentication is used, Integrated Security=SSPI is appended to the connection string and the information in DBUserId and DBPassword is ignored. If DBWindowsAuth is False, the DBUserId and DBPassword are checked to see if they contain a value. If both contain information, these fields are appended to the connection string. If one of these fields doesn t have any information, c is set to the empty string, destroying the partial connection string that already exists. If the user selected Advanced on the DBInfo form, the ConnectionString value is extracted from the registry using the GetRegistryValue helper function. No further checking is required here because GetRegistryValue ensures that an empty string is returned if the default value is retrieved from the registry. Finally, the routine ends by returning the temporary variable c as the value of the function. The GetRegistryValue helper function calls the GetSetting function to retrieve the desired key from the registry. If the return value is the same as the supplied default value, the return value is set to the empty string.
Function GetRegistryValue(key As String, default As String) As String Dim r As String r = GetSetting("Excel2k3 VBA", "Query", key, default) If r = default Then r = "" End If GetRegistryValue = r End Function
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