Working with Data in Excel

A common scenario in any company is to communicate public data via charts, tables, and graphs through periodic reports. By allowing users to export data directly to Excel, you empower them to leverage the rich set of Excel features to create their own charts and tables at a whim, without having to modify the data or design of the architecture of your Access database solution. The first example here utilizes a form with a list box control that exposes Queries within the application. The Row...

The Smart Tag Object

All of Microsoft Office 2007 has the capability to use SmartTags. You can programmatically manipulate the SmartTag object by accessing its properties and methods. The properties of the SmartTag object are listed in the following table. Represents the currently active Access application. Returns true if the SmartTag isn't installed or isn't correctly installed. Refers to the parent object of the SmartTag. Returns the collection of all properties for a particular SmartTag. Returns the collection...

Forms as Objects

By now you should have a fair grasp on how to create classes and class objects in Access 2007. Something you might not be aware of is the fact that because form and report modules are also class modules, you can instantiate and use them in exactly the same way as any other class object. The greatest benefits of this are that you can create and operate on more than one instance of the object at any one time, and you can use its events by declaring their object variables using the WithEvents...

Creating Forms the

When you are ready to create a new form, you'll probably have a good idea about its general look and function based on the record source and purpose. Access 2007 gives developers a huge jump-start on form design by providing a good selection of form options on the Ribbon see Figure 10-1 . You can select an item from the Navigation pane, which will become the Record Source of the new form, and then click on one of the Ribbon's form buttons to initiate the process. Thanks to a form wizard, the...

Sending Information from Access to Excel

Access 2007 provides the capability to create forms and reports, which include graphs and tables. However, you may want to leverage some of the powerful Excel features, such as the new Charting and Conditional Formatting features new to Office 2007. Also, users may find it useful to be able to export their data in an Excel spreadsheet. The code samples for working with Excel can be found in the code behind the Export Report Manager form in the sample database. As with Outlook, using Excel...

Adding Editing and Deleting Rows

Not all recordsets are editable, and the same can be said about some rows. Snapshot recordsets are never editable, and user permissions and record locks can result in recordsets or individual rows that you cannot edit. In addition, joins in some recordsets that are based on multiple tables can render the entire recordset uneditable. The procedure for adding rows to a recordset is quite simple Open the recordset, issue the recordset's AddNew method, make the additions, and then issue the Update...

Reg NotifyChange KeyValue

Description Provides the mechanism to be notified when a Registry key or any of its Declaration Declare Function RegNotifyChangeKeyValue _ Lib advapi32.dll _ ByVal hKey As Long, _ ByVal bWatchSubtree As Long, _ ByVal dwNotifyFilter As Long, _ ByVal hEvent As Long, _ ByVal fAsynchronus As Long As Long Parameters hKey Long Integer The handle of the key to watch, or one of the lpWatchSubTree Long Integer Boolean flag that indicates whether to watch the subkeys for change. Zero Do not watch...

Event Properties Where Does the Code Go

The power of a form is often derived from responding to the user. Typically, a response is based on intentional input. But VBA can also respond to ancillary or inadvertent actions. The most common place to use code is in the event properties of the form or control. This is frequently referred to as the code behind the form. It isn't enough to have the code right the code also has to be behind the right event or it may not be triggered. Time and again, the problem of code that just doesn't work...

Late Binding

Another timing issue that can have significant impact on performance is whether the form is using early or late binding. Basically, this refers to when the record or recordset is created for a form or other object. Late binding typically involves filtering, which reduces the size of the recordset and also allows the developer greater control of the record source. When you add fields to your form, the text boxes that are created become bound text boxes. That is, the table or query fields are...

The Function to Get a Key Value

The GetKeyValue procedure wraps both RegOpenKeyEx and RegQueryValueEx functions, which open the subkey and retrieve its value, respectively. Again, after each function call, it checks if the call completed successfully, and if not, raises a custom error and returns a Null value. If the call does complete successfully, it returns the current value. Public Function GetKeyValue lngRootKey As w32Key, _ strSubKey As String, _ strValueName As String _ As Variant lngReturn RegOpenKeyEx lngRootKey,...

Basic Error Handling with an Extra Resume

One of the problems with basic error handling is that when an error does occur, you have no easy way of knowing the exact line that caused the error. After all, your procedure may have dozens or hundreds of lines of code. When you see the error message, the execution of your code has already jumped to your error handler routine and displayed the message box you may not be able to tell which line caused the problem. Many programmers rerun the code, using debug mode, to step through the code to...

Reg QueryReflection Key

Determines whether Registry reflection is enabled for the specified key. Requires Windows XP Professional x64 Edition or Windows Vista or later. Declare Function RegQueryReflectionKey _ Lib advapi32.dll _ ByVal hBase As Long, _ bIsReflectionDisabled As Long As Long hBase - Long Integer Handle to the Registry key to query. bIsReflectionDisabled - Long Integer A value that determines whether Registry reflection is enabled or disabled for the specified key. Long Integer Zero ERROR_SUCCESS on...

The Sub Report Object

Much like forms and subforms, reports can also contain subreports. The SubReport object has no methods, and its events are the same as the events for the SubForm object. The SubReport object has four properties, described in the following table. The SubReport object has four properties, described in the following table. Returns the currently active application object. Refers to the form associated with a SubReport object. Refers to the parent of the selected subform. Refers to the report...

Using SQL for Report Selection Criteria

Many developers build Access reports so that their users can quickly view and print out their data. Consider a report to list businesses from the database, as shown in Figure 15-6. Some reports are designed to show all the records in a table or query. However, your user will often want to print only some of the records, based on selection criteria. You can create a different report for each selection criteria, but that approach will result in duplication of report code and difficulty in...

Open with Access for Non Template Linked Lists

Using Open with Access for any SharePoint list types other than the Issue Tracking, Tasks, and Contacts lists and choosing linked tables will simply create new linked tables in a new database or, if chosen, an existing database. When completing this operation, the user always gets two lists the primary list from which the Open with Access option was invoked and the User Information List, which describes information about the users of the SharePoint site. These linked tables are standard...

ACCDR Runtime Files

Access 2007 will also support runtime mode. This locked down version limits users' access to commands and to make design changes. In the past, a command line switch would tell Access to open in runtime mode. With the new Jet and the ACCDB file format, switching to a runtime format is even easier, because all it requires is changing the file extension to .accdr. To return to the full-feature environment, merely change the file extension back to .accdb. Of course, this still requires either a...

Reg SetKey Value

Description Sets a value in the specified Registry key and subkey. Requires Windows Declaration ' String declaration of lpData Private Declare Function RegSetKeyValueString _ Lib advapi32.dll _ Alias RegSetKeyValueA _ ByVal hKey As Long, _ ByVal lpSubKey As String, _ ByVal lpValueName As String, _ ByVal dwType As Long, _ ByVal lpData As String, _ ByVal cbData As Long As Long ' Numeric declaration of lpData Private Declare Function RegSetKeyValueLong Lib advapi32.dll _ Alias RegSetKeyValueA _...

Creating Unbound Forms

It is usually easier to create a normal form and then convert it to an unbound form than it is to create an unbound form from scratch. When the form is bound, you can use built-in form design tools to drag-and-drop fields to build the forms to the desired layout. This technique minimizes the chance for misspelling a field name and decreases creation time. Once the controls for displaying the data have been added to the form, you can easily convert it to an unbound form by setting the Record...

Referencing a Library

When you set a reference to an external library in Access 2007, you can use its functions as though they were built-in to Access. You can reference type libraries, object libraries, and control libraries. For example, because the Microsoft Excel Object Library is itself a library of functions, you can reference link to it in Access and use its functions as though they were part of Access. To reference a library, select Tools O References in the Visual Basic Editor. The References dialog box...

Stepping Through Code

In most cases, you design code to run with little or no user intervention. However, when you're testing code, sometimes it is helpful to do more than insert a couple of breakpoints or include some Debug.Print statements. If you're running code with several variable changes or some intricate looping, it can sometimes be helpful to step through the code line by line. Doing this allows you to watch the value of variables after each line of code is executed. This can help you pinpoint any errors or...

The Database To Be Secured

The second component of user-level security is the database that is secured at the user-level by granting permissions to each object in that database. Permissions authorize the actions that can be taken on an object. They are granted to Access users based on the pass codes in the MDW file that are in use when user-level security is set up. An Access user does not use the MDW file until he opens a database. If no MDW file is explicitly specified, the default joined MDW file is used. However, the...

Setting Focus from Afar

To help the user use the Find routine efficiently, control the focus so that keystrokes make sense. For example, if the user clicks the First button and no match is found, you know that he's probably going to want to change the search phrase to something else. To help him, set the focus to the Search Text control MsgBox No matches found., vbOKOnly, Record Finder ctlSearchText.SetFocus Remember that this code is not in the form the user is viewing you are controlling focus from this procedure...

Know the Rules Program with Confidence

There's no need to feel intimidated by the API, despite the fact that it has the reputation of being highly complex. Because the Windows APIs are written in C C , VB programmers must be aware of certain rules, but other than that, the APIs can pretty much be used in the same way as any other function. For example, enter the following example into a standard module and run it For example, enter the following example into a standard module and run it Private Declare Function GetUserName _ Lib...

Get Setting

You can use the GetSetting function to retrieve a string value from a single Registry key that you have previously saved. It returns the value specified by the default argument if the key is empty or doesn't exist. GetSetting has the following syntax GetSetting appname, section, key, default Chapter 20 Working with the Win32 Registry are explained in the following table. A required string expression that contains the name of the application or project whose key is being sought. A required...

Customizing the Office Menu

As mentioned earlier, the Office menu is updated when you create a new Ribbon from scratch. In addition to the changes made by the Ribbon, you can also customize the Office menu to suit your needs. In Office 2007, the Office menu is intended for options that affect an entire document or application. To customize the Office Menu, use the officeMenu node, which is a child of the Ribbon node as shown below. lt customUI lt ribbon startFromScratch true gt lt officeMenu gt lt button idMso...

Sandbox Mode Limitations

Sandbox mode blocks VBA functions or commands that could be harmful to a computer. They're blocked by the Access database engine when they are executed from a SQL query or other expressions in controls, forms, reports, or macros. Here's a list of functions that are blocked when sandbox mode is enabled The Microsoft Knowledge Base has an excellent article that describes the sandbox mode as well as expressions that are blocked when the Sandbox is enabled at http support.microsoft.com kb 294698 ....

Handling Rounding Issues

Rounding problems are among the most difficult to understand and debug. They usually occur when adding up money values, but they can also happen in any math where a series of values is expected to add up correctly. One basic issue is not Access-related at all, but rather an issue whenever you add up a list of rounded numbers. For example, take a list of numbers that each represent one third of a dollar. If you add them up, you'll get 99 cents because the value of each portion .33333333 was...

Reg DisableReflection Key

Description Disables Registry reflection for the specified Registry key. Disabling reflection for a key does not affect reflection for any subkeys. Requires Windows XP Professional x64 Edition or Windows Vista. Declare Function RegDisableReflectionKey _ hBase - Long Integer Handle of the open key, or one of the hive con Long Integer Zero ERROR_SUCCESS on success. All other values are the specific error code.

Splitting a Database

Speaking of shared data files prompts a discussion of splitting the database, or moving the tables to their own file. It's not uncommon to initiate the database design with the tables in the same file as the other objects. And although it works fine to keep it that way for small, single-user applications, it isn't advisable for larger applications or for shared files. Although an application can allow simultaneous use by multiple users, that can lead to significant performance and corruption...

Creating Accdt Files

One of my favorite new features in Microsoft Access 2007 is the support for database templates, which allows you to create your own custom templates. The ADE provides a nice tool for creating a template using almost any existing database. Most features in the ACCDB file format are supported by the new ACCDT file format. Because everything in the application is contained in one physical file, deployment is no problem because it's all done through user input from the Getting Started window. You...

The Package Solution Wizard

The Package Solution Wizard is an extremely handy tool for building Access application installation programs. It creates a standard Microsoft Windows Installation package MSI file that can perform a number of useful setup tasks, such as deploying Access Runtime and developer-specified application files, adding Windows System Registry keys, and even including digital certificates for the client machine. Employing this wizard greatly reduces the cost and headache of building a streamlined setup...

Fixing Broken References

If your code suddenly stops working after you have installed your database on another computer, it's a good idea to inspect the references. One of the first things to check for is the MISSING referenced type library. As you can see in Figure B-5, MISSING stands out at the left of any missing type library. To fix the missing references, open the Visual Basic Editor's References dialog box and update the references. You typically run into two problems here. First, if you have delivered the...

Open with Access

New to Microsoft Office 2007, the Open with Access button is available on the Actions menu, now available in SharePoint 3.0 lists. The Open with Access feature enables the user to create a linked table to a SharePoint list or to simply import the list directly. Choosing Open with Access for specific types of SharePoint lists, Access will create a database application template based upon the SharePoint list. As you will see shortly, these templates provide a nice simple example of exactly how an...

Reg QueryValueEx

Description Retrieves both the type and the value for the specified key. This is a more sophisticated function that RegQueryValue, and is recommended for use on Win32. Declaration Declare Function RegQueryValueEx _ Lib advapi32.dll _ Alias RegQueryValueExA _ ByVal hKey As Long, _ ByVal lpValueName As String, _ ByVal lpReserved As Long, _ lpType As Long, _ lpData As Any, _ lpcbData As Long As Long Parameters hKey Long Integer Handle of an open key, or one of the hive con lpValueName String Name...

ACCDE and MDE Files

Access 2007 will create either an .mde or an .accde file, depending on which file type is open. Both files compile and lock down the code, so it cannot be viewed or modified. Any future changes have to be made to the originating .mdb or .accdb file and then a new .accde or .mde file will need to be created. Because the steps are essentially the same, this section will only provide the steps for creating an .accde file. It takes just six steps to create an ACCDE file in Office Access 2007. 1....

Using the Ribbon Schema

Startfromscratch True

The schema file for ribbon customizations is called customui.xsd. Using Visual Web Developer, the first thing to do is create a new XML file. Once the file is created, click the button in the Schemas property to open the Schemas dialog box. Click the Add button at the bottom of the dialog box to browse to the customui.xsd XML schema that is included in the 2007 Office System XML Schema Reference. Figure 12-2 shows the schema file added to the dialog box. Check the box for each schema you would...

Field Column History

Many of you have created a variety of techniques to track the changes to data stored in a field. Now, Access provides a built-in solution Column History. Column History is a new property on the Application object that uses an AppendOnly field property which must be set to True on memo fields to add new data with a date stamp. The data is actually stored as multiple entries in a separate table, so it can be filtered and sorted. The options for retrieving the Column History are limited, but it is...

Using VBA to Set Up Your Merge Document

Creating the mail merge using the Word Object Model really isn't that difficult, but it does require a little more code behind your form. Consider that automating the creation of the Mail merge document in Word through code may be easier and more practical for users because they won't have to create the merge document manually. The following code sample creates the merge document from a blank document, adds the merge fields, and finally, merges the data. Dim objWordApp As Word.Application Dim...

Stepping Through Your Code

Sometimes the only way to figure out a problem in your code is to actually run it line-by-line until you see where it goes wrong. You can use any of the preceding methods to stop your code, but there's nothing like getting your mind right into the logic by stepping through the code one line at a time. You step through code by selecting Debug O Step Into or pressing F8 . This debug command is the most common one to use because it's so basic. It runs the line of code that is highlighted, displays...

The Collection Object

You are familiar with using object collections VBA is full of them. The TableDefs and QueryDefs collections are examples you use almost every day. These collections maintain a list of pointers to the individual objects they control, in fact collection objects are also referred to as Controllers. To access an individual object within an object collection, you refer to its collection name and either the name of one of the objects it contains, or its ordinal position within the collection. For...

Sorting on Columns

Users often expect the capability to sort on columns, similar to other Windows applications such as Outlook and Excel. For example, if you have an index form of businesses, your user may want to sort on either the Business Name or Contact Name column, as shown in Figure 15-1. The two toggle buttons Business Name and Contact Name are in an option group control called optSort, which has an After Update event that contains the following code Private Sub optSort_AfterUpdate On Error GoTo...

Print Event

The Print event is fired after Access has finished formatting a section for printing, but before it is sent to the printer. The Print event handler is passed two parameters Cancel Set to True to cancel sending the section to the printer. PrintCount Reports how many times the Print event handler has been called for the section item. Typically, this is set to 1, meaning this call is the first time the handler has been called by the layout engine. The following code shows you how to accumulate...

DAO Field Types

The following table lists the constants in the DAO DataTypeEnum and their corresponding data types in the Access Table designer. Cannot create in Access, but can be used by linked tables Cannot create in Access designer but can be created in DAO Cannot create in Access, but can be used by linked tables Cannot create in DAO but can create in Access designer Cannot create in DAO but can create in Access designer Cannot create in Access, but can be used by linked tables Cannot create in Access,...

Launching and Using the Registry Editor

You won't find the Registry Editor on the Start menu because it's not something that Microsoft wants the average user to fool around with. The only way to launch it is via the Run dialog box. Here's how 1. Click the Start button and select Run, or press the key combination Windows R. The Run dialog box displays. 2. Type regedit or regedt32, and then click OK. The Registry Editor opens. To launch the 32-bit version of RegEdit.exe on x64-based versions of Windows, type windir SYSWOW64 regedit in...

Reg CopyTree

Description Copies values and subkeys from the specified key to the specified desti nation key. Requires Windows Vista and administrator privileges to copy the key. Private Declare Function RegCopyTree _ Lib advapi32.dll Alias RegCopyTreeA _ ByVal hKeySrc As Long, _ ByVal lpSubKey As String, _ ByVal hKeyDest As Long As Long hKeySrc - Long Integer Handle of the open key, or one of the hive constants listed earlier. lpSubKey - String Name of a subkey to copy under the key specified by hKeySrc....

Creating a Query Def

To create a QueryDef, execute the CreateQueryDef method against the Database object. In Microsoft Access workspaces, if you set a QueryDef's Name property to something other than a zero-length string, it is automatically appended to the QueryDefs collection, and saved to disk. Omitting the Name property, or explicitly setting it to a zero-length string, results in a temporary unsaved QueryDef. The following code demonstrates how to create a QueryDef in a Microsoft Access workspace Public Sub...

How Microsoft Access Resolves VBA References

When Access needs to use the file you've referenced, it does so in the following sequence 1. It checks the location indicated in the References dialog box. 2. It checks to see if the file is already loaded. 3. It checks the RefLibPaths Registry key for a value in the name of the referenced file. 4. If the RefLibPaths key does not exist, or doesn't contain the required value, Access checks the Search Path in the following order a. Application folder where msaccess.exe is located C. System folder...

Share Point Linked Tables in an ACCDB

The ACCDB file format has improved Linked Tables To SharePoint to an unmatched level of support compared to any other database product. Linked tables in Access support all SharePoint data types, including multiple value fields, attachment fields, append-only fields, and rich text fields. Probably the biggest difference between importing and linking tables to SharePoint lists is that all Lookup tables are automatically created as linked tables when the primary linked table is created....

Recordset Object

The Recordset2 object represents the records in a base table, or those that result from executing a query. The Recordset2 object was added in Access 2007 to support multi-valued lookup fields and attachment fields. Begins a recordset editing session that creates a new record for an updatable Recordset object. Cancels any pending updates for a Recordset object. Creates a new Recordset object that is a duplicate of the original Recordset object. Creates a new QueryDef object that is a copy of the...

Creating Custom Class Events

You can, of course, create your own events. Once you've decided on the specific events you want to expose, you declare them in the class's declarations section. Let's say you have a class called clsTest that implements a test given by the teacher. You may want to provide events that notify your code before and after a test is given. Events are declared Public by default, but for clarity, you might want to explicitly declare scope. In any case, nothing outside the class would ever know about an...

Linking to External Data

Select Data Source Access 2007

Access 2007 supports connecting to a wide variety of different types of data sources although some are read-only, many are fully updatable from an Access application. This is because different data source types use separate, but distinct methods to connect to the data. Indexed Sequential Access Method ISAM drivers are generally used for connecting to other desktop or file-based data sources, such as Excel, text, and HTML. On the other hand, Open Database Connectivity ODBC data source vendors...

Security for the Accdb File Format

One of the new features of Microsoft Office Access 2007 is a file format ACCDB. The security features available for it are somewhat different than those provided for the MDB file formats in a number of ways. This section discusses the security available for ACCDB files. The five different forms of database security for the ACCDB file format are as follows Shared-Level Security There is one simple form of shared-level security provided by the Access Connectivity Engine for ACCDB Encrypt Database...

Digital Signatures and Certificates

As you now know, databases with digital signatures are exceptions to the macro setting checks. That is, if a database is digitally signed, it can be opened regardless of the macro setting. Before you tackle creating and using digital signatures, however, let's briefly review ACCDB files. Access 2007 introduces a new file format called ACCDB. These files include additional features for the Access database engine and are the default file format created in Access 2007, but they do not support...

Debugging VBA

No matter how skilled you are there are times when you need help figuring out what the code is actually doing. Fortunately, VBA provides a rich and powerful debugging environment. You can stop the code at various times and for various reasons, view values of variables and even change them , and step through your code line-by-line until you understand what's going on. The main reason you need to debug your code is because Access has displayed an error message....

Responding to Events

Now that you know how to create custom events in your object, you might want to know how to listen and respond to them in your code. It's actually quite simple. All you need to do is declare the object variable using the WithEvents keyword. Unfortunately, however, you can only use WithEvents for object variables declared at module-level and only in class modules. Remember that the code behind forms and reports are class modules too, so you can also use the WithEvents keyword in forms. The...

Application Object Methods

The following table lists all of the methods available from the Application object. Any arguments for the methods are also listed. For example, you can use the CompactRepair method of the Application object with the following code Application.CompactRepair C DB Samples.mdb, Returns the error message associated with an Access or DAO error number. Adds the name of the current database as a hyperlink address to the Favorites folder. Returns a parsed criteria string as it would appear in the query...

Adding Controls

There is a wide range of controls that you can use in your customizations. Because you've already examined tabs and groups, the XML that follows only describes the controls. To use these controls in the Ribbon you need to include tab and group nodes in addition to the customUl and ribbon nodes. The solutions that you build later in this chapter will use these controls, including two of the more interesting controls galleries and dynamic menus. A menu control is a container for other types of...

Argument Description

Go to Determines how errors are propagated by an action Next Moves to the next line in the macro. This is similar to On Error Resume Next. Macro Name Jumps to the named macro. Fail Aborts the macro and throws the macro error. Macro name Name of a macro in the current macro group that handles errors. Single step was available in macros in previous versions of Access but has been added as an action in Access 2007. By using the SingleStep action, you can conditionally step through macros using the...

Reg GetValue

Description Retrieves the data and type for the specified value in the Registry Requires Windows XP Professional x64 Edition or Windows Vista. Declaration ' String declaration for pvData Private Declare Function RegGetValueString _ Lib advapi32.dll _ Alias RegGetValueA _ ByVal hkey As Long, _ ByVal lpSubKey As String, _ ByVal lpValue As String, _ ByVal dwFlags As Long, _ pdwType As Long, _ ByVal pvData As String, _ pcbData As Long As Long ' Numeric declaration for pvData Private Declare...

Alternating Row Color

Alternating row color is another coding challenge turned property. And yes, it is now that easy to display alternating row colors. You can set the controls for the datasheet as well as for repeating sections. In a table, the control is conveniently located with the font options. Click the control, and select from the array of color swatches displayed in the standard color pallet or choose More Colors and select whatever you want from the gradient scale. Figure 3-6 shows the color pallet with...

Using the Column History Method

The ColumnHistory method is a member of the Application object. It enables you to retrieve the full data history for an Append Only field. The AppendOnly field property is available only for the Memo data type and can be set to True in the table properties. The ColumnHistory method takes three parameters TableName, ColumnName, and QueryString, each of which is required. TableName obviously takes the name of the table that contains the Append Only field and the Column-Name is the name of the...

Compiling the Database into an MDE file

The predecessor of the ACCDE compiled database solution was the MDE file format. The MDE and ACCDE file formats are essentially the same from a compiled code standpoint. The VBA code in the database is compiled to a binary format and the source code is removed from the VBA project in both cases. However, the ACCDE format supports the database features in the ACCDB file format and the MDE file format is used to support the legacy MDB file formats. For example, an ACCDE file supports Attachment...

Reg EnableReflection Key

Description Enables Registry reflection for the specified Registry key. Restoring Registry reflection does not restore reflection on any subkeys. Requires Windows XP Professional x64 Edition or Windows Vista. Declaration Declare Function RegEnableReflectionKey _ Lib advapi32.dll _ ByVal hBase As Long As Long Parameter hBase - Long Integer Handle of the open key, or one of the hive con Return value Long Integer Zero ERROR_SUCCESS on success. All other values are the specific error code....

Record Count

Given its name, you might assume that the RecordCount property actually indicates the number of records returned by a recordset. That assumption is not quite accurate. Recordsets do not always return their entire dataset immediately they can take quite some time to populate the more rows they have to return, the longer they take. DAO returns a pointer to the recordset early, so you can get on with doing whatever it is you want to do, assuming that the later rows will have been returned by the...

Converting a Replicated Database

Replication is not supported in the ACCDB file format. Instead, a more powerful and versatile alternative is offered using SharePoint services. Because Access 2007 will work with replicated Access 2000 and 2002-2003 .mdb files, there's no need to convert the files to essentially maintain a status quo. In some cases, however, the benefits of converting to the ACCDB file format will outweigh the benefits derived from replication. The following outlines the process for essentially creating a new...

Maintaining Users and User Passwords with ADO

The next three procedures demonstrate techniques for adding a user AddUserADO , dropping a user DropUserADO , and setting a user password AlterUserPasswordADO . When a user is added, the Personal ID must be specified. The AddUserADO procedure automatically adds the user to the group Users with a call to AddUserToGroup function. This keeps the MDW file consistent with the ACE Jet database engine rule requiring that all users belong to the Users group. As with groups, the ADO code to add users is...

The Accdr File Format

The ACCDR file format is nothing more than a renamed ACCDB file format. If a .accdb database file extension is changed to .accdr, any time the database is opened, the Access Runtime will open the database solution. Although switching the extension for an MDB to ACCDR may work in most cases, it is not guaranteed to work in all cases. When using the ACCDR extension for MDB file format database, it is always best to test the solution to make sure that it is working correctly. Renaming a database...

Using the Excel OM to Create a New Workbook

To create a new worksheet in Excel, you will build the code in a few steps. To start you create an Excel application object. Then, you create a new worksheet object, as shown in the following code 'Create the Excel Application object Set xlApp Set xlWorkbook xlApp.Workbooks.Add After creating the new worksheet, you'll want fill that worksheet with data. The next example uses a Recordset object from DAO, see Chapter 6 to gather the data from an Access query in the database. The Recordset object...

The Database Folder

The Database folder is where most of the database settings and properties are stored. It has five objects four XML files and the objects folder. These XML files describe the database properties, VBA project references, the table relationships, and the Navigation pane settings. The objects folder contains the rest of the information about the template, which will be discussed in depth a little later in this chapter. The following sections describe each of the XML files in detail. The...

The Find Methods

There are four Find methods FindFirst, FindPrevious, FindNext, and FindLast. Their purpose is self-evident, given their names, and you can use them on all recordset types. Because the Find methods enable you to specify any field in the criteria, they may not be capable of using a table's indexes to execute a search. Compare this to the Seek method, which always uses a table's indexes to execute the search. Without an indexed field, the Find methods can just as easily use a table scan to find...

The Application Object

All of the Access objects you'll manipulate within code are children of the Application object, which is the parent object for all objects and collections in the Access object model. Every object and collection is related to the Application object through either a direct parent child relationship or multiple parent child relationships. Figure G-1 shows the Access objects and collections that are the direct children of the Application object. The Office 12.0 object library exposes objects from...

Attachment Field Type

The attachment feature gives developers the opportunity to offer compact and portable solutions to a wide new market. No more trying to keep track of files and update hyperlinks when files are moved or deleted. Using the attachment field type automatically compresses the file and stores it in the database. Multiple files and file types resum s as Word documents, some JPG photos, an Excel spreadsheet, or even a PowerPoint file can be stored in a single field or record. Access actually creates...

But First a Few Terms

You've seen some good cases for using managed code, but before we get into the details of using it with Access, take a look at the following terms, which are commonly used when referring to managed code Assembly A versioned piece of compiled managed code. Code that you write is usually compiled into a single-file assembly such as a DLL or EXE. Assemblies are also self-describing using a technique known as reflection. They are said to be self-describing because they contain metadata that...

Creating a Ribbon from Scratch

In this second scenario, you'll design a ribbon customization for an application to be used in a travel agency. The application provides tools that are useful for someone working in a travel agency, and the users are not concerned with building databases. As such, the goal for this application is to provide a more off-the-shelf experience. As with any application of this nature, your Ribbon should replace the Access Ribbon. By now, the techniques for building the Ribbon should be familiar....

Creating a Progress Meter Report

Progress meter reports are an interesting way to display status as a percentage of a given value. In the conference application, for example, you could ask the attendees to rate each session on a scale of one to ten, and enter the data in a table called tblSessionRatings. Aggregate the data using the following query SELECT tblSessionRatings.Session, tblSessions.Title, CDate CLng Start Time AS SessionDate, Avg tblSessionRatings.Rating AS AvgOfRating RIGHT JOIN tblSessionRatings ON GROUP BY...

Windows Registry Data Types

In the same way that database table fields, variables, and API parameters require data of specific types, the kind of data the Registry can store is also defined in terms of data types. The data types in the table that follows are supported under Windows 2000, Windows XP, and Windows Vista. Specifies raw binary data. Most hardware information is stored with this data type, which can be displayed and entered in binary or hexadecimal format. A 32-bit 4-byte number, which is used to store Boolean...

Class Libraries

When you write a class library using managed code, Visual Studio creates a DLL for you that contains the classes you have defined. However, the DLL is actually an assembly managed by the CLR. Because the DLL contains managed code, referencing it in Access produces an error, as shown in Figure C-1. Instead, the .NET Framework allows you to create a type library that you can reference from VBA. These type libraries are compatible with COM applications such as Access. If you want to extend your...

The Current Project Object

The CurrentProject object represents the Access project for the database or project that is currently open in Access. The Access project consists of the non-data items such as Forms, Reports, Macros, and Modules. The CurrentProject object has several collections and a number of properties you can use within your application. Here are descriptions of those properties Returns a reference to the currently active ADO Connection object. Returns a reference to the AllForms collection and its...

The Seek Method

The Seek method is the fastest way to find a specific record, but it can be used only on table-type recordsets because it specifically relies on the table's indexes. Naturally, the table must have at least one index for it to search on. Trying to call Seek against a non-table-type recordset will earn you a runtime error. Seek uses the following syntax rst.Seek comparison, keyl, key2. . .key13 To use Seek, you must specify three things the name of the index to use you can specify only one index...

Managed Code and Access Addins

Changes have been made to the Access 2007 Primary Interop Assembly PIA that enable you to listen for events in managed code and respond to them. You also have the option of enhancing your Access applications with add-ins and smart panes based on managed Microsoft .NET code. This could be as little as adding a custom button to the Ribbon to open a custom browse tool that makes it easier for users to store files on the correct network server. The PIAs for Access, DAO, and Office enable managed...

Multiple Form Instances

There are situations in which the user needs to compare two or more records from the same table. For example, you may need to compare Order 1 to Order 2 or Supplier1 to Supplier 2 or Supplier1 to Supplier2 and to Supplier3. This can be accomplished by opening the same form multiple times. Let's say a database consultant is creating an Access solution for a client. The consultant is in a bind and needs to subcontract parts of the project to one of her fellow developers. She checks her database...

Saving Email Addresses Using Textbox After Update Event

Access 2007 is smarter about the way it stores website and e-mail addresses. Data in a hyperlink field is automatically evaluated and tagged. The value is tagged with http for websites or mailto for e-mail addresses. In previous versions, the Hyperlink data type stored e-mail addresses as Web addresses http customeremail msn.com, for example , so when you clicked the link, it opened Internet Explorer and tried to find the website not at all helpful. One way to fix this is to right-click the...

The DoCmd Object

In many regards, the DoCmd object is the workhorse of the Access object model. It carries out tasks such as exporting objects to different formats, opening objects, and manipulating the size of the Access window. It has no properties, but it does have a variety of methods you can utilize within your Access application. All of the methods carry out an action with the same name as the method, so the following table provides descriptions of those actions, rather than of the methods which merely...

Setting Encryption Options

When you encrypt a database, the encryption is performed by calling into a Cryptographic Service Provider CSP that is registered by Windows. The CSP uses a specified encryption algorithm and key length to encrypt the specified data. For additional information about database encryption, please refer to Chapter 18. By default, Access uses Microsoft Base Cryptographic Provider v1.0 for database encryption. The default encryption algorithm is RC4. These options can be changed in DAO by executing...

Creating Tables

Tables are the backbone of any database. Because they store all of the data, designing them correctly the first time is crucial. The type of data you need to store in any given table is dictated by its purpose in the application. For example, if you need to store the date on which some event occurred, you would use a Date Time field data type. You could use a Text field type to store a date and there may be cases where that makes sense, but most of the time, the Date Time type will be more...

COM Addins

The Office Developer Edition for Office 2000 and Office XP allowed you to create COM add-ins using the Visual Basic Editor. This functionality remains in Visual Studio 2005. The Express Editions of Visual Studio do not include the required project type to create COM add-ins. COM add-ins offer several additional features over a class library They enable you to run code when Access starts. They enable you to run code when Access shuts down. A COM add-in is given an instance of the Access...

More Ribbon Tips

Here are a few tips to keep for writing ribbon customizations. They can help you in creating your applications, as well as in providing additional polish to your solutions. Prevent the Ribbon from loading You want to prevent the Ribbon from loading when testing or developing. For instance, when you are developing a Ribbon from scratch but you are also developing forms and reports. With a custom ribbon, the form design tools are not available. You can hold down the Shift key as you would to...

Using the ADE Tools

The Access Developer Extensions ADE is a combination of tools designed to aid in the development of Access applications. If you've used the ADE tools in the past, you'll be glad to hear that there are some new features for Access 2007. This chapter examines the ADE tools, shows you how to use them, and discusses how using the ADE can improve Access applications. The ADE package contains several tools for application development and deployment, including the following The Access Redistributable...

Public or Private

Another decision that you have to make when you create procedures is whether to make them Public or Private. By default, Access makes procedures you create Public, but that's not necessarily what you want. If you are working in a standalone module those that appear in the Modules area of the Access Navigation pane , the rules are a little different than if you are working in code that resides in a form or report. Forms and reports are intrinsically encapsulated as class modules, so their Public...

The Replace OrderByClause and Replace WhereClause Functions

It's often necessary to cut and replace the Where and Order By clauses of a SQL string using VBA. Throughout this chapter, the ReplaceWhereClause and ReplaceOrderByClause functions are used to do that. This section shows you the code that's been doing all that hard work This first procedure ParseSQL does the heavy lifting of the SQL handling functions. It breaks up the original SQL string into components, so that individual pieces can be replaced. Although ParseSQL is Public, it's rarely called...

Writing Code Behind Forms and Reports

Before you dive head first into VBA, you might want to get your feet wet by writing some basic code in a form. Every object on a form has a number of events you can respond to through VBA. Most objects or controls have a click event, a change event, and enter and exit events, just to name a few. You can add code to any of these events and that code will run in response to a user's actions on your form. Open an Access database and view a form in design mode. To build code in response to the...

A

AbsolutePage property, 209-210 AbsolutePosition property, 168, 209-210 ACCDB. See Access Database file format ACCDE. See Access Compiled Database file format ACCDR. See Access Database Runtime file format ACCDT. See Access Database Template file ACE, 52-55 data types, 9-10 database objects, 8 deprecations in, 65-66, 788-789 DAPs, 65 Import RunCommand, 65 legacy export and import formats, 66 Snapshot Viewer, 66 external data sources, 59-60 Excel, 59 Outlook, 59-60 SQL Server, 35-36, 60 features...

New Attachment Controls

In addition to being a new field data type, the attachment is also one of the new controls that can be found in the Toolbox. The Attachment control enables you to attach a file or collection of files to any record. When you right-click the control, a toolbar provides forward and backward buttons to cycle through the files and a paperclip button that opens the Attachment dialog box. That sounds fairly straightforward, but as a developer, you will likely want to provide a more elegant solution by...

Reg Editexe

Prior to Windows NT, regedit.exe was a 16-bit application for editing the Registry on 16-bit Windows platforms. It was originally included in Windows NT and 2000 for backward compatibility, but because of its limited functionality in the 32-bit environment, Microsoft recommends that you use regedit.exe only for its search capabilities on Windows NT 4.0 and Windows 2000. There is no limited functionality in regedit.exe on Windows XP, Windows Server 2003, or Windows Vista. On x64-based versions...

Creating a Workspace

If you have Microsoft Jet databases that use Jet security to help secure objects, there may be times when you need to provide access to them from unsecured databases. For such an occasion, you can create a new Workspace object to provide the username and password for the secured database. When you first refer to a Workspace object, or one of its collections, objects, methods, or properties, you automatically create the default workspace, which can be referenced using the following syntaxes The...

Data Type Description

Attachment A field type to store a collection of files for a given record. Stored as a complex data field, the complex scalar fields expose three pieces of data File Name, File Data the file itself , and the File Type. Stored as a complex lookup into a hidden complex scalar table. Stored as 4-byte integer that is assigned automatically when the record is created. Can be assigned as consecutive or random values. If the AutoNumber is a Replication ID, it is stored as a 16-byte GUID, instead of an...

Sample Setup Code Using ADO

The following procedure RunSampleADO shows various ways to call the previous ADO procedures. Comments have been embedded in the code to explain how it works. ' Add a user with a Personal ID and Password AddUserADO Userl, UserlID, UserlPass ' If you don't know the Password, specify the empty string AlterUserPasswordADO Userl, NewPass, ' Give the user the usual permissions but don't allow INSERT ' Prefer not to do this. But show as a sample anyway. GrantPermissionsOnTableADO Userl, tblTablel,...

Working with Share Point

The fastest growing business software product in the Microsoft family, Windows SharePoint Services is one of the hottest technologies for digital team site management available today. Flexible and easy to use, SharePoint provides users with simple site creation and design, robust content management, and powerful security for business data. Microsoft Office 2007 contains a myriad of new features that integrate with SharePoint to help users communicate information, and one of the pillars of the...

Registry API Constant and User Defined Type Declarations

To help you with this book, and so that you won't have to go searching for them, the following is a list of all the Constant and User-Defined Type declarations you'll need when using the Registry APIs. Const HKEY_CLASSES_ROOT As Long amp H80000000 Const HKEY_CURRENT_CONFIG As Long amp H80000005 Const HKEY_CURRENT_USER As Long amp H80000001 Const HKEY_DYN_DATA As Long amp H80000006 Const HKEY_LOCAL_MACHINE As Long amp H80000002 Const HKEY_PERF_ROOT As Long HKEY_LOCAL_MACHINE Const...

Combo Boxes

The combo box is a potent control that can combine the processes to search, select, and populate data into fields or other objects , as well as limit the values that a user may enter. Many nuances affect how combo boxes work this section addresses some of the more common ones. It also covers some new features, including two new properties Allow Value List Edits and List Items Edit Form. The combo box and list box have a lot of the same properties and functionality. The primary difference is...