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...

Reading Permissions

As mentioned earlier, object permissions are stored in two main places the Permissions property of Document objects, and the Permissions property of Container objects, the latter being where the permissions for future objects are defined. But before you get too carried away with this new found knowledge, you might be interested to know that object permissions are stored in a Long Integer bit field. To get at individual permissions, you need to perform a bitwise operation, which is not very...

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 _...

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...

Record Finder Code

To make this code easy to implement, you want to reuse as much code as possible. The key is to pass references to the controls on this form the text box, buttons, even the form itself to a reusable Record Finder function. Note that this code has a ww prefix for Wiley-Wrox to reduce conflicts with any other public procedures. Option Compare Database Option Explicit 'Accepts references from a continuous form with Record Finder 'controls, finds the first next record containing the search 'text in...

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...

Easy Selection Criteria on an Index Form

Simple selections are the most common. Your user would like to narrow the recordset by selecting a criterion for a particular field. However, you also need to provide the capability to open the selection up again to include all records, as shown in Figure 15-2. First of all, the default selection criterion for a field is lt all gt . To include this in the drop-down list for your criteria combo box, you must use a UNION query. An easy way to understand a Union query is to think of it joining...

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...

All Objects Collection

Access contains a hidden collection called the AllObjects collection. Chances are you'll never use this collection directly, but it happens to be the parent object of several collections that are commonly used. These collections are Contains an object for each database diagram in a SQL Server database. Applies to ADP files only. Contains an object for each form in a database or project file. Contains an object for each user-defined function in a SQL Server database. Applies to ADP files only....

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...

Creating an MDW File

The first step in the wizard is to select or create the MDW file that will contain the group and user information to be defined in the database solution. As mentioned earlier, this can be a new file or the default file provided when Access is first used. The recommended approach is to always create a new MDW file for each database application and a custom Windows shortcut to invoke the application. This discourages Access users from accidentally locking themselves out of databases. The...

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...

Working with Data on Share Point

Working data on a SharePoint server can mean several different things. The options run the gamut from having the entire application on SharePoint, including the front end and forms, to just relying on data backup and revision management features. With the caveat that SharePoint can protect the data and enforce permissions, the following sections focus on two of the most common configurations. Publishing the data file to SharePoint but keeping the application on a local workstation could be...

Using Access Macros

As an alternative to using an expression, you can call an Access macro from the onAction callback. Using macros, you can create portions of the application that are available when the database is disabled. For more information about disabled mode, please see Chapter 22. To specify an Access macro, simply use the name of the macro in the onAction attribute, as shown in the following XML lt button id btnMacro label onAction macro You'll probably want to write most of your callbacks using VBA. As...

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...

Locals Window

Sometimes it can be utterly mind-numbing to test the value of every variable when your code enters break mode. If you're stepping through code and need to test the value of seven different variables every step of the way, that's a lot of Debug.Print statements to keep track of in the Immediate window. You can use the Locals window to display all the variables in a procedure and their values. You can watch the variable values change as you step through the code. To display the Locals window,...

Unsafe Actions

Following is a list of actions that are blocked in Disabled mode in Access 2007. If you run any of these actions, an error is displayed while the database is disabled. CopyDatabaseFile CopyObject DeleteObject Echo Nine safe actions are blocked when you set an action argument to a specific value. These are described in the following table. Any. When a filename is specified, this action becomes unsafe. See the list of commonly used RunCommand action arguments following this table. The following...

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...

Edit List Items

Users can now edit a value list or a combo box on-the-fly. How's that for adding flexibility and meeting a common need Just about every application has a combo box, and now you have an easy way to allow users to update them with you got it no code required. To allow users to edit or add new items to a value list, set property Allow Value List Edits to Yes. Users will see an Edit button when they are selecting an item from the list. Then, if they don't see what they want, they click the button...

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...

Access Share Point Tasks Template

Slightly more complex than the Contacts template, the Access SharePoint Tasks template enables the user to work with the standard SharePoint Tasks list and data in a simple Access database application. One of the major differences between the Tasks and the Contacts templates is that Tasks employs the User Information List as a lookup table for the Assigned To field in the list. That means the users of the SharePoint site can be assigned to the task, which, if configured for that list,...

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...

ADO Object Model Reference

When using VBA to access data in ODBC compliant databases, you can choose from DAO or ADO. To use either technique, you'll need to understand the object model for the appropriate technology. The ADO object model isn't overly complicated, but understanding the details of all the various ADO objects will help ensure that you use the proper object for the designated task. This appendix lists all of the major objects needed when using ADO to access data within VBA. For each of the major objects,...

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...

Open or Print Any File

The following procedure enables you to open or print any file, without your needing to know what its executable program is. For example, this same procedure can be used to open or print a Word or PDF document, an Excel spreadsheet, or an ASCII text file. It can even be used to generate e-mail with the default e-mail client if you use the mailto protocol followed by an e-mail address, or to open a Web page with the default Internet browser if you specify a Web address that includes the HTTP...

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...

How ACE and Jet Interact with ODBC Data Sources

Because ACE and Jet send information across the network to the data source, it's important to consider when and how much data is being transferred. The bandwidth of the network connections, load on the SQL Server, and amount of data being transferred across the network directly affect the performance of a client-server application. Before delving into the intricacies of how ACE and Jet deal with sending and retrieving data from SQL Server, consider employing the SQL Server Profiler to help...

Sub Form

Access provides great wizards for creating forms, including those with one or more subforms. Between the help files and wizard, it's pretty straightforward to create the relationships, queries, and forms with any combination of one-to-many-to-many relationships. Say a customer has several orders form-subform and each order can have multiple delivery dates form-subform with nested subform yep, the form wizard can even work with that. Everything seems peachy keen, right up until the subform's...

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...

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...

Encoding an MDB File

To enhance data security for MDB databases, the Access Connectivity Engine and Jet support data encoding for MDB files. As previously stated, encoding the data in the database obscures the data such that it will be much more difficult to decode the data in the database and the raw file data will not show plain text data in the database. However, encoding does not come without a cost. Aside from the initial cost of time to encode the entire database, performance when reading and writing data may...

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...

Form Object Events

Events are at the core of programming Windows applications. As such, there are a large number of events you'll use within your code behind forms. You probably will only use a handful of these events, but they are all available to you. A Form's events are summarized in the following table. When the form receives focus and becomes the active window. After the user confirms the delete and the records are actually deleted. After all elements in the PivotChart have been rendered. After all charts in...

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...

Linked Tables to Share Point

Linked Tables to SharePoint is probably the most commonly used SharePoint feature in Access database solutions. It provides the database with virtual tables, which update data on the specified SharePoint site, directly from within the database solution. The SharePoint ISAM provides the interface for Access to connect directly to SharePoint. SharePoint linked tables can be used just like native Access tables, except that the Schema cannot be modified in Access or through VBA code, and the actual...

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...

Importing from Share Point into an ACCDB

Fortunately, Access supports most of the data types that SharePoint 3.0 supports, such as Complex Data and Attachment fields. However, there are some differences about how data is imported for certain types of fields, such as Lookup or Person or Group type fields. Additionally, there are a number of fields that are not shown in either the Default View or the Column Settings page that are imported along with the rest of the fields in the list. When importing lists from SharePoint, it is...

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...

IsLoaded

There are numerous situations in which you might want to know if a form is open, or loaded. The following scenario will help illustrate when and why to use the IsLoaded property. In this situation, a user may have several forms open, including frmEvent, which lists the names of everyone scheduled to participate in an event. Say that one of the participants cancels, so the user opens a participant form and clicks a command button cmdCancel to remove that participant from the event. Because the...

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...