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Microsoft-Access Tutorial

Soren Lauesen

E-mail: slauesen@itu.dk

Version 2.4b: July 2011

1. The hotel system...................................................4

2. Creating a database.............................................6

2.1 Create a database in Access.............................6

2.2 Create more tables .........................................10

2.3 Create relationships .......................................12

2.4 Look-up fields, enumeration type..................14

2.5 Dealing with trees and networks....................16

3. Access-based user interfaces.............................18

3.1 Forms and simple controls.............................18 3.1.1 Text box, label and command button......18

3.1.2 Adjusting the controls.............................20

3.1.3 Cleaning up the form..............................20

3.1.4 Shortcut keys for the user.......................22

3.1.5 Lines, checkbox, calendar.......................22

3.1.6 Combo box - enumeration type ..............24

3.1.7 Combo box - table look up .....................26

3.1.8 Control properties - text box...................28

3.2 Subforms........................................................30

3.2.1 Subform in Datasheet view.....................31

3.2.2 Adjust the subform .................................34

3.2.3 Mockup subform.....................................36

3.2.4 Subform in Form view............................36

3.2.5 Summary of subforms.............................38

3.2.6 Prefixes...................................................38

3.3 Bound, unbound and computed controls........40

3.3.1 Showing subform fields in the main form42

3.3.2 Variable colors - conditional formatting.42

3.4 Tab controls and option groups......................44

3.5 Menus............................................................46

3.5.1 Create a new menu bar............................46

3.5.2 Add commands to the menu list .............48

3.5.3 Attach the toolbar to a form....................48

3.5.4 Startup settings - hiding developer stuff.48

3.6 Control tips, messages, mockup prints ..........50

4. Queries - computed tables.................................52

4.1 Query: join two tables....................................52

4.2 SQL and how it works...................................54

4.3 Outer join.......................................................56

4.4 Aggregate query - Group By..........................58

4.5 Query a query, handling null values..............62

4.6 Query with user criteria .................................64

4.7 Bound main form and subform......................66

4.7.1 Editing a GROUP BY query...................67

5. Access through Visual Basic .............................68

5.1 The objects in Access ....................................68

5.2 Event procedures (for text box).....................72

5.2.1 More text box properties.........................72

5.2.2 Computed SQL and live search...............74

5.2.3 Composite search criteria........................76

5.2.4 Event sequence for text box....................78

5.3 Visual Basic tools...........................................80

5.4 Command buttons..........................................84

5.5 Forms .............................................................86

5.5.1 Open, close, and events...........................86

5.5.2 CRUD control in Forms..........................87

5.5.3 The OpenForm parameters......................89

5.5.4 Multi-purpose forms (hotel system)........90

5.5.5 Dialog boxes (modal dialog)...................92

5.5.6 Controlling record selection....................93

5.5.7 Column order, column hidden, etc..........94

5.5.8 Area selection, SelTop, etc......................94

5.5.9 Key preview............................................97

5.5.10 Error preview........................................97

5.5.11 Timer and loop breaking.......................98

5.5.12 Multiple form instances.........................99

5.5.13 Resize..................................................100

5.6 Record sets (DAO).......................................102

5.6.1 Programmed record updates..................102

5.6.2 How the record set works......................104

5.6.3 The bound record set in a Form ............106

5.6.4 Record set properties, survey................108

5.7 Modules and menu functions.......................110

5.7.1 Create a menu function.........................110

5.7.2 Define the menu item............................112

5.7.3 Managing modules and class modules..112

5.7.4 Global variables....................................114

6. Visual Basic reference......................................116

6.1 Statements....................................................116

6.2 Declarations .................................................120

6.3 Constants and addresses...............................122

6.4 Operators and conversion functions.............124

6.5 Other functions.............................................128 6.6 Display formats and regional settings..........132

7. Access and SQL................................................134

7.1 Action queries - CRUD with SQL ...............134

7.1.1 Temporary table for editing ..................134

7.2 UNION query...............................................136

7.3 Subqueries (EXISTS, IN, ANY, ALL . . .) ..138

7.4 Multiple join and matrix presentation..........140

7.5 Dynamic matrix presentation.......................142

7.6 Crosstab and matrix presentation.................144

8. References.........................................................148

Printing instructions

Print on A4 paper with 2-sided printing so that text and associated figures are on opposing pages.

Version 1: October 2004.

Version 2.1: November 2004. Changes:

a. Restructured section 3.2 with small additions. b. Section 7.1 on action queries added. c. Small changes and additions to Chapter 6 with corresponding changes in the

Reference Card.

d. Index provided

Version 2.2: April 2004. Changes:

a. SQL HAVING introduced in section 4.2 and the example in section 4.4. b. More on aggregate functions in section 4.4. c. ColumnOrder, ColumnWidth discussed in section 5.5.7. d. Selection of an area in the datasheet is discussed in section 5.5.8. e. Section 5.7 (action queries) now moved to Chapter 7. f. Action queries, Union, Subqueries, Crosstab, etc. discussed in Chapter 7 (a new chapter). g. Various small changes and improved explanations here and there.

Version 2.3: September 2006. Changes:

a. Access 2003 dialog when opening a database changed (page 8).

b. Look-up fields for foreign keys deleted (last part of section 2.4). Access's automatic creation of relationships caused too much confusion.

c. Combo boxes described in sections 3.1.6 and 3.1.7. d. More events explained in section 5.2.3. e. Various misprints corrected.

Version 2.4: August 2007 and July 2011. Changes:

a. Partial integrity (page 12). b. Adding a label to a control (page 20). c. DateTime Picker (page 22). d. More Null rules (page 62, 77, 124). e. Access data model and experiments improved (page 68-70). f. Composite search criteria, more computed SQL, date comparison (page 76-77). g. Event sequence for textbox: small corrections, e.g. OldValue (page 78). h. Improved area selection (page 95-96). i. Error handling, user errors (page 97-98). j. Timer and loop breaking (page 98-99). k. Managing modules and class modules (page 112). l. Error handling, VBA errors, Err object (page 117). m. Enum type (page 121). n. Partition operator (page 124). o. Week number in the Format function (page 126). p. Dynamic matrix simplified (page 136). q. Minor corrections and improvements in many places. r. Version 2.4a: Note on AutoNumber added to Figures 2.1C and 2.4. s. Version 2.4b: Copyright notice more liberal. Misprint corrected (page 65, step

14 and 15). Figure 52B (page 75) shows quote-stuff more clearly. SendKeys on

page 99 elaborated.

Permission is granted to use, print and copy the file on a non-profit basis as long as the source is clearly stated. The document is available on the author's web site on these conditions.

2 Preface

Preface

This booklet shows how to construct a complex appli- cation in Microsoft Access (MS-Access). We assume that the user interface has been designed already as a paper-based mockup (a prototype). How to design a good user interface is a separate story explained in User Interface Design - a Software Engineering Per- spective, by Soren Lauesen. After design, development continues with constructing the database, constructing the user interface, binding the user interface to the database, and finally develop the program. This is what this booklet is about. The reason we illustrate the construction process with MS-Access is that it is a widely available tool. Any- body who has Microsoft Office with MS-Word, also has Access and the programming language Visual Ba- sic behind Access. MS-Access is also a good illustration of many princi- ples that exist on other platforms too, for instance a re- lational database, a Graphical User Interface (GUI), event handling, and an object-oriented programming language. MS-Access contains all of these parts - co- operating reasonably smoothly.

Organization of the booklet

The chapters in the booklet are organized like this:

1. An introduction to the hotel system that is used as

an example throughout the booklet.

2. Creating a database. Construct a database that cor-

responds to the data model behind the design. The user will only see the database indirectly - through the screens we construct.

3. Access-based user interfaces. Construct the screens

and menus that the user will see. We follow the pa- per-based mockup designed in User Interface De- sign. You can use the result as a tool-based mockup.

4. Queries - computed tables. Connect the screens to

the database, usually by means of queries - com- puted data tables. The result will be a partially functional prototype.

5. Access through Visual Basic. Program what the

buttons and menus will do when the user activates them. The result will be a fully functional prototype and later the final system to be delivered to the customer. The first part of the chapter is tutorial - mandatory reading if you want to work with Visual

Basic and Access. The rest of the chapter is for

looking up various subjects. We assume you know a bit of programming already. 6. Visual Basic reference. A reference guide to the

Visual Basic language for Applications (VBA).

7. Access and SQL. An overview of the remaining

parts of SQL, for instance how to update the database through SQL. We also explain how to generate matrices of data with dynamically chan- ging headings.

Using the booklet for teaching

We have experimented with using the booklet for

teaching. First we tried to present part of the material with a projector, then let the students try it out on their own, next present some more, etc. Although the students listened carefully, it turned out to be a waste of time, partly because the students worked with vastly different pace.

Now we give a 15 minute introduction to the main

parts of Access: the database window, the tables, the forms - and how they relate to what they have learned in user interface design. Then the students work on their own. We have instructors to help them out when they get stuck.

The hotel system

We have chosen to illustrate the construction process with a hotel example, because most people have an idea what it is about, yet it is sufficiently complex to show typical solutions in larger systems. Some of the complexities are that a hotel has many types of rooms at different prices; a guest can book several rooms, maybe in overlapping periods; a room may need reno- vation or repair, making it unavailable for a period; the hotel keeps track of regular guests and their visits over time.

Simplifications

However, we have simplified the system in many other ways to shorten the discussion. For instance we ignore that in most hotels, rooms are not booked by room number, but by room type; hotels usually overbook, i.e. book more rooms than they have, expecting that some customers will not turn up. We also ignore all the other aspects of operating a hotel, for instance keeping track of when rooms are cleaned and ready for the next guest, purchasing goods, planning who is to be on duty for the next weeks, payroll and general accounting. In spite of these simplifications, the example still shows the structure of larger systems.

On-line resources

A demo-version of the hotel system, a VBA reference card, etc. are available from the authors's web site: www.itu.dk/people/slauesen.

Comments are welcome.

Soren Lauesen, slauesen@itu.dk

Preface 3

1. The hotel system

In this booklet we illustrate MS-Access by means of a system for supporting a hotel reception. The system is used as the main example in User Interface Design - a Software Engineering Perspective, by Soren Lauesen. If you know the book, skip this section and go straight to Chapter 2.

Screens

The hotel system consists of the screens shown in Fig- ure 1A. Find guest. The Find guest screen allows the recep- tionist to find a guest or a booking in the database. The receptionist may enter part of the guest name and click the Find guest button. The system then updates the lower part of the screen to show the guests or bookings that match. The receptionist may also find the guest by his phone number, room number, or stay number (also called booking number). The receptionist can select the guest from the list and click the buttons to see details of the booking or create a new booking for the guest. Room Selection. The Room Selection screen gives an overview of available rooms in a certain period. Avail- ability is shown as IN when the room is occupied,

BOO when it is booked, etc. The receptionist may

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