MS-Access Programming. Assit.Prof. Dr. Anantakul Intarapadung

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1 MS-Access Programming Assit.Prof. Dr. Anantakul Intarapadung 1

2 VBA? VBA (Visual Basic for Applications) is the programming language of MS-Access and other Office programs. 1 Create a Macro: With Excel VBA you can automate tasks in MS- Access by writing so called macros. In this chapter, learn how to create a simple macro. 2 MsgBox: The MsgBox is a dialog box in MS-Access VBA you can use to inform the users of your program. 3.Variables: This chapter teaches you how to declare, initialize and display a variable in MS-Access VBA. 4. If Then Statement: Use the If Then statement in MS-Access VBA to execute code lines if a specific condition is met. 2

3 VBA? 5. Loop: Looping is one of the most powerful programming techniques. A loop in MS-Access VBA enables you to loop through a range of cells with just a few codes lines. 6. Macro Errors: This chapter teaches you how to deal with macro errors in MS-Access. 7. String Manipulation: In this chapter, you'll find the most important functions to manipulate strings in MS-Access VBA. 8. Date and Time: Learn how to work with dates and times in MS-Access VBA. 9. Events: Events are actions performed by users which trigger MS-Access VBA to execute code. 10. Array: An array is a group of variables. In MS-Access VBA, you can refer to a specific variable (element) of an array by using the array name and the index number. 3

4 VBA? 13 Function and Sub: In MS-Access VBA, a function can return a value while a sub cannot. 14 Application Object: The mother of all objects is MS- Access itself. We call it the Application object. The application object gives access to a lot of MS-Access related options. 15 ActiveX Controls: Learn how to create ActiveX controls such as command buttons, text boxes, list boxes etc. 16 Userform: This chapter teaches you how to create an MS-Access VBA Userform. 4

5 Relational Database? 5

6 5 Major Components of Access Access Database Objects Tables Queries Forms Macros Modules 6

7 Tables Tables hold the information, called data 7

8 Tables - Data Types Text Use for text or combinations of text and numbers, such as addresses, or for numbers that do not require calculations, such as phone numbers or postal codes (255 characters) Memo Use for lengthy text and numbers, such as notes. Stores up to 63,999 characters Number Use for data to be included in mathematical calculations, except money Date/Time Use for dates and times Currency Use for currency values and to prevent rounding off during calculations. AutoNumber Use for unique sequential that are automatically inserted with a new record Yes/No Use for data that can be only one of two possible values, such as Yes/No, True/False, On/Off. OLE Object Use for OLE objects (such as Microsoft Word documents, Microsoft Excel spreadsheets, pictures, sounds, Hyperlink Use for hyperlinks (hyperlink: Colored and underlined text or a graphic that you click to go to a file, a location in a file, a Web page on the World Wide Web, or a Web page on an intranet. Stores up to 2048 characters. Lookup Wizard Use to create a field that allows you to choose a value from another table or from a list of values using a combo box 8

9 Table Encounter The prospect of creating multiple tables almost always intimidates beginning database users. Most often, beginners will want to create one huge table that contains all of the information they need, similar to an Excel spreadsheet. When thinking about which fields to add to a table, a good first guess is: What piece of information will only occur once? Such as A person will probably only have one first name, though it may change First_Name is a good candidate for the PI table A table needs at least on field that never duplicates in the same table Two or more people can have the same first, last and middle names A person may have more than one award (per name) The award title is not a good candidate for the PI table, since we don t know how many awards a person may have 9

10 Queries Queries select and modify specific data Queries convert data to information They are used to populate forms and reports MS Access uses a visual query wizard to help novice (and advanced!) users construct queries 10

11 Simple Queries From a Single Table Select Award_Title from Awards where (Award_Title Like Exploring* ) and (Closed = False) Order By Award_Date; 11

12 Simple Queries from Multiple Tables Set up relationships (Access may make you do this and if it does, will help you with a wizard) 12

13 Simple Queries from Multiple Tables SELECT PIs.[First Name], Awards.Award_Title, Awards.Award_Date, Awards.Closed FROM PIs INNER JOIN Awards ON PIs.ID = Awards.PI_ID; 13

14 Action Queries Queries can update, add or delete records from a table DELETE * FROM Pis WHERE (PIs.[First Name])="No Research"; 14

15 Forms 15

16 Properties What can a Control look like and how can it act? 16

17 Coding for Close Window with VB 17

18 Coding for Insert Data Window with VB 18

19 Coding for Delete Data Window with VB 19

20 Coding for Update Data Window with VB 20

21 Login Form 21

Unit 18 Database Design Extended Diploma in ICT DATA DICTIONARIES

Unit 18 Database Design Extended Diploma in ICT DATA DICTIONARIES Last time Modelling ERD a top down method of modelling the real life business Normalisation a bottom up method Often based on existing