CS 200. Lecture 06. Database Introduction. Database Introduction. CS 200 Winter 2018

Transcription

1 CS 200 Lecture 06 1

2 Miscellaneous Notes Abbreviations aka also known as DBMS DataBase Management System mutatis mutantis with the necessary changes having been made 2

3 Please read and highlight BEFORE lab Assignment 6 This week s lecture slides Reading Database Design (on Learn > Database Resources > Database Design) Adapted from Access Database Design and Programming by Steven Roman Today Database basics and Design Creation of a database Reports and Queries Relationships Please ask questions! Administrativia 3

4 Assumptions You have used a database before You understand basic data management 4

5 Things to think about What are the data objects in FileMaker? How does the interface differ from other applications we have seen so far? What are the efficiencies and deficiencies of the interface? What are different databases you use? How are the databases you are part of used? Is the way data is displayed important? 5

6 Databases FileMaker This is your first pass at FileMaker. By the end of this section you will be able to: design a simple database create queries and reports understand database terminology and create relationships with a database Our objectives are to introduce you to database fundamentals Expose you to an application specific to database FileMaker 6

7 A collection of related data What is a Database? Data consists of information on a specific topic 7

8 What databases are you a part of? Use of Databases What are some of the benefits of belonging to a database? What are some of the drawbacks? Why/when do I use a database? How are the databases I am part of used? 8

9 FileMaker Terminology (1) File Table (Entity) Field (Attribute) Record 9

10 FileMaker Terminology (2) Layout Report Query 10

11 Consider the following example: Creation of a Table You would like to create a database with all of the Albums you have downloaded onto your ipod. What info would be relevant to have in a table? What types of fields will each of these be? 11

12 Creating a Database 12

13 Album Table Fields Field Name Album Title Album Type Medium Recording Year Label Purchase Price Album Artist Purchase Date 13

14 Album Table Field Types Field Name Album Title Album Type Medium Recording Year Label Purchase Price Album Artist Purchase Date Field Type Text Text Text Number Text Number Text Date 14

15 Album Table Field Definitions Field Name Field Type Options Album Title Album Type Medium Recording Year Label Purchase Price Album Artist Purchase Date Text Text Text Number Text Number Text Date Value List (TP, CD, LP, MP3) Value List (Jazz, Blues, Rock, ) Range ( ), Number Number Date 15

16 Creating A Database Creation of a new database is similar to other applications File: New Database 16

17 Creating a Table within our Database 17

18 Defining Fields 18

19 Data Validation 19

20 Data Validation in FileMaker (1) You can t mistype something that s entered for you! 20

21 An Important Principle: Data Validation in FileMaker (2) It s easier to catch & correct errors when data are entered than it is to find and correct them later 21

22 Uniquely Identifying Records Primary Key 22

23 Modes in FileMaker Browse Find Layout Preview 23

24 Browse Mode 24

25 Find Mode 25

26 Preview Mode 26

27 Layout Mode 27

28 Creating a New Layout 28

29 New Layout 2 29

30 New Layout 3 30

31 Organization of a Report Layout At the top of every page Header printed once on each page Repeated for Every Record BODY printed once for each group At the bottom of every page Footer printed once on each page 31

32 Formats in FileMaker Note especially the difference between how a data value appears on a form The Format menu... eg 3.14 and what s stored in the database eg & note the menu items that control the appearance of each data type 32

33 Songs Table More than one Table in a Database Song Table Song ID Song Title Side Track Mins Secs Song Album ID Primary Keys Foreign Key Album Table Album ID Album Title Album Type Medium Recording Year Label Purchase Price Album Artist Purchase Date 33

34 Creating a Relationship in FileMaker 34

35 Types of Relationships One to One One to Many Many to One Many to Many 35

36 Terminology Album ID is a primary key for the Album Table because it uniquely identifies an album is a foreign key of the Songs Table because it contains a primary key of the Album Table and thus links a Song record to a unique Album record One-to-many and many-to-one wrt Album ID Albums is the one table Songs is the many table because for a given Album ID there is only ONE Album record but are (usually) MANY Song records many-to-many can happen, too though not by matching a primary key in each of two tables! it is often useful we ll see an example next week 36 SQL

37 Displaying Info from a Many to One Relationship Field Tool in Layout Mode 37

38 Many to One (2) 38

39 One to Many Portal Tool 39

40 One to Many (2) 40

41 Creating Enhanced, Stylized Layouts 41

42 Things That Might Confuse You in FileMaker You can define as many layouts as you want these are also called views of the data (SQL-speak) give them meaningful names!!! You don t have to include all fields on all layouts defining a new field doesn t cause it to appear on all layouts by default, a new field is placed on the current layout, although there s a preference to prevent that In FileMaker data entry options are associated with a field s definition the appearance of a field is specified on the layout, and can vary other databases may choose different conventions 42