Database and MySQL Temasek Polytechnic

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1 PHP5 Database and MySQL Temasek Polytechnic

2 Database Lightning Fast Intro Database Management Organizing information using computer as the primary storage device Database The place where data are stored Database Management For Microcomputers, Harrington, Dryden, Orlando 1994

3 Database Table All the information is organized in the form of a table Table Has a name Has attributes Specified as column names

4 Table An extremely simple bank account system Login Table ID Login Password Picture 1 andrew pass1 andrew.jpg 2 joe black joe.jpg 3 ian tampines mypic.jpg 4 john johndoe coolpic.jpg

5 Table The previous table has as a name Attributes:

6 Primary Key Primary key is used to uniquely identify each entry (row) In our table, is the Primary Key This uniquely identified each row

7 What are not covered Multiple tables Normalization Relationships

8 SQL Structured Query Language It s a language to retrieve, update, delete, and insert data into a database

9 Basic SQL commands CREATE Create a new table SELECT Retrieve data from database INSERT Insert new data into a database UPDATE Update or modify existing data DELETE Delete data from the database

10 Data Types Data Types What type of data your table can hold Size of data each column can hold Most commonly used VARCHAR(n) variable size string up to n size INT integer to DATE YYYY-MM-DD

11 CREATE! "# "$ %"& ' $ "! ( $)(*+*$, Descriptions: NOT NULL - column must have a value NULL column can be empty DEFAULT specify default value AUTO_INCREMENT automatically increasing number (integer) PRIMARY KEY Primary Key of the table to serve as unique identifier

12 CREATE Example! ""! ( -./01,,2

13 CREATE Example Creates the following table PID Name Persons The table is created, and is empty We ll look at how to populate this table in INSERT

14 The rest of SQL Consider the following table PID Name John Paul George Persons

15 SELECT 3 4-5$666 %!( - 5$666 7/ $!* 4-5$666$

16 SELECT example 3- %!( 38%!(7/ 9:; The first example gets all records The second example gets record that matched the WHERE clause The wildcard (*) means all attributes from the table

17 INSERT 3! ,$."3' 4-' 5666, 3! ,$ 3666

18 INSERT example 3!,."3:;, Insert a new data into the persons table The data Ringo is inserted into the name column ID is an AUTO_INCREMENT field, we ll let MySQL start a sequence and start incrementing from there NOTE: For AUTO_INCREMENT field there is no need to specify the value

19 DELETE %!( 7/$ WARNING: Technically WHERE is optional, but if it s left out the DELETE command will delete all records from the table

20 DELETE example %!( 7/ 9:<;! 9:=>; :;

21 UPDATE ") 349B4-59B5$666 7/$

22 UPDATE example ")3 9:(C; 7/95 Will replace Paul with Mick in the persons table If WHERE is not specified, all values from name attributes will be changed to Mick

23 Using MySQL Interface (1) Go to the bin directory of your MySQL installation Ex: cd C:\mysql\bin Type D At the MySQL prompt create the database (if you don t have one): 32 To check your databases: 3/!7332 To use the persondb database, type: "32

24 Using MySQL Interface (2) Create a table by using CREATE command Note: You must select a database before working with SQL

25 MySQL and PHP Using PHP you can connect and use MySQL Steps: (1) Open database connection (2) Select your database (3) Run the query (using SQL) (4) Fetch each row and process (5) Close the database connection (optional)

26 (1) Open database connection Connecting to database D>- -,2 Example: >A-

27 (2) Select your database Selecting database D -, Example: D@A,2

28 (3) Run the query Run your SQL query using PHP function DDD, Example:

29 (4) Fetch each row and process To fetch the result D&>, Example: >E 9D&> E,, E : ;$2!F Prints all the name from the previous slide SQL query

30 (5) Close the database connection This step is optional as the connection will be automatically closed when the script finish executing D, Example: DE,2

31 Complete Example: GH E 9 D@ >A-@A-@A,2 D@A,2 E9 DD@38%!( A,2 >E 9 D&> E,, E : ;$6@GIA2 D,2 HI

32 Loose Ends PHP has many more functions dealing with MySQL (see the manual) The drawback of the techniques used here is when the database is changed (say to Oracle), then the code must be changed (the code is MySQL specific) PHP PEAR library has DB module which allow cross-platform database access (not covered here requires advance PHP)

33 Conclusion Super quick intro to database Quick intro to SQL MySQL PHP and MySQL programming

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