PHP - Getting good with MySQL part I

1
Internet Programming
Database(SQL and MySQL)

2
Objectives
To understand the relational database model.
queries database using SQL (Structured Query
Language).
To understand the MySQL database server.
To learn various database interfaces.

3
Introduction
Database
 An integrated collection of data
Database Management System (DBMS)
 Provides mechanism for storing and organizing data
in a manner that is consistent with the database’s
format.
The most popular database systems are
relational database
 Use a language called SQL (Structured Query
Language)

4
Introduction
Popular database systems
 Microsoft SQL Server, OracleTM
, SybaseTM
InformixTM
andMySQLTM.
An interface
 Software that facilitates communication
between a database management system
and a program.
 Examples: Perl DBI for Perl, DB-API for
Python and dbx module for PHP.

5
Relational Database Model
A logical presentation of data.
Allows relationships among items of the
data.
Does not concern about the physical
structure of the data.
Is composed of tables
 Tables are composed of rows and columns
 Has primary key for referencing data

6
Database
Student_Record
Table : Student_Details
Table : Score
Table : Medical
Table : Activities

7
stud_ID stud_name age cgpa
1111 Lily 19 3.40
2222 Kim 18 2.75
3333 Ali 21 3.00
Database Name: Student_Record
Table Name: Score
Primary key
A major strength of the relational model:
supports simple, powerful querying of data.

8
SQL (Structured Query Language)
Developed by IBM in the 1970s.
Two Categories of SQL Statement.
1. Data manipulation
• SELECT, INSERT, DELETE
2. Data definition
• CREATE DATABASE, DROP DATABASE
• CREATE TABLE, DROP TABLE

9
Basic SELECT Query
SELECT column_name
FROM table_name
WHERE condition;
Select all columns from a table
 SELECT * FROM table_name
 SELECT * FROM Score
Select specific column(s) from a table
 SELECT student_name FROM Score
 SELECT student_name, age FROM Score

10
Basic SELECT Query
Specify the selection criteria for the query.
 SELECT student_id, cgpa
FROM Score
WHERE age > 18;
Use pattern matching to search for similar
strings
FROM Score
WHERE student_name LIKE ‘K*’;

11
Basic SELECT Query
Use pattern matching to search for strings in which
exactly ONE character takes the selected
character(?) place
FROM Score
WHERE student_name LIKE ‘?i*’; 2nd
letter
Arrange in ascending or descending order
 SELECT column_name1, column_name2,…
FROM table_name
ORDER BY column_name ASC;

12
Basic SELECT Query
Arrange in ascending or descending order
 SELECT column_name1, column_name2,…
FROM table_name
ORDER BY column_name DESC;
 SELECT student_ID, student_name, cgpa
FROM Score
ORDER BY student_name DESC;

13
Basic SELECT Query
Arrange rows in ascending order by multiple
columns
 SELECT column_name1, column_name2,...
FROM table_name
ORDER BY column_name1 SortingOrder1,
column_name2 SortingOrder2,... ;
 SELECT student_ID, student_name, cgpa
FROM Score
ORDER BY student_name, age

14
Use SELECT to join tables
Use an INNER JOIN to merge rows from
two or more tables by testing for matching
values.
 SELECT column_name1, column_name2,...
FROM table_name1
INNER JOIN table_name2
ON table_name1.column_name =
table_name2.column_name;

15
 SELECT student_name, blood_group,...
FROM Score
INNER JOIN Medical
ON Score.student_ID = Medical.student_ID
ORDER BY student_name;
The query combines the student_name and cgpa
columns from table Score and column
blood_group from table Medical, sorting the result
in ascending order by student_name

16
SELECT table_name1.colx,
table_name2.coly...
FROM table_name1, table_name2
WHERE condition;
SELECT Score.student_name, Score.cgpa,
Medical.blood_group
FROM Score, Medical
WHERE Score.student_ID = Medical.student_ID;

17
SQL Statement: INSERT
INSERT INTO table_name
(col1, col2, col3, ...)
VALUES
(‘text1’,’text2’...,num1,…);
INSERT INTO Score (student_id, cgpa)
VALUES(4444, 3.5);
INSERT INTO Score
VALUES(4444,’John’,19,3.5);

18
SQL Statement: DELETE
DELETE FROM table_name
WHERE condition;
 DELETE FROM Score
WHERE student_name=‘Lily’;

19
SQL Statement: UPDATE
UPDATE table_name
SET column_name1 = value1,
column_name2 = value2,
…
WHERE criteria;
UPDATE Score
SET student_name = ‘Kimchi’,
age = 20,
WHERE student_ID = 3333;

20
MySQL
Multiuser, multithreaded RDBMS server
Uses SQL to interact with and manipulate
data
Few important features
 Enable multiple tasks concurrently – requesting
process is more efficient
 Support various programming language
 Available for all common platforms
 Full support of functions and operators to
manipulate data
 Accessing tables from different database using a
single query
 Able to handle large database

TAB1033 - Internet Programming 23
Create Table fields

TAB1033 - Internet Programming 24
Table in MySQL

25
Introduction to Database Interface
Perl Database Interface (DBI)
 Enables user to access relational database from
Perl program.
 Database independent – allows migration among
DBMS
 Uses object-oriented interface – handles
PHP dbx module
 An XHTML-embedded scripting language
 Database interface that does not interact with
database directly
 It interacts with one of several database-specific
module

26
Introduction to DBI
Phyton DB-API
 Database Application Programming
Interface
 Consists of :
 Connection data object – access the database
 Cursor data object – manipulate and retrieve
data
 Portable across several databases

27
ADO.NET Object Model
Provides an API for accessing database
systems programmatically.
Was created for .NET framework
Was designed to interact with
Microsoft’s Component Object ModelTM
(COM) framework.
Further reading : Textbook, page 736

28
Summary
What is database?
The most popular database – relational
database
SQL for database queries
Database consists table(s)
Two Categories of SQL Statement.
1. Data manipulation
• SELECT, INSERT, DELETE,UPDATE
2. Data definition
DBI – Perl DBI, PHP dbx module, Python DB-
API
ADO.NET object Model

PHP - Getting good with MySQL part I

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