Module 3

1. Review Basic SQL commands: Create Database, Create Table, Insert and Select 2. Connect an SQL Database to PHP 3. Execute SQL Commands in PHP

Standard Query Language

 SQL stands for Structured Query Language  SQL is a standard language for accessing databases.  MySQL, SQL Server, Access, Oracle, Sybase, DB2, and other database systems.  SQL lets you access and manipulate databases  SQL is an ANSI (American National Standards Institute) standard

 Although SQL is an ANSI (American National Standards Institute) standard, there are many different versions of the SQL language.  However, to be compliant with the ANSI standard, they all support at least the major commands (such as SELECT, UPDATE, DELETE, INSERT, WHERE) in a similar manner.  Note: Most of the SQL database programs also have their own proprietary extensions in addition to the SQL standard!

 To build a web site that shows some data from a database, you will need the following: An RDBMS database program (i.e. MS Access, SQL Server, MySQL) A server-side scripting language, like PHP or ASP SQL HTML / CSS

 CREATE DATABASE database_name Eg. Create database friends;

 A database most often contains one or more tables. Each table is identified by a name (e.g. "Customers" or "Orders"). Tables contain records (rows) with data.

 CREATE TABLE table_name ( column_name1 data_type, column_name2 data_type, column_name3 data_type,.... )

 CREATE TABLE Friends ( idnumber int, LastName varchar(255), FirstName varchar(255), Age varchar(255), Gender varchar(255) )

 Constraints are used to limit the type of data that can go into a table.  Constraints can be specified when a table is created (with the CREATE TABLE statement) or after the table is created (with the ALTER TABLE statement). NOT NULL UNIQUE PRIMARY KEY FOREIGN KEY CHECK DEFAULT

Id_numberLastnameFirstnameAgeGender 0001AgcopraJim21M 0002AgcopraJoseph26M 0003GalamitonPalquincy21M 0004BelonoCyril22F 0005GenerKathleen30F 0006De CastroRose Ann23F 0007CastilloJoan Rose28F 0008LlanderalJoan Rey29F 0009CarbonellAndrew27M 0010RoaBambi Rey28M 0011AgcopraJason28M

 The SELECT statement is used to select data from a database.  The result is stored in a result table, called the result-set.  SQL SELECT Syntax SELECT column_name(s) FROM table_name  and SELECT * FROM table_name

 and SELECT * FROM table_name WHERE [Conditions] Eg. Select * From ekek where lastname = ‘Gargar’;

 SELECT * FROM NAMES  SELECT Lastname,Firstname From Names  SELECT * FROM Names Where Lastname = ‘Agcopra’  SELECT * FROM Names Where Firstname like ‘A%’;  Select * From Names Where Age > 25 AND Gender = ‘M’

Standard Query Language

 Know your HTMLS  Know common PHP Commands and Structures  Master your SQL

1. Check if there is an PHP-SQL connection 2. Use a Database 3. Get a Table and Execute Queries 4. Extract Data from the Queries. 5. Close your Database after use.

<?php $connection = mysql_connect(‘localhost’,’root’,’password’) or die (‘Unable to Connect’); if($connection!=NULL) { echo "SQL is Connected to PHP"; }

mysql_select_db('friends') or die ('Unable to select a database!');

$query = 'Select * FROM names'; $result = mysql_query($query) or die (‘error in query’); ('Error in query: $query. '. msql_error());

 There are 3 different ways to extract data: Mysql_fetch_row() Mysql_fetch_assoc() Mysql_fetch_object()

1] echo " "; 2] 3] if(mysql_num_rows($result) > 0) 4] { 5]while($row = mysql_fetch_row($result)) 6]{ 7]echo " $row[1], $row[2] "; 8]} 9]} 10]echo " ";

1] echo " "; 2] 3] if(mysql_num_rows($result) > 0) 4] { 5]while($row = mysql_fetch_assoc($result)) 6]{ 7] echo " $row[‘lastname’], $row[‘firstname’] "; 8]} 9]} 10]echo " ";

1] echo " "; 2] 3] if(mysql_num_rows($result) > 0) 4] { 5]while($row = mysql_fetch_object($result)) 6]{ 7] echo " $row->lastname, $row->firstname "; 8]} 9]} 10]echo " ";

mysql_free_result($result); mysql_close($connection); ?>

<?php $connection = mysql_connect(‘localhost’,’root’,’password’); mysql_select_db('friends') ; $query = 'Select * FROM names'; $result = mysql_query($query); echo " "; if(mysql_num_rows($result) > 0) { while($row = mysql_fetch_row($result)) { echo " $row[1], $row[2] "; } echo " "; mysql_free_result($result); mysql_close($connection); ?>

PHP Commands mysql_connect(a,b,c ) a = dbserver b = user c = password mysql_select_db(a) a = database mysql_query(a) a = SQL command mysql_num_rows() Counts the number of rows $a=mysql_fetch_row(a)$a=mysql_fetch_assoc() $a=mysql_fetch_object()mysql_free_result(a)Mysql_close()

1 st Activity for the Semi-Finals

1.Make a Database named DB_31_[your block] 2.Make a Table named Employees Data Entity and Attributes: Idnum Lastname Firstname Department (Admin, Logistics, Sales, Accounting) Years Gender

1 st Page: The Site will Ask for the Lastname 1 st Page: The Site will Ask for the Lastname 2 nd Page: The Site will Show the Record 2 nd Page: The Site will Show the Record Does the record exist? Error Page: The Site give a feedback Error Page: The Site give a feedback False True

Show your work on next Tuesday.