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PHP (and a little MySQL) for
the Default Library Techie
Lisa Bartle, Reference Librarian
Cal. State University, San Bernardino
[email protected]
909-537-7552
An Infopeople Workshop
PHP (and a Little MySQL) for the Default Library Techie Summer 2006 - This material has been created by Lisa Bartle for the Infopeople Project
[infopeople.org], supported by the U.S. Institute of Museum and Library Services under the provisions of the Library Services and Technology Act,
administered in California by the State Librarian. Any use of this material should credit the author and funding source.
Introductions
•Lab assistant
•Participants
–Name
–Position
–What you hope to do with PHP
PHP (and a Little MySQL) for the Default Library Techie
Assumptions for This Class
1. You know html code (e.g., tables, forms).
2. You understand the basics of databases (e.g., fields,
records, truncation).
3. A little programming experience in any language is
useful for this class but not essential (for example, you
know what a variable is).
PHP (and a Little MySQL) for the Default Library Techie
Goals for This Class
1. Not to teach everything about PHP, but provide
the basic knowledge for an online database.
2. Explain just the code, not setting up a server.
3. Provide a solid grounding so the books are not
as formidable.
PHP (and a Little MySQL) for the Default Library Techie
Diagram of Web Applications
Borrowed from MySQL/PHP Database Applications, 2nd ed. by Brad Bulger, Jay Greenspan, and
David Wall.
PHP (and a Little MySQL) for the Default Library Techie
What is PHP?
A scripting language most suitable for
online database management.
PHP (and a Little MySQL) for the Default Library Techie
PHP Benefits
• Open source, so it’s free
• Hosting is inexpensive
• PHP can be embedded in html files using .php
file extension
• Easy to learn
• Works powerfully and intimately with MySQL
and the web
PHP (and a Little MySQL) for the Default Library Techie
PHP More Benefits
•Works well with Apache – also open source
•Parse complex strings
•Communicate with many credit card processing systems
•Communicate with many protocols, including IMAP &
POP3 (email), NNTP (usenet), and DNS (hostnames &
addresses)
•Native database support for over 25 db products including
dBase, FilePro, FrontBase, IBM DB2, Hyperwave, mSQL,
MySQL, Sybase, Unix dbm, Access, and many others
oAccess may be more difficult to connect
PHP (and a Little MySQL) for the Default Library Techie
Who’s Using PHP?
Go to http://www.php.net/usage.php to
find current usage statistics.
http://www.abc-lit.com
PHP (and a Little MySQL) for the Default Library Techie
Recommendations
for Text Editors
• EditPlus2 from ES-Computing (free)
• NoteTab Light from Fookes Software (free)
• PHP Designer from MP Software (free)
• Crimson Editor from Ingyu Kang (free)
PHP (and a Little MySQL) for the Default Library Techie
It All Starts with the Database
The MySQL Connection
PHP (and a Little MySQL) for the Default Library Techie
What is MySQL?
• A database system often used for webaccessible databases
• A relational database management system
(RDMS), like Microsoft’s Access, using SQL
PHP (and a Little MySQL) for the Default Library Techie
MySQL Introduction
• Pronounced “My Ess Que Ell,” according to
the MySQL reference manual.
• Can handle small databases or very large ones
(ex. 50 million records, 60,000 tables and
about 5,000,000,000 rows; maximum table
size is 65536 terabytes, but operating systems
have limitations).
Look at the MySQL reference manual (downloads.mysql.com/docs/refman-5.0-en.pdf).
PHP (and a Little MySQL) for the Default Library Techie
MySQL Benefits
• Open source, so it’s free
• Designed to work intimately with PHP and the web
• Dependable code back to 1980s and fully backward
compatible
• Can operate with a variety of operating systems:
o
Unix; FreeBSD; Mac OS X; Solaris; Windows 9x,
Me, NT, 2000, XP, and Server 2003
(Microsoft products are not the best with MySQL)
PHP (and a Little MySQL) for the Default Library Techie
How Is Your Data Stored?
• Access
• Excel
• Something else
PHP (and a Little MySQL) for the Default Library Techie
If You Have Data …
• Using Access or Excel you may want to
convert to MySQL using an online converter
• Intelligent Converters has several for-fee
programs at http://www.convert-in.com
PHP (and a Little MySQL) for the Default Library Techie
If You Don’t Have Data …
• Create a database using MySQL client
PHP (and a Little MySQL) for the Default Library Techie
More If You Don’t
Have Data …
• Create a database using Access or Excel
• Create a database using phpMyAdmin
o
a tool written in PHP for the administration of a
o
MySQL server over the Web
often included with the operating system
PHP (and a Little MySQL) for the Default Library Techie
phpMyAdmin Table Creation
PHP (and a Little MySQL) for the Default Library Techie
To Maintain Your Data
• Use Access or Excel to update, then convert
to MySQL using a converter
PHP (and a Little MySQL) for the Default Library Techie
MySQL data
INSERT INTO 'people' VALUES('Joann', 'M',
'Aardappel', "", 'Pine Bluff', 'AR', 'Fontana',
'CA', 'San Bernardino County Sun', '2000-10-09');
INSERT INTO 'people' VALUES('Louie', 'R',
'Aboytes', "", 'Mesa', 'AZ', 'Loma Linda', 'CA',
'San Bernardino County Sun', '2001-01-05');
INSERT INTO 'people' VALUES('Edith', "",
'Abramson', 'Gimble', 'St. Paul', 'MN', 'Redlands',
'CA', 'San Bernardino County Sun', '2000-11-18');
INSERT INTO 'people' VALUES('Antonia', "",
'Acevedo', 'Bermudez', "", 'Mexico', 'Fontana',
'CA', 'San Bernardino County Sun', '2000-11-14');
PHP (and a Little MySQL) for the Default Library Techie
To Maintain Your Data
• Use Access or Excel to update, then convert
to MySQL using a converter
• Use phpMyAdmin to update
PHP (and a Little MySQL) for the Default Library Techie
phpMyAdmin Data Input
PHP (and a Little MySQL) for the Default Library Techie
Housekeeping
1. Open Internet Explorer
2. Go to Tools > Internet Options > Advanced
3. Put an X next to: Enable folder view for FTP
sites
PHP (and a Little MySQL) for the Default Library Techie
Our Project
Go to http://phpclass.infopeople.org/search.html
PHP (and a Little MySQL) for the Default Library Techie
The PHP Connection
PHP (and a Little MySQL) for the Default Library Techie
PHP Start and Stop
example1.php
•PHP code starts
<?php
•PPH code ends
?>
PHP (and a Little MySQL) for the Default Library Techie
Comments
• Explain the purpose of the coding
• Help you and others read the code
• Help you when you’ve forgotten what it
all means
PHP (and a Little MySQL) for the Default Library Techie
Comment Structure
// begin each line inside the PHP code
# begin each line inside the PHP code
/* begin and */ end several lines inside
the PHP code
PHP (and a Little MySQL) for the Default Library Techie
Comment Examples
<?php
//Purpose: to create a form for patrons’ questions
?>
---------------------------<?php
###### Show Results to User ######
?>
---------------------------<?php
/*
Purpose: to create a form for patrons’ questions
Author: Lisa Bartle
Date: Nov. 6, 2006
*/
?>
PHP (and a Little MySQL) for the Default Library Techie
Exercise 1
Open up Notepad and get to coding!
PHP (and a Little MySQL) for the Default Library Techie
“Hello_Librarians”:
First PHP Example
Code
User Sees
example1.php
<h2>Infopeople PHP class</h2>
<?php
print "<p>Hello librarians!";
?>
PHP (and a Little MySQL) for the Default Library Techie
PHP and HTML
•HTML can be outside of PHP coding
•HTML can be inside of the code, but must
be inside quotation marks with a print
statement
•PHP statements end in a semi-colon
example1.php
PHP (and a Little MySQL) for the Default Library Techie
Outputting Data
•Echo -- a language construct or structure for a
single argument.
•Print -- a language construct, which can have
multiple arguments and more complex
expressions.
We will use PRINT in this class.
PHP (and a Little MySQL) for the Default Library Techie
Echo & Print Example
Code
User Sees
example2.php
<?php
Echo "Infopeople PHP Presentation";
Print "<P>Hello librarians.";
?>
PHP (and a Little MySQL) for the Default Library Techie
What is a Variable?
• A variable is a place to store information.
• Information stored in a variable can be defined
by the programmer.
• Information stored in a
variable can come from a
user using a form.
PHP (and a Little MySQL) for the Default Library Techie
Variables
• A variable always begins with a $ then the
variable name.
• Variables are case sensitive and alpha-numeric.
• Do not start a variable with a number.
• All the variables below are different.
$book
$amount
$Amount
$AmoUnT
$AMOUNT
PHP (and a Little MySQL) for the Default Library Techie
Variable Example
<?php
Print "<h2>Infopeople PHP Presentation
</h2><br>";
print "<p>Hello librarians! <br>";
$date="Nov. 6, 2006";
print "Today’s date is $date";
?>
example3.php
PHP (and a Little MySQL) for the Default Library Techie
Printing Variables
<?php
$date="Nov. 6, 2006";
print "Today’s date is $date";
Print "Today’s date is "; print $date;
?>
example3.php
PHP (and a Little MySQL) for the Default Library Techie
Date Function
• Use date() to display the date and time
• Can display in multiple ways
Jul. 12, 2006
July 12, 2006
7/12/2006
2006/07/12
example7.php
PHP (and a Little MySQL) for the Default Library Techie
Date Display
$datedisplay=date("Y/m/d");
print $datedisplay;
# If the date is November 6, 2005
# It would display as 2005/11/06
$showdate=date("l, F j, Y");
print $showdate;
# If the date is November 6, 2005
# It would display as
# Sunday, November 6, 2005
See handout “Displaying the Date Using Date()”
example7.php
PHP (and a Little MySQL) for the Default Library Techie
Exercise 2
Open up Notepad and get to coding!
PHP (and a Little MySQL) for the Default Library Techie
Profession Example
profession.php
PHP (and a Little MySQL) for the Default Library Techie
The HTML Connection
PHP (and a Little MySQL) for the Default Library Techie
Forms
Forms provide an interface for users to
query your database.
PHP (and a Little MySQL) for the Default Library Techie
Forms HTML
<-- form tag goes before the form objects -->
<form>
[form objects go here]
[radio buttons, pull-down menus, text boxes]
[submit button, cancel button]
</form>
PHP (and a Little MySQL) for the Default Library Techie
Radio Buttons
<INPUT type="radio" name="sex" value="M"> Male<BR>
<INPUT type="radio" name="sex" value="F">
Female<BR>
Name becomes the variable name.
Value is what the variable is holding.
example9.html
PHP (and a Little MySQL) for the Default Library Techie
Pull-Down Menus
<p>City of death: <select name="deathcity"
size="1">
<option selected value="">Search all cities in
database</option>
<option value="Fontana">Fontana</option>
<option value="Loma Linda">Loma Linda</option>
<option value="Redlands">Redlands</option>
<option value="San Bernardino">San
Bernardino</option>
<option value="Victorville">Victorville</option>
</select>
Name =variable name.
Value =what variable is holding.
example10.html
PHP (and a Little MySQL) for the Default Library Techie
Text Boxes
<input TYPE= "text" NAME="anyname" SIZE="20"
MAXLENGTH="40">
Name =variable name.
example11.html
PHP (and a Little MySQL) for the Default Library Techie
Check Boxes
Libraries should get more<p>
<input TYPE="checkbox" NAME="money"
VALUE="Yes" checked> Money <br>
<input TYPE="checkbox" NAME="respect"
VALUE="Yes"> Respect
Name=variable name
Value=what variable is holding.
example13.html
PHP (and a Little MySQL) for the Default Library Techie
Submit/Reset Buttons
<input TYPE="submit" NAME="Search"
VALUE="Search it!">
<input TYPE="reset" NAME="Cancel"
VALUE="Clear Form">
example14.html
PHP (and a Little MySQL) for the Default Library Techie
Form Action
<-- not just form tag, but form action -->
<form action="file,URL,or path" method="post">
[form objects here]
</form>
PHP (and a Little MySQL) for the Default Library Techie
The PHP Connection
PHP (and a Little MySQL) for the Default Library Techie
Operators
• Arithmetic operators
• Assignment operators
• Comparison operators
See handout “Operators.”
PHP (and a Little MySQL) for the Default Library Techie
Arithmetic Operators
$a + $b
$a - $b
$a * $b
$a / $b
example6.php
//addition
//subtraction
//multiplication
//division
PHP (and a Little MySQL) for the Default Library Techie
Assignment & Arithmetic
Operators
<?php
$a=15;
$b=30;
$total=$a+$b;
Print $total;
Print "<p><h1> $total </h1>";
//total is 45
?>
example6.php
PHP (and a Little MySQL) for the Default Library Techie
Comparison Operators
Equal
$a == $b
Not Equal
$a != $b
$a <> $b
Less Than
$a < $b
Less Than or Equal to
$a <= $b
Greater Than
$a > $b
Greater Than or Equal to
$a >= $b
See handout “Operators”
PHP (and a Little MySQL) for the Default Library Techie
Difference Between = and ==
= Assigns a value to a variable
== Checks the value of a variable
See handout “Operators.”
PHP (and a Little MySQL) for the Default Library Techie
If … Else
If (condition)
{
Statement;
}
Else
{
Statement;
}
If ($user=="Lisa")
{
Print "Hello Lisa.";
}
Else {
Print "You aren't Lisa.";
}
No THEN in PHP
PHP (and a Little MySQL) for the Default Library Techie
If (condition)
{
Statement;
}
Elseif (condition)
{
Statement;
}
Else
{
Statement;
}
ElseIf
If ($user=="Lisa")
{
Print "Hello Lisa.";
}
Elseif ($user=="Mo")
{
Print "Hello Mo.";
}
Else
{
Print "Who are you?";
}
PHP (and a Little MySQL) for the Default Library Techie
While Loops
While (condition)
{
Statement;
}
example8.php
<?php
$count=0;
While ($count<5)
{
Print "Hello Lisa.";
$count=$count + 1;
}
#Another way to say
#to say that is
#$count++;
?>
PHP (and a Little MySQL) for the Default Library Techie
Profession Example
1. Go to
profession.php
http://phpclass.infopeople.org/lisa/profession.php
PHP (and a Little MySQL) for the Default Library Techie
Questions to Think About
1. What is the first step for this code?
2. What kind of php structures will be necessary?
example15.php
PHP (and a Little MySQL) for the Default Library Techie
Exercise 3
PHP (and a Little MySQL) for the Default Library Techie
Top Errors & Messages
1. Missing semi-colon.
2. Misspelled variables and missing $.
3. Incomplete pairs for quotation marks, parentheses, curly
brackets, etc.
See handout
“Common PHP Mistakes and Error Messages”
PHP (and a Little MySQL) for the Default Library Techie
Our Sample Database
• This class’s prepared database is called obituaries.
• The file is obituaries.sql.
• It is an index of people’s names who have had
obits listed in the newspaper. It is for patron’s
genealogical research.
• The table called people has our data.
Records: 100
Fields:
11
See handout “Organize Your Database
and Server Information”
PHP (and a Little MySQL) for the Default Library Techie
Download Search.html to
Your Directory
Go to http://phpclass.infopeople.org/search.html
1. Click View > Source
2. Save the file as search.html
to your desktop.
3. Copy the file from your
desktop into your directory.
You will not need to create the search form from scratch.
PHP (and a Little MySQL) for the Default Library Techie
search.php
>>Creates connection to server & database
•Alters input for safety
•Creates SQL query
•Displays the results
>>Close the connection to database
PHP (and a Little MySQL) for the Default Library Techie
Connect to the Server
Mysql_connect() is the function used to
connect to the server.
mysql_connect("hostaddress", "myusername",
"mypassword") or die ("message");
Die() is a function for an output message and to terminate the
current script.
PHP (and a Little MySQL) for the Default Library Techie
Mysql_connect() Structure
$connection=mysql_connect("hostaddress",
"myusername", "mypassword") or die
("message");
PHP (and a Little MySQL) for the Default Library Techie
Mysql_connect() Example
# Create connection to database
# Define variables
$hostaddress="phpclass.phpclass.
infopeople.org";
$myusername="phpclass";
$mypassword="infopeople";
$connection=mysql_connect($hostaddress
, $myusername, $mypassword) or die
("Can’t connect to server.");
PHP (and a Little MySQL) for the Default Library Techie
Close Connection
Mysql_close() is the function to close the
connection to the server.
mysql_close($connection);
PHP (and a Little MySQL) for the Default Library Techie
Connect to the Database
Mysql_select_db() is the function to select your
MySQL database.
mysql_select_db("database") or die ("Message");
PHP (and a Little MySQL) for the Default Library Techie
Mysql_select_db()
#$database="obituaries";
#$tablename="people";
$result=mysql_select_db($database)
or die("Database could not be
selected");
PHP (and a Little MySQL) for the Default Library Techie
Alter Input for Safety
• Creates connection to database
>>Alters input for safety
• Creates SQL query
• Displays the results
• Close the connection to database
PHP (and a Little MySQL) for the Default Library Techie
Trim(), Strip_tags(),
Strtolower()
• Trim removes whitespace at the beginning and end of a string.
• Strip_tags tries to remove PHP & HTML tags from a string.
• Strtolower converts alpha characters to lowercase.
$anyname=trim($anyname);
$anyname=strip_tags($anyname);
$anyname=strtolower($anyname);
search.php
PHP (and a Little MySQL) for the Default Library Techie
Exercise 4
Open up Notepad and get to coding!
PHP (and a Little MySQL) for the Default Library Techie
Create SQL Query
• Creates connection to database
• Alters input for safety
>>Creates SQL query
• Displays the results
• Close the connection to database
PHP (and a Little MySQL) for the Default Library Techie
Concatenation
“A union by chaining or linking together.” Use a
period to link together strings.
<?php
$string1="Hello";
$string2="Librarians";
$string3=$string1." ".$string2;
Print $string3;
print "<p>";
Print $string1." ".$string2;
?>
example5.php
PHP (and a Little MySQL) for the Default Library Techie
Escaping the Character
If the string has a set
of double quotation
marks that must
remain visible, use
the \ [backslash]
before the quotation
marks so PHP does
not act on them and
only displays them.
example16.php
<?php
$heading="\"Lisa's
Books\"";
Print $heading;
?>
PHP (and a Little MySQL) for the Default Library Techie
The SQL Connection
PHP (and a Little MySQL) for the Default Library Techie
Diagram of Web Applications
Borrowed from MySQL/PHP Database Applications, 2nd ed. by Brad Bulger, Jay Greenspan, and
David Wall.
PHP (and a Little MySQL) for the Default Library Techie
What is SQL?
• Structured Query Language
• A database access language standard
• All SQL-capable databases support a
common subset of SQL
o
Access, MySQL, some Oracle databases, etc.
PHP (and a Little MySQL) for the Default Library Techie
SQL Select Query Template
SELECT [field],[field] from [table] WHERE
[field] [operator] [parameter or input]
ORDER BY [field] [ASC or DESC];
PHP (and a Little MySQL) for the Default Library Techie
SQL Query Examples
Database: obituaries
Table: people
Fields: lastname, firstname, middlename,
maidenname, newsdate, newsyear
•SELECT lastname, firstname from people where newsyear
> 2000;
•SELECT lastname, firstname from people where newsyear
> 2000 and newsyear < 2003;
•SELECT lastname, firstname from people where newsyear
BETWEEN 2000 and 2003;
Numbers do not need quotation marks in SQL.
PHP (and a Little MySQL) for the Default Library Techie
SQL Query Examples
Database: obituaries
Table: people
Fields: lastname, firstname, middlename,
maidenname, newsdate, newsyear
•SELECT * from people where lastname = "Jones";
•SELECT * from people where lastname LIKE "Jones%";
•SELECT * from people where lastname LIKE "%Jones";
•SELECT * from people where lastname LIKE "%Jones%"
ORDER BY lastname ASC, firstname ASC;
Text needs quotation marks in SQL.
PHP (and a Little MySQL) for the Default Library Techie
PHP & SQL in the Query
SELECT * from people where
lastname LIKE "%Jones%" ORDER BY
lastname ASC;
$query="SELECT * from people
where lastname LIKE \"%Jones%\"
ORDER BY lastname ASC";
PHP (and a Little MySQL) for the Default Library Techie
Variables in the PHP/SQL
Query
$query="SELECT * from people
where lastname LIKE \"%Jones%\"
ORDER BY lastname ASC";
$query="SELECT * from "
.$tablename. " where lastname
LIKE \"%" .$anyname. "%\" ORDER
BY lastname ASC";
PHP (and a Little MySQL) for the Default Library Techie
Match Against In Boolean Mode
$query="SELECT * from " .$tablename. "
WHERE MATCH(firstname, middlename,
lastname, maidenname) AGAINST
('$anyname' IN BOOLEAN MODE) AND
newsyear>= " .$newsyear1. " AND
newsyear<=" .$newsyear2. " ORDER BY
lastname ASC";
Red=PHP
Purple=SQL
PHP (and a Little MySQL) for the Default Library Techie
SQL Troubleshooting Tips
Build the SQL statement slowly, piece by piece.
# Keep what is working and comment it out so
# that you can start from success when you
# need to start over.
# $query="SELECT * from ".$tablename;
# This works
$query="SELECT * from ".$tablename;
Print the query so you can tell where it is breaking down.
Print $query;
PHP (and a Little MySQL) for the Default Library Techie
SQL Query
If ($deathcity=="") {$deathcityquery=" ";}
else {$deathcityquery=" and
deathcity=\"".$deathcity."\"";}
PHP (and a Little MySQL) for the Default Library Techie
More SQL Query
If ($anyname=="")
{
$query="SELECT * from " . $tablename. " WHERE
newsyear >=".$newsyear1." AND
newsyear<=".$newsyear2.$deathcityquery."
ORDER BY lastname ASC";
}
else
{
$query="SELECT * from " . $tablename. " WHERE
match(firstname, middlename, lastname,
maidenname) against ('$anyname' in boolean
mode) and newsyear >=".$newsyear1." AND
newsyear<=".$newsyear2.$deathcityquery."
ORDER BY lastname ASC";
• }
PHP (and a Little MySQL) for the Default Library Techie
Download sql_query.php
Sql_query.php is available in the main directory
of the ftp server.
• Copy the file to your desktop.
• Open it.
• Copy the query and place it under the header
Create SQL Query.
PHP (and a Little MySQL) for the Default Library Techie
True Boolean Queries
We have a textbox, $anyname, in our obituary
search form. We want it to be Boolean searchable.
Such as:
(peek or byrd) and (mary or ellen)
How do we do it?
PHP (and a Little MySQL) for the Default Library Techie
Alter the Input for SQL
Think of our old AltaVista searches:
+alice –wonderland +columbia
We need to use PHP to substitute the AND, OR,
NOT that the users input so that SQL can
understand it.
PHP (and a Little MySQL) for the Default Library Techie
Create Boolean String
# Insert an initial plus-sign so
# the first term or phrase is
# included as a mandatory.
$addplus="+";
$anyname=$addplus.$anyname;
PHP (and a Little MySQL) for the Default Library Techie
Replacing Strings
Use str_replace() to replace one string with
another.
$string= str_replace("find this", "replace with
this", $in_ this_string);
PHP (and a Little MySQL) for the Default Library Techie
Create Boolean String
str_replace() AND
# Replace all the AND's with +'s,
# so that SQL’s fulltext indexing
# can understand it.
# The spacing is important here.
$anyname=str_replace(" and ", " +",
$anyname);
PHP (and a Little MySQL) for the Default Library Techie
Create Boolean String
str_replace() OR
# OR is assumed, so just pull
# those out.
$anyname =str_replace(" or ", " ",
$anyname);
PHP (and a Little MySQL) for the Default Library Techie
Create Boolean String
str_replace() NOT
# look for NOTs
$anyname=str_replace(" not ", " -",
$anyname);
# Some people may put AND NOT. Since
# we already replaced the ANDs and
# ORs, this may look strange.
$anyname=str_replace(" +not ", " -",
$anyname);
PHP (and a Little MySQL) for the Default Library Techie
Mysql_query()
Where $query is the constructed SQL query:
mysql_query($query) or die(“Message.");
$result=mysql_query($query) or
die("Couldn’t execute query.");
PHP (and a Little MySQL) for the Default Library Techie
Exercise 5
Open up Notepad and get to coding!
PHP (and a Little MySQL) for the Default Library Techie
search.php
• Creates connection to database
• Alters input for safety
• Creates SQL query
>>Displays the results
• Close the connection to database
PHP (and a Little MySQL) for the Default Library Techie
What is an Array?
An array is a variable
that holds many
different variables in
it.
“An array of books.”
PHP (and a Little MySQL) for the Default Library Techie
$result is an Array
where the results are stored.
$result=mysql_query($query) or
die("Couldn’t execute query.");
PHP (and a Little MySQL) for the Default Library Techie
Mysql_fetch_array()
Use mysql_fetch_array() to gather the
waiting query results row by row, then
display them.
$counter=0;
while
($rows=mysql_fetch_array($result))
# displaying data from results
{
Display row after row here with html.
}
PHP (and a Little MySQL) for the Default Library Techie
Mysql_num_rows()
Use mysql_num_rows to get the number of matching
results. $Numrows is the number of rows, or records,
in the result of the query.
$numrows=mysql_num_rows($result);
PHP (and a Little MySQL) for the Default Library Techie
Plan the Display
Write out how you want it to look!
There are X result(s) in your search.
1. lastname (maidenname), firstname middlename
Born: birthcity, birthstate
Died: deathcity, deathstate
Obituary: <i>newspaper</i> newsdate, newsyear
PHP (and a Little MySQL) for the Default Library Techie
Display Results to User
$counter=0;
$numrows=mysql_num_rows($result);
Print "There are $numrows result(s) in
your search.<p>"
PHP (and a Little MySQL) for the Default Library Techie
Display Results to User
while ($rows=mysql_fetch_array($result))
# filling-in data from results
{
$counter=$counter+1;
Print $counter.". ".$rows["lastname"]. " (" . $rows["maidenname"]
."), " . $rows["firstname"] ." " . $rows["middlename"]."<br>";
}
Red is HTML and the quotation marks surrounding it.
PHP (and a Little MySQL) for the Default Library Techie
Review of PHP
PHP (and a Little MySQL) for the Default Library Techie
search.php
• Creates connection to database
• Alters input for safety
• Creates SQL query
• Displays the results
>>Close the connection to database
PHP (and a Little MySQL) for the Default Library Techie
Close Connection
Mysql_close is the function to close the
connection to the server.
mysql_close($connection);
PHP (and a Little MySQL) for the Default Library Techie
Exercise 6
Open up Notepad and get to coding!
PHP (and a Little MySQL) for the Default Library Techie
Include Files & Require Files
Include and require insert files (sensitive or oft-repeated code
stored in files) into the current code. This will prove useful and
protective once you connect to a database, as well as for other
repeated functions.
Include "/path/to/filename.html";
include ("footer.txt");
require ("start.inc");
example17.inc
PHP (and a Little MySQL) for the Default Library Techie
Include Files & Require Files
The file start.inc might look like:
<?php
$hostaddress="phpclass.phpclass.infopeople.org";
$username="phpclass";
$password="infopeople";
$database="obituaries";
$tablename="people";
?>
example17.inc
PHP (and a Little MySQL) for the Default Library Techie
Include File Placement
### Define Connection Variables ###
Require ("start.inc");
### Connect to Serve & Database ###
$connection=mysql_connect($hostaddre
ss, $myusername, $mypassword) or die
("Can’t connect to server.");
PHP (and a Little MySQL) for the Default Library Techie
PHP Covered
date()
die()
echo
elseif
if … else
include()
mysql_close()
mysql_connect()
mysql_fetch_array()
mysql_num_rows()
mysql_query()
mysql_select_db()
print
require()
str_replace()
strip_tags
strtolower()
trim()
while
#
//
/* & */
.
19 down,
\
4592 to go!
PHP (and a Little MySQL) for the Default Library Techie
Evaluation Time
Please go to
infopeople.org/wseval.html
and complete the evaluation.
Thank you!