Web Units Lec 4 - PHP & MySQL v2(1)-2

7/23/2019 Web Units Lec 4 - PHP & MySQL v2(1)-2

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www.bournemouth.ac.uk

WP/WTI Lecture 4:PHP & MySQL (Part 1 o !"

Paul Albinson

[email protected]


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#ut$%ne

n %ntro'uct%on to MySQL

MySQL PI

)%n* our MySQL er+er #rac$e +. MySQL

PHP an' MySQL

#,erat%ona$ $o*%c -) o,erat%on

ata retr%e+a$

0rror han'$%n*


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An Introduction to MySQL


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MySQL

MySQL % the mot ,o,u$ar o,enource re$at%ona$ 'atabae

It ,r%mar%$y com,ete a*a%ntPot*reSQL %n the o,en ource MSmarket

#wne' an' ma%nta%ne' by #rac$e (but

t%$$ ree2" It % at3 re$%ab$e3 ca$ab$e3 an' eay to

ue.

It % +ery ,o,u$ar an' % ue' %n an'

Pronounced

My S Q L


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MySQL 0'%t%on

MySQL -ommun%ty 0'%t%on 8 9ree2 ece$$ent MS w%th a$$ the key

eature mot uer reu%re but %t ha nocutomer u,,ortThere % howe+er 'ocumentat%on an' a uer

orum

It % actua$$y better than the tan'ar'commerc%a$ +er%on

-ommerc%a$ +er%on 8 nnua$Subcr%,t%on Inc$u'e cutomer u ort


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-ommerc%a$ ;er%on

MySQL Stan'ar' 0'%t%on (=!3>>> ayear"

a%c 'atabae eature w%th cutomeru,,ort

The ree commun%ty e'%t%on % actua$$ybetter

MySQL 0nter,r%e 0'%t%on (=53>>> ayear" Im,ro+e' enter,r%e mana*ement

eature


7/51www.bournemouth.ac.uk

Web rch%tecture

-$%ent

)er*ent

Ser+er

Webront7en'(,ache"

HTTP

HTTP

M%''$eware(PHP"

acken'("

API



MySQL APIs



PHP atabae 0ten%on

atabae eten%on are PI ue'or acce%n* a 'atabae er+er %n

PHP The $%nk between the m%''$eware an'

the backen'

There are ! ty,e o 'atabaeeten%on: Abstraction layers

Vendor-specifc extensions



PI Ty,e

Abstraction layers: )n%y 'atabae %nteract%on o that co'e

ocue on 'atabae unct%on (uery3%nert3 'e$ete etc." rather than %n'%+%'ua$MS.

Th% make 'atabae co'e more @e%b$e3

Aut chan*e the conB*urat%on to ue a'%



MySQL PI

PHP ha C '%



My$% +. P#

Green = Advantae over other option


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My$% +. P#

%or no& &e'll start &it( ys!li our work o ar ha been ,roce'ura$ an' amy$%E ,roce'ura$ unct%onE are ea%er or

be*%nner than P# weE$$ ue them or now. P# w%$$be con%'ere' or WP net emeter.

More com,ar%on: htt,://,h,.net/manua$/en/my$%no.a,%.choo%n*.,h,

htt,://co'e.tut,$u.com/tutor%a$/,'o7+7my$%7wh%ch7hou$'7you7ue77net7!4>5F

More 'eta%$ on u%n* P#:

htt,://www.%te,o%nt.com/re7%ntro'uc%n*7,'o7the7r%*ht7way7to7acce7'atabae7%n7,h,
http://www.sitepoint.com/re-introducing-pdo-the-right-way-to-access-databases-in-php/http://php.net/manual/en/mysqlinfo.api.choosing.phphttp://code.tutsplus.com/tutorials/pdo-vs-mysqli-which-should-you-use--net-24059http://code.tutsplus.com/tutorials/pdo-vs-mysqli-which-should-you-use--net-24059http://code.tutsplus.com/tutorials/pdo-vs-mysqli-which-should-you-use--net-24059http://www.sitepoint.com/re-introducing-pdo-the-right-way-to-access-databases-in-php/http://www.sitepoint.com/re-introducing-pdo-the-right-way-to-access-databases-in-php/http://www.sitepoint.com/re-introducing-pdo-the-right-way-to-access-databases-in-php/http://www.sitepoint.com/re-introducing-pdo-the-right-way-to-access-databases-in-php/http://www.sitepoint.com/re-introducing-pdo-the-right-way-to-access-databases-in-php/http://code.tutsplus.com/tutorials/pdo-vs-mysqli-which-should-you-use--net-24059http://code.tutsplus.com/tutorials/pdo-vs-mysqli-which-should-you-use--net-24059http://code.tutsplus.com/tutorials/pdo-vs-mysqli-which-should-you-use--net-24059http://php.net/manual/en/mysqlinfo.api.choosing.phphttp://php.net/manual/en/mysqlinfo.api.choosing.phphttp://php.net/manual/en/mysqlinfo.api.choosing.php


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Usin) #ur MySQL Ser*er


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-onnect%on 'eta%$

To ue our MySQL er+er (a+a%$ab$eon ?au'a" you nee' the o$$ow%n*

'eta%$: Hot: 1!6.>.>.1

)ername: Gour re*u$ar uername e.*.%6654

Pawor': See your MGSQL70M0 B$e See the MGSQL70M0 B$e %n your home

'%rectory (/home/% 7 note % re,reentyour uername"


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Mo'%y%n* your 'atabae

Gou can mo'%y your 'atabae: ;%a co'e 8 Ty,%ca$$y SQL w%th%n a PHP

cr%,t ;%a the ,h,My'm%n 'atabae

mana*ement web a,,$%cat%on See htt,://

*au'a.bournemouth.ac.uk/*au'a'ba Dote th% current$y on$y work %n%'e )

;%a MySQL workbench (work anywhere"

?u%'e on u%n* ,h,My'm%n an'MySQL workbench are ,ro+%'e' on My)
https://gauda.bournemouth.ac.uk/gaudadbahttps://gauda.bournemouth.ac.uk/gaudadbahttps://gauda.bournemouth.ac.uk/gaudadbahttps://gauda.bournemouth.ac.uk/gaudadba


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#racle Vs$ MySQL


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#rac$e +. MySQL

The ,ur,oe % not abouthe$,%n* youchooe the r%*ht 'atabae to ue a the

two are bu%$t or '%


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ata uthent%cat%on

It % a ,roce ue' to +er%y the%'ent%ty o a 'atabae uer %n or'er to

,erm%t them to acce3 ,roce ora$ter 'ata.

MySQLE %m,$ementat%on: ?rant tab$e are ue' to kee, track o

uer an' the ,r%+%$e*e that they canha+e.

Locat%on can be checke' a$on* w%th the


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Schema

'atabae chema conta%n the 'eBn%t%on othe tab$e3 +%ew3 %n'ee3 uer3 contra%nt3tore' ,roce'ure3 tr%**er3 an' other

'atabae7,ec%Bc obAect. It can be con%'ere' a the hea'erJ B$e o a

'atabae wh%ch 'ecr%be %t tructure (b$ue,r%nt".

common un'ertan'%n* % that a databasein MySQL is a sc(ea in #racle. When u%n* a 'atabae3 you ue chema %n #rac$e

wh%$e you ue 'atabae %n MySQL.


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ata Ty,e

oth MySQL an' #rac$e u,,ort threema%n ty,e: numeric3 date and

time3 an' string.

The ma%n '%"3 9L#T(!4".


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ata Stora*e -once,t

In #rac$e3 tablespaces,ro+%'e $o*%ca$tora*e ,ace that $%nk a 'atabae to the,hy%ca$ 'ata B$e.

In MySQL3 a stora)e en)ine% ue' to 'ea$w%th 'ata tora*e an' retr%e+a$.

9or the 'eau$t tora*e en*%ne MyISM3 each'atabae % a '%rectory w%th%n the MySQL 'ata'%rectory where each tab$e o the 'atabae %tore' %n a e,arate et o B$e w%th%n the'%rectory.


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SQL Quer%e

oth #rac$e an' MySQL are MSwh%ch u,,ort SQL uer%e.

Howe+er3 they ha+e di+erent%m,$ementat%on o SQL ynta. -once,tua$$y3 they are the ame but

,ract%ca$$y they are '%


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SQL Synta 0am,$e

etr%e+e the Brt 5 row rom a'atabae tab$e

MySQLSELECT columnsFROM tableORDER BY keyASC LIMIT5;

#racleSELECT * FROM (SELECT columnsFROMtable ORDER BY keyASC) WHERE ROWNUM


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P,P and MySQL


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atabae #,erat%on Lo*%c

-onnect to

the er+er

Se$ect a

'atabae

Subm%t a

uery

etr%e+e'ata

%connectrom theer+er


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MySQL% Ma,,%n*

#,erat%onLo*%c

my$% 0ten%on

Ser+er connect%on mysqli_connect()

atabae e$ect%on mysqli_select_db()

Query ubm%%on mysqli_query()mysqli_multi_query()

ata retr%e+a$(etch row or row"

mysqli_fetch_assoc()

mysqli_fetch_array()

mysqli_fetch_all()

n' other mysqli_fetch_ +ar%at%on

Memory ree u, mysqli_free_result()

Ser+er '%connect%on mysqli_close()

0rror han'$%n* mysqli_error()


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Ser+er -onnect%on

Synta:

0u%+a$ent MySQL comman':

0am,$e:

9or our er+er the 'atabae name % the ame a theuername3 %n or'%nary c%rcumtance %t wou$' be'%


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atabae Se$ect%on

Synta:

0u%+a$ent SQL ynta: 0am,$e:

!"## = mysqli_!"##e!$(%&'&%+%i&',-5.%+

%/0ss1"r2%);

mysqli_sele!$_2(!"##+ %my2%);

mysqli_sele!$_2(connection+dbname);

6SE dbname;

)ote as you can speci*y the database +hen connectin to the

server usin mysqli_!"##e!$()the only time you +ouldneed to use this is to chane databases a*ter connectin.


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Ser+er %connect%on

Synta:

0u%+a$ent MySQL comman':

0am,$e:

!"## = mysqli_!"##e!$(%&'&%+%i&',-5.%+

%/0ss1"r2%+%i&',-5.%);

mysqli_!l"se(!"##);

mysqli_!l"se(dbconnection);

e7i$


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-) #,erat%on

-) tan' or reate3 .ead3 Updatean' Delete%n re$at%ona$ 'atabaea,,$%cat%on.

It reer to INS/.01./A0/3 S/L/03UPDA0/an' D/L/0/1D.#PSQL

tatement.

-) o,erat%on are %m,$emente' a SQL!ueries1coands.


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-) #,erat%on %n PHP

SQL uer%e are *enera$$y create' a strin)s%nPHP

They are eecute' on the MySQL er+er by u%n*mysqli_query()unct%on.

y 'eau$t3 uery reu$t are returne' a a result

set(mysqli_resul$obAect".

They can be then retr%e+e' by u%n* unct%on'eBne' %n mysqli_resul$c$a.


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-): -reate Tab$e

SQL ynta (ba%c":

0am,$e:

CREATE TABLE table (coltype);

query = 8CREATE TABLE 9F :OT E9STS/r"2u!$s (

/_i2 9:T :OT :6LL A6TO_9:CREME:T+

R9MARY EY (/_i2)+/_#0me >ARC?AR('55)+/_s$"[email protected] 9:T

)8;

resul$ = mysqli_query(!"##+ query);

,K%' ,Kname ,Ktock

IDT ;-H (!55" IDT


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-): Inert ata

SQL ynta (ba%c":

0am,$e:

9:SERT 9:TO table(col1,col2)>AL6ES (value1+ value2);

query = 89:SERT 9:TO /r"2u!$s (/_i2+/_#0me+ /_s$"[email protected]) >AL6ES (:6LL+ %%+

);8;resul$ = mysqli_query(!"##+query);,K%' ,Kname ,Ktock

> >


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-): Se$ect ata

SQL ynta (ba%c":

0am,$e:

SELECT * FROM table?ERE col=

%value

%;

query = 8SELECT * FROM /r"2u!$s?ERE /_s$"[email protected] = ;8;

resul$ = mysqli_query(!"##+query);

,K%' ,Kname ,Ktock

0 f 0


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-): ),'ate ata

SQL ynta (ba%c":

0am,$e:

6DATE tableSET col=%value%?ERE col= %value%;

query = 86DATE /r"2u!$s SET /_s$"[email protected] ='& ?ERE /_s$"[email protected] = ;8;


,K%' ,Kname ,Ktock

> 21


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-): e$ete ata

SQL ynta (ba%c":

0am,$e:

DELETE FROM table?ERE col=

%value%;

query = 8DELETE FROM /r"2u!$

?ERE /_s$"[email protected] = ;8;

resul$ = mysqli_query(!"##+query);


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-): ro,/e$ete a Tab$e

SQL ynta (ba%c":

0am,$e:

DRO TABLE 9F E9STS

table;

query = 8DRO TABLE 9F E9STS/r"2u!$s;8;



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ata etr%e+a$ Lo*%c %n PHP

Query reu$t are norma$$y ca$$e' data ro&s%n a 'atabae.

Thee 'ata row are returne' to PHP a aresult setwhere: 0ach 'ata row w%$$ be tore' %n an array.

The key o the array % the tab$e colunorco$umn index.

The +a$ue o the array % the data *aluecorre,on'%n* to the co$umn.

Loo,/%terat%on % ue' to *et a$$ 'ata row.


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ata etr%e+a$ %a*ram

,K%' ,Kname

,Ktock

> a 1>

1 b 11

! c 1!

C ' 1C

.esult set

, a -,

- b --

c -

/ d -/

, a -, Array-

0ey , -

1alue

- b -- Array1alue

c - Array/1alue

SELECT * FROM /r"2u!$s


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ata etr%e+a$ 0am,$e

?et a reu$t row a an enumerate' array:

0am,$e:

mysqli_e$!4_r"1();

query = 8SELECT * FROM /r"2u!$s?ERE /_s$"[email protected] ;8;

resul$ = mysqli_query(!"##+

query);14ile (r"1 =mysqli_e$!4_r"1(resul$))

e!4" r"1+ r"1&+ r"1';


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ata etr%e+a$ 0am,$e

9etch a reu$t row a an aoc%at%+e3 anumer%c array3 or both:

0am,$e w%th numer%c array:

mysqli_e$!4_0rr0y();

query = 8SELECT /_i2+ /_s$"[email protected] /r"2u!$s ?ERE /_s$"[email protected]

;8;

resul$ = mysqli_query(!"##+ query);14ile (r"1 =mysqli_e$!4_0rr0y(resul$+ MYSHL9_:6M))

e!4" r"1+ r"1&;


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ata etr%e+a$ 0am,$e


0am,$e w%th aoc%at%+e array:



;8;

resul$ = mysqli_query(!"##+ query);14ile (r"1 =mysqli_e$!4_0rr0y(resul$+MYSHL9_ASSOC))

e!4" r"18/_i28+ r"18/_s$"[email protected];


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ata etr%e+a$ 0am,$e


0am,$e w%th both numer%c an'aoc%at%+e:



;8;

resul$ = mysqli_query(!"##+ query);14ile (r"1 = mysqli_e$!4_0rr0y(resul$+

MYSHL9_BOT?))

e!4" r"18/_i28+ r"1&;

G


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ata etr%e+a$ 0am,$e

There are other way o etch%n*reu$t 8 See htt,://

,h,.net/manua$/en/c$a.my$%7reu$t.,h,
http://php.net/manual/en/class.mysqli-result.phphttp://php.net/manual/en/class.mysqli-result.phphttp://php.net/manual/en/class.mysqli-result.phphttp://php.net/manual/en/class.mysqli-result.phphttp://php.net/manual/en/class.mysqli-result.phphttp://php.net/manual/en/class.mysqli-result.php


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0rror Han'$%n*

-onnect%on error: mysqli_!"##e!$() It w%$$ return %ALS/% connect%n* a%$

The error can be ca,ture' u%n*mysqli_!"##e!$_err"r()

Query error: mysqli_query() It w%$$ return %ALS/% the uery a%$

The error can be ca,ture' w%th mysqli_err"r()

PHP unct%on 2ie()% norma$$y ue' when maAorerror are 'etecte' It w%$$ term%nate the current cr%,t an' e%t the ,ro*ram


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0rror Han'$%n* 0am,$e

Dorma$

Shorthan'

!"## =mysqli_!"##e!$(8&'&8+8user#0me8+

8/0ss1"r28+ 828);i (I!"##) 2ie(mysqli_!"##e!$_err"r());G

e!4" 8


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0rror Han'$%n* 0am,$e

eta%$e' connect%on error mea*e

!"## =mysqli_!"##e!$(8&'&8+8user#0me8+

8/0ss1"r28+ 828);

i (mysqli_!"##e!$_err"r()) e!4" 8F0ile2 $" !"##e!$ $" MySHLK

mysqli_!"##e!$_err"r();G

e!4" 8


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onclusion


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9urther rea'%n*

MySQL% %n PHP Manua$

MySQL 5. eerence Manua$

)$$man -ha,ter 4353 We$$%n* & Thomon -ha,ter

3F31>311


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Pre+%ew o the net $ecture

oo2ies

The conce,t o cook%e

-) #,erat%on o -ook%e )e or cook%e

Web Units Lec 4 - PHP & MySQL v2(1)-2

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