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

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    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

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    Web rch%tecture

    -$%ent

    )er*ent

    Ser+er

    Webront7en'(,ache"

    HTTP

    HTTP

    M%''$eware(PHP"

    acken'("

    API

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    MySQL APIs

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    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

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    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'%

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    MySQL PI

    PHP ha C '%

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    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;

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

    ,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;

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

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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

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

    0am,$e w%th aoc%at%+e 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_ASSOC))

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

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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 both numer%c an'aoc%at%+e:

    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_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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