PHP Chapter 10

7/23/2019 PHP Chapter 10

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mysqli MySqi "improved# API

$ery similar to mysql with some

improvements PD!

PHP Data !b%ects

All the three are e&tremely similar In this chapter we will use the mysqli

as our API or PHP


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'e will use the procedural version omysqli API

(here are ) basic steps or databaseinteraction in PHP*+ ,reate a database connection

-+ Perorm database query

.+ /se returned data0i any12+ 3elease the returned data

)+ ,lose the database connection

,onnectin to MySql withPHP


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Steps * and ) are used only once per PHPscripts

Steps - to 2 may be repeated many times

'e now ocus on steps * and ) 0openinthe connection and closin theconnection1

And the PHP unctions that we use to dothat which are part o the PHP API mysqliare the ollowin


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mysqli4connect01

mysqli4connect4errno01mysqli4connect4error01

mysqli4close01


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56php

77*+ ,reate a databse connection

8dbhost 9 :localhost:;

8dbuser 9 :root:;8dbpass 9 ::;

8dbname 9 :widet4crop:;

8connection 9 mysqli4connect08dbhost


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'e use the ollowin three mysqli API unctionsmysqli4query01mysqli4etch4row01mysqli4ree4result01

77-+ Perorm database query8query 9 :SL,( B C3!M sub%ects:;8result 9 mysqli4query08connection


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77.+ /se returned data 0i any1

while08row 9 mysqli4etch4row08result11=

77output data rom each row

var4dump08row1;echo :5hr@:;

?

772+ 3elease returned data

mysqli4ree4result08result1;


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'orEin with 3etrieved Data (he ollowin three ways can be used to retrieve data rom

query results*+ mysqli4etch4row01 > F it brins bacE a row o data and

assins it to a standard array+F the Eeys are inteers

-+ mysqli4etch4assoc01> F the result are returned in anassociative array

F the Eeys are column names

F it is slower.+ mysqli4etch4array01> F the results can be returned instandard array usin proper variable names maEe

the code more readable+ &> use8sub%ects instead o 8row


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,reatin 3ecords with PHPSuccess Failure

SL,( 3esource Calse

IS3( (rue Calse

/PDA( (rue Calse

DL( (rue Calse


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(o insert data into a database ocuson only steps *


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&ample

56php

77oten these are orm values in 84P!S(

8menu4name 9 "dit me#;

8position 9 2;

8visible 9 *;

77 -+ perorm database query8query 9 "IS3( I(! sub%ects 0menu4name 5input type9 :te&t: name9:position: siQe9 :.R:@5br@

nter visible> 5input type9 :te&t: name9 :visible:siQe9 :.R:@5br@

5input type9:submit: value9:Send:@

57orm@ 57body@ 57html@


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8menu4name 9 84P!S(Kmenu4name;

8position 9 84P!S(Kposition;

8visible 9 84P!S(Kvisible;

8query 9 :IS3( I(! sub%ects 0menu4name< position Similar to insertion ocus on *


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77,orrection

77-+ perorm database query

77oten these are orm values in 84P!S(

8id9*RR;8menu4name 9:Delete me:;

8query 9 :/PDA( sub%ects S(menu4name9=8menu4name? 'H3 id9=8id?:;

8result 9 mysqli4query08connection


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Deletin a record> Similar to updatin with a ew chanes

77-+ perorm database query 77oten these are orm values in 84P!S(

8id9;

8menu4name 9:Delete me:;

8query 9 "DL( C3!M sub%ects 'H3 id9=8id?:;

8result 9 mysqli4query08connection

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PHP Chapter 10