Working with Database.ppt

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Working with Databasesand MySQL



Introduction to Databases

• A database is an ordered collection ofinformation from which a computer programcan quickly access information

• ach row in a database table is called a record

• A record in a database is a single completeset of related information

• ach column in a database table is called a!eld

• Fields are the indi"idual categories ofinformation stored in a record

Name of Book 2





Introduction to Databases#continued$

• A fat-le database storesinformation in a single table

•

A relational database stores information across multiple relatedtables

4



%nderstanding &elationalDatabases

• &elational databases consist of one or morerelated tables

• A primary table is the main table in a

relationship that is referenced by anothertable

• A related table #or 'child table($references a primary table in a relational

database• A primary key is a !eld that contains a

unique identi!er for each record in aprimary table

5



%nderstanding &elational Databases#continued$

• A primary key is a type of inde)*which identi!es records in a databaseto make retrie"als and sorting faster

• A oreign key is a !eld in a relatedtable that refers to the primary key in aprimary table

• +rimary and foreign keys link recordsacross multiple tables in a relationaldatabase

6



,ne-to-,ne &elationships

• A one-to-one relationship e)ists betweentwo tables when a related table containse)actly one record for each record in theprimary table

• .reate one-to-one relationships to breakinformation into multiple* logical sets

• Information in the tables in a one-to-onerelationship can be placed within a single

table• Make the information in one of the tables

con!dential and accessible only by certainindi"iduals

7



,ne-to-,ne &elationships#continued$

8

Figure 8-2 One-to-one relationship



,ne-to-,ne &elationships#continued$

9

Figure 8-2 One-to-one relationship (continued)



,ne-to-Many &elationship

• A one-to-many relationship e)ists in arelational database when one record in aprimary table has many related records in

a related table• /reaking tables into multiple related tables

to reduce redundant and duplicateinformation is called normalization

• +ro"ides a more e0cient and lessredundant method of storing thisinformation in a database

10



,ne-to-Many &elationship#continued$

11

Figure 8-3 Table with redundant inormation




12

Figure 8-! One-to-many relationship




13

Figure 8-! One-to-many relationship (continued)



Many-to-Many &elationship

• A many-to-many relationship e)istsin a relational database when manyrecords in one table are related to

many records in another table• A junction table creates a one-to-

many relationship for each of the twotables in a

many-to-many relationship• A 1unction table contains foreign keys

from the two tables

14



Working with Database ManagementSystems

• A database management system #or D/MS$is an application or collection of applicationsused to access and manage a database

• A schema is the structure of a databaseincluding its tables* !elds* and relationships

• A fat-le database management systemis a system that stores data in a 2at-!le format

• A relational database management

system #or &D/MS$ is a system that storesdata in a relational format

15



Working with Database ManagementSystems #continued$

16

Figure 8-" #any-to-many relationship




17

Figure 8-" #any-to-many relationship (continued)




• Important aspects of databasemanagement systems3

– 4he structuring and preser"ation of thedatabase !le

– nsuring that data is stored correctly ina database5s tables* regardless of the

database format – Querying capability

18




• A query is a structured set of instructionsand criteria for retrie"ing* adding* modifying*and deleting database information

• Structured query language #or SQL$ is astandard data manipulation language used

among many database managementsystems

• Open database connectivity #or ,D/.$allows ,D/.-compliant applications toaccess any data source for which there is an,D/. dri"er

19



Querying Databases with StructuredQuery Language

20

Table 8-1 $ommon %&' eywords



!S"#

Name of Book 21



$hat is yS"#%

• MySQL is a database engine that usesthe standard SQL interface6 MySQL is"ery popular as a back end for web

applications6• 4he MySQL engine can be accessed

from most ma1or

programming7scripting languagessuch as perl* php* and ruby making iteasy to de"elop applications6

Name of Book 22



$hat is yS"# good or%

• $eb &pplications3 /ecause MySQL canbe easily integrated into scriptinglanguages such as perl and php it is "ery

popular for web applications6• '() &pplications3 4he same scripting

language integration that makes MySQLwork well with web applications also

makes it work well with local 8%I and e"encommand line applications or anythingelse that stores structured data6

Name of Book 23



yS"# *ommands

• +o list , vie , see all the database justtype. show databases;

• +o use the database just type. use <database_name>;

)3 use `sample1`;

24



yS"# *ommands

• +o list , vie , see all the tables in thedatabase just type. show tables; (show the tables inside

the current database) or show tables from <database_name>; (to

see tables from different database(s));

)3 show tables from `sample1`;

25





yS"# *ommands

• /dit , 0ename a database.

MySql remo"e the rename feature so you

need to drop and create a new databaseinstead of 1ust renaming it666

27



yS"# *ommands

• 1elete a database.

Synta)3

!R$% !AA"A#E <database_name>;

)3 !R$% !AA"A#E `sample1` ;

28



yS"# *ommands

• *reate a table. 2ote. when creating a table* !rst you

need to be sure that you are using thecorrect database in which you want tocreate your new table and also create atleast : !eld for the table otherwise* an

error will occur666

29



yS"# *ommands

• *reate a table.Synta)3CREAE A"&E <table_name> (<field_name>

<t'pe>(sie_of_the_field) *&& + $ *&&) -; if you want the !eld to accept <ull"alues or not

)3CREAE A"&E `sample1` (`student_name`

,ARC-AR( 1.. ) *&&);

30



yS"# *ommands

• /dit , 0ename a table.

Synta)3

A&ER A"&E <old_table_name>REA/E <new_table_name>;

)3

A&ER A"&E `sample1` REA/E`sample0` ;

31



yS"# *ommands

• 1elete a table.

Synta)3

!R$% A"&E <table_name>;

)3 !R$% A"&E `sample0`;

32



yS"# *ommands

• +o sho all columns , elds rom atable just type.

Synta)3 #how columns from <table_name>;

)3

#how columns from `sample1`;

33



yS"# *ommands

• )nsert a eld , column to a table.

Synta)3

A&ER A"&E <table_name> A!!<field_name> <t'pe>( <sie> ) *&& + $

*&& ;

)3 A&ER A"&E `sample1` A!! àddress`

,ARC-AR( 1.. ) *&& ;

34



yS"# *ommands

• /dit , 0ename a eld , column o atable4

Synta)3 A&ER A"&E <table_name> C-AE

<old_field_name> <new_field_name>

<t'pe>(<sie>) *&& + $ *&&;

)3 A&ER A"&E `sample1` C-AE `name1`

`name` 2archar(1..) *&&;

35



yS"# *ommands

• 1elete a eld , column o a table4

Synta)3

A&ER A"&E <table_name> !R$%<field_name>;

)3

A&ER A"&E `sample1` !R$%àddress`;

36



yS"# *ommands

• )nserting ne record. Synta)3 3#ER 3$ <table_name>

(<field1>4<field0>555) ,A&*E#(<2alue1>4<2alue0>555);

)3

3#ER 3$ `sample1` ( ` name` 4àddress` ) ,A&*E# (6marco elias palic

2alencia64 6porac4 pampan7a6);

37



yS"# *ommands

• /dit a record. A: Without a condition: Synta)3

*%!AE <table_name> set <field_name1>8 <new_2alue1>4 <field_name0>

8<new_2alue0>555 ;

)3 *%!AE `sample1` #E ` name` 8 6marco

elias palic 2alencia164àddress` 8

6porac4 pampan7a16;

38



yS"# *ommands

• /dit a record. B: With a condition: Synta)3 *%!AE <table_name> set <field_name1> 8

<new_2alue1>4 <field_name0> 8 <new_2alue0>555

9here <field_name1> 8 <condition_2alue1> and

<field_name0> 8 <condition_2alue0>555;

)3 *%!AE `sample1` #E ` name` 8 6marco elias

palic 2alencia164àddress` 8 6porac4 pampan7a16

where name` 8 6marco elias palic 2alencia6 and

àddress` 8 6porac4 pampan7a6;

39



yS"# *ommands

• 1elete a record.

A: Without a condition:

Synta)3 !E&EE from <table_name>;

)3 !E&EE from `sample1`;

40



yS"# *ommands

• 1elete a record.

B: With a condition: Synta)3 !E&EE from <table_name> where

<field_name1> 8 <condition_2alue1> and

<field_name0> 8 <condition_2alue0>555;

)3 !E&EE :R$/ `sample1` 9-ERE `name` 8 6marco

elias palic 2alencia6 A! àddress` 8 6porac4

pampan7a6;

41

S"# * d



yS"# *ommands• 5ieing , Searching or record6s7

A: Viewing all records: Synta)3

#E&EC <field1>4 <field0> 555 from <table_name>;

or if you want to select all !elds 1ust type =#asterisk$ #E&EC from <table_name>;

)3

#E&EC `name`4àddress` from `sample1`; or #E&EC from `sample1`;

42

S"# * d




B: Searching for a particular record: Synta)3

#E&EC <field1>4 <field0> 555 from <table_name>

where <field1>8<condition_2alue1> and

<field0>8<condition_2alue0>555;

or if you want to select all !elds 1ust type = #asterisk$

#E&EC from <table_name> where

<field1>8<condition_2alue1> and<field0>8<condition_2alue0>555;

43

S"# * d




B: Searching for a particular record: )3

#E&EC `name`4àddress` :R$/ `sample1`

9-ERE `name` 8 6marco elias palic 2alencia6

A! àddress` 8 6porac4 pampan7a6;

or

#E&EC :R$/ `sample1` 9-ERE `name` 8

6marco elias palic 2alencia6 A! àddress` 8

6porac4 pampan7a6;

44



Name of Book 45



Securing the Initial MySQLAccounts

• Deleting the Anonymous %ser Account

m'sl> !E&EE :R$/ m'sl5user 9-ERE *ser 8 66;

m'sl> :&*#- %R3,3&EE#;

• Assigning a +assword to the &oot Accountm'sl> *%!AE m'sl5user #E %assword 8 %A##9$R!(6newpwd 6)

=> 9-ERE *ser 8 6root6;

m'sl> :&*#- %R3,3&EE#;

• 4he password assigned to the rootaccount and other user accounts is casesensiti"e

46



.reating %sers

• A pro8y is someone or something that actsor performs a request for another person

• .reate a separate account for each Web

application that needs to access adatabase

• %se a RA statement to create useraccounts and assign pri"ileges

• 9rivileges are the operations that a usercan perform with a database

47



.reating %sers #continued$

48

Table 8-2 $ommon #y%&' database priileges



RA Statement

• 4he synta) for the RA statement is3RA privilege (column)? 4 privilege (columns)?? 555

$ @table 5 database5B

$ user 3!E3:3E! " 6 password 6?;

• 4he RA statement creates the useraccountif it does not e)ist and assigns the speci!edpri"ileges

• If the user account already e)ists* theRA statement 1ust updates the pri"ileges

49



&e"oking +ri"ileges

• 4he synta) for the RE,$DE statement is3RE,$DE privilege (column)? 4 privilege (columns)?? 555

$ @table 5 database5B

:R$/ user ;

• 4he RE,$DE A&& %R3,3&EE# statementremo"es all pri"ileges from a useraccount for a speci!ed table or database

• >ou must be logged in with the root

account or ha"e su0cient pri"ileges tore"oke pri"ilegesfrom another user account

50



Deleting %sers

• 4o delete a user3 – &e"oke all pri"ileges assigned to the user

accountfor all databases

– %se the RE,$DE A&& %R3,3&EE# statement – ?iew the pri"ileges assigned to a user account

with the #-$9 RA# :$R user statement

• 4o delete an e)isting user* use the !R$% *#ER statement

• %se the !R$% *#ER user statement todelete the account from the user table inthe m'sl database

51



Specifying @ield Data 4ypes

52

Table 8-3 $ommon #y%&' data types

S if i @i ld D t 4



Specifying @ield Data 4ypes#continued$

53

Table 8-3 $ommon #y%&' data types (continued)



Sorting Query &esults

• %se the $R!ER " keyword with the#E&EC statement to perform analphanumeric sort of the results

returned from a querym'sl> #E&EC mae4 model :R$/ in2entor' $R!ER " mae4 model;

• 4o perform a re"erse sort* add the !E#C keyword after the name of the !eld by

whichyou want to perform the sortm'sl> #E&EC mae4 model :R$/ in2entor' $R!ER " mae !E#C4

model;

54



@iltering Query &esults

• 4he criteria portion of the #E&EC statement determines which !elds toretrie"e from a table

• >ou can also specify which records to returnby using the 9-ERE keywordm'sl> #E&EC :R$/ in2entor' 9-ERE mae86/artin6;

• %se the keywords A! and $R to specify

more detailed conditions about the recordsyou want to returnm'sl> #E&EC :R$/ in2entor' 9-ERE mae869ashburn6

=> A! price<F..;

55



.hapter

Manipulating MySQLDatabases with +B+



+B+ ,"er"iew

• +B+ has the ability to access andmanipulate any database that is ,D/.compliant

• +B+ includes functionality that allowsyou to work directly with diCerent typesof databases* without going through,D/.

• +B+ supports SQLite* databaseabstraction layer functions* and +A& D/

57



nabling MySQL Support in +B+

• ,n %<I7Linu) systems3 – .on!gure +B+ to use the m'sli e)tension

by specifying the ==with=m'sli parameterwhen you run the confi7ure commandduring installation

• ,n Windows3 – .opy the !les libm'sl5dll andphp_m'sli5dll to the installation directory

– dit the php5ini con!guration !le andenable the eGtension8php_m'sli5dll directi"e

58

, i d .l i M SQL



,pening and .losing a MySQL.onnection

• ,pen a connection to a MySQL databaseser"er with the m'sli_connect() function

• 4he m'sli_connect() function returns a

positi"e integer if it connects to thedatabase successfully or false if it does not

• Assign the return "alue from them'sli_connect() function to a "ariable

that you can use to access the database inyour script

59

, i d .l i M SQL



,pening and .losing a MySQL.onnection #continued$

• 4he synta) for the m'sli_connect() function is3

Hconnection 8 m'sli_connect(IhostI4 Iuser I4 I password I4 IdatabaseI?)

=use isam5sis5pitt5edu for host and 'our acct username+psword

• 4he host argument speci!es the host namewhere your MySQL database ser"er isinstalled

• 4he user and password arguments specify a

MySQL account name and password• 4he database argument selects a database

with which to work

60

, i d .l i M SQL




+able :-; yS"# server inormation unctions

61

, i d .l i M SQL




Figure :-; yS"#)no<php in a $ebbroser

62



Selecting a Database

• Select a database with the usedatabase statement when you log onto the MySQL Monitor

• 4he synta) for them'sli_select_db() function is3

m'sli_select_db(connection4 database)

• 4he function returns a "alue of true if

it successfully selects a database orfalse if itdoes not

63



Bandling MySQL rrors

• &easons for not connecting to adatabase ser"er include3

– 4he database ser"er is not running

– Insu0cient pri"ileges to access the datasource

– In"alid username and7or password

64

Bandling MySQL rrors



Bandling MySQL rrors#continued$

• Make sure you are using a "alidusername and password

65

Figure *-2 +atabase connection error message

Suppressing rrors with the rror



Suppressing rrors with the rror.ontrol ,perator

• Writing code that anticipates andhandles potential problems is oftencalled bulletproong

• /ulletproo!ng techniques include3 – ?alidating submitted form data

– %sing the error control operator 6=7

to suppress error messages

66



4erminating Script )ecution

• 4he die() and eGit() functionsterminate script e)ecution

• 4he die() "ersion is usually used when

attempting to access a data source• /oth functions accept a single string

argument

• .all the die() and eGit() functions as

separate statements or by appendingeither function to an e)pression with the$r operator

67




4erminating Script )ecution#continued$

H!"Connect 8 Jm'sli_connect(IlocalhostI4 IrootI4 IparisI);

if (KH!"Connect)

die("The database server is not available.");

echo I#uccessfull' connected to the database ser2er5<+p>I;

H!"#elect 8 Jm'sli_select_db(H!"Connect4 Ifli7htlo7I);if (KH!"#elect)

die("The database is not available.");

echo I#uccessfull' opened the database5<+p>I;

++ additional statements that access the database

m'sli_close(H!"Connect);

68




4erminating Script )ecution#continued$

H!"Connect 8 Jm'sli_connect(IlocalhostI4 Idon7osselinI4

IrosebudI)

Or die("The database server is not available.");


Jm'sli_select_db(H!"Connect4 Ifli7htlo7I)Or die("The database is not available.");


++ additional statements that access the database server


69



&eporting MySQL rrors

+able :-> yS"# error reporting unctions

70




&eporting MySQL rrors#continued$

H*ser 8 H_E6username6?;

H%assword 8 H_E6password6?;

H!"Connect 8 Jm'sli_connect(IlocalhostI4 H*ser4 H%assword)

Or die("Unable to connect to the database server."

. "Error code " . mysqliconnecterrno(). "! " . mysqliconnecterror()) . "";


Jm'sli_select_db(H!"Connect4 Ifli7htlo7I)

$r die(Ihe database is not a2ailable5<+p>I);




71





72

Figure *-! Error number and message generated by

an inalid username and password





H*ser 8 H_E6username6?;

H%assword 8 H_E6password6?;

H!"Connect 8 Jm'sli_connect(IlocalhostI4 H*ser4 H%assword)

$r die(I*nable to connect to the database ser2er5<+p>I

5 IError code I 5 m'sli_connect_errno()

5 IL I 5 m'sli_connect_error()) 5 I<+p>I;


Jm'sli_select_db(H!"Connect4 Ifli7htplanI)

Or die("Unable to select the database."

. "Error code " . mysqlierrno(#$%onnect)

. "! " . mysqlierror(#$%onnect)) . "";echo I#uccessfull' opened the database5<+p>I;



73





74

Figure *-" Error code and message generated when

attempting to select a database that does not e,ist



)ecuting SQL Statements

• %se the m'sli_uer'() function to sendSQL statements to MySQL

• 4he synta) for the m'sli_uer'() function is3 m'sli_uer'(connection4 query )

• 4he m'sli_uer'() function returnsone of three "alues3 –

@or SQL statements that do not return results#CREAE !AA"A#E and CREAE A"&E statements$ it returns a "alue of true if thestatement e)ecutes successfully

75

)ecuting SQL Statements



)ecuting SQL Statements#continued$

– @or SQL statements that return results##E&EC and #-$9 statements$ them'sli_uer'() function returns a resultpointer that represents the query results

• A result pointer is a special type of "ariablethat refers to the currently selected row in aresultset

– 4he m'sli_uer'() function returns a

"alue of false for any SQL statements thatfail* regardless of whether they returnresults

76



Working with Query &esults

+able :-? *ommon 9@9 unctions or accessingdatabase results

77

&etrie"ing &ecords into an



&etrie"ing &ecords into anInde)ed Array

• 4he m'sli_fetch_row() functionreturns the !elds in the current row of aresultset into an inde)ed array andmo"es the result pointer to the ne)t row

echo I<table width861..MN border8616>I;

echo I<tr><th>/ae<+th><th>/odel<+th>

<th>%rice<+th><th>Ouantit'<+th><+tr>I;

&o' mysqlietchro'(*+ery&es+lt);do @

echo I<tr><td>@&o',-B<+td>I;

echo I<td>@&o',B<+td>I;echo I<td ali7n86ri7ht6>@&o',0B<+td>I;echo I<td ali7n86ri7ht6>@&o',1B<+td><+tr>I;&o' mysqlietchro'(*+ery&es+lt);B while (HRow);

78




&etrie"ing &ecords into anInde)ed Array #continued$

79

Figure *- Output o the inentory table in a .eb browser




&etrie"ing &ecords into anAssociati"e Array

• 4he m'sli_fetch_assoc() functionreturns the !elds in the current row of aresultset into an associati"e array andmo"es the result pointer to the ne)t row

• 4he diCerence betweenm'sli_fetch_assoc() andm'sli_fetch_row() is that instead ofreturning the !elds into an inde)ed array*

the m'sli_fetch_assoc() functionreturns the !elds into an associate arrayand uses each !eld name as the array key

80

Accessing Query &esult



Accessing Query &esultInformation

• 4he m'sli_num_rows() functionreturns the number of rows in aquery result

• 4he m'sli_num_fields() functionreturns the number of !elds in aquery result

• /oth functions accept a databaseconnection "ariable as an argument

81

Accessing Query &esult Information



Accessing Query &esult Information#continued$

H#O&strin7 8 I#E&EC :R$/ in2entor'I;HOuer'Result 8 Jm'sli_uer'(H!"Connect4 H#O&strin7)

$r die(I*nable to eGecute the uer'5<+p>I

5 IError code P 5 m'sli_errno(H!"Connect)

5 IL I 5 m'sli_error(H!"Connect)) 5 I<+p>I;

echo I#uccessfull' eGecuted the uer'5<+p>I;

2+m&o's mysqlin+mro's(*+ery&es+lt);2+m3ields mysqlin+mields(*+ery&es+lt);i (2+m&o's 4 - 55 2+m3ields 4 -)

echo "6o+r q+ery ret+rned 7 . mysqlin+mro's(*+ery&es+lt) . 7 ro's and "

. mysqlin+mields(*+ery&es+lt) . 7 ields.";elseecho "6o+r q+ery ret+rned no res+lts.";


82

Accessing Query &esult Information



Accessing Query &esult Information#continued$

83

Figure *-8 Output o the number o rows and ields

returned rom a /uery

.l i Q & lt



.losing Query &esults

• When you are !nished working withquery results retrie"ed with them'sli_uer'() function* use the

m'sli_free_result() function toclose the resultset

• 4o close the resultset* pass to the

m'sli_free_result() function the"ariable containing the result pointerfrom the m'sli_uer'() function

84

. ti d D l ti D t b



.reating and Deleting Databases

• %se the CREAE !AA"A#E statementwith the m'sli_uer'() function tocreate a new database

8*9strin: "%&ETE #T$8E realestate";

HOuer'Result 8 Jm'sli_uer'(H!"Connect4 H#O&strin7)


5 IError code I 5 m'sli_errno(H!"Connect)

5 IL I 5 m'sli_error(H!"Connect)) 5 I<+p>I;echo I#uccessfull' eGecuted the uer'5<+p>I;


85




.reating and Deleting Databases#continued$

86

Figure *-* Error code and message that prints when you attempt

to create a database that already e,ists





• %se the m'sli_db_select() function tocheck whether a database e)ists before youcreate or delete it

• 4o use a new database* you must select it bye)ecuting the m'sli_select_db() function

• Deleting a database is almost identical tocreating one* e)cept use the !R$% !AA"A#E

statement instead of the CREAE !AA"A#E statement with the m'sli_uer'() function

87





H!"ame 8 Ireal_estateI;

555

if (JKm'sli_select_db(H!"Connect4 H!"ame))

echo Ihe H!"ame database does not eGistK<+p>I;

else @

8*9strin: "#&O #T$8E #$2ame";HOuer'Result 8 Jm'sli_uer'(H!"Connect4 H#O&strin7)



5 IL P 5 m'sli_error(H!"Connect)) 5 I<+p>I;

echo I#uccessfull' deleted the database5<+p>I;

B


88

. ti d D l ti 4 bl



.reating and Deleting 4ables

• 4o create a table* use the CREAE A"&E statement with the m'sli_uer'() function

• )ecute the m'sli_select_db() functionbefore e)ecuting the CREAE A"&E statement or the new table might be createdin the wrong database

• 4o pre"ent code from attempting to create atable that already e)ists* use am'sli_uer'() function that attempts toselect records from the table

89




g g#continued$

H!"ame 8 Ireal_estateI;

555

8*9strin: "%&ETE T$9E commercial (city =&%&(0?)@ state

=&%&(0?)@ saleorlease =&%&(0?)@ typeo+se =&%&(A-)@

rice B2T@ siCe B2T)";



5 IError code I 5 m'sli_errno(H!"Connect)


echo I#uccessfull' created the table5<+p>I;


90




g g#continued$

91

Figure *-11 Error code and message that prints when you

attempt to create a table that already e,ists

Adding* Deleting* and %pdating



g* g* p g&ecords

• 4o add records to a table* use the3#ER and ,A&*E# keywords withthe m'sli_uer'() function

• 4he "alues entered in the ,A&*E# listmust be in the same order in whichyou de!ned the table !elds

• >ou must specify *&& in any !eldsfor which you do not ha"e a "alue

92




g* g* p g&ecords #continued$

• 4o add multiple records to a database*use the &$A! !AA statement and them'sli_uer'() function with a local

te)t !le containing the records youwant to add

• 4o update records in a table* use the

*%!AE* #E* and 9-ERE keywordswith the m'sli_uer'() function

93




g* g* p g&ecords #continued$

• 4he *%!AE keyword speci!es the name ofthe table to update

• 4he #E keyword speci!es the "alue to

assign to the !elds in the records thatmatch the condition in the 9-ERE keyword

• 4o delete records in a table* use the!E&EE and 9-ERE keywords with the

m'sli_uer'() function• 4he 9-ERE keyword determines which

records to delete in the table

94

%sing the



gm'sli_affected_rows() @unction

• With queries that return results ##E&EC queries$* use the m'sli_num_rows() function to !nd the number of records

returned from the query• With queries that modify tables but do

not return results #3#ER* *%!AE* and!E&EE queries$* use them'sli_affected_rows() function todetermine the number of aCected rows

95

%sing the m'sli affected rows()



g ' _ _

@unction #continued$

8*9strin: "U#TE inventory 8ET price1D.0-

FE&E maGeH3enderH 2# modelH#IJH";


$r die(I*nable to eGecute the uer'5<+p>I5 IError code I 5 m'sli_errno(H!"Connect)


echo "8+ccess+lly +pdated "

. mysqliaectedro's(#$%onnect) . " record(s).";

96

%sing the m'sli affected rows()



g ' _ _

@unction #continued$

97

Figure *-1 Output o mysqliaectedro's() unction

or an U#TE /uery

%sing the m'sli info()



g ' _

@unction

• @or queries that add or update records* oraltera table5s structure* use the m'sli_info() function to return information about the query

• 4he m'sli_info() function returns thenumber of operations for "arious types ofactions* depending on the type of query

• 4he m'sli_info() function returnsinformation about the last query that wase)ecuted on the database connection

98

%sing the m'sli info() @unction



g ' _

#continued$

• 4he m'sli_info() function returnsinformation about queries that matchone of the following formats3 – 3#ER 3$555#E&EC555

– 3#ER 3$555,A&*E# (555)4(555)4(555)

– &$A! !AA 3:3&E 555

– A&ER A"&E 555

– *%!AE

• @or any queries that do not match oneof these formats* the m'sli_info() function returns an empty string

99




g _

#continued$

8*9strin: "B28E&T B2TO inventory

=9UE8(HOvationH@ HJJJ 9K 9e:endH@ -AL.--@ 0)@

(HOvationH@ HD 8tandard $alladeerH@ DLL.--@ )@

(HOvationH@ HTan:ent 8eries T1?JH@ ?DL.--@ 1)";

HOuer'Result 8 Jm'sli_uer'(H!"Connect4 H#O&strin7)$r die(I*nable to eGecute the uer'5<+p>I



echo I#uccessfull' added the records5<+p>I;

echo "" . mysqliino(#$%onnect) . "";

100




_

#continued$

101

Figure *-10 Output o mysqliino() unction or anB28E&T /uery that adds multiple records




_

#continued$

• 4he m'sli_info() function alsoreturns information for &$A! !AA queries

8*9strin: "9O# #T 9O%9 B23B9E Hc!/temp/inventory.tMtHB2TO T$9E inventory;";





echo I#uccessfull' added the records5<+p>I;

echo "" . mysqliino(#$%onnect) . "";

102

%sing the m'sli_info() @unction



_

#continued$

103

Figure *-18 Output o mysqliino() unction or a

9O# #T /uery



Name of Book 104

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Gconnection: Hmysqlconnect#JlocalhostJ*JrootJ*JJ$K

mysqlselectdb#JmydbJ*Gconnection:$K

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Working with Database.ppt