MyBlog = http://excellentprogramming.blogspot.com

PHP WITH MYSQL PART1CRUD- create, read, update, delete

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MyBlog = http://excellentprogramming.blogspot.com

PHP DATABASE INTERACTION Connecting to a database includes five steps.

Everytime you want to interact with database you must go through these five steps. These five steps as below Create a connection Select the database Perform databse query Use returned data / insert / updae / delete the

data. Close the connection

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MyBlog = http://excellentprogramming.blogspot.com

CREATE CONNECTION To connect your database you need your

credentials like user name, pass word and your server where your database is hosted.

Be carefull about those information those you are providing . It must be as exact as you get from your service provider or you cerated.

I will show you to work with database using “mysql” group of functions.

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MyBlog = http://excellentprogramming.blogspot.com

CONTINUE .... To connect to database we use

mysql_connect(“servername”,“username”,“password”); Servername = It must be “localhost” or else your domain

name Username = you must have a user account to connect to

your database. Password = you must have password to authenticate your

self to connect to your database. When we are connecting to database we have to

check that if any error occurs and unable to connect to database we must catch that for our testing purpose. We will do that with a if condition test.

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MyBlog = http://excellentprogramming.blogspot.com

CONNECTION ERROR FINDING

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MyBlog = http://excellentprogramming.blogspot.com

$SELECT DATABASE($MYSQL_SELECT_DB(X,Y)) To select the databse we must need two things

Databse name and Connection string mysql_select_db(“$database",$connect);

$databse= you have to write the name of your database you wanto connect

$connect = here we are passing the connection string like Servername Username Password

Here we must do a error testing. As we did for connection

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DATABASE SELECTING ERROR FINDING

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ayak

MyBlog = http://excellentprogramming.blogspot.com

PERFORM DATABASE QUERY To perform a query operation we have to pass

a query string to the function “mysql_query(“$query”, $connect)”. $query may be a dtabse query like

“SELECT * FROM [table name] [condition]” “SELECT [column name] FROM [table name] [condition]”.

$connect = connection string which holds your Servername Username password

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MyBlog = http://excellentprogramming.blogspot.com

QUERY ERROR FINDING As we did a test for connecting to database

selecting a database we will do a test for query action. To do that we will uses if() a follows. if(!$result){die("Sorry, Unable to fetch

record".mysql_error());} Here it checks the function is really fecthing the

record or some errors there in our query function.

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USE RETURNED DATA In this level you can insert, delete or update the

data. I will show you the fetched data here. You must

follow the mysql referece or some mysqlbooks for more. while($row=mysql_fetch_array($result)){

$pid=$row["p_id"];$linkid=$row["linklabel"];$content=$row["pagebody"]; echo $pid . “ ” . $linkid. “ ” . $content ; }Here “pid”, ”linklabe”, ”pagebody” are the coloumn names of the table.

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CLOSE THE CONNECTION When our task will complete we will close the

database conncetion

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MyBlog = http://excellentprogramming.blogspot.com

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