Php mysq

MySQL COMMANDS AND QUERYING
Prasanna Pabba
15071D2510
1
https://www.youtube.com/watch?v=mpQts3ezPVg
What and Why Iam Teaching:
Mysql commands and Quering In
PHP-MYSQL
To build carrer in the web development

Prasanna Pabba 15071D2510 SCRIPTING LANGUAGES MTECH 1ST YEAR VNRVJIET 2
PHP MySQL Introduction
What is Mysql?
MySql is a Database Server and supports Standard Sql.
Mysql is ideal for both Small and Large applications.
It complies on no of platforms and free to download and use.
What is Php Mysql?
Php combined with Mysql are cross platform(you can develop
in windows and serve on a Unix platform)

CREATE
create databases and tables
SELECT
select table rows based on certain conditions
DELETE
delete one or more rows of a table
INSERT
Insert a new row in a table
UPDATE
update rows in a table
Where
This clause is used to extract on those records that fullfill a specified Criterion
OrderBy
OrderBy Keyword is used to sort the data in a record set
Basic Commands On PHP MySql

Quering Mysql
Queries
A query is a question or a request.
With MySQL, we can query a database for
specific information and have a recordset
returned.
Look at the following query:
SELECT LastName FROM Persons
The query above selects all the data in the
"LastName" column from the "Persons"
table, and will return a recordset like this:
LastName
Griffin
Quagmire

PHP MySql Connect To a DataBase
Create a Connection to a MySQL Database
Before you can access data in a database, you must create a connection to the
database.
In PHP, this is done with the mysql_connect() function.
Syntax
mysql_connect(servername,username,password);
Parameter Description
Servername Optional. Specifies the server to connect to. Default value is
"localhost:3306“
Username Optional. Specifies the username to log in with. Default value
is the name of the user that owns the server process
passwordOptional. Specifies the password to log in with. Default is “"

Sample Example For Mysql Connect
Example
In the following example we store the connection in a variable
($con) for later use in the script. The "die" part will be executed
if the connection fails:
<?php
$con = mysql_connect("localhost","peter","abc123");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
// some code
?>

PHP MySQL Create Database and Tables
CREATE DATABASE database_name
To get PHP to execute the statement above we must use the mysql_query() function.
This function is used to send a query or command to a MySQL connection.
Example
The following example creates a database called "my_db":
<?php
if (!$con)
{
}
if (mysql_query("CREATE DATABASE my_db",$con))
{
echo "Database created";
}
else
{
echo "Error creating database: " . mysql_error();
}
mysql_close($con);
?>
Output:
Database Created

PHP Mysql Create a Table
The CREATE TABLE statement is used to create a table in
MySQL.
Syntax
CREATE TABLE table_name
(column_name1 data_type,
column_name2 data_type,
column_name3 data_type,....)
We must add the CREATE TABLE statement to the
mysql_query() function to execute the command

Example Of a Create Table
The following example creates a table named "Persons", with three columns. The column names will be "FirstName", "LastName" and "Age":
<?php
if (!$con)
{
}
// Create database
if (mysql_query("CREATE DATABASE my_db",$con))
{
echo "Database created";
}
else Output
{ FirstName LastName Age
echo "Error creating database: " . mysql_error();
}
// Create table
mysql_select_db("my_db", $con);
$sql = "CREATE TABLE Persons
(
FirstName varchar(15),
LastName varchar(15),
Age int
)";
// Execute query
mysql_query($sql,$con);
mysql_close($con);
?>

PHP MySQL Insert Into
Insert Data Into a Database Table
The INSERT INTO statement is used to add new records to a database
table.
Syntax
It is possible to write the INSERT INTO statement in two forms.
The first form doesn't specify the column names where the data will
be inserted, only their values:
INSERT INTO table_name
VALUES (value1, value2, value3,...)
The second form specifies both the column names and the values to
be inserted:
INSERT INTO table_name (column1, column2, column3,...)
VALUES (value1, value2, value3,...)
To get PHP to execute the statements above we must use the
mysql_query() function. This function is used to send a query or
command to a MySQL connection

Example of a insert into
<?php
if (!$con)
{
}
mysql_query("INSERT INTO Persons
(FirstName, LastName, Age)
VALUES ('Peter', 'Griffin', '35')");
mysql_query("INSERT INTO Persons
(FirstName, LastName, Age)
VALUES ('Glenn', 'Quagmire', '33')");
mysql_close($con);
?>
Output: Persons
FirstName LastName Age
Peter Griffin 35
Glenn Quagmire 33

PHP MySQL Select
Select Data From a Database Table
The SELECT statement is used to select data
from a database.
Syntax
SELECT column_name(s)
FROM table_name
To get PHP to execute the statement above
we must use the mysql_query() function. This
function is used to send a query or command
to a MySQL connection.

Example Of Php Mysql select
Example
The following example selects all the data stored in the "Persons" table (The * character selects all the
data in the table):
<?php
if (!$con)
{
}
$result = mysql_query("SELECT * FROM Persons");
while($row = mysql_fetch_array($result))
{
echo $row['FirstName'] . " " . $row['LastName'];
echo "<br />";
}
mysql_close($con);
?>
Output:
Peter Griffin
Glenn Quagmire

Display the Result in an HTML Table
The following example selects the same data as the example above, but will display the data in an HTML
table:
<?php
if (!$con)
{
}
$result = mysql_query("SELECT * FROM Persons");
echo "<table border='1'>
<tr>
<th>Firstname</th>
<th>Lastname</th>
</tr>";
{
echo "<tr>";
echo "<td>" . $row['FirstName'] . "</td>";
echo "<td>" . $row['LastName'] . "</td>";
echo "</tr>";
}
echo "</table>";
mysql_close($con);
?>

The output of the code above will be:
FirstName
LastName
Glenn
QuAgmire
Peter Griffin

PHP MySQL The Where Clause
The WHERE clause
The WHERE clause is used to extract only those records that fulfill a
specified criterion.
Syntax
FROM table_name
WHERE column_name operator value
To get PHP to execute the statement above we must use the
mysql_query() function.
This function is used to send a query or command to a MySQL
connection.

Example Of Php Mysql Where Class
example
The following example selects all rows from the "Persons" table where "FirstName='Peter':
<?php
if (!$con)
{
}
$result = mysql_query("SELECT * FROM Persons
WHERE FirstName='Peter'");
{
echo $row['FirstName'] . " " . $row['LastName'];
echo "<br />";
}
?>
The output of the code
above will be:
Peter Griffin

PHP MySQL Order By Keyword
The ORDER BY keyword is used to sort the data in a recordset.
The ORDER BY keyword sort the records in ascending order by
default.
If you want to sort the records in a descending order, you can use
the DESC keyword.
Syntax
FROM table_name
ORDER BY column_name(s) ASC|DESC

Example By OrderBy Clause
Example
The following example selects all the data stored in the "Persons" table, and sorts the result by the "Age" column:
<?php
if (!$con)
{
}
$result = mysql_query("SELECT * FROM Persons ORDER BY age");
{
echo $row['FirstName'];
echo " " . $row['LastName'];
echo " " . $row['Age'];
echo "<br />";
}
mysql_close($con);
?>
The output of the
code above will be:
Glenn Quagmire 33
Peter Griffin 35

PHP MySQL Update
The UPDATE statement is used to modify data in a table.
Update Data In a Database
The UPDATE statement is used to update existing records in a table.
Syntax
UPDATE table_name
SET column1=value, column2=value2,...
WHERE some_column=some_value
Note: Notice the WHERE clause in the UPDATE syntax. The WHERE
clause specifies which record or records that should be updated. If
you omit the WHERE clause, all records will be updated!

Example of Update Clause
The following example updates some data in the "Persons" table:
<?php
if (!$con)
{
}
mysql_query("UPDATE Persons SET Age = '36'
WHERE FirstName = 'Peter' AND
LastName = 'Griffin'");
mysql_close($con);
?>
After the update, the "Persons" table
will look like this:
Peter Griffin 36
Glenn Quagmire 33

PHP MySQL Delete
The DELETE statement is used to delete records in a table.
Delete Data In a Database
The DELETE FROM statement is used to delete records from a
database table.
Syntax
DELETE FROM table_name
WHERE some_column = some_value
Note: Notice the WHERE clause in the DELETE syntax. The WHERE
clause specifies which record or records that should be deleted. If
you omit the WHERE clause, all records will be deleted!

Example Of Deletion
<?php
if (!$con)
{
}
mysql_query("DELETE FROM Persons WHERE LastName='Griffin'");
mysql_close($con);
?>
After the deletion, the table will look like this:
Glenn Quagmire 33

Summary
CREATE
create databases and tables
mysql_query("CREATE DATABASE my_db",$con)
SELECT
select table rows based on certain conditions
INSERT INTO table_name (column1, column2, column3,...)VALUES (value1, value2, value3,...)
DELETE
delete one or more rows of a table
DELETE FROM table_name WHERE some_column = some_value
INSERT
Insert a new row in a table
UPDATE
update rows in a table
UPDATE table_name SET column1=value, column2=value2,...WHEREsome_column=some_value
Where
This clause is used to extract on those records that fullfill a specified Criterion
OrderBy
OrderBy Keyword is used to sort the data in a record set
SELECT column_name(s)FROM table_name ORDER BY column_name(s) ASC|DESC

References
• Beginning Php And Mysql: From Novice To
Professional, 4Th Ed
Head First PHP & MySQL (A Brain-Friendly
Guide) by Lynn Beighley (Author), Michael Morrison
• http://www.w3schools.com/php/php_mysql_intro.asp
• http://www.tutorialspoint.com/php_mysql_online.php

Php mysq

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