Hack Industries
Would you like to react to this message? Create an account in a few clicks or log in to continue.
Latest topics
» Soiler code with css and javascript
Create a PHP Database EmptyWed Jan 27, 2010 2:45 pm by Stoned Hacker

» Forum Rules
Create a PHP Database EmptyTue Jan 26, 2010 2:07 pm by Stoned Hacker

» HTML Headings, Attributes & Paragraphs
Create a PHP Database EmptyThu Dec 10, 2009 3:45 pm by Stoned Hacker

» A Simple Virus
Create a PHP Database EmptyThu Dec 10, 2009 1:57 pm by Stoned Hacker

» Comment Box
Create a PHP Database EmptyThu Dec 10, 2009 1:53 pm by Stoned Hacker

» Create a PHP Database
Create a PHP Database EmptyThu Dec 10, 2009 1:51 pm by Stoned Hacker

» How to insert Javascript
Create a PHP Database EmptyThu Dec 10, 2009 1:12 pm by Stoned Hacker

» Intro to Javascript
Create a PHP Database EmptyThu Dec 10, 2009 12:23 pm by Stoned Hacker

» HTML Basic
Create a PHP Database EmptyThu Dec 10, 2009 12:03 pm by Stoned Hacker

Navigation
 Portal
 Index
 Memberlist
 Profile
 FAQ
 Search
Affiliates
free forum
 

Create a PHP Database

Go down

Create a PHP Database Empty Create a PHP Database

Post  Stoned Hacker Thu Dec 10, 2009 1:51 pm

Create a database
The CREATE DATABASE statement is used to create a database in MySQL.
Syntax:
Code:
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":
Code:
<?php
$con = mysql_connect("localhost","peter","abc123");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

if (mysql_query("CREATE DATABASE my_db",$con))
  {
  echo "Database created";
  }
else
  {
  echo "Error creating database: " . mysql_error();
  }

mysql_close($con);
?>
Create a table
Code:
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

The following example creates a table named "Persons", with three columns. The column names will be "FirstName", "LastName" and "Age":
Code:
<?php
$con = mysql_connect("localhost","peter","abc123");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

// Create database
if (mysql_query("CREATE DATABASE my_db",$con))
  {
  echo "Database created";
  }
else
  {
  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);
?>
Important: A database must be selected before a table can be created. The database is selected with the mysql_select_db() function.

Note: When you create a database field of type varchar, you must specify the maximum length of the field, e.g. varchar(15).
The data type specifies what type of data the column can hold. For a complete reference of all the data types available in MySQL, go to our complete Data Types reference.

Primary Keys and Auto Increment Fields
Each table should have a primary key field.

A primary key is used to uniquely identify the rows in a table. Each primary key value must be unique within the table. Furthermore, the primary key field cannot be null because the database engine requires a value to locate the record.

The following example sets the personID field as the primary key field. The primary key field is often an ID number, and is often used with the AUTO_INCREMENT setting. AUTO_INCREMENT automatically increases the value of the field by 1 each time a new record is added. To ensure that the primary key field cannot be null, we must add the NOT NULL setting to the field.
EXAMPLE:
Code:
$sql = "CREATE TABLE Persons
(
personID int NOT NULL AUTO_INCREMENT,
PRIMARY KEY(personID),
FirstName varchar(15),
LastName varchar(15),
Age int
)";

mysql_query($sql,$con);
Stoned Hacker
Stoned Hacker
Administrator
Administrator

Posts : 22
Join date : 2009-11-21
Age : 35
Location : The Internet

http://hackindustries.tk

Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum