Change language

How to connect multiple MySQL databases on one web page?

This article explains how to connect multiple MySQL databases to one web page. This is useful for accessing data from multiple databases. 
There are two ways to connect multiple MySQL databases to one web page:
  • Using MySQLi (MySQL Enhanced)
  • Using PDO (PHP Data Objects)
Syntax:
  • MySQLi procedural syntax:
    $link = mysqli_connect (“host_name”, “user_name”, “password”, “database_name”);
  • MySQLi object oriented syntax:
    $link = new mysqli (“host_name”, “user_name”, “password”, “database_name”);
  • PDO (PHP Data Objects) syntax:
    $pdo = new PDO (“mysql: host = host_name; dbname = database_name”, “user_name”, “password”);
Program:This program uses MySQLi to connect multiple databases on one web page.
// PHP program for connecting multiple MySQL databases
// into one web page 
// Connect the first database
// Database name = > database1
// Default username for localhost = > root
// The default password for localhost is ’ ’ (none) $link1 = mysqli_connect ( "localhost" , "root" , "" , "database1" ) ;  
// Test the connection if ( $link1 = = true) { echo " database1 Connected Successfully " ; } else { die ( "ERROR: Could not connect" . mysqli_connect_error()); } echo "
"
;  
// Connect the first database
// Database name = > database1 $link2 = mysqli_connect ( "localhost" , "root" , "" , "database2" );  
// Test the connection if ( $link2 = = true) { echo " database2 Connected Successfully " ; } else { die ( "ERROR: Could not connect" . mysqli_connect_error()); } echo "

Display the list of all Databases:
"
;  
// Database connection $link = mysqli_connect ( ’localhost’ , ’root’ , ’ ’ );  
// List all database names $res = mysqli_query ( $link , "SHOW DATABASES" ); while ( $row = mysqli_fetch_assoc ( $res )) { echo $row [ ’Database’ ]. "
"
; }  
?>
Output:

Shop

Learn programming in R: courses

$

Best Python online courses for 2022

$

Best laptop for Fortnite

$

Best laptop for Excel

$

Best laptop for Solidworks

$

Best laptop for Roblox

$

Best computer for crypto mining

$

Best laptop for Sims 4

$

Latest questions

NUMPYNUMPY

Common xlabel/ylabel for matplotlib subplots

12 answers

NUMPYNUMPY

How to specify multiple return types using type-hints

12 answers

NUMPYNUMPY

Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

12 answers

NUMPYNUMPY

Flake8: Ignore specific warning for entire file

12 answers

NUMPYNUMPY

glob exclude pattern

12 answers

NUMPYNUMPY

How to avoid HTTP error 429 (Too Many Requests) python

12 answers

NUMPYNUMPY

Python CSV error: line contains NULL byte

12 answers

NUMPYNUMPY

csv.Error: iterator should return strings, not bytes

12 answers


Wiki

Python | How to copy data from one Excel sheet to another

Common xlabel/ylabel for matplotlib subplots

Check if one list is a subset of another in Python

sin

How to specify multiple return types using type-hints

exp

Printing words vertically in Python

exp

Python Extract words from a given string

Cyclic redundancy check in Python

Finding mean, median, mode in Python without libraries

cos

Python add suffix / add prefix to strings in a list

Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

Python - Move item to the end of the list

Python - Print list vertically