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❮ PHP MySQLi Reference

Example – Object Oriented style

Perform query against a database:

$mysqli = new mysqli(“localhost”,”my_user”,”my_password”,”my_db”);

// Check connection
if ($mysqli -> connect_errno) {
  echo “Failed to connect to MySQL: ” . $mysqli -> connect_error;
 
exit();
}



// Perform query
if ($result = $mysqli -> query(“SELECT * FROM Persons”))
{
  echo “Returned rows are: ” . $result -> num_rows;
 
// Free result set
  $result -> free_result();
}




$mysqli -> close();
?>


Look at example of procedural style at the bottom.

Definition and Usage

The query() / mysqli_query() function performs a query against a database.

Syntax

Object oriented style:

$mysqli -> query(query,
resultmode)

Procedural style:

mysqli_query(connection, query, resultmode)

Parameter Values

Parameter Description
connection Required. Specifies the MySQL connection to use
query Required. Specifies the SQL query string
resultmode

Optional. A constant. Can be one of the following:

  • MYSQLI_USE_RESULT (Use this to retrieve large amount of data)
  • MYSQLI_STORE_RESULT (This is default)

Technical Details

Return Value: For successful SELECT, SHOW, DESCRIBE, or EXPLAIN queries it will return a mysqli_result object. For other successful queries it will return TRUE. FALSE on failure
PHP Version: 5+
PHP Changelog: PHP 5.3.0 added the ability for async queries

Example – Procedural style

Perform query against a database:

$con = mysqli_connect(“localhost”,”my_user”,”my_password”,”my_db”);

if (mysqli_connect_errno()) {
  echo “Failed to connect to MySQL: ” . mysqli_connect_error();
 
exit();
}


// Perform query
if ($result = mysqli_query($con, “SELECT * FROM Persons”))
{
  echo “Returned rows are: ” . mysqli_num_rows($result);
 
// Free result set
  mysqli_free_result($result);
}




mysqli_close($con);
?>


❮ PHP MySQLi Reference