mysql_query

PHP 4, PHP 5

mysql_query - Send a MySQL query

Code Examples

Example #1 Valid Query

<?php
// This could be supplied by a user, for example
$firstname = 'fred';
$lastname  = 'fox';
// Formulate Query
// This is the best way to perform an SQL query
// For more examples, see mysql_real_escape_string()
$query = sprintf("SELECT firstname, lastname, address, age FROM friends 
    WHERE firstname='%s' AND lastname='%s'",
    mysql_real_escape_string($firstname),
    mysql_real_escape_string($lastname));
// Perform Query
$result = mysql_query($query);
// Check result
// This shows the actual query sent to MySQL, and the error. Useful for debugging.
if (!$result) {
    $message  = 'Invalid query: ' . mysql_error() . "\n";
    $message .= 'Whole query: ' . $query;
    die($message);
}
// Use result
// Attempting to print $result won't allow access to information in the resource
// One of the mysql result functions must be used
// See also mysql_result(), mysql_fetch_array(), mysql_fetch_row(), etc.
while ($row = mysql_fetch_assoc($result)) {
    echo $row['firstname'];
    echo $row['lastname'];
    echo $row['address'];
    echo $row['age'];
}
// Free the resources associated with the result set
// This is done automatically at the end of the script
mysql_free_result($result);

1
2
<?php
// This could be supplied by a user, for example
 
 
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Example #2 Invalid Query

1
2
<?php
$result = mysql_query('SELECT * WHERE 1=1');
 
 
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mysql_query

Example #1 Valid Query

Example #2 Invalid Query

Function mysql_query:

Original MySQL API Functions

Most used PHP functions