W3s sql php

Select Data From a MySQL Database

The SELECT statement is used to lớn select data from one or more tables:

To learn more about Squốc lộ, please visit our Squốc lộ tutorial.

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Select Data With MySQLi

The following example selects the id, firstname và lastname columns from the MyGuests table and displays it on the page:

connect_error) $sql = "SELECT id, firstname, lastname FROM MyGuests";$result = $conn->query($sql);if ($result->num_rows > 0) } else $conn->close(); ?>

Code lines lớn explain from the example above:

First, we mix up an Squốc lộ query that selects the id, firstname & lastname columns from the MyGuests table. The next line of code runs the query & puts the resulting data inlớn a variable called $result.

Then, the function num_rows() checks if there are more than zero rows returned.

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If there are more than zero rows returned, the function fetch_assoc() puts all the results inkhổng lồ an associative array that we can loop through. The while() loop loops through the result phối và outputs the data from the id, firstname và lastname columns.

The following example shows the same as the example above, in the MySQLi procedural way:

Example (MySQLi Procedural)

0) } else mysqli_close($conn); ?>
Run example »

You can also put the result in an HTML table:

Example (MySQLi Object-oriented)

connect_error) $sql = "SELECT id, firstname, lastname FROM MyGuests";$result = $conn->query($sql);if ($result->num_rows > 0)   emang đến "";} else $conn->close(); ?>
Run example »

Select Data With PDO (+ Prepared Statements)

The following example uses prepared statements.

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It selects the id, firstname & lastname columns from the MyGuests table and displays it in an HTML table:

Example (PDO)

"; emang lại "IdFirstnameLastname";class TableRows extends RecursiveIteratorIterator   function current()   function beginChildren()   function endChildren() } $servername = "localhost"; $username = "username";$password = "password";$dbname = "myDBPDO"; try } catch(PDOException $e) $conn = null;emang đến "";?>
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