MySQL SELECT Query Using PHP Scripts

MySQL SELECT Query Using PHP Scripts

SELECT statement is used to select the records from database tables.

Syntax: 

SELECT column1_name, column2_name, columnN_name FROM table_name;

To select all the columns

SELECT * FROM table_name 

Consider our table has the following records:

+—-+————+———–+————————–+

| id | first_name | last_name | email                    |
+—-+————+———–+————————–+
|  1 | Sabbir     | Rahaman   |sabbirrahaman@mail.com    |
|  2 | John       | Carter    |mahinchowdhury@mail.com   |
|  3 | Sadman     | Faijul    | sadmanfaijul@mail.com    |
|  4 | Mr.        | Zami      | zami009@mail.com         |
|  5 | John       | Potter    | johnpotter@mail.com      |
+—-+————+———–+————————–+

MySQLi Procedural 

<?php
/* Attempt MySQL server connection. Assuming you are running MySQL
server with default setting (user 'root' with no password) */

$link = mysqli_connect("localhost", "root", "", "demo");

// Check connection
if($link === false){
die("ERROR: Could not connect. " . mysqli_connect_error());
}

// Attempt select query execution
$sql = "SELECT * FROM persons";
if($result = mysqli_query($link, $sql)){
if(mysqli_num_rows($result) > 0){
echo "<table>";
echo "<tr>";
echo "<th>id</th>";
echo "<th>first_name</th>";
echo "<th>last_name</th>";
echo "<th>email</th>";
echo "</tr>";
while($row = mysqli_fetch_array($result)){
echo "<tr>";
echo "<td>" . $row['id'] . "</td>";
echo "<td>" . $row['first_name'] . "</td>";
echo "<td>" . $row['last_name'] . "</td>";
echo "<td>" . $row['email'] . "</td>";
echo "</tr>";
}
echo "</table>";
// Free result set
mysqli_free_result($result);
} else{
echo "No records matching your query were found.";
}
} else{
echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}

// Close connection
mysqli_close($link);
?>

MySQLi Object Oriented 

<?php
/* Attempt MySQL server connection. Assuming you are running MySQL
server with default setting (user 'root' with no password) */

$mysqli = new mysqli("localhost", "root", "", "demo");

// Check connection
if($mysqli === false){
die("ERROR: Could not connect. " . $mysqli->connect_error);
}

// Attempt select query execution
$sql = "SELECT * FROM persons";
if($result = $mysqli->query($sql)){
if($result->num_rows > 0){
echo "<table>";
echo "<tr>";
echo "<th>id</th>";
echo "<th>first_name</th>";
echo "<th>last_name</th>";
echo "<th>email</th>";
echo "</tr>";
while($row = $result->fetch_array()){
echo "<tr>";
echo "<td>" . $row['id'] . "</td>";
echo "<td>" . $row['first_name'] . "</td>";
echo "<td>" . $row['last_name'] . "</td>";
echo "<td>" . $row['email'] . "</td>";
echo "</tr>";
}
echo "</table>";
// Free result set
$result->free();
} else{
echo "No records matching your query were found.";
}
} else{
echo "ERROR: Could not able to execute $sql. " . $mysqli->error;
}

// Close connection
$mysqli->close();
?>

PDO 

<?php
/* Attempt MySQL server connection. Assuming you are running MySQL
server with default setting (user 'root' with no password) */

try{
$pdo = new PDO("mysql:host=localhost;dbname=demo", "root", "");
// Set the PDO error mode to exception
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e){
die("ERROR: Could not connect. " . $e->getMessage());
}

// Attempt select query execution
try{
$sql = "SELECT * FROM persons";
$result = $pdo->query($sql);
if($result->rowCount() > 0){
echo "<table>";
echo "<tr>";
echo "<th>id</th>";
echo "<th>first_name</th>";
echo "<th>last_name</th>";
echo "<th>email</th>";
echo "</tr>";
while($row = $result->fetch()){
echo "<tr>";
echo "<td>" . $row['id'] . "</td>";
echo "<td>" . $row['first_name'] . "</td>";
echo "<td>" . $row['last_name'] . "</td>";
echo "<td>" . $row['email'] . "</td>";
echo "</tr>";
}
echo "</table>";
// Free result set
unset($result);
} else{
echo "No records matching your query were found.";
}
} catch(PDOException $e){
die("ERROR: Could not able to execute $sql. " . $e->getMessage());
}

// Close connection
unset($pdo);
?>

In the above example the PHP code selects all the data stored in the persons table

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