sql_cheatsheet2.php

<?php

require 'db_config.php';
/**
 * <?php
 * $servername = "127.0.0.1";
 * $username = "root";
 * $password = "";
 * $dbname = "myDB";
 * ?>
 */
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

////////////////////////////////////////////////////////////////////////////////////////////
// ****DATABASE CREATION *********/////////////////
// Create connection
// $conn = new mysqli($servername, $username, $password);
// Check connection
// if ($conn->connect_error) {
    // die("Connection failed: " . $conn->connect_error);
// } 


// Create database
$sql = "CREATE DATABASE IF EXISTS myDB";
if ($conn->query($sql) === true) {
    echo "Database created successfully";
} else {
    echo "Error creating database: " . $conn->error;
}
//////////////////////////////////
// sql to create table
$sql = "CREATE TABLE IF EXISTS MyGuests (
    id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY, 
    firstname VARCHAR(30) NOT NULL,
    lastname VARCHAR(30) NOT NULL,
    email VARCHAR(50),
    reg_date TIMESTAMP
    )";
    
if ($conn->query($sql) === true) {
    echo "Table MyGuests created successfully";
} else {
    echo "Error creating table: " . $conn->error;
}

//insert data
$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', '[email protected]')";

if ($conn->query($sql) === true) {
    echo "New record created successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

//get last id
$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', '[email protected]')";

if ($conn->query($sql) === true) {
    $last_id = $conn->insert_id;
    echo "New record created successfully. Last inserted ID is: " . $last_id;
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

//insert multiple records
$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', '[email protected]');";
$sql .= "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('Mary', 'Moe', '[email protected]');";
$sql .= "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('Julie', 'Dooley', '[email protected]')";

if ($conn->multi_query($sql) === true) {
    echo "New records created successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

//select data or showing records
$sql = "SELECT id, firstname, lastname FROM MyGuests";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // output data of each row
    while ($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["firstname"].
         " " . $row["lastname"]. "<br>";
    }
} else {
    echo "0 results";
}

//update data
$sql = "UPDATE MyGuests SET lastname='Doe' WHERE id=2";

if ($conn->query($sql) === true) {
    echo "Record updated successfully";
} else {
    echo "Error updating record: " . $conn->error;
}

// sql to delete a record
$sql = "DELETE FROM MyGuests WHERE id=3";

if ($conn->query($sql) === true) {
    echo "Record deleted successfully";
} else {
    echo "Error deleting record: " . $conn->error;
}

$conn->close();
?>