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PHP - Complete PDO CRUD

rockyouman

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In this tutorial we will create a Complete PDO CRUD using PDO. This code has several functionalities that can manipulate a data through database server using PDO query. The code use a PDO query to (Create, Read, Update, Delete) a certain data to a database server with a high data protection in order to avoid data injection tools.

We will be using PDO as a query scripting it an acronym for PHP Data Objects. It is a lean, clean, and consistent way to access databases. This means developers can write portable code much easier.

Getting started:

First you have to download & install XAMPP or any local server that run PHP scripts. Here's the link for XAMPP server https://www.apachefriends.org/index.html.

And, this is the link for the bootstrap that i used for the layout design https://getbootstrap.com/.

Creating Database

Open your database web server then create a database name in it db_pdo_crud, after that click Import then locate the database file inside the folder of the application then click ok.
2019-09-22_00_33_59-localhost_127.0.0.1_db_pdo_crud_phpmyadmin_4.8.3.png

Creating the database connection

Open your any kind of text editor(notepadd++, etc..). Then just copy/paste the code below then name it conn.php.
  1. <?php
  2. $db_username

    =

    'root'

    ;
  3. $db_password

    =

    ''

    ;
  4. $conn

    =

    new

    PDO(

    'mysql:host=localhost;dbname=db_pdo_crud'

    ,

    $db_username

    ,

    $db_password

    )

    ;
  5. if

    (

    !

    $conn

    )

    {
  6. die

    (

    "Fatal Error: Connection Failed!"

    )

    ;
  7. }
  8. ?>

Creating The Interface

This is where we will create a simple form for our application. To create the forms simply copy and write it into you text editor, then save it as index.php.
  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4. <link rel="stylesheet" type="text/css" href="css/bootstrap.css">
  5. <meta charset="UTF-8" name="viewport" content="width=device-width, initial-scale=1"/>
  6. </head>
  7. <body>
  8. <nav class="navbar navbar-default">
  9. <div class="container-fluid">
  10. <a href="https://sourcecodester.com" class="navbar-brand">Sourcecodester</a>
  11. </div>
  12. </nav>
  13. <div class="col-md-3"></div>
  14. <div class="col-md-6 well">
  15. <h3 class="text-primary">PHP - Complete PDO CRUD</h3>
  16. <hr style="border-top:1px dotted #ccc;" />
  17. <div class="col-md-3">
  18. <form method="POST" action="add.php">
  19. <div class="form-group">
  20. <label>Firstname</label>
  21. <input class="form-control" type="text" name="firstname"/>
  22. </div>
  23. <div class="form-group">
  24. <label>Lastname</label>
  25. <input class="form-control" type="text" name="lastname"/>
  26. </div>
  27. <div class="form-group">
  28. <label>Address</label>
  29. <input class="form-control" type="text" name="address"/>
  30. </div>
  31. <div class="form-group">
  32. <button class="btn btn-primary form-control" type="submit" name="save">Save</button>
  33. </div>
  34. </form>
  35. </div>
  36. <div class="col-md-9">
  37. <table class="table table-bordered">
  38. <thead class="alert-info">
  39. <tr>
  40. <th>Firstname</th>
  41. <th>Lastname</th>
  42. <th>Address</th>
  43. <th>Action</th>
  44. </tr>
  45. </thead>
  46. <tbody>
  47. <?php
  48. require

    'conn.php'

    ;
  49. $sql

    =

    $conn

    ->

    prepare

    (

    "SELECT * FROM `user`"

    )

    ;
  50. $sql

    ->

    execute

    (

    )

    ;
  51. while

    (

    $fetch

    =

    $sql

    ->

    fetch

    (

    )

    )

    {
  52. ?>
  53. <tr>
  54. <td><?php

    echo

    $fetch

    [

    'firstname'

    ]

    ?>

    </td>
  55. <td><?php

    echo

    $fetch

    [

    'lastname'

    ]

    ?>

    </td>
  56. <td><?php

    echo

    $fetch

    [

    'address'

    ]

    ?>

    </td>
  57. <td><button class="btn btn-warning btn-sm" data-toggle="modal" data-target="#update<?php

    echo

    $fetch

    [

    'user_id'

    ]

    ?>

    ">Edit</button> | <a class="btn btn-danger btn-sm" href="delete.php?id=<?php

    echo

    $fetch

    [

    'user_id'

    ]

    ?>

    ">Delete</a></td>
  58. </tr>

  60. <div class="modal fade" id="update<?php

    echo

    $fetch

    [

    'user_id'

    ]

    ?>

    " aria-hidden="true">
  61. <div class="modal-dialog">
  62. <div class="modal-content">
  63. <form method="POST" action="update.php">
  64. <div class="modal-header">
  65. <h3 class="modal-title">Update User</h3>
  66. </div>
  67. <div class="modal-body">
  68. <div class="col-md-2"></div>
  69. <div class="col-md-8">
  70. <div class="form-group">
  71. <label>Firstname</label>
  72. <input class="form-control" type="text" value="<?php

    echo

    $fetch

    [

    'firstname'

    ]

    ?>

    " name="firstname"/>
  73. <input type="hidden" value="<?php

    echo

    $fetch

    [

    'user_id'

    ]

    ?>

    " name="user_id"/>
  74. </div>
  75. <div class="form-group">
  76. <label>Lastname</label>
  77. <input class="form-control" type="text" value="<?php

    echo

    $fetch

    [

    'lastname'

    ]

    ?>

    " name="lastname"/>
  78. </div>
  79. <div class="form-group">
  80. <label>Address</label>
  81. <input class="form-control" type="text" value="<?php

    echo

    $fetch

    [

    'address'

    ]

    ?>

    " name="address"/>
  82. </div>
  83. <div class="form-group">
  84. <button class="btn btn-warning form-control" type="submit" name="update">Update</button>
  85. </div>
  86. </div>
  87. </div>
  88. <br style="clear:both;"/>
  89. <div class="modal-footer">
  90. <button class="btn btn-danger" data-dismiss="modal">Close</button>
  91. </div>
  92. </form>
  93. </div>
  94. </div>
  95. </div>

  97. <?php
  98. }
  99. ?>
  100. </tbody>
  101. </table>
  102. </div>
  103. </div>
  104. <script src="js/jquery-3.2.1.min.js"></script>
  105. <script src="js/bootstrap.js"></script>
  106. </body>
  107. </html>

Creating the Main Function

This code contains the main function of the application. This code can manipulate a data when the button is clicked. To do that write these block of codes inside the text editor and save it as shown below.
add.php
  1. <?php
  2. require_once

    'conn.php'

    ;

  4. if

    (

    ISSET

    (

    $_POST

    [

    'save'

    ]

    )

    )

    {
  5. try{
  6. $firstname

    =

    $_POST

    [

    'firstname'

    ]

    ;
  7. $lastname

    =

    $_POST

    [

    'lastname'

    ]

    ;
  8. $address

    =

    $_POST

    [

    'address'

    ]

    ;
  9. $conn

    ->

    setAttribute

    (

    PDO::

    ATTR_ERRMODE

    ,

    PDO::

    ERRMODE_EXCEPTION

    )

    ;
  10. $sql

    =

    "INSERT INTO `user` (`firstname`, `lastname`, `address`) VALUES ('$firstname

    ', '$lastname

    ', '$address

    ')"

    ;
  11. $conn

    ->

    exec

    (

    $sql

    )

    ;
  12. }

    catch(

    PDOException $e

    )

    {
  13. echo

    $e

    ->

    getMessage

    (

    )

    ;
  14. }

  16. $conn

    =

    null

    ;
  17. header

    (

    'location:index.php'

    )

    ;
  18. }
  19. ?>

update.php
  1. <?php
  2. require_once

    'conn.php'

    ;

  4. if

    (

    ISSET

    (

    $_POST

    [

    'update'

    ]

    )

    )

    {
  5. try{
  6. $user_id

    =

    $_POST

    [

    'user_id'

    ]

    ;
  7. $firstname

    =

    $_POST

    [

    'firstname'

    ]

    ;
  8. $lastname

    =

    $_POST

    [

    'lastname'

    ]

    ;
  9. $address

    =

    $_POST

    [

    'address'

    ]

    ;
  10. $conn

    ->

    setAttribute

    (

    PDO::

    ATTR_ERRMODE

    ,

    PDO::

    ERRMODE_EXCEPTION

    )

    ;
  11. $sql

    =

    "UPDATE `user`SET `firstname` = '$firstname

    ', `lastname` = '$lastname

    ', `address` = '$address

    ' WHERE `user_id` = '$user_id

    '"

    ;
  12. $conn

    ->

    exec

    (

    $sql

    )

    ;
  13. }

    catch(

    PDOException $e

    )

    {
  14. echo

    $e

    ->

    getMessage

    (

    )

    ;
  15. }

  17. $conn

    =

    null

    ;
  18. header

    (

    'location:index.php'

    )

    ;
  19. }
  20. ?>

delete.php
  1. <?php
  2. if

    (

    ISSET

    (

    $_GET

    [

    'id'

    ]

    )

    )

    {
  3. require_once

    'conn.php'

    ;
  4. $id

    =

    $_GET

    [

    'id'

    ]

    ;
  5. $sql

    =

    $conn

    ->

    prepare

    (

    "DELETE from `user` WHERE `user_id`='$id

    '"

    )

    ;
  6. $sql

    ->

    execute

    (

    )

    ;
  7. header

    (

    'location:index.php'

    )

    ;
  8. }
  9. ?>

There you have it we successfully created a Complete PDO CRUD using PDO. I hope that this simple tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!!!


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