Difference between revisions of "PHP112"
From mi-linux
Jump to navigationJump to search| Line 69: | Line 69: | ||
= Deconstruction of the example = | = Deconstruction of the example = | ||
| − | |||
| − | |||
== pets-form.html == | == pets-form.html == | ||
| Line 91: | Line 89: | ||
== pets-search.php == | == pets-search.php == | ||
| + | A lot of the code above is similar to the previous section, so let's focus on what's new: | ||
| + | |||
| + | <pre> | ||
| + | // Build custom SQL query | ||
| + | $sql = "SELECT name, species, age FROM pet"; | ||
| + | |||
| + | // Add search criteria, if provided | ||
| + | if($_POST['searchName'] != "") | ||
| + | $sql.= " WHERE name LIKE '%" . $_POST['searchName'] . "%'"; | ||
| + | </pre> | ||
| + | |||
| + | <pre> | ||
| + | // How many rows were returned? | ||
| + | $num_pets = mysqli_num_rows($res); | ||
| + | |||
| + | if($num_pets == 0) | ||
| + | print("<p>No pet with that name, sorry...</p>"); | ||
| + | else { | ||
| + | print("<p>We found $num_pets pet(s) matching thay name...</p>"); | ||
| + | </pre> | ||
| + | |||
| + | Everything else is pretty much the same as before. | ||
= Ready to move on? = | = Ready to move on? = | ||
Let's tackle this week's [[PHPEX05|mini-task]]! | Let's tackle this week's [[PHPEX05|mini-task]]! | ||
Revision as of 16:16, 29 June 2016
Main Page >> Web Application Development >> Workbook >> Simple HTML/PHP/MySQL example
A Simple HTML/PHP/MySQL Example
The following example will:
- use a form to gather criteria for a search
- pass the criteria to a PHP script
- build a custom query
- execute the query against a database, returning results
- output the results
1. A form to gather criteria (pets-form.html)
<html>
<head>
<title>Part 1 - Form</title>
</head>
<body>
<form action="pets-search.php" method="post">
<p>
Enter pet's name: <INPUT type="text" name="searchName">
</p>
<p>
<INPUT type="submit" value="Search">
</p>
</form>
</body>
</html>
2. The PHP script (pets-search.php)
<?php
// Connect to server/database
$mysqli = mysqli_connect("localhost", "bdtuser", "bdtuser", "bdtheque");
if (mysqli_connect_errno($mysqli)) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// Build custom SQL query
$sql = "SELECT name, species, age FROM pet";
// Add search criteria, if provided
if($_POST['searchName'] != "")
$sql.= " WHERE name LIKE '%" . $_POST['searchName'] . "%'";
// Run SQL query
$res = mysqli_query($mysqli, $sql);
// How many rows were returned?
$num_pets = mysqli_num_rows($res);
if($num_pets == 0)
print("<p>No pet with that name, sorry...</p>");
else {
print("<p>We found $num_pets pet(s) matching thay name...</p>");
// Loop through resultset and display each field's value
while($row = mysqli_fetch_assoc($res)) {
echo $row['name']. " - ". $row['species'] ."<br>";
}
}
?>
Deconstruction of the example
pets-form.html
This line in very important:
<form action="pets-search.php" method="post">
It specifies that anything entered in the current form should be posted to a file called pets-search.php. Obviously the latter should match the name of YOUR file.
On this line of code:
Enter pet's name: <INPUT type="text" name="searchName">
It is important to note the name of the text field ("searchName"), as we will need it in the script below.
pets-search.php
A lot of the code above is similar to the previous section, so let's focus on what's new:
// Build custom SQL query $sql = "SELECT name, species, age FROM pet"; // Add search criteria, if provided if($_POST['searchName'] != "") $sql.= " WHERE name LIKE '%" . $_POST['searchName'] . "%'";
// How many rows were returned?
$num_pets = mysqli_num_rows($res);
if($num_pets == 0)
print("<p>No pet with that name, sorry...</p>");
else {
print("<p>We found $num_pets pet(s) matching thay name...</p>");
Everything else is pretty much the same as before.
Ready to move on?
Let's tackle this week's mini-task!
