AJAX Database ExampleAJAX can be used for interactive communication with a database. Show
AJAX Database ExampleThe following example will demonstrate how a web page can fetch information from a database with AJAX: Example Explained - The showCustomer() FunctionWhen a user selects a customer in the dropdown list above, a function called showCustomer function showCustomer(str) { The
The AJAX Server PageThe page on the server called by the JavaScript above is a PHP file called "getcustomer.php". The source code in "getcustomer.php" runs a query against a database, and returns the result in an HTML table: <?php $sql = "SELECT customerid, companyname, contactname, address, city, postalcode, country $stmt = $mysqli->prepare($sql); echo "<table>"; Select and Order Data From a MySQL DatabaseThe ORDER BY clause is used to sort the result-set in ascending or descending order. The ORDER BY clause sorts the records in ascending order by default. To sort the records in descending order, use the DESC keyword. SELECT column_name(s) FROM table_name ORDER BY column_name(s) ASC|DESC To learn more about SQL, please visit our SQL tutorial. Select and Order Data With MySQLiThe following example selects the id, firstname and lastname columns from the MyGuests table. The records will be ordered by the lastname column: Example (MySQLi Object-oriented)<?php // Create connection $sql = "SELECT id, firstname, lastname FROM MyGuests ORDER BY lastname"; if ($result->num_rows > 0) { Run example » Code lines to explain from the example above: First, we set up the SQL query that selects the id, firstname and lastname columns from the MyGuests table. The records will be ordered by the lastname column. The next line of code runs the query and puts the resulting data into a variable called $result. Then, the If there are more than zero rows returned, the function The following example shows the same as the example above, in the MySQLi procedural way: Example (MySQLi Procedural)<?php // Create connection $sql = "SELECT id, firstname, lastname FROM MyGuests ORDER BY lastname"; if (mysqli_num_rows($result) > 0) { mysqli_close($conn); Run example » You can also put the result in an HTML table: Example (MySQLi Object-oriented)<?php // Create connection $sql = "SELECT id, firstname, lastname FROM MyGuests ORDER BY lastname"; if ($result->num_rows > 0) { Run example » Select Data With PDO (+ Prepared Statements)The following example uses prepared statements. Here we select the id, firstname and lastname columns from the MyGuests table. The records will be ordered by the lastname column, and it will be displayed in an HTML table: Example (PDO)<?php class TableRows extends RecursiveIteratorIterator { function current() { function beginChildren() { function endChildren() { $servername = "localhost"; try { // set the resulting array to associative Run example » How can fetch data from database in PHP?There are two ways to connect to a database using PHP.. MySQLi Object-Oriented $conn->query($query);. MySQLi Procedural mysqli_query($conn, $query). PDO. $stmt = $conn->prepare($query); $stmt->execute();. How fetch data from database in PHP and display in table?Use the following steps for fetch/retrieve data from database in php and display in html table:. Step 1 – Start Apache Web Server.. Step 2 – Create PHP Project.. Step 3 – Execute SQL query to Create Table.. Step 4 – Create phpmyadmin MySQL Database Connection File.. Step 5 – Create Fetch Data PHP File From Database.. How do you retrieve data from a database?Fetch data from a database. Start by creating a new app.. Add a Screen to your app. ... . Add data sources to your app by referencing some Entities in the Manage Dependencies window (Ctrl+Q). ... . Publish the app by clicking the 1-Click Publish button. ... . It's time to load some data to the Screen.. How can I fetch all data from a table in PHP?The fetch_all() / mysqli_fetch_all() function fetches all result rows and returns the result-set as an associative array, a numeric array, or both.
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