Develop PHP Applications with MySQL X DevAPI

Copyright © 2017, Oracle and/or its affiliates. All rights reserved. |
Session Title: Develop PHP Applications with MySQL X DevAPI
• Conference: Oracle Code One
• Session Type: Developer Session
• Session ID: DEV5981
• Presenter: David Stokes
Confidential – Oracle Internal/Restricted/Highly Restricted

Develop PHP Applications
With The MySQL X DevAPI
Dave Stokes
MySQL Community Manager
Oracle Corporation
October 24, 2018
David.Stokes@Oracle.com
@Stoker

Safe Harbor Statement
The preceding is intended to outline our general product direction. It is intended for
information purposes only, and may not be incorporated into any contract. It is not a
commitment to deliver any material, code, or functionality, and should not be relied upon
in making purchasing decisions. The development, release, and timing of any features or
functionality described for Oracle’s products remains at the sole discretion of Oracle.

Who Am I
Dave Stokes
MySQL Community Manager
@Stoker
David.Stokes @ Oracle.com
Slideshare.net/davidmstokes
My new book ->
Confidential – Oracle Internal/Restricted/Highly Restricted 4

So What Is DEV5981 All About?
Agenda

Agenda
1. X Devapi
– What is it?
– MySQL Without the SQL
– MySQL Document Store
2. Installation of PECL Extension
– Where to get mysql_xdevapi and other needed software
– Build the PECL Extension
3. Coding
– Examples, Examples, and a few more Examples

No Code Changes Needed for Cluster Operations
The code that is needed to connect to a MySQL document store looks a lot like
the traditional MySQL connection code, but now applications can establish logical
sessions to MySQL server instances running the X Plugin.
Sessions are produced by the mysqlx factory, and the returned Sessions can
encapsulate access to one or more MySQL server instances running X Plugin.
Applications that use Session objects by default can be deployed on both single
server setups and database clusters with no code changes.
7

Session Creation
Create a Session using the mysqlx.getSession(connection) method. You
pass in the connection parameters to connect to the MySQL server, such as the
hostname, user and so on, very much like the code in one of the classic APIs.
The connection parameters can be specified as either a URI type string, for
example user:@localhost:33060, or as a data dictionary, for example
{user: myuser, password: mypassword, host: example.com,
port: 33060}
8

Protocol
9

X DevAPI
Part I

X Devapi -> What is it?
User Guide :
https://dev.mysql.com/doc/x-devapi-userguide/en/

X Devapi
The X DevAPI wraps powerful concepts in a simple API.
● A new high-level session concept enables you to write code
that can transparently scale from single MySQL Server to a
multiple server environment.
● Read operations are simple and easy to understand.
● Non-blocking, asynchronous calls follow common host
language patterns.

The X DevAPI introduces a new, modern
and easy-to-learn way to work with your data.
● Documents are stored in Collections and have their
dedicated CRUD operation set.
● Work with your existing domain objects or generate code
based on structure definitions for strictly typed languages.
● Focus is put on working with data via CRUD operations.
● Modern practices and syntax styles are used to get away
from traditional SQL-String-Building.

Simple Summation
You no longer have to embed ugly
strings of Structured Query
Language (SQL) code in your
beautiful PHP Code.
14

The X DevAPI and Create Read,
Update, and Delete (CRUD) operations.
CRUD operations are available as methods, which operate on Schema objects.
The available Schema objects consist of
Collection objects, containing Documents,
or
Table objects consisting of rows and Collections containing Documents.

The following table shows the available CRUD operations for both Collection and
Table objects.
16
Operation Document Relational
Create Collection.add() Table.insert()
Read Collection.find() Table.select()
Update Collection.modify() Table.update()
Delete Collection.remove() Table.delete()

Database Object - Class Diagram
17

Method Chaining
The X DevAPI supports a number of modern practices
to make working with CRUD operations easier and to
fit naturally into modern development environments.
This section explains how to use method chaining
instead of working with SQL strings of JSON
structures.
18

Synchronous versus Asynchronous Execution
Traditionally, many MySQL drivers used a synchronous approach
when executing SQL statements. This meant that operations such
as opening connections and executing queries were blocked until
completion, which could take a long time. To allow for parallel
execution, a developer had to write a multithreaded application.
Any MySQL client that supports the X Protocol can provide
asynchronous execution, either using callbacks, Promises,
or by explicitly waiting on a specific result at the moment in time
when it is actually needed.
19

Working with Collections
Working with collections of documents is straight forward when
using the X DevAPI. The following examples show the basic
usage of CRUD operations when working with documents.
20

MySQL X DevAPI PECL Extension
Agenda

An example installation procedure on Ubuntu 18.04 with PHP 7.2:
// Dependencies
$ apt install build-essential libprotobuf-dev libboost-dev openssl protobuf-compiler
// PHP with the desired extensions; php7.2-dev is required to compile
$ apt install php7.2-cli php7.2-dev php7.2-mysql php7.2-pdo php7.2-xml
// Compile the extension
$ pecl install mysql_xdevapi
26

The pecl install command does not enable PHP extensions (by default) and enabling
PHP extensions can be done in several ways. Another PHP 7.2 on Ubuntu 18.04
example:
// Create its own ini file
$ echo "extension=mysql_xdevapi.so" > /etc/php/7.2/mods-
available/mysql_xdevapi.ini
// Use the 'phpenmod' command (note: it's Debian/Ubuntu specific)
$ phpenmod -v 7.2 -s ALL mysql_xdevapi
// A 'phpenmod' alternative is to manually symlink it
// $ ln -s /etc/php/7.2/mods-available/mysql_xdevapi.ini
/etc/php/7.2/cli/conf.d/20-mysql_xdevapi.ini
27

Check to make sure MySQL Modules loaded
php -m | grep mysql
mysql_xdevapi
mysqli
mysqlnd
PDO_mysql
28

RPM users
The only way currently is to load all the needed software and build PHP from
scratch.
And yes, that is going to be corrected.
29

Examples in PHP
So what does the code look like?!?!

X DevAPI -- Lots of similarities to mysqli and PDO
1. Connect to server
a. Username, Password, Port, schema, encodings, etc.
2. Send Query
3. Get Results
4. Disconnect
31

QUICK Review of PHP/MySQL APIs
So you have three choices now...
32

Mysqli - replaces old, deprecated mysql interface
<?php
$mysqli = new mysqli("example.com", "user", "password", "database");
if ($mysqli->connect_errno) {
echo "Failed to connect to MySQL: (" . $mysqli->connect_errno . ") " .
$mysqli->connect_error;
}
if (!$mysqli->query("DROP TABLE IF EXISTS test") ||
!$mysqli->query("CREATE TABLE test(id INT)") ||
!$mysqli->query("INSERT INTO test(id) VALUES (1)")) {
echo "Table creation failed: (" . $mysqli->errno . ") " . $mysqli->error;
}
?>

PDO
<?php
if ($db->getAttribute(PDO::ATTR_DRIVER_NAME) == 'mysql') {
$stmt = $db->prepare('select * from foo',
array(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => true));
} else {
die("my application only works with mysql;
I should use $stmt->fetchAll() instead");
}
?>

X Devapi Connection
<?php
$session =
mysql_xdevapigetSession("mysqlx://user:password@host");
if ($session === NULL) {
die("Connection could not be established");
}
// ... use $session
?>
35

So Lets Walk Through a X DevAPI Example
:-)
36

Create a schema and a collection
$schema = $session->createSchema("test");
$collection = $schema->createCollection("example");
37

Create Some Data
$marco = [
"name" => "Marco",
"age" => 19,
"job" => "Programmer"
];
$mike = [
"name" => "Mike",
"age" => 39,
"job" => "Manager"
];
38

Store Data
$schema = $session->getSchema("test");
$collection = $schema->getCollection("example");
$collection->add($marco, $mike)->execute();
var_dump($collection->find("name ='Mike'")->execute()->fetchOne());
39

Fetch Data
$result = $collection->find()->execute());
foreach ($result as $doc) {
echo "${doc["name"]} is a ${doc["job"]}.n";
}
40

Yet More Examples!
Subtitle

Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | Confidential – Oracle Internal/Restricted/Highly Restricted 42
#!/usr/bin/php
<?PHP
// Connection parameters
$user = 'root';
$passwd = 'S3cret#';
$host = 'localhost';
$port = '33060';
$connection_uri = 'mysqlx://'.$user.':'.$passwd.'@'.$host.':'.$port;
echo $connection_uri . "n";
// Connect as a Node Session
$nodeSession = mysql_xdevapigetNodeSession($connection_uri);
// "USE world_x" schema
$schema = $nodeSession->getSchema("world_x");
// Specify collection to use
$collection = $schema->getCollection("countryinfo");
// SELECT * FROM world_x WHERE _id = "USA"
$result = $collection->find('_id = "USA"')->execute();
// Fetch/Display data
$data = $result->fetchAll();
var_dump($data);
?>

#!/usr/bin/php
<?PHP
$user = 'root';
$port = '33060';
var_dump($data);
?>

<?php
$uri = "mysqlx://root:XXX@localhost:33060/?ssl-mode=disabled";
$nodeSession = mysql_xdevapigetSession( $uri );
$schema = $nodeSession->createSchema( "testx" );
$coll = $schema->createCollection( "store" );
$result = $coll->add( '{ "product" : "iPhone X", "price":1000,
"stock" : 2 }' )->execute();
print 'The generated ID for the document is: ' . $result-
>getDocumentId() . PHP_EOL;
?>

$uri = "mysqlx://root:XXX@localhost:33060?ssl-mode=disabled";
$nodeSession = mysql_xdevapigetSession( $uri );
$schema = $nodeSession->createSchema( "testx" );
$coll = $schema->createCollection( "store" );
$result = $coll->add( '{ "product" : "iPhone X", "price":1000, "stock" : 2 }'
'{ "product" : "Nokia Y", "price":900, "stock" : 3,
"description": "A good mobile phone" }' )->execute();
$item_count = $result->getAffectedItemsCount();
print($item_count." documents has been added to the collection, printing ID's");
$ids = $result->getGeneratedIds();
for( $i = 0 ; $i < $item_count ; $i++ ) {
print("The document ID number ".$i." is ".$ids[$i].PHP_EOL);
}

//Add some documents, note that I'm providing the IDs myself
$res = $coll->add(
["_id" => "1", "name" => "Carlotta", "age" => 34, "job" => "Dentista"],
["_id" => "2", "name" => "Antonello", "age" => 45, "job" => "Tassinaro"],
["_id" => "3", "name" => "Mariangela", "age" => 32, "job" => "Attrice"],
["_id" => "4", "name" => "Antonio", "age" => 42, "job" => "Urologo"]
)->execute();
//Remove the document with ID 4
$coll->removeOne("4");
//Find all the entries for which the 'age' field is greater than 30
$res = $coll->find("age > 30")->execute();
//Fetch the entries
$data = $res->fetchAll();
//Print the results
for( $i = 0 ; $i < count( $data ) ; $i++ ) {
print($data[$i]["name"]." have more than 30 years!");
}

//Fill the collection with some documents
$coll->add('{"name": "Sakila", "age": 15, "job": "Programmer"}',
'{"name": "Sakila", "age": 17, "job": "Singer"}',
'{"name": "Sakila", "age": 18, "job": "Student"}',
'{"name": "Arnold", "age": 24, "job": "Plumber"}',
'{"name": "Robert", "age": 39, "job": "Manager"}')->execute();
//This modify operation will change the 'job' to 'Unemployed' for all
//the three Sakila in the collection
$coll->modify("name like 'Sakila'")->set("job", "Unemployed")->execute();
//Add a second job to Arnold, the field 'job' will now on be an array
//of two elements: 'Plumber' and 'Nursey'
$coll->modify("name like 'Arnold'")->arrayAppend('job','Nursey')->execute();

What About Relational Tables??
Yet More Examples!
50

<?php
$session = mysql_xdevapigetSession("mysqlx://root:secret@localhost");
$session->sql("DROP DATABASE IF EXISTS addressbook")->execute();
$session->sql("CREATE DATABASE addressbook")->execute();
$session->sql("CREATE TABLE addressbook.names(name text, age int)")-
>execute();
$session->sql("INSERT INTO addressbook.names values ('John', 42), ('Sam',
33)")->execute();
$schema = $session->getSchema("addressbook");
$table = $schema->getTable("names");
$row = $table->select('name', 'age')->execute()->fetchAll();
print_r($row);

#!/bin/php
<?php
$session = mysql_xdevapigetSession("mysqlx://root:hidave@localhost:33060");
if ($session === NULL) {
die("Connection could not be established");
}
$schema = $session->getSchema("world");
$table = $schema->getTable("city");
$row = $table->select('Name','District')
->where('District like :district')
->bind(['district' => 'Texas'])
->execute()->fetchAll();
print_r($row);

Q/A
?

Slides posted to https://slideshare.net/davidmstokes
@stoker or David.Stokes @ Oracle.com

Develop PHP Applications with MySQL X DevAPI

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