Access Avro Data in PHP through Connect Cloud

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CData Connect



Connect to Avro through the standard MySQL libraries in PHP.

You can use CData Connect Cloud to access Avro data from MySQL clients, without needing to perform an ETL or cache data. Follow the steps below to create a virtual MySQL database for Avro and connect to Avro data in real time through PHP's standard MySQL interfaces, mysqli and PDO_MySQL.

CData Connect Cloud provides a pure MySQL, cloud-to-cloud interface for Avro, allowing you to easily query live Avro data in PHP — without replicating the data to a natively supported database. As you query data in PHP, CData Connect Cloud pushes all supported SQL operations (filters, JOINs, etc) directly to Avro, leveraging server-side processing to quickly return Avro data.

Create a Virtual MySQL Database for Avro Data

CData Connect Cloud uses a straightforward, point-and-click interface to connect to data sources and generate APIs.

  1. Login to Connect Cloud and click Databases.
  2. Select "Avro" from Available Data Sources.
  3. Enter the necessary authentication properties to connect to Avro. Connect to your local Avro file(s) by setting the URI connection property to the location of the Avro file.
  4. Click Test Database.
  5. Click Privileges -> Add and add the new user (or an existing user) with the appropriate permissions.

With the virtual database created, you are ready to connect to Avro data from any MySQL client.

Connect in PHP

The following examples show how to use object-oriented interfaces to connect and execute queries. Initialize the connection object with the following parameters to connect to the virtual MySQL database:

  • Host: Specify the remote host location where the service is running. In this case "myinstance.cdatacloud.net" is used for the remote host setting since the service is running on the local machine.
  • Username: Specify the username for a user you authorized in Connect Cloud.
  • Password: Specify the password for the authorized user account.
  • Database Name: Specify the name of the virtual database you created for Avro.
  • Port: Specify the port the service is running on, port 3306 in this example.

mysqli

<?php
$mysqli = mysqli_init();

$mysqli->ssl_set("C:/certs/cloudclient.key",
                 "C:/certs/cloudclient.pem",
                 "C:/certs/myCA.pem",
                 NULL,NULL);

$mysqli->real_connect("mysintance.cdatacloud.net", "admin", "mypassword", "avrodb",3306,NULL,MYSQLI_CLIENT_SSL_DONT_VERIFY_SERVER_CERT);
?>

PDO

<?php
$pdo = new PDO('mysql:host=myinstance.cdatacloud.net;dbname=avrodb;port=3306;','admin', 'mypassword', array(
    PDO::MYSQL_ATTR_SSL_KEY                => 'C:/certs/cloudclient.key',
    PDO::MYSQL_ATTR_SSL_CERT               => 'C:/certs/cloudclient.pem',
    PDO::MYSQL_ATTR_SSL_CA                 => 'C:/certs/myCA.pem',
    PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT => false
    )
);
?>

Query in PHP

With the connection established, you can then access tables. The following steps walk through the example:

  1. Query the table; for example, SampleTable_1. The results will be stored as an associative array in the $result object.
  2. Iterate over each row and column, printing the values to display in the PHP page.
  3. Close the connection.

mysqli

$result = $mysqli->query("SELECT Id, Column1 FROM SampleTable_1 WHERE Column2 = 'value_2'");
while($row = $result->fetch_assoc()) {
  foreach ($row as $k=>$v) {
    echo "$k : $v";
    echo "<br />"; 
  }
}
$mysqli->close();

PDO

$result = $pdo->query("SELECT Id, Column1 FROM SampleTable_1 WHERE Column2 = 'value_2'");
while($row = $result->fetch(PDO::FETCH_ASSOC)) {
  foreach ($row as $k=>$v) {
    echo "$k : $v";
    echo "<br />"; 
  }
}
$result = null;
$pdo = null;