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Natively Connect to Quandl Data in PHP

The CData ODBC driver for Quandl enables you to create PHP applications with connectivity to Quandl data. Leverage the native support for ODBC in PHP.

Drop the CData ODBC Driver for Quandl into your LAMP or WAMP stack to build Quandl-connected Web applications. This article shows how to use PHP's ODBC built-in functions to connect to Quandl data, execute queries, and output the results.

Configure a DSN

If you have not already, first specify connection properties in an ODBC DSN (data source name). This is the last step of the driver installation. You can use the Microsoft ODBC Data Source Administrator to create and configure ODBC DSNs.

Quandl uses an API key for authentication. See the help documentation for a guide to obtaining the APIKey property.

Additionally, set the DatabaseCode connection property to the code identifying the Database whose Datasets you want to query with SQL. You can search the available Databases by querying the Databases view.

Establish a Connection

Open the connection to Quandl by calling the odbc_connect or odbc_pconnect methods. To close connections, use odbc_close or odbc_close_all.

$conn = odbc_connect("CData ODBC Quandl Source","user","password");

Connections opened with odbc_connect are closed when the script ends. Connections opened with the odbc_pconnect method are still open after the script ends. This enables other scripts to share that connection when they connect with the same credentials. By sharing connections among your scripts, you can save system resources, and queries execute faster.

$conn = odbc_pconnect("CData ODBC Quandl Source","user","password"); ... odbc_close($conn); //persistent connection must be closed explicitly

Create Prepared Statements

Create prepared statements and parameterized queries with the odbc_prepare function.

$query = odbc_prepare($conn, "SELECT * FROM AAPL WHERE Collapse = ?");

Execute Queries

Execute prepared statements with odbc_execute.

$conn = odbc_connect("CData ODBC Quandl Source","user","password"); $query = odbc_prepare($conn, "SELECT * FROM AAPL WHERE Collapse = ?"); $success = odbc_execute($query, array('Daily'));

Execute nonparameterized queries with odbc_exec.

$conn = odbc_connect("CData ODBC Quandl Source","user","password"); $query = odbc_exec($conn, "SELECT Date, Volume FROM AAPL");

Process Results

Access a row in the result set as an array with the odbc_fetch_array function.

$conn = odbc_connect("CData ODBC Quandl data Source","user","password"); $query = odbc_exec($conn, "SELECT Date, Volume FROM AAPL"); while($row = odbc_fetch_array($query)){ echo $row["Date"] . "\n"; }

Display the result set in an HTML table with the odbc_result_all function.

$conn = odbc_connect("CData ODBC Quandl data Source","user","password"); $query = odbc_prepare($conn, "SELECT * FROM AAPL WHERE Collapse = ?"); $success = odbc_execute($query, array('Daily')); if($success) odbc_result_all($query);

More Example Queries

You will find complete information on the driver's supported SQL in the help documentation. The code examples above are Quandl-specific adaptations of the PHP community documentation for all ODBC functions.