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Natively Connect to Greenplum Data in PHP

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

Drop the CData ODBC Driver for Greenplum into your LAMP or WAMP stack to build Greenplum-connected Web applications. This article shows how to use PHP's ODBC built-in functions to connect to Greenplum 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.

To connect to Greenplum, set the Server, Port (the default port is 5432), and Database connection properties and set the User and Password you wish to use to authenticate to the server. If the Database property is not specified, the default database for the authenticate user is used.

Establish a Connection

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

$conn = odbc_connect("CData ODBC Greenplum 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.

$conn = odbc_pconnect("CData ODBC Greenplum Source","user","password"); ... odbc_close($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 Orders WHERE ShipCountry = ?");

Execute Queries

Execute prepared statements with odbc_execute.

$conn = odbc_connect("CData ODBC Greenplum Source","user","password"); $query = odbc_prepare($conn, "SELECT * FROM Orders WHERE ShipCountry = ?"); $success = odbc_execute($query, array('USA'));

Execute nonparameterized queries with odbc_exec.

$conn = odbc_connect("CData ODBC Greenplum Source","user","password"); $query = odbc_exec($conn, "SELECT Freight, ShipName FROM Orders WHERE ShipCountry = USA");

Process Results

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

$conn = odbc_connect("CData ODBC Greenplum data Source","user","password"); $query = odbc_exec($conn, "SELECT Freight, ShipName FROM Orders WHERE ShipCountry = USA"); while($row = odbc_fetch_array($query)){ echo $row["Freight"] . "\n"; }

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

$conn = odbc_connect("CData ODBC Greenplum data Source","user","password"); $query = odbc_prepare($conn, "SELECT * FROM Orders WHERE ShipCountry = ?"); $success = odbc_execute($query, array('USA')); 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 Greenplum-specific adaptations of the PHP community documentation for all ODBC functions.