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Creating a Database Connection
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The hr_db.inc file contains a db_connect() function that calls the OCI8 oci_connect() library function for creating a database connection. The db_connect() function provides two parameters:
$un for the username, with default value ORA_CON_UN
$pw for the password, with default value ORA_CON_PW
The db_connect() function returns a database connection identifier, or false on error. The db_connect() function uses ORA_CON_DB for connecting to the target database instance. Note: After each page request, a database connection opened with the oci_connect() call is implicitly closed. If you want, you can explicitly close the database connection by calling the oci_close() function.