Posts Tagged ‘Strings’

Oracle : Oracle Database Connection Strings in PHP

December 29th, 2012, posted in Oracle
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It’s easy to get confused as to how to specificy your Oracle database connection string, and there’s a handy new feature in Oracle 10g that makes this a whole lot easier. So here’s a little rundown of the three ways to connect to Oracle databases. You can use the:
  • tnsnames.ora file
  • Full connection string
  • Easy connect string
These examples show how to specificy an Oracle connection string using the new OCI8 functions in PHP.


tnsnames.ora File

The tnsnames.ora file is a client side
file that maps an alias used by client programs to a database service. It is used to connect to a non-default database. Here you have to have an entry in the tnsnames.ora file, and
reference the alias to that entry in your connection code.
PHP code:
oci_connect($un, $pw, ‘MYDB’);
tnsnames.ora entry
MYDB = (DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)
(HOST = mymachine.mydomain)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = MYDB.AU.ORACLE.COM)) )


Full Connection String

The full connection string does not require the use of a tnsnames.ora file.
You need to enter the full connection string when you connect to the database in your code.
PHP code:
oci_connect($un, $pw,
‘(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=mymachine.mydomain)(PORT=1521))
(CONNECT_DATA=(SERVER=DEDICATED)
(SERVICE_NAME = MYDB)))’);


Easy Connect String

This is one Oracle 10g feature that I use daily. As I constantly connect to so many different databases in my day, this has saved me so much time as I don’t have to configure anything, just know the machine name and the database alias and I’m off.
The easy connect string does not require the use of a tnsnames.ora file, and is an abbreviated version of the full connection string. you must have the Oracle 10g client-side libraries to use the easy connect string.
PHP code:
oci_connect($un, $pw, ‘//mymachine.mydomain:port/MYDB’);
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