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UNIX for Dummies Questions & Answers
path of init.ora
Post 76679 by sssow on Wednesday 29th of June 2005 09:09:43 PM
06-29-2005
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LEARN ABOUT PHP
dba_open
DBA_OPEN(3) 1 DBA_OPEN(3) dba_open - Open database SYNOPSIS
resource dba_open (string $path, string $mode, [string $handler], [mixed $...]) DESCRIPTION
dba_open(3) establishes a database instance for $path with $mode using $handler. PARAMETERS
o $path - Commonly a regular path in your filesystem. o $mode - It is r for read access, w for read/write access to an already existing database, c for read/write access and database creation if it doesn't currently exist, and n for create, truncate and read/write access. The database is created in BTree mode, other modes (like Hash or Queue) are not supported. Additionally you can set the database lock method with the next char. Use l to lock the database with a .lck file or d to lock the databasefile itself. It is important that all of your applications do this consis- tently. If you want to test the access and do not want to wait for the lock you can add t as third character. When you are abso- lutely sure that you do not require database locking you can do so by using - instead of l or d. When none of d, l or - is used, dba will lock on the database file as it would with d. Note There can only be one writer for one database file. When you use dba on a web server and more than one request requires write operations they can only be done one after another. Also read during write is not allowed. The dba extension uses locks to prevent this. See the following table: DBA locking +-------------+---------------+---+---+---+---+---+---+---+ |already open | | | | | | | | | | | | | | | | | | | | | $mode = "rl" | | | | | | | | | | | | | | | | | | | | $mode = "rlt" | | | | | | | | | | | | | | | | | | | | $mode = "wl" | | | | | | | | | | | | | | | | | | | | $mode = "wlt" | | | | | | | | | | | | | | | | | | | | $mode = "rd" | | | | | | | | | | | | | | | | | | | | $mode = "rdt" | | | | | | | | | | | | | | | | | | | | $mode = "wd" | | | | | | | | | | | | | | | | | | | | $mode = "wdt" | | | | | | | | | | | | | | | | | | +-------------+---------------+---+---+---+---+---+---+---+ | not open | | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | |$mode = "rl" | | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | wait | | | | | | | | | | | | | | | | | | | | false | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | |$mode = "wl" | | | | | | | | | | | | | | | | | | | | | wait | | | | | | | | | | | | | | | | | | | | false | | | | | | | | | | | | | | | | | | | | wait | | | | | | | | | | | | | | | | | | | | false | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | |$mode = "rd" | | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | ok | | | | | | | | | | | | | | | | | | | | wait | | | | | | | | | | | | | | | | | | | | false | | | | | | | | | | | | | | | | | | |$mode = "wd" | | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | illegal | | | | | | | | | | | | | | | | | | | | wait | | | | | | | | | | | | | | | | | | | | false | | | | | | | | | | | | | | | | | | | | wait | | | | | | | | | | | | | | | | | | | | false | | | | | | | | | | | | | | | | | | +-------------+---------------+---+---+---+---+---+---+---+ ook: the second call will be successfull. owait: the second call waits until dba_close(3) is called for the first. ofalse: the second call returns false. oillegal: you must not mix "l" and "d" modifiers for $mode parameter. o $handler - The name of the handler which shall be used for accessing $path. It is passed all optional parameters given to dba_open(3) and can act on behalf of them. RETURN VALUES
Returns a positive handle on success or FALSE on failure. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 4.3.0 | | | | | | | It's possible to open database files over net- | | | work connection. However in cases a socket con- | | | nection will be used (as with http or ftp) the | | | connection will be locked instead of the resource | | | itself. This is important to know since in such | | | cases locking is simply ignored on the resource | | | and other solutions have to be found. | | | | +--------+---------------------------------------------------+ SEE ALSO
dba_popen(3), dba_close(3). PHP Documentation Group DBA_OPEN(3)