Gecko [ beriskala.com ]

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Rename

U:RDoc::NormalClass[iI"DBM:ET@I"Object;Fo:RDoc::Markup::Document:@parts[o;;[o:RDoc::Markup::Paragraph;[I")Documented by mathew meta@pobox.com.;TS:RDoc::Markup::Heading:
leveli:	textI"Introduction;To:RDoc::Markup::BlankLine�o;	;[I"5The DBM class provides a wrapper to a Unix-style;TI"I{dbm}[http://en.wikipedia.org/wiki/Dbm] or Database Manager library.;T@o;	;[I"KDbm databases do not have tables or columns; they are simple key-value;TI"Ndata stores, like a Ruby Hash except not resident in RAM. Keys and values;TI"must be strings.;T@o;	;[I"MThe exact library used depends on how Ruby was compiled. It could be any;TI"of the following:;T@o:RDoc::Markup::List:
@type:BULLET:@items[
o:RDoc::Markup::ListItem:@label0;[o;	;[I"5The original ndbm library is released in 4.3BSD.;TI"JIt is based on dbm library in Unix Version 7 but has different API to;TI"-support multiple databases in a process.;To;;0;[o;	;[I"E{Berkeley DB}[http://en.wikipedia.org/wiki/Berkeley_DB] versions;TI"F1 thru 5, also known as BDB and Sleepycat DB, now owned by Oracle;TI"Corporation.;To;;0;[o;	;[I"9Berkeley DB 1.x, still found in FreeBSD and OpenBSD.;To;;0;[o;	;[I"N{gdbm}[http://www.gnu.org/software/gdbm/], the GNU implementation of dbm.;To;;0;[o;	;[I"D{qdbm}[http://fallabs.com/qdbm/index.html], another open source;TI"reimplementation of dbm.;T@o;	;[I"DAll of these dbm implementations have their own Ruby interfaces;TI"8available, which provide richer (but varying) APIs.;T@S;
;i;I"
Cautions;T@o;	;[I"MBefore you decide to use DBM, there are some issues you should consider:;T@o;;;;[	o;;0;[o;	;[I"GEach implementation of dbm has its own file format. Generally, dbm;TI"Elibraries will not read each other's files. This makes dbm files;TI"$a bad choice for data exchange.;T@o;;0;[o;	;[I"KEven running the same OS and the same dbm implementation, the database;TI"Kfile format may depend on the CPU architecture. For example, files may;TI"Mnot be portable between PowerPC and 386, or between 32 and 64 bit Linux.;T@o;;0;[o;	;[I"NDifferent versions of Berkeley DB use different file formats. A change to;TI"=the OS may therefore break DBM access to existing files.;T@o;;0;[o;	;[
I"LData size limits vary between implementations. Original Berkeley DB was;TI"Ilimited to 2GB of data. Dbm libraries also sometimes limit the total;TI"Ksize of a key/value pair, and the total size of all the keys that hash;TI"Nto the same value. These limits can be as little as 512 bytes. That said,;TI"Ggdbm and recent versions of Berkeley DB do away with these limits.;T@o;	;[I"PGiven the above cautions, DBM is not a good choice for long term storage of;TI"Limportant data. It is probably best used as a fast and easy alternative;TI"4to a Hash for processing large amounts of data.;T@S;
;i;I"Example;T@o:RDoc::Markup::Verbatim;[I"require 'dbm'
;FI".db = DBM.open('rfcs', 666, DBM::CREATRW)
;FI"Jdb['822'] = 'Standard for the Format of ARPA Internet Text Messages'
;FI"Ndb['1123'] = 'Requirements for Internet Hosts - Application and Support'
;FI"=db['3068'] = 'An Anycast Prefix for 6to4 Relay Routers'
;FI"puts db['822'];F:
@fileI"ext/dbm/dbm.c;T;0[�[
[I"READER;To;;[o;	;[I"LIndicates that dbm_open() should open the database in read-only mode   ;T;0@w[I"WRITER;To;;[o;	;[I"MIndicates that dbm_open() should open the database in read/write mode   ;T;0@w[I"WRCREAT;To;;[o;	;[I"KIndicates that dbm_open() should open the database in read/write mode,;TI"/and create it if it does not already exist;T;0@w[I"
NEWDB;To;;[o;	;[I"KIndicates that dbm_open() should open the database in read/write mode,;TI"Jcreate it if it does not already exist, and delete all contents if it;TI"does already exist.;T;0@w[I"VERSION;To;;[o;	;[I"<The version of the dbm library, if using Berkeley DB   ;T;0@w[[I"Enumerable;Fo;;[�;0@w[[I"
class;F[[:public[[I"new;F@w[I"	open;T@w[:protected[�[:private[�[I"
instance;F[[;[([I"[];T@w[I"[]=;T@w[I"
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include?;T@w[I"invert;T@w[I"key;T@w[I"	key?;T@w[I"	keys;T@w[I"length;T@w[I"member?;T@w[I"reject;T@w[I"reject!;T@w[I"replace;T@w[I"select;T@w[I"
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