transaction support added

lib/sbdb/environment.rb

@@ -47,7 +47,7 @@ module SBDB
 		end 
 
 		def transaction flags = nil, &e
-			Transaction.new flags, &e
+			Transaction.new self, flags, &e
 		end
 		alias txn transaction
 
@@ -62,8 +62,7 @@ module SBDB
 			opts = {:dir => args[0], :flags => args[1], :mode => args[2]}.update opts
 			@dbs, @env = WeakHash.new, Bdb::Env.new( 0)
 			@env.log_config opts[:log_config], 1  if opts[:log_config]
-			p lg_bsize: @env.lg_bsize
-			@env.lg_bsize = 5*2**20  if opts[:lg_bsize]
+			@env.lg_bsize = opts[:lg_bsize]  if opts[:lg_bsize]
 			begin @env.open opts[:dir]||'.', opts[:flags]|| INIT_TRANSACTION|CREATE, opts[:mode]||0
 			rescue Object
 				close

lib/sbdb/transaction.rb

@@ -0,0 +1,42 @@
+require 'sbdb'
+require 'bdb'
+
+module SBDB
+	class Transaction
+		NOSYNC = Bdb::DB_TXN_NOSYNC
+		SYNC = Bdb::DB_TXN_SYNC
+		NOWAIT = Bdb::DB_TXN_NOWAIT
+		WRITE_NOSYNC = Bdb::DB_TXN_WRITE_NOSYNC
+		SNAPSHOT = Bdb::DB_TXN_SNAPSHOT
+		READ_COMMITED = Bdb::DB_READ_COMMITTED
+		READ_UNCOMMITED = Bdb::DB_READ_UNCOMMITTED
+
+		def bdb_object()  @txn  end
+
+		def self.new *p, &e
+			r = obj = super( *p)
+			begin
+				r = e.call obj
+			rescue Object
+				obj.abort
+				raise $!
+			ensure
+				obj.commit
+			end  if e
+			r
+		end
+
+		def initialize env, flags = nil, parent = nil
+			@txn = env.bdb_object.txn_begin parent, flags || 0
+		end
+
+		def commit flags = nil
+			@txn.commit flags || 0
+		end
+
+		def abort
+			@txn.abort
+		end
+	end
+	TXN = Transaction
+end