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|
"=====================================================================
|
| PosgreSQL DBI driver - Connection class and related classes
|
|
======================================================================"
"======================================================================
|
| Written by Mike Anderson gnu-smalltalk@gingerbread.plus.com 2006
| Based on PostgreSQL interface by Thomas Braun shin@shin.homelinux.net
|
| This file is part of the GNU Smalltalk class library.
|
| The GNU Smalltalk class library is free software; you can redistribute it
| and/or modify it under the terms of the GNU Lesser General Public License
| as published by the Free Software Foundation; either version 2.1, or (at
| your option) any later version.
|
| The GNU Smalltalk class library is distributed in the hope that it will be
| useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
| General Public License for more details.
|
| You should have received a copy of the GNU Lesser General Public License
| along with the GNU Smalltalk class library; see the file COPYING.LIB.
| If not, write to the Free Software Foundation, 59 Temple Place - Suite
| 330, Boston, MA 02110-1301, USA.
|
======================================================================
"
Connection subclass: PGConnection [
| handle |
<comment: nil>
<category: 'DBI-Drivers'>
PGConnection class >> driverName [
<category: 'initialization'>
^'PostgreSQL'
]
PGConnection class >> fieldConverterClass [
<category: 'initialization'>
^PGFieldConverter
]
ConnectionStatus := #(#CONNECTION_OK
#CONNECTION_BAD
#CONNECTION_STARTED
#CONNECTION_MADE
#CONNECTION_AWAITING_RESPONSE
#CONNECTION_AUTH_OK
#CONNECTION_SETENV
#CONNECTION_SSL_STARTUP
#CONNECTION_NEEDED).
PGConnection class >> connectionStatus: aCode [
<category: 'constants'>
^ConnectionStatus at: aCode + 1
]
PGConnection class >> unrecognizedParameters [
<category: 'private'>
"These are the synonymous parameters which our superclass adds and
PQconnectdb does not understand"
^#('db' 'database' 'hostname').
]
PGConnection class >> paramConnect: aParams user: aUserName password: aPassword [
"Normally you would use Connection>>connect:user:password: with a DSN
specifying the appropriate driver string.
Note that aUserName and aPassword may be nil; for Postgres, the username
defaults to the OS user if not supplied."
<category: 'instance creation'>
"Assemble a connection string in the right format"
| connStr connParams handle conn connOK |
connParams := OrderedCollection new.
aParams keysAndValuesDo: [:k :v |
(self unrecognizedParameters includes: k)
ifFalse: [connParams add: k , '=' , v]].
aUserName notNil ifTrue: [connParams add: 'user=' , aUserName].
aPassword notNil ifTrue: [connParams add: 'password=' , aPassword].
connStr := connParams inject: '' into: [ :a :b | a, ' ', b ].
handle := PQConnection connect: connStr.
connOK := self connectionStatus: handle status.
connOK == #CONNECTION_OK
ifFalse:
[handle finish.
self error: 'Connection failed (' , connOK , ')'].
^(self new)
handle: handle;
yourself
]
handle: aCObject [
<category: 'private'>
handle := aCObject.
self addToBeFinalized
]
finalize [
<category: 'private'>
self close
]
do: aSQLQuery [
<category: 'implementations'>
^(PGResultSet new: (handle exec: aSQLQuery))
checkStatusForDo;
yourself
]
prepare: aSQLQuery [
"FIXME"
<category: 'implementations'>
self notYetImplemented
]
select: aSQLQuery [
<category: 'implementations'>
^(PGResultSet new: (handle exec: aSQLQuery))
checkStatusForSelect;
yourself
]
close [
<category: 'implementations'>
handle finish
]
beginTransaction [
<category: 'implementations'>
^self do: 'BEGIN'
]
commitTransaction [
<category: 'implementations'>
^self do: 'COMMIT'
]
rollbackTransaction [
<category: 'implementations'>
^self do: 'ROLLBACK'
]
database [
<category: 'accessing'>
^handle database
]
primTableAt: aString ifAbsent: aBlock [
| table |
table := PGTable name: aString connection: self.
table columnsArray isEmpty ifTrue: [ ^aBlock value ].
^table
]
]
CObject subclass: PQConnection [
"Connections"
PQConnection class >> connect: aString [
<cCall: 'PQconnectdb' returning: #{PQConnection} args: #(#string)>
]
status [
<cCall: 'PQstatus' returning: #int args: #(#self)>
]
database [
<cCall: 'PQdb' returning: #string args: #(#self)>
]
errorMessage [
<cCall: 'PQerrorMessage' returning: #string args: #(#self)>
]
finish [
<cCall: 'PQfinish' returning: #void args: #(#self)>
]
"Executing SQL"
exec: aSqlStatement [
<cCall: 'PQexec' returning: #{PQResultSet} args: #(#self #string)>
]
]
|
