joomla/joomla-platform — pull request #917 by gpongelli (2012-02-23 22:11:30+00:00)
Title: PostgreSQL driver for Joomla! platform [clean version].

This driver implements inherited function from JDatabaseDriver class and add some other useful function to be able to use Joomla! on PostgreSQL database.
There is also a class that inherits from JDatabaseQuery to be able to create query object using PostgreSQL dialect.
These two classes are tested by other two classes under "test" folder.

PostgreSQL's added functions:
- getAlterDbCharacterSet, set database encoding
- getCreateDbQuery, returns a query string to create a database using $option array members
- getRandom, get a random number
- getStringPositionSQL, returns string's position inside another string
- getTableSequences, returns an array of table's sequences information
- releaseTransactionSavepoint, release given savepoint during transaction
- showTables, lists all table in database
- transactionSavepoint, creates transaction savepoint

Overridden functions:
- connected
- dropTable
- escape
- execute
- fetchArray
- fetchAssoc
- fetchObject
- freeResult
- getAffectedRows
- getCollation
- getNumRows
- getQuery
- getTableColumns
- getTableCreate
- getTableKeys
- getTableList
- getVersion
- insertid
- insertObject
- lockTable
- renameTable
- replacePrefix
- select
- setUTF
- transactionCommit
- transactionRollback
- transactionStart
- unlockTables
- updateObject

PostgreSQL database query added functions:
- limit, a possible replace for limit in setQuery
- offset, a possible replace for limit in setQuery
- forShare, lock table/row during SELECT
- forUpdate, lock table/row during SELECT
- getInsertTable, used in "indertid()" to retrieve last INSERT INTO's table name
- noWait, no wait a locked table
- returning, an INSERT INTO optional clause to returns last insert id

Added also Postgresql's exporter and importer classes and their test classes.