API support for scrollable cursors

implement SQLSTATE style error codes.
Allow drivers to add methods to dbh and stmt objects
(note that we can't use a class, because the use only sees the PDO class).
Clarify the api sligh

implement SQLSTATE style error codes.
Allow drivers to add methods to dbh and stmt objects
(note that we can't use a class, because the use only sees the PDO class).
Clarify the api slightly:
PDO::exec() is used for one-shot queries that don't return rows
PDO::query() is a convenience function for returning a rowset without
having to go through the steps of preparing and executing.

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Synopsis:

PDOStatement::setFetchMode()
reset default fetch() mode for a statement to PDO_FETCH_BOTH

PDOStatement::setFetchMode(PDO_FETCH_NUM)
PDOStatement::setFetchM

Synopsis:

PDOStatement::setFetchMode()
reset default fetch() mode for a statement to PDO_FETCH_BOTH

PDOStatement::setFetchMode(PDO_FETCH_NUM)
PDOStatement::setFetchMode(PDO_FETCH_ASSOC)
PDOStatement::setFetchMode(PDO_FETCH_BOTH)
PDOStatement::setFetchMode(PDO_FETCH_OBJ)
set default fetch() mode for a statement.

PDOStatement::setFetchMode(PDO_FETCH_COLUMN, int colno)
set default fetch() mode to retrieve colno-th column on each fetch() call.

PDOStatement::setFetchMode(PDO_FETCH_CLASS, string classname [, array ctor args])
set default fetch() mode to create an instance of classname,
calling it's ctor, passing the optional ctor args.
The names of the columns in the result set will be used as property names on
the object instance. PPP rules apply.

[NOTE: calling ctor is not yet implemented]
[TODO: this might crash PHP for persistent PDO handles]

PDOStatement::setFetchMode(PDO_FETCH_INTO, object obj)
Similar to PDO_FETCH_CLASS, except that each iteration will update the
supplied object properties.

[TODO: this might crash PHP for persistent PDO handles]

The default fetch() mode is used when no parameters are passed to
PDOStatement::fetch(). When using a statement in an iterator context,
PDOStatement::fetch() is called implicitly on each iteration.

object PDO::queryAndIterate(string sql, <PDOStatement::setFetchMode args>)
This is semantically equivalent to:

$stmt = $pdo->prepare($sql);
$stmt->execute();
$stmt->setFetchMode($args);
return $stmt;


Example/Intended usage:

/* fetch an array with numeric and string keys */
foreach ($pdo->queryAndIterate("select NAME, VALUE from test") as $row) {
debug_zval_dump($row);
}

/* fetch the value of column 1 into $row on each iteration */
foreach ($pdo->queryAndIterate("select NAME, VALUE from test",
PDO_FETCH_COLUMN, 1) as $row) {
debug_zval_dump($row); // string(3) "foo"
}

/* create a new instance of class Foo on each iteration */
foreach ($pdo->queryAndIterate("select NAME, VALUE from test",
PDO_FETCH_CLASS, 'Foo') as $row) {
debug_zval_dump($row);
/*
Object(Foo)#4 (2) refcount(2){
["NAME"]=>
string(12) "foo220051429" refcount(2)
["VALUE"]=>
string(12) "bar789825748" refcount(2)
}
*/
}

etc.

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- Fix warning

Implement persistent connections
$dbh->exec --> $dbh->query

Implement empty-string-to-null conversion option for oracle compat.
This can be enabled using:
$dbh->setAttribute(PDO_ATTR_ORACLE_NULLS, true);

Added missing constant and correct bound column retrieval. When bound
columns are specified only return status (TRUE/FALSE) indicator.

Revert (at Wez's request)

Added double param type

Some definitions for cursors.
Define a mechanism for driver-specific attributes.
Use a refcount for the stmt structure.

Bump the version number

Update package/module

Version 1 of PDO_FETCH_LAZY

Implement case folding of column names as a portability option.

Enable setting the different error modes via PDO::setAttribute()

Added missing user-land constants.

First cut at a "unified" error handling API. The main thing that is missing
currently is a switch in the dbh to indicate what to do with the errors.

Timeout stuff.

exec() now returns row count

Skip spaces between connection params.

Give user a nice message when PDO isn't initialized prior to a driver.

Hello PDO.

Still more to come. Give it a couple of days before starting to write drivers
for the other databases; a few things might change, so I'd like to coordinate
that, but in a

Hello PDO.

Still more to come. Give it a couple of days before starting to write drivers
for the other databases; a few things might change, so I'd like to coordinate
that, but in a couple of days.

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