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freenetis-github/system/libraries/drivers/Database/Pgsql.php @ c478920d

8baed187 Michal Kliment
<?php defined('SYSPATH') OR die('No direct access allowed.');
/**
* PostgreSQL 8.1+ Database Driver
*
* $Id: Pgsql.php 4344 2009-05-11 16:41:39Z zombor $
*
* @package Core
* @author Kohana Team
* @copyright (c) 2007-2008 Kohana Team
* @license http://kohanaphp.com/license.html
*/
class Database_Pgsql_Driver extends Database_Driver {

// Database connection link
protected $link;
protected $db_config;

/**
* Sets the config for the class.
*
* @param array database configuration
*/
public function __construct($config)
{
$this->db_config = $config;

Log::add('debug', 'PgSQL Database Driver Initialized');
}

public function connect()
{
// Check if link already exists
if (is_resource($this->link))
return $this->link;

// Import the connect variables
extract($this->db_config['connection']);

// Persistent connections enabled?
$connect = ($this->db_config['persistent'] == TRUE) ? 'pg_pconnect' : 'pg_connect';

// Build the connection info
$port = isset($port) ? 'port=\''.$port.'\'' : '';
$host = isset($host) ? 'host=\''.$host.'\' '.$port : ''; // if no host, connect with the socket

$connection_string = $host.' dbname=\''.$database.'\' user=\''.$user.'\' password=\''.$pass.'\'';
// Make the connection and select the database
if ($this->link = $connect($connection_string))
{
if ($charset = $this->db_config['character_set'])
{
echo $this->set_charset($charset);
}

// Clear password after successful connect
$this->db_config['connection']['pass'] = NULL;

return $this->link;
}

return FALSE;
}

public function query($sql)
{
// Only cache if it's turned on, and only cache if it's not a write statement
if ($this->db_config['cache'] AND ! preg_match('#\b(?:INSERT|UPDATE|SET)\b#i', $sql))
{
$hash = $this->query_hash($sql);

if ( ! isset($this->query_cache[$hash]))
{
// Set the cached object
$this->query_cache[$hash] = new Pgsql_Result(pg_query($this->link, $sql), $this->link, $this->db_config['object'], $sql);
}
else
{
// Rewind cached result
$this->query_cache[$hash]->rewind();
}

return $this->query_cache[$hash];
}

// Suppress warning triggered when a database error occurs (e.g., a constraint violation)
return new Pgsql_Result(@pg_query($this->link, $sql), $this->link, $this->db_config['object'], $sql);
}

public function set_charset($charset)
{
$this->query('SET client_encoding TO '.pg_escape_string($this->link, $charset));
}

public function escape_table($table)
{
if (!$this->db_config['escape'])
return $table;

return '"'.str_replace('.', '"."', $table).'"';
}

public function escape_column($column)
{
if (!$this->db_config['escape'])
return $column;

if ($column == '*')
return $column;

// This matches any functions we support to SELECT.
if ( preg_match('/(avg|count|sum|max|min)\(\s*(.*)\s*\)(\s*as\s*(.+)?)?/i', $column, $matches))
{
if ( count($matches) == 3)
{
return $matches[1].'('.$this->escape_column($matches[2]).')';
}
else if ( count($matches) == 5)
{
return $matches[1].'('.$this->escape_column($matches[2]).') AS '.$this->escape_column($matches[2]);
}
}

// This matches any modifiers we support to SELECT.
if ( ! preg_match('/\b(?:all|distinct)\s/i', $column))
{
if (stripos($column, ' AS ') !== FALSE)
{
// Force 'AS' to uppercase
$column = str_ireplace(' AS ', ' AS ', $column);

// Runs escape_column on both sides of an AS statement
$column = array_map(array($this, __FUNCTION__), explode(' AS ', $column));

// Re-create the AS statement
return implode(' AS ', $column);
}

return preg_replace('/[^.*]+/', '"$0"', $column);
}

$parts = explode(' ', $column);
$column = '';

for ($i = 0, $c = count($parts); $i < $c; $i++)
{
// The column is always last
if ($i == ($c - 1))
{
$column .= preg_replace('/[^.*]+/', '"$0"', $parts[$i]);
}
else // otherwise, it's a modifier
{
$column .= $parts[$i].' ';
}
}
return $column;
}

public function regex($field, $match, $type, $num_regexs)
{
$prefix = ($num_regexs == 0) ? '' : $type;

return $prefix.' '.$this->escape_column($field).' ~* \''.$this->escape_str($match).'\'';
}

public function notregex($field, $match, $type, $num_regexs)
{
$prefix = $num_regexs == 0 ? '' : $type;

return $prefix.' '.$this->escape_column($field).' !~* \''.$this->escape_str($match) . '\'';
}

public function limit($limit, $offset = 0)
{
return 'LIMIT '.$limit.' OFFSET '.$offset;
}

public function compile_select($database)
{
$sql = ($database['distinct'] == TRUE) ? 'SELECT DISTINCT ' : 'SELECT ';
$sql .= (count($database['select']) > 0) ? implode(', ', $database['select']) : '*';

if (count($database['from']) > 0)
{
$sql .= "\nFROM ";
$sql .= implode(', ', $database['from']);
}

if (count($database['join']) > 0)
{
foreach($database['join'] AS $join)
{
$sql .= "\n".$join['type'].'JOIN '.implode(', ', $join['tables']).' ON '.$join['conditions'];
}
}

if (count($database['where']) > 0)
{
$sql .= "\nWHERE ";
}

$sql .= implode("\n", $database['where']);

if (count($database['groupby']) > 0)
{
$sql .= "\nGROUP BY ";
$sql .= implode(', ', $database['groupby']);
}

if (count($database['having']) > 0)
{
$sql .= "\nHAVING ";
$sql .= implode("\n", $database['having']);
}

if (count($database['orderby']) > 0)
{
$sql .= "\nORDER BY ";
$sql .= implode(', ', $database['orderby']);
}

if (is_numeric($database['limit']))
{
$sql .= "\n";
$sql .= $this->limit($database['limit'], $database['offset']);
}

return $sql;
}

public function escape_str($str)
{
if (!$this->db_config['escape'])
return $str;

is_resource($this->link) or $this->connect();

return pg_escape_string($this->link, $str);
}

public function list_tables()
{
$sql = 'SELECT table_schema || \'.\' || table_name FROM information_schema.tables WHERE table_schema NOT IN (\'pg_catalog\', \'information_schema\')';
$result = $this->query($sql)->result(FALSE, PGSQL_ASSOC);

$retval = array();
foreach ($result as $row)
{
$retval[] = current($row);
}

return $retval;
}

public function show_error()
{
return pg_last_error($this->link);
}

public function list_fields($table)
{
$result = NULL;

foreach ($this->field_data($table) as $row)
{
// Make an associative array
$result[$row->column_name] = $this->sql_type($row->data_type);

if (!strncmp($row->column_default, 'nextval(', 8))
{
$result[$row->column_name]['sequenced'] = TRUE;
}

if ($row->is_nullable === 'YES')
{
$result[$row->column_name]['null'] = TRUE;
}
}

if (!isset($result))
throw new Kohana_Database_Exception('database.table_not_found', $table);

return $result;
}

public function field_data($table)
{
// http://www.postgresql.org/docs/8.3/static/infoschema-columns.html
$result = $this->query('
SELECT column_name, column_default, is_nullable, data_type, udt_name,
character_maximum_length, numeric_precision, numeric_precision_radix, numeric_scale
FROM information_schema.columns
WHERE table_name = \''. $this->escape_str($table) .'\'
ORDER BY ordinal_position
');

return $result->result_array(TRUE);
}

} // End Database_Pgsql_Driver Class

/**
* PostgreSQL Result
*/
class Pgsql_Result extends Database_Result {

// Data fetching types
protected $fetch_type = 'pgsql_fetch_object';
protected $return_type = PGSQL_ASSOC;

/**
* Sets up the result variables.
*
* @param resource query result
* @param resource database link
* @param boolean return objects or arrays
* @param string SQL query that was run
*/
public function __construct($result, $link, $object = TRUE, $sql)
{
$this->link = $link;
$this->result = $result;

// If the query is a resource, it was a SELECT, SHOW, DESCRIBE, EXPLAIN query
if (is_resource($result))
{
// Its an DELETE, INSERT, REPLACE, or UPDATE query
if (preg_match('/^(?:delete|insert|replace|update)\b/iD', trim($sql), $matches))
{
$this->insert_id = (strtolower($matches[0]) == 'insert') ? $this->insert_id() : FALSE;
$this->total_rows = pg_affected_rows($this->result);
}
else
{
$this->current_row = 0;
$this->total_rows = pg_num_rows($this->result);
$this->fetch_type = ($object === TRUE) ? 'pg_fetch_object' : 'pg_fetch_array';
}
}
else
{
throw new Kohana_Database_Exception('database.error', pg_last_error().' - '.$sql);
}

// Set result type
$this->result($object);

// Store the SQL
$this->sql = $sql;
}

/**
* Magic __destruct function, frees the result.
*/
public function __destruct()
{
if (is_resource($this->result))
{
pg_free_result($this->result);
}
}

public function result($object = TRUE, $type = PGSQL_ASSOC)
{
$this->fetch_type = ((bool) $object) ? 'pg_fetch_object' : 'pg_fetch_array';

// This check has to be outside the previous statement, because we do not
// know the state of fetch_type when $object = NULL
// NOTE - The class set by $type must be defined before fetching the result,
// autoloading is disabled to save a lot of stupid overhead.
if ($this->fetch_type == 'pg_fetch_object')
{
$this->return_type = (is_string($type) AND Kohana::auto_load($type)) ? $type : 'stdClass';
}
else
{
$this->return_type = $type;
}

return $this;
}

public function as_array($object = NULL, $type = PGSQL_ASSOC)
{
return $this->result_array($object, $type);
}

public function result_array($object = NULL, $type = PGSQL_ASSOC)
{
$rows = array();

if (is_string($object))
{
$fetch = $object;
}
elseif (is_bool($object))
{
if ($object === TRUE)
{
$fetch = 'pg_fetch_object';

// NOTE - The class set by $type must be defined before fetching the result,
// autoloading is disabled to save a lot of stupid overhead.
$type = (is_string($type) AND Kohana::auto_load($type)) ? $type : 'stdClass';
}
else
{
$fetch = 'pg_fetch_array';
}
}
else
{
// Use the default config values
$fetch = $this->fetch_type;

if ($fetch == 'pg_fetch_object')
{
$type = (is_string($type) AND Kohana::auto_load($type)) ? $type : 'stdClass';
}
}

if ($this->total_rows)
{
pg_result_seek($this->result, 0);

while ($row = $fetch($this->result, NULL, $type))
{
$rows[] = $row;
}
}

return $rows;
}

public function insert_id()
{
if ($this->insert_id === NULL)
{
$query = 'SELECT LASTVAL() AS insert_id';

// Disable error reporting for this, just to silence errors on
// tables that have no serial column.
$ER = error_reporting(0);

$result = pg_query($this->link, $query);
$insert_id = pg_fetch_array($result, NULL, PGSQL_ASSOC);

$this->insert_id = $insert_id['insert_id'];

// Reset error reporting
error_reporting($ER);
}

return $this->insert_id;
}

public function seek($offset)
{
if ($this->offsetExists($offset) AND pg_result_seek($this->result, $offset))
{
// Set the current row to the offset
$this->current_row = $offset;

return TRUE;
}

return FALSE;
}

public function list_fields()
{
$field_names = array();

$fields = pg_num_fields($this->result);
for ($i = 0; $i < $fields; ++$i)
{
$field_names[] = pg_field_name($this->result, $i);
}

return $field_names;
}

/**
* ArrayAccess: offsetGet
*/
public function offsetGet($offset)
{
if ( ! $this->seek($offset))
return FALSE;

// Return the row by calling the defined fetching callback
$fetch = $this->fetch_type;
return $fetch($this->result, NULL, $this->return_type);
}

} // End Pgsql_Result Class

/**
* PostgreSQL Prepared Statement (experimental)
*/
class Kohana_Pgsql_Statement {

protected $link = NULL;
protected $stmt;

public function __construct($sql, $link)
{
$this->link = $link;

$this->stmt = $this->link->prepare($sql);

return $this;
}

public function __destruct()
{
$this->stmt->close();
}

// Sets the bind parameters
public function bind_params()
{
$argv = func_get_args();
return $this;
}

// sets the statement values to the bound parameters
public function set_vals()
{
return $this;
}

// Runs the statement
public function execute()
{
return $this;
}
}