--- /dev/null
+<?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 = $config;
+
+ Kohana::log('debug', 'PgSQL Database Driver Initialized');
+ }
+
+ public function connect()
+ {
+ // Check if link already exists
+ if (is_resource($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;
+ }
+}
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