<?php
/*
 @version   v5.20.13  06-Aug-2018
 @copyright (c) 2000-2013 John Lim (jlim#natsoft.com). All rights reserved.
 @copyright (c) 2014      Damien Regad, Mark Newnham and the ADOdb community
  Released under both BSD license and Lesser GPL library license.
  Whenever there is any discrepancy between the two licenses,
  the BSD license will take precedence.
  Set tabs to 4.

  Postgres7 support.
  28 Feb 2001: Currently indicate that we support LIMIT
  01 Dec 2001: dannym added support for default values
*/

// security - hide paths
if (!defined('ADODB_DIR')) die();

include_once(ADODB_DIR."/drivers/adodb-postgres64.inc.php");

class ADODB_postgres7 extends ADODB_postgres64 {
	var $databaseType = 'postgres7';
	var $hasLimit = true;	// set to true for pgsql 6.5+ only. support pgsql/mysql SELECT * FROM TABLE LIMIT 10
	var $ansiOuter = true;
	var $charSet = true; //set to true for Postgres 7 and above - PG client supports encodings

	// Richard 3/18/2012 - Modified SQL to return SERIAL type correctly AS old driver no longer return SERIAL as data type.
	var $metaColumnsSQL = "
		SELECT
			a.attname,
			CASE
				WHEN x.sequence_name != ''
				THEN 'SERIAL'
				ELSE t.typname
			END AS typname,
			a.attlen, a.atttypmod, a.attnotnull, a.atthasdef, a.attnum
		FROM
			pg_class c,
			pg_attribute a
		JOIN pg_type t ON a.atttypid = t.oid
		LEFT JOIN (
			SELECT
				c.relname as sequence_name,
				c1.relname as related_table,
				a.attname as related_column
			FROM pg_class c
			JOIN pg_depend d ON d.objid = c.oid
			LEFT JOIN pg_class c1 ON d.refobjid = c1.oid
			LEFT JOIN pg_attribute a ON (d.refobjid, d.refobjsubid) = (a.attrelid, a.attnum)
			WHERE c.relkind = 'S' AND c1.relname = '%s'
		) x ON x.related_column= a.attname
		WHERE
			c.relkind in ('r','v')
			AND (c.relname='%s' or c.relname = lower('%s'))
			AND a.attname not like '....%%'
			AND a.attnum > 0
			AND a.attrelid = c.oid
		ORDER BY
			a.attnum";

	// used when schema defined
	var $metaColumnsSQL1 = "
		SELECT
			a.attname,
			CASE
				WHEN x.sequence_name != ''
				THEN 'SERIAL'
				ELSE t.typname
			END AS typname,
			a.attlen, a.atttypmod, a.attnotnull, a.atthasdef, a.attnum
		FROM
			pg_class c,
			pg_namespace n,
			pg_attribute a
		JOIN pg_type t ON a.atttypid = t.oid
		LEFT JOIN (
			SELECT
				c.relname as sequence_name,
				c1.relname as related_table,
				a.attname as related_column
			FROM pg_class c
			JOIN pg_depend d ON d.objid = c.oid
			LEFT JOIN pg_class c1 ON d.refobjid = c1.oid
			LEFT JOIN pg_attribute a ON (d.refobjid, d.refobjsubid) = (a.attrelid, a.attnum)
			WHERE c.relkind = 'S' AND c1.relname = '%s'
		) x ON x.related_column= a.attname
		WHERE
			c.relkind in ('r','v')
			AND (c.relname='%s' or c.relname = lower('%s'))
			AND c.relnamespace=n.oid and n.nspname='%s'
			AND a.attname not like '....%%'
			AND a.attnum > 0
			AND a.atttypid = t.oid
			AND a.attrelid = c.oid
		ORDER BY a.attnum";


	function __construct()
	{
		parent::__construct();
		if (ADODB_ASSOC_CASE !== ADODB_ASSOC_CASE_NATIVE) {
			$this->rsPrefix .= 'assoc_';
		}
		$this->_bindInputArray = PHP_VERSION >= 5.1;
	}


	// the following should be compat with postgresql 7.2,
	// which makes obsolete the LIMIT limit,offset syntax
	function SelectLimit($sql,$nrows=-1,$offset=-1,$inputarr=false,$secs2cache=0)
	{
		$nrows = (int) $nrows;
		$offset = (int) $offset;
		$offsetStr = ($offset >= 0) ? " OFFSET ".((integer)$offset) : '';
		$limitStr  = ($nrows >= 0)  ? " LIMIT ".((integer)$nrows) : '';
		if ($secs2cache)
			$rs = $this->CacheExecute($secs2cache,$sql."$limitStr$offsetStr",$inputarr);
		else
			$rs = $this->Execute($sql."$limitStr$offsetStr",$inputarr);

		return $rs;
	}

	/*
	function Prepare($sql)
	{
		$info = $this->ServerInfo();
		if ($info['version']>=7.3) {
			return array($sql,false);
		}
		return $sql;
	}
	*/

	/**
	 * Generate the SQL to retrieve MetaColumns data
	 * @param string $table Table name
	 * @param string $schema Schema name (can be blank)
	 * @return string SQL statement to execute
	 */
	protected function _generateMetaColumnsSQL($table, $schema)
	{
		if ($schema) {
			return sprintf($this->metaColumnsSQL1, $table, $table, $table, $schema);
		}
		else {
			return sprintf($this->metaColumnsSQL, $table, $table, $schema);
		}
	}

	/**
	 * @returns assoc array where keys are tables, and values are foreign keys
	 */
	function MetaForeignKeys($table, $owner=false, $upper=false)
	{
		# Regex isolates the 2 terms between parenthesis using subexpressions
		$regex = '^.*\((.*)\).*\((.*)\).*$';
		$sql="
			SELECT
				lookup_table,
				regexp_replace(consrc, '$regex', '\\2') AS lookup_field,
				dep_table,
				regexp_replace(consrc, '$regex', '\\1') AS dep_field
			FROM (
				SELECT
					pg_get_constraintdef(c.oid) AS consrc,
					t.relname AS dep_table,
					ft.relname AS lookup_table
				FROM pg_constraint c
				JOIN pg_class t ON (t.oid = c.conrelid)
				JOIN pg_class ft ON (ft.oid = c.confrelid)
				JOIN pg_namespace nft ON (nft.oid = ft.relnamespace)
				LEFT JOIN pg_description ds ON (ds.objoid = c.oid)
				JOIN pg_namespace n ON (n.oid = t.relnamespace)
				WHERE c.contype = 'f'::\"char\"
				ORDER BY t.relname, n.nspname, c.conname, c.oid
				) constraints
			WHERE
				dep_table='".strtolower($table)."'
			ORDER BY
				lookup_table,
				dep_table,
				dep_field";
		$rs = $this->Execute($sql);

		if (!$rs || $rs->EOF) return false;

		$a = array();
		while (!$rs->EOF) {
			if ($upper) {
				$a[strtoupper($rs->Fields('lookup_table'))][] = strtoupper(str_replace('"','',$rs->Fields('dep_field').'='.$rs->Fields('lookup_field')));
			} else {
				$a[$rs->Fields('lookup_table')][] = str_replace('"','',$rs->Fields('dep_field').'='.$rs->Fields('lookup_field'));
			}
			$rs->MoveNext();
		}

		return $a;

	}

	// from  Edward Jaramilla, improved version - works on pg 7.4
	function _old_MetaForeignKeys($table, $owner=false, $upper=false)
	{
		$sql = 'SELECT t.tgargs as args
		FROM
		pg_trigger t,pg_class c,pg_proc p
		WHERE
		t.tgenabled AND
		t.tgrelid = c.oid AND
		t.tgfoid = p.oid AND
		p.proname = \'RI_FKey_check_ins\' AND
		c.relname = \''.strtolower($table).'\'
		ORDER BY
			t.tgrelid';

		$rs = $this->Execute($sql);

		if (!$rs || $rs->EOF) return false;

		$arr = $rs->GetArray();
		$a = array();
		foreach($arr as $v) {
			$data = explode(chr(0), $v['args']);
			$size = count($data)-1; //-1 because the last node is empty
			for($i = 4; $i < $size; $i++) {
				if ($upper)
					$a[strtoupper($data[2])][] = strtoupper($data[$i].'='.$data[++$i]);
				else
					$a[$data[2]][] = $data[$i].'='.$data[++$i];
			}
		}
		return $a;
	}

	function _query($sql,$inputarr=false)
	{
		if (! $this->_bindInputArray) {
			// We don't have native support for parameterized queries, so let's emulate it at the parent
			return ADODB_postgres64::_query($sql, $inputarr);
		}

		$this->_pnum = 0;
		$this->_errorMsg = false;
		// -- added Cristiano da Cunha Duarte
		if ($inputarr) {
			$sqlarr = explode('?',trim($sql));
			$sql = '';
			$i = 1;
			$last = sizeof($sqlarr)-1;
			foreach($sqlarr as $v) {
				if ($last < $i) $sql .= $v;
				else $sql .= $v.' $'.$i;
				$i++;
			}

			$rez = pg_query_params($this->_connectionID,$sql, $inputarr);
		} else {
			$rez = pg_query($this->_connectionID,$sql);
		}
		// check if no data returned, then no need to create real recordset
		if ($rez && pg_num_fields($rez) <= 0) {
			if (is_resource($this->_resultid) && get_resource_type($this->_resultid) === 'pgsql result') {
				pg_free_result($this->_resultid);
			}
			$this->_resultid = $rez;
			return true;
		}
		return $rez;
	}

	// this is a set of functions for managing client encoding - very important if the encodings
	// of your database and your output target (i.e. HTML) don't match
	//for instance, you may have UNICODE database and server it on-site as WIN1251 etc.
	// GetCharSet - get the name of the character set the client is using now
	// the functions should work with Postgres 7.0 and above, the set of charsets supported
	// depends on compile flags of postgres distribution - if no charsets were compiled into the server
	// it will return 'SQL_ANSI' always
	function GetCharSet()
	{
		//we will use ADO's builtin property charSet
		$this->charSet = @pg_client_encoding($this->_connectionID);
		if (!$this->charSet) {
			return false;
		} else {
			return $this->charSet;
		}
	}

	// SetCharSet - switch the client encoding
	function SetCharSet($charset_name)
	{
		$this->GetCharSet();
		if ($this->charSet !== $charset_name) {
			$if = pg_set_client_encoding($this->_connectionID, $charset_name);
			if ($if == "0" & $this->GetCharSet() == $charset_name) {
				return true;
			} else return false;
		} else return true;
	}

}

/*--------------------------------------------------------------------------------------
	Class Name: Recordset
--------------------------------------------------------------------------------------*/

class ADORecordSet_postgres7 extends ADORecordSet_postgres64{

	var $databaseType = "postgres7";


	function __construct($queryID, $mode=false)
	{
		parent::__construct($queryID, $mode);
	}

	// 10% speedup to move MoveNext to child class
	function MoveNext()
	{
		if (!$this->EOF) {
			$this->_currentRow++;
			if ($this->_numOfRows < 0 || $this->_numOfRows > $this->_currentRow) {
				$this->fields = @pg_fetch_array($this->_queryID,$this->_currentRow,$this->fetchMode);

				if (is_array($this->fields)) {
					if ($this->fields && isset($this->_blobArr)) $this->_fixblobs();
					return true;
				}
			}
			$this->fields = false;
			$this->EOF = true;
		}
		return false;
	}

}

class ADORecordSet_assoc_postgres7 extends ADORecordSet_postgres64{

	var $databaseType = "postgres7";


	function __construct($queryID, $mode=false)
	{
		parent::__construct($queryID, $mode);
	}

	function _fetch()
	{
		if ($this->_currentRow >= $this->_numOfRows && $this->_numOfRows >= 0) {
			return false;
		}

		$this->fields = @pg_fetch_array($this->_queryID,$this->_currentRow,$this->fetchMode);

		if ($this->fields) {
			if (isset($this->_blobArr)) $this->_fixblobs();
			$this->_updatefields();
		}

		return (is_array($this->fields));
	}

	function MoveNext()
	{
		if (!$this->EOF) {
			$this->_currentRow++;
			if ($this->_numOfRows < 0 || $this->_numOfRows > $this->_currentRow) {
				$this->fields = @pg_fetch_array($this->_queryID,$this->_currentRow,$this->fetchMode);

				if (is_array($this->fields)) {
					if ($this->fields) {
						if (isset($this->_blobArr)) $this->_fixblobs();

						$this->_updatefields();
					}
					return true;
				}
			}


			$this->fields = false;
			$this->EOF = true;
		}
		return false;
	}
}
