<?php
/**
 * @class DBPostgreSQL
 * @author ioseph (ioseph@postgresql.kr) updated by yoonjong.joh@gmail.com
 * @brief MySQL DBMS를 이용하기 위한 class
 * @version 0.2
 *
 * postgresql handling class
 * 2009.02.10  update 와 delete query를 실행할때 table 이름에 alias 사용하는 것을 없앰. 지원 안함
 *             order by clause를 실행할때 함수를 실행 하는 부분을 column alias로 대체.
 * 2009.02.11  dropColumn() function이 추가  
 * 2009.02.13  addColumn() 함수 변경
 **/

class DBPostgresql extends DB
{

    /**
     * @brief PostgreSQL DB에 접속하기 위한 정보
     **/
    var $hostname = '127.0.0.1'; ///< hostname
    var $userid = null; ///< user id
    var $password = null; ///< password
    var $database = null; ///< database
    var $prefix = 'xe'; ///< XE에서 사용할 테이블들의 prefix  (한 DB에서 여러개의 XE설치 가능)
	var $comment_syntax = '/* %s */';

    /**
     * @brief postgresql에서 사용될 column type
     *
     * column_type은 schema/query xml에서 공통 선언된 type을 이용하기 때문에
     * 각 DBMS에 맞게 replace 해주어야 한다
     **/
    var $column_type = array(
        'bignumber' => 'bigint', 
        'number' => 'integer',
        'varchar' => 'varchar', 
        'char' => 'char', 
        'text' => 'text', 
        'bigtext' => 'text',
        'date' => 'varchar(14)', 
        'float' => 'real',
    );

    /**
     * @brief constructor
     **/
    function DBPostgresql()
    {
        $this->_setDBInfo();
        $this->_connect();
    }

    /**
     * @brief 설치 가능 여부를 return
     **/
    function isSupported()
    {
        if (!function_exists('pg_connect'))
            return false;
        return true;
    }

    /**
     * @brief DB정보 설정 및 connect/ close
     **/
    function _setDBInfo()
    {
        $db_info = Context::getDBInfo();
        $this->hostname = $db_info->db_hostname;
        $this->port = $db_info->db_port;
        $this->userid = $db_info->db_userid;
        $this->password = $db_info->db_password;
        $this->database = $db_info->db_database;
        $this->prefix = $db_info->db_table_prefix;
        if (!substr($this->prefix, -1) != '_')
            $this->prefix .= '_';
    }

    /**
     * @brief DB 접속
     **/
    function _connect()
    {
        // pg용 connection string
        $conn_string = "";

        // db 정보가 없으면 무시
        if (!$this->hostname || !$this->userid || !$this->database)
            return;

        // connection string 만들기
        $conn_string .= ($this->hostname) ? " host=$this->hostname" : "";
        $conn_string .= ($this->userid) ? " user=$this->userid" : "";
        $conn_string .= ($this->password) ? " password=$this->password" : "";
        $conn_string .= ($this->database) ? " dbname=$this->database" : "";
        $conn_string .= ($this->port) ? " port=$this->port" : "";

        // 접속시도
        $this->fd = @pg_connect($conn_string);
        if (!$this->fd || pg_connection_status($this->fd) != PGSQL_CONNECTION_OK) {
            $this->setError(-1, "CONNECTION FAILURE");
            return;
        }

        // 접속체크
        $this->is_connected = true;
		$this->password = md5($this->password);
        // utf8임을 지정
        //$this ->_query('set client_encoding to uhc');
    }

    /**
     * @brief DB접속 해제
     **/
    function close()
    {
        if (!$this->isConnected())
            return;
        @pg_close($this->fd);
    }

    /**
     * @brief 쿼리에서 입력되는 문자열 변수들의 quotation 조절
     **/
    function addQuotes($string)
    {
        if (version_compare(PHP_VERSION, "5.9.0", "<") && get_magic_quotes_gpc())
            $string = stripslashes(str_replace("\\", "\\\\", $string));
        if (!is_numeric($string))
            $string = @pg_escape_string($string);
        return $string;
    }

    /**
     * @brief 트랜잭션 시작
     **/
    function begin()
    {
        if (!$this->isConnected() || $this->transaction_started == false)
            return;
        if ($this->_query($this->fd, 'BEGIN'))
            $this->transaction_started = true;
    }

    /**
     * @brief 롤백
     **/
    function rollback()
    {
        if (!$this->isConnected() || $this->transaction_started == false)
            return;
        if ($this->_query($this->fd, 'ROLLBACK'))
            $this->transaction_started = false;
    }

    /**
     * @brief 커밋
     **/
    function commit()
    {
        if (!$this->isConnected() || $this->transaction_started == false)
            return;
        if ($this->_query($this->fd, 'COMMIT'))
            $this->transaction_started = false;
    }

    /**
     * @brief : 쿼리문의 실행 및 결과의 fetch 처리
     *
     * query : query문 실행하고 result return\n
     * fetch : reutrn 된 값이 없으면 NULL\n
     *         rows이면 array object\n
     *         row이면 object\n
     *         return\n
     **/
    function _query($query)
    {
        if (!$this->isConnected())
            return;

        /*
        $l_query_array = explode(" ", $query);
        if ($l_query_array[0] = "update")
        {
        if (strtolower($l_query_array[2]) == "as")
        {
        $l_query_array[2] = "";
        $l_query_array[3] = "";
        $query = implode(" ",$l_query_array);
        }
        }
        else if ($l_query_array[0] = "delete") 
        {
        if (strtolower($l_query_array[3]) == "as")
        {
        $l_query_array[3] = "";
        $l_query_array[4] = "";            
        $query = implode(" ",$l_query_array);
        }
        }
        */

        // 쿼리 시작을 알림
        $this->actStart($query);
        $arr = array('Hello', 'World!', 'Beautiful', 'Day!');


        // 쿼리 문 실행
        $result = @pg_query($this->fd, $query);

        // 오류 체크
        if (!$result) {
            //              var_dump($l_query_array);
            //var_dump($query);
            //die("\nin query statement\n");
            //var_dump(debug_backtrace());
            $this->setError(1, pg_last_error($this->fd));
        }

        // 쿼리 실행 종료를 알림
        $this->actFinish();

        // 결과 리턴
        return $result;
    }

    /**
     * @brief 결과를 fetch
     **/
    function _fetch($result)
    {
        if (!$this->isConnected() || $this->isError() || !$result)
            return;
        while ($tmp = pg_fetch_object($result)) {
            $output[] = $tmp;
        }
        if (count($output) == 1)
            return $output[0];
        return $output;
    }

    /**
     * @brief 1씩 증가되는 sequence값을 return (postgresql의 auto_increment는 sequence테이블에서만 사용)
     **/
    function getNextSequence()
    {
        $query = sprintf("select nextval('%ssequence') as seq", $this->prefix);
        $result = $this->_query($query);
        $tmp = $this->_fetch($result);
        return $tmp->seq;
    }

    /**
     * @brief 테이블 기생성 여부 return
     **/
    function isTableExists($target_name)
    {
        if ($target_name == "sequence")
            return true;
        $query = sprintf("SELECT tablename FROM pg_tables WHERE tablename = '%s%s' AND schemaname = current_schema()",
            $this->prefix, $this->addQuotes($target_name));

        $result = $this->_query($query);
        $tmp = $this->_fetch($result);
        if (!$tmp)
            return false;
        return true;
    }

    /**
     * @brief 특정 테이블에 특정 column 추가
     **/
    function addColumn($table_name, $column_name, $type = 'number', $size = '', $default =
        NULL, $notnull = false)
    {
        $type = $this->column_type[$type];
        if (strtoupper($type) == 'INTEGER' || strtoupper($type) == 'BIGINT')
            $size = '';

        $query = sprintf("alter table %s%s add %s ", $this->prefix, $table_name, $column_name);

        if ($size)
            $query .= sprintf(" %s(%s) ", $type, $size);
        else
            $query .= sprintf(" %s ", $type);

        $this->_query($query);

        if (isset($default)) {
            $query = sprintf("alter table %s%s alter %s  set default '%s' ", $this->prefix, $table_name, $column_name, $default);
            $this->_query($query);
        }
        if ($notnull) {
            $query = sprintf("update %s%s set %s  = %s ", $this->prefix, $table_name, $column_name, $default);
            $this->_query($query);              
            $query = sprintf("alter table %s%s alter %s  set not null ", $this->prefix, $table_name, $column_name);
            $this->_query($query);
        }
    }


    /**
     * @brief 특정 테이블의 column의 정보를 return
     **/
    function isColumnExists($table_name, $column_name)
    {
        $query = sprintf("SELECT attname FROM pg_attribute WHERE attrelid = (SELECT oid FROM pg_class WHERE relname = '%s%s') AND attname = '%s'",
            $this->prefix, strtolower($table_name), strtolower($column_name));

        // $query = sprintf("select column_name from information_schema.columns where table_schema = current_schema() and table_name = '%s%s' and column_name = '%s'", $this->prefix, $this->addQuotes($table_name), strtolower($column_name));
        $result = $this->_query($query);
        if ($this->isError()) {
            return;
        }
        $output = $this->_fetch($result);
        if ($output) {
            return true;
        }
        return false;
    }

    /**
     * @brief 특정 테이블에 특정 인덱스 추가
     * $target_columns = array(col1, col2)
     * $is_unique? unique : none
     **/
    function addIndex($table_name, $index_name, $target_columns, $is_unique = false)
    {
        if (!is_array($target_columns))
            $target_columns = array($target_columns);

        if (strpos($table_name, $this->prefix) === false)
            $table_name = $this->prefix . $table_name;

        // index_name의 경우 앞에 table이름을 붙여줘서 중복을 피함
        $index_name = $table_name . $index_name;

        $query = sprintf("create %s index %s on %s (%s);", $is_unique ? 'unique' : '', $index_name,
            $table_name, implode(',', $target_columns));
        $this->_query($query);
    }

    /**
     * @brief 특정 테이블에 특정 column 제거
     **/
    function dropColumn($table_name, $column_name)
    {
        $query = sprintf("alter table %s%s drop %s ", $this->prefix, $table_name, $column_name);
        $this->_query($query);
    }

    /**
     * @brief 특정 테이블의 특정 인덱스 삭제
     **/
    function dropIndex($table_name, $index_name, $is_unique = false)
    {
        if (strpos($table_name, $this->prefix) === false)
            $table_name = $this->prefix . $table_name;

        // index_name의 경우 앞에 table이름을 붙여줘서 중복을 피함
        $index_name = $table_name . $index_name;

        $query = sprintf("drop index %s", $index_name);
        $this->_query($query);
    }


    /**
     * @brief 특정 테이블의 index 정보를 return
     **/
    function isIndexExists($table_name, $index_name)
    {
        if (strpos($table_name, $this->prefix) === false)
            $table_name = $this->prefix . $table_name;

        // index_name의 경우 앞에 table이름을 붙여줘서 중복을 피함
        $index_name = $table_name . $index_name;

        //$query = sprintf("show indexes from %s%s where key_name = '%s' ", $this->prefix, $table_name, $index_name);
        $query = sprintf("select indexname from pg_indexes where schemaname = current_schema() and tablename = '%s' and indexname = '%s'",
            $table_name, strtolower($index_name));
        $result = $this->_query($query);
        if ($this->isError())
            return;
        $output = $this->_fetch($result);

        if ($output) {
            return true;
        }
        //                var_dump($query);
        //                die(" no index");
        return false;
    }

    /**
     * @brief xml 을 받아서 테이블을 생성
     **/
    function createTableByXml($xml_doc)
    {
        return $this->_createTable($xml_doc);
    }

    /**
     * @brief xml 을 받아서 테이블을 생성
     **/
    function createTableByXmlFile($file_name)
    {
        if (!file_exists($file_name))
            return;
        // xml 파일을 읽음
        $buff = FileHandler::readFile($file_name);
        return $this->_createTable($buff);
    }

    /**
     * @brief schema xml을 이용하여 create table query생성
     *
     * type : number, varchar, text, char, date, \n
     * opt : notnull, default, size\n
     * index : primary key, index, unique\n
     **/
    function _createTable($xml_doc)
    {
        // xml parsing
        $oXml = new XmlParser();
        $xml_obj = $oXml->parse($xml_doc);

        // 테이블 생성 schema 작성
        $table_name = $xml_obj->table->attrs->name;

        if ($table_name == 'sequence') {
            $query = sprintf('create sequence %s', $this->prefix . $table_name);
            return $this->_query($query);
        }

        if ($this->isTableExists($table_name))
            return;
        $table_name = $this->prefix . $table_name;

        if (!is_array($xml_obj->table->column))
            $columns[] = $xml_obj->table->column;
        else
            $columns = $xml_obj->table->column;

        foreach ($columns as $column) {
            $name = $column->attrs->name;
            $type = $column->attrs->type;
            $size = $column->attrs->size;
            $notnull = $column->attrs->notnull;
            $primary_key = $column->attrs->primary_key;
            $index = $column->attrs->index;
            $unique = $column->attrs->unique;
            $default = $column->attrs->default;
            $auto_increment = $column->attrs->auto_increment;

            if ($type == "bignumber" || $type == "number")
                $size = 0;

            $column_schema[] = sprintf('%s %s%s %s %s', $name, $this->column_type[$type], $size ?
                '(' . $size . ')' : '', isset($default) ? "default '" . $default . "'" : '', $notnull ?
                'not null' : '');

            if ($primary_key)
                $primary_list[] = $name;
            else
                if ($unique)
                    $unique_list[$unique][] = $name;
                else
                    if ($index)
                        $index_list[$index][] = $name;
        }

        if (count($primary_list)) {
            $column_schema[] = sprintf("primary key (%s)", implode($primary_list, ','));
        }

        if (count($unique_list)) {
            foreach ($unique_list as $key => $val) {
                $column_schema[] = sprintf("unique (%s)", implode($val, ','));
            }
        }


        $schema = sprintf('create table %s (%s%s);', $this->addQuotes($table_name), "\n",
            implode($column_schema, ",\n"));

        $output = $this->_query($schema);

        if (count($index_list)) {
            foreach ($index_list as $key => $val) {
                if (!$this->isIndexExists($table_name, $key))
                    $this->addIndex($table_name, $key, $val);
            }
        }

        if (!$output)
            return false;

    }

    /**
     * @brief 조건문 작성하여 return
     **/
    function getCondition($output)
    {
        if (!$output->conditions)
            return;
        $condition = $this->_getCondition($output->conditions, $output->column_type);
        if ($condition)
            $condition = ' where ' . $condition;
        return $condition;
    }

    function getLeftCondition($conditions, $column_type)
    {
        return $this->_getCondition($conditions, $column_type);
    }


    function _getCondition($conditions, $column_type)
    {
        $condition = '';
        foreach ($conditions as $val) {
            $sub_condition = '';
            foreach ($val['condition'] as $v) {
                if (!isset($v['value']))
                    continue;
                if ($v['value'] === '')
                    continue;
                if (!in_array(gettype($v['value']), array('string', 'integer', 'double')))
                    continue;

                $name = $v['column'];
                $operation = $v['operation'];
                $value = $v['value'];
                $type = $this->getColumnType($column_type, $name);
                $pipe = $v['pipe'];

                $value = $this->getConditionValue($name, $value, $operation, $type, $column_type);
                if (!$value)
                    $value = $v['value'];
                $str = $this->getConditionPart($name, $value, $operation);
                if ($sub_condition)
                    $sub_condition .= ' ' . $pipe . ' ';
                $sub_condition .= $str;
            }
            if ($sub_condition) {
                if ($condition && $val['pipe'])
                    $condition .= ' ' . $val['pipe'] . ' ';
                $condition .= '(' . $sub_condition . ')';
            }
        }
        return $condition;
    }


    /**
     * @brief insertAct 처리
     **/
    function _executeInsertAct($output)
    {
        // 테이블 정리
        foreach ($output->tables as $key => $val) {
            $table_list[] = $this->prefix . $val;
        }

        // 컬럼 정리
        foreach ($output->columns as $key => $val) {
            $name = $val['name'];
            $value = $val['value'];
            if ($output->column_type[$name] != 'number') {
                $value = "'" . $this->addQuotes($value) . "'";
                if (!$value)
                    $value = 'null';
            } elseif (!$value || is_numeric($value))
                $value = (int)$value;

            $column_list[] = $name;
            $value_list[] = $value;
        }

        $query = sprintf("insert into %s (%s) values (%s);", implode(',', $table_list),
            implode(',', $column_list), implode(',', $value_list));
        return $this->_query($query);
    }

    /**
     * @brief updateAct 처리
     **/
    function _executeUpdateAct($output)
    {
        // 테이블 정리
        foreach ($output->tables as $key => $val) {
            //$table_list[] = $this->prefix.$val.' as '.$key;
            $table_list[] = $this->prefix . $val;
        }

        // 컬럼 정리
        foreach ($output->columns as $key => $val) {
            if (!isset($val['value']))
                continue;
            $name = $val['name'];
            $value = $val['value'];
            if (strpos($name, '.') !== false && strpos($value, '.') !== false)
                $column_list[] = $name . ' = ' . $value;
            else {
                if ($output->column_type[$name] != 'number')
                    $value = "'" . $this->addQuotes($value) . "'";
                elseif (!$value || is_numeric($value))
                    $value = (int)$value;

                $column_list[] = sprintf("%s = %s", $name, $value);
            }
        }

        // 조건절 정리
        $condition = $this->getCondition($output);

        $query = sprintf("update %s set %s %s", implode(',', $table_list), implode(',',
            $column_list), $condition);

        return $this->_query($query);
    }

    /**
     * @brief deleteAct 처리
     **/
    function _executeDeleteAct($output)
    {
        // 테이블 정리
        foreach ($output->tables as $key => $val) {
            $table_list[] = $this->prefix . $val;
        }

        // 조건절 정리
        $condition = $this->getCondition($output);

        $query = sprintf("delete from %s %s", implode(',', $table_list), $condition);

        return $this->_query($query);
    }

    /**
     * @brief selectAct 처리
     *
     * select의 경우 특정 페이지의 목록을 가져오는 것을 편하게 하기 위해\n
     * navigation이라는 method를 제공
     **/
    function _executeSelectAct($output)
    {
        // 테이블 정리
        $table_list = array();
        foreach ($output->tables as $key => $val) {
            $table_list[] = $this->prefix . $val . ' as ' . $key;
        }

        $left_join = array();
        // why???
        $left_tables = (array )$output->left_tables;

        foreach ($left_tables as $key => $val) {
            $condition = $this->_getCondition($output->left_conditions[$key], $output->
                column_type);
            if ($condition) {
                $left_join[] = $val . ' ' . $this->prefix . $output->_tables[$key] . ' as ' . $key .
                    ' on (' . $condition . ')';
            }
        }


        if (!$output->columns) {
            $columns = '*';
        } else {
            $column_list = array();
            foreach ($output->columns as $key => $val) {
                $name = $val['name'];
                $alias = $val['alias'];
                if($val['click_count']) $click_count[] = $val['name'];

                if (substr($name, -1) == '*') {
                    $column_list[] = $name;
                } elseif (strpos($name, '.') === false && strpos($name, '(') === false) {
                    if ($alias)
                        $column_list[] = sprintf('%s as %s', $name, $alias);
                    else
                        $column_list[] = sprintf('%s', $name);
                } else {
                    if ($alias)
                        $column_list[] = sprintf('%s as %s', $name, $alias);
                    else
                        $column_list[] = sprintf('%s', $name);
                }
            }
            $columns = implode(',', $column_list);
        }

        $condition = $this->getCondition($output);

        if ($output->list_count && $output->page)
            return $this->_getNavigationData($table_list, $columns, $left_join, $condition,
                $output);

        // list_order, update_order 로 정렬시에 인덱스 사용을 위해 condition에 쿼리 추가
        if ($output->order) {
            $conditions = $this->getConditionList($output);
            if (!in_array('list_order', $conditions) && !in_array('update_order', $conditions)) {
                foreach ($output->order as $key => $val) {
                    $col = $val[0];
                    if (!in_array($col, array('list_order', 'update_order')))
                        continue;
                    if ($condition)
                        $condition .= sprintf(' and %s < 2100000000 ', $col);
                    else
                        $condition = sprintf(' where %s < 2100000000 ', $col);
                }
            }
        }

        $query = sprintf("select %s from %s %s %s", $columns, implode(',', $table_list),
            implode(' ', $left_join), $condition);

        if (count($output->groups)) {
            /*
            var_dump("= column output start = ");
            var_dump(sizeof ($output->columns) . " = end length == ");
            var_dump($output->columns);
            var_dump("= column output end = " . "\n");
            var_dump($output->groups);
            var_dump("=== " . "\n");
            var_dump(debug_backtrace());
            
            foreach($output->columns as $key => $val) {
            $name = $val['name'];
            $alias = $val['alias'];
            } */
            $group_list = array();
            foreach ($output->groups as $gkey => $gval) {
                foreach ($output->columns as $key => $val) {
                    $name = $val['name'];
                    $alias = $val['alias'];
                    if (trim($name) == trim($gval)) {
                        $group_list[] = $alias;
                        break;
                    }
                }

            }
            $query .= sprintf(' group by %s', implode(',', $group_list));
            //             var_dump($query);
        }

        if ($output->order) {
            foreach ($output->order as $key => $val) {
                $index_list[] = sprintf('%s %s', $val[0], $val[1]);
            }
            if (count($index_list))
                $query .= ' order by ' . implode(',', $index_list);
        }

		$query .= (__DEBUG_QUERY__&1 && $output->query_id)?sprintf(' '.$this->comment_syntax,$this->query_id):'';
        $result = $this->_query($query);
        if ($this->isError())
            return;
        
        if(count($click_count)>0 && count($output->conditions)>0){
            $_query = '';
            foreach($click_count as $k => $c) $_query .= sprintf(',%s=%s+1 ',$c,$c);
            $_query = sprintf('update %s set %s %s',implode(',',$table_list), substr($_query,1),  $condition);
            $this->_query($_query);
        }


        $data = $this->_fetch($result);

        $buff = new Object();
        $buff->data = $data;
        return $buff;
    }

    /**
     * @brief query xml에 navigation 정보가 있을 경우 페이징 관련 작업을 처리한다
     *
     * 그닥 좋지는 않은 구조이지만 편리하다.. -_-;
     **/
    function _getNavigationData($table_list, $columns, $left_join, $condition, $output)
    {
        require_once (_XE_PATH_ . 'classes/page/PageHandler.class.php');

        /*
        // group by 절이 포함된 SELECT 쿼리의 전체 갯수를 구하기 위한 수정
        // 정상적인 동작이 확인되면 주석으로 막아둔 부분으로 대체합니다.
        //
        $count_condition = count($output->groups) ? sprintf('%s group by %s', $condition, implode(', ', $output->groups)) : $condition;
        $total_count = $this->getCountCache($output->tables, $count_condition);
        if ($total_count === false) {
            $count_query = sprintf('select count(*) as count from %s %s %s', implode(', ', $table_list), implode(' ', $left_join), $count_condition);
            if (count($output->groups))
                $count_query = sprintf('select count(*) as count from (%s) xet', $count_query);
            $result = $this->_query($count_query);
            $count_output = $this->_fetch($result);
            $total_count = (int)$count_output->count;
            $this->putCountCache($output->tables, $count_condition, $total_count);
        }
        */

        // 전체 개수를 구함
        $count_query = sprintf("select count(*) as count from %s %s %s", implode(',', $table_list),
            implode(' ', $left_join), $condition);
        $total_count = $this->getCountCache($output->tables, $condition);
        if ($total_count === false) {
            $result = $this->_query($count_query);
            $count_output = $this->_fetch($result);
            $total_count = (int)$count_output->count;
            $this->putCountCache($output->tables, $condition, $total_count);
        }

        $list_count = $output->list_count['value'];
        if (!$list_count)
            $list_count = 20;
        $page_count = $output->page_count['value'];
        if (!$page_count)
            $page_count = 10;
        $page = $output->page['value'];
        if (!$page)
            $page = 1;

        // 전체 페이지를 구함
        if ($total_count)
            $total_page = (int)(($total_count - 1) / $list_count) + 1;
        else
            $total_page = 1;

        // 페이지 변수를 체크
        if ($page > $total_page)
            $page = $total_page;
        $start_count = ($page - 1) * $list_count;

        // list_order, update_order 로 정렬시에 인덱스 사용을 위해 condition에 쿼리 추가
        if ($output->order) {
            $conditions = $this->getConditionList($output);
            if (!in_array('list_order', $conditions) && !in_array('update_order', $conditions)) {
                foreach ($output->order as $key => $val) {
                    $col = $val[0];
                    if (!in_array($col, array('list_order', 'update_order')))
                        continue;
                    if ($condition)
                        $condition .= sprintf(' and %s < 2100000000 ', $col);
                    else
                        $condition = sprintf(' where %s < 2100000000 ', $col);
                }
            }
        }

        $query = sprintf("select %s from %s %s %s", $columns, implode(',', $table_list),
            implode(' ', $left_join), $condition);

        if (count($output->groups))
            $query .= sprintf(' group by %s', implode(',', $output->groups));

        if (count($output->order)) {
            foreach ($output->order as $key => $val) {
                $index_list[] = sprintf('%s %s', $val[0], $val[1]);
            }
            if (count($index_list))
                $query .= ' order by ' . implode(',', $index_list);
        }

        $query = sprintf('%s offset %d limit %d', $query, $start_count, $list_count);
		$query .= (__DEBUG_QUERY__&1 && $output->query_id)?sprintf(' '.$this->comment_syntax,$this->query_id):'';

        $result = $this->_query($query);
        if ($this->isError()) {
            $buff = new Object();
            $buff->total_count = 0;
            $buff->total_page = 0;
            $buff->page = 1;
            $buff->data = array();

            $buff->page_navigation = new PageHandler($total_count, $total_page, $page, $page_count);
            return $buff;
        }

        $virtual_no = $total_count - ($page - 1) * $list_count;
        while ($tmp = pg_fetch_object($result)) {
            $data[$virtual_no--] = $tmp;
        }

        $buff = new Object();
        $buff->total_count = $total_count;
        $buff->total_page = $total_page;
        $buff->page = $page;
        $buff->data = $data;

        $buff->page_navigation = new PageHandler($total_count, $total_page, $page, $page_count);
        return $buff;
    }
}
?>