rhymix/classes/db/DBPostgresql.class.php
mosmartin 4d272994dd english comments added
git-svn-id: http://xe-core.googlecode.com/svn/branches/1.5.0_english@8278 201d5d3c-b55e-5fd7-737f-ddc643e51545
2011-04-06 16:48:06 +00:00

920 lines
30 KiB
PHP

<?php
/**
* @class DBPostgreSQL
* @author ioseph (ioseph@postgresql.kr) updated by yoonjong.joh@gmail.com
* @brief Class to use PostgreSQL DBMS
* @version 0.2
*
* postgresql handling class
* 2009.02.10 update and delete query for the table name at runtime, eliminating the alias to use. Not Supported
* when running order by clause column alias to run a function to replace parts.
* 2009.02.11 dropColumn() function added
* 2009.02.13 addColumn() function changes
**/
class DBPostgresql extends DB
{
/**
* @brief Connection information for PostgreSQL DB
**/
var $hostname = '127.0.0.1'; ///< hostname
var $userid = null; ///< user id
var $password = null; ///< password
var $database = null; ///< database
var $prefix = 'xe'; // / <prefix of a tablename (One or more XEs can be installed in a single DB)
var $comment_syntax = '/* %s */';
/**
* @brief column type used in postgresql
*
* Becasue a common column type in schema/query xml is used for colum_type,
* it should be replaced properly for each DBMS
**/
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 create an instance of this class
*/
function create()
{
return new DBPostgresql;
}
/**
* @brief Return if it is installable
**/
function isSupported()
{
if (!function_exists('pg_connect'))
return false;
return true;
}
/**
* @brief DB settings and 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 Connection
**/
function _connect()
{
// the connection string for PG
$conn_string = "";
// Ignore if no DB information exists
if (!$this->hostname || !$this->userid || !$this->database)
return;
// Create connection string
$conn_string .= ($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" : "";
// Attempt to connect
$this->fd = @pg_connect($conn_string);
if (!$this->fd || pg_connection_status($this->fd) != PGSQL_CONNECTION_OK) {
$this->setError(-1, "CONNECTION FAILURE");
return;
}
// Check connections
$this->is_connected = true;
$this->password = md5($this->password);
// Set utf8
//$this ->_query('set client_encoding to uhc');
}
/**
* @brief DB disconnection
**/
function close()
{
if (!$this->isConnected())
return;
@pg_close($this->fd);
}
/**
* @brief Add quotes on the string variables in a query
**/
function addQuotes($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 $string;
}
/**
* @brief Begin transaction
**/
function begin()
{
if (!$this->isConnected() || $this->transaction_started == false)
return;
if ($this->_query($this->fd, 'BEGIN'))
$this->transaction_started = true;
}
/**
* @brief Rollback
**/
function rollback()
{
if (!$this->isConnected() || $this->transaction_started == false)
return;
if ($this->_query($this->fd, 'ROLLBACK'))
$this->transaction_started = false;
}
/**
* @brief Commits
**/
function commit()
{
if (!$this->isConnected() || $this->transaction_started == false)
return;
if ($this->_query($this->fd, 'COMMIT'))
$this->transaction_started = false;
}
/**
* @brief : Run a query and fetch the result
*
* query: run a query and return the result \n
* fetch: NULL if no value is returned \n
* array object if rows are returned \n
* object if a row is returned \n
* return\n
**/
function _query($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);
}
}
*/
// Notify to start a query execution
$this->actStart($query);
$arr = array('Hello', 'World!', 'Beautiful', 'Day!');
// Run the query statement
$result = @pg_query($this->fd, $query);
// Error Check
if (!$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));
}
// Notify to complete a query execution
$this->actFinish();
// Return result
return $result;
}
/**
* @brief Fetch results
**/
function _fetch($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 Return sequence value incremented by 1(in postgresql, auto_increment is used in the sequence table only)
**/
function getNextSequence()
{
$query = sprintf("select nextval('%ssequence') as seq", $this->prefix);
$result = $this->_query($query);
$tmp = $this->_fetch($result);
return $tmp->seq;
}
/**
* @brief Return if a table already exists
**/
function isTableExists($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 (!$tmp)
return false;
return true;
}
/**
* @brief Add a column to a table
**/
function addColumn($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 Return column information of a table
**/
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 Add an index to a table
* $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;
// Use a tablename before an index name to avoid defining the same index
$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 Delete a column from a table
**/
function dropColumn($table_name, $column_name)
{
$query = sprintf("alter table %s%s drop %s ", $this->prefix, $table_name, $column_name);
$this->_query($query);
}
/**
* @brief Drop an index from a table
**/
function dropIndex($table_name, $index_name, $is_unique = false)
{
if (strpos($table_name, $this->prefix) === false)
$table_name = $this->prefix . $table_name;
// Use a tablename before an index name to avoid defining the same index
$index_name = $table_name . $index_name;
$query = sprintf("drop index %s", $index_name);
$this->_query($query);
}
/**
* @brief Return index information of a table
**/
function isIndexExists($table_name, $index_name)
{
if (strpos($table_name, $this->prefix) === false)
$table_name = $this->prefix . $table_name;
// Use a tablename before an index name to avoid defining the same index
$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 Create a table by using xml file
**/
function createTableByXml($xml_doc)
{
return $this->_createTable($xml_doc);
}
/**
* @brief Create a table by using xml file
**/
function createTableByXmlFile($file_name)
{
if (!file_exists($file_name))
return;
// read xml file
$buff = FileHandler::readFile($file_name);
return $this->_createTable($buff);
}
/**
* @brief generate a query statement to create a table by using schema xml
*
* 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);
// Create a table schema
$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 Return conditional clause
**/
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', 'array'))) continue;
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 $condition;
}
/**
* @brief Handle the insertAct
**/
function _executeInsertAct($output)
{
// List tables
foreach ($output->tables as $key => $val) {
$table_list[] = $this->prefix . $val;
}
// List columns
foreach ($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 Handle updateAct
**/
function _executeUpdateAct($output)
{
// List tables
foreach ($output->tables as $key => $val) {
//$table_list[] = $this->prefix.$val.' as '.$key;
$table_list[] = $this->prefix . $val;
}
// List columns
foreach ($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);
}
}
// List the conditional clause
$condition = $this->getCondition($output);
$query = sprintf("update %s set %s %s", implode(',', $table_list), implode(',',
$column_list), $condition);
return $this->_query($query);
}
/**
* @brief Handle deleteAct
**/
function _executeDeleteAct($output)
{
// List tables
foreach ($output->tables as $key => $val) {
$table_list[] = $this->prefix . $val;
}
// List the conditional clause
$condition = $this->getCondition($output);
$query = sprintf("delete from %s %s", implode(',', $table_list), $condition);
return $this->_query($query);
}
/**
* @brief Handle selectAct
*
* In order to get a list of pages easily when selecting \n
* it supports a method as navigation
**/
function _executeSelectAct($output)
{
// List tables
$table_list = array();
foreach ($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 . ')';
}
}
$click_count = array();
if(!$output->columns){
$output->columns = array(array('name'=>'*'));
}
$column_list = array();
foreach ($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)
$column_list[$alias] = sprintf('%s as %s', $name, $alias);
else
$column_list[] = sprintf('%s', $name);
} else {
if ($alias)
$column_list[$alias] = sprintf('%s as %s', $name, $alias);
else
$column_list[] = sprintf('%s', $name);
}
}
$columns = implode(',', $column_list);
$condition = $this->getCondition($output);
$output->column_list = $column_list;
if ($output->list_count && $output->page)
return $this->_getNavigationData($table_list, $columns, $left_join, $condition,
$output);
// Add a condition to use an index when sorting in order by list_order, update_order
if ($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 ', $col);
}
}
}
if (count($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[] = $alias;
break;
}
}
if($column_list[$gval]) $output->arg_columns[] = $column_list[$gval];
}
$groupby_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], $val[1]);
if(count($output->arg_columns) && $column_list[$val[0]]) $output->arg_columns[] = $column_list[$val[0]];
}
if (count($index_list)) $orderby_query = ' order by ' . implode(',', $index_list);
}
if(count($output->arg_columns))
{
$columns = join(',',$output->arg_columns);
}
$query = sprintf("select %s from %s %s %s %s", $columns, implode(',', $table_list), implode(' ', $left_join), $condition, $groupby_query.$orderby_query);
$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 $buff;
}
/**
* @brief Paging is handled if navigation information exists in the query xml
*
* It is quite convenient although its structure is not good at all .. -_-;
**/
function _getNavigationData($table_list, $columns, $left_join, $condition, $output)
{
require_once (_XE_PATH_ . 'classes/page/PageHandler.class.php');
$column_list = $output->column_list;
/*
// Modified to find total number of SELECT queries having group by clause
// If it works correctly, uncomment the following codes
//
$count_condition = count($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);
}
*/
// Get a total count
$count_query = sprintf("select count(*) as count from %s %s %s", implode(',', $table_list), implode(' ', $left_join), $condition);
$count_query .= (__DEBUG_QUERY__&1 && $output->query_id)?sprintf(' '.$this->comment_syntax,$this->query_id . ' count(*)'):'';
$result = $this->_query($count_query);
$count_output = $this->_fetch($result);
$total_count = (int)$count_output->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)
$page = 1;
// Get a total page
if ($total_count) $total_page = (int)(($total_count - 1) / $list_count) + 1;
else $total_page = 1;
// Check Page variables
if ($page > $total_page) $page = $total_page;
$start_count = ($page - 1) * $list_count;
// Add a condition to use an index when sorting in order by list_order, update_order
if ($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 ', $col);
}
}
}
if (count($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[] = $alias;
break;
}
}
if($column_list[$gval]) $output->arg_columns[] = $column_list[$gval];
}
$groupby_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], $val[1]);
if(count($output->arg_columns) && $column_list[$val[0]]) $output->arg_columns[] = $column_list[$val[0]];
}
if (count($index_list)) $orderby_query = ' order by ' . implode(',', $index_list);
}
if(count($output->arg_columns))
{
$columns = join(',',$output->arg_columns);
}
$query = sprintf("select %s from %s %s %s", $columns, implode(',', $table_list), implode(' ', $left_join), $condition);
$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;
}
}
return new DBPostgresql;
?>