File models/business/be_schema.php | BEdita API doc

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<?php
/*-----8<--------------------------------------------------------------------
 * 
 * BEdita - a semantic content management framework
 * 
 * Copyright 2010 ChannelWeb Srl, Chialab Srl
 * 
 * This file is part of BEdita: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published 
 * by the Free Software Foundation, either version 3 of the License, or 
 * (at your option) any later version.
 * BEdita is distributed WITHOUT ANY WARRANTY; without even the implied 
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public License 
 * version 3 along with BEdita (see LICENSE.LGPL).
 * If not, see <http://gnu.org/licenses/lgpl-3.0.html>.
 * 
 *------------------------------------------------------------------->8-----
 */
App::import('Model', 'CakeSchema');
class DumpModel extends AppModel {
    var $useTable = "objects";
};    

/**
 * Utility class that handles schema/db issues
 * 
 * @version         $Revision$
 * @modifiedby      $LastChangedBy$
 * @lastmodified    $LastChangedDate$
 * 
 * $Id$
 */
class BeSchema extends CakeSchema
{
    var $useTable = false;

    static $tableOrder = array();
    
    function executeQuery($db, $script) {
        $sql = file_get_contents($script);
        $queries = array();
        $SplitterSql = new SplitterSql() ;
        $SplitterSql->parse($queries, $sql) ;
        foreach($queries as $q) {   
            if(strlen($q)>1) {
                $res = $db->execute($q);
                if($res === false) {
                    throw new BeditaException("Error executing query: ".$q."\n" . "db error msg: " . $db->error ."\n");
                }
            }
        }
    }
    
    function executeInsert($db, $script) {
        // split in blocks
        $blocks = $this->createChunks($script);

        // call query to avoid foreign key checks, on data insert (mysql only)
        if($db->config['driver'] === "mysql") {
            // #CUSTOM QUERY
            $res = $db->execute("SET FOREIGN_KEY_CHECKS=0");
        }
        
        
        // call parse on every block and populate $queries array
        $queries = array();
        $SplitterSql = new SplitterSql() ;
        foreach($blocks as $key => $block) {
            $SplitterSql->parse($queries, $block) ;
            // call queries (except for views creation)
            foreach($queries as $q) {   
                if(strlen($q)>1) {
                    if(strpos($q,"CREATE ALGORITHM") === false) {
                        //echo "executing query " . $q . "\n";
                        $res = $db->execute($q);
                        if($res === false) {
                            throw new Exception("Error executing query: ".$q."\n");
                        }
                    }
                }
            }
        }
    }

    function simpleInsert($db, $sqlFileName) {
        $handle = fopen($sqlFileName, "r");
        if($handle === FALSE) 
            throw new Exception("Error opening file: ".$sqlFileName);
        $q = "";
        while(!feof($handle)) {
            $line = fgets($handle);
            if($line === FALSE && !feof($handle)) {
                throw new Exception("Error reading file line");
            }
            if(strncmp($line, "INSERT INTO ", 12) == 0) {
                if(strlen($q) > 0) {
                    $res = $db->execute($q);
                    if($res === false) {
                        throw new Exception("Error executing query: ".$q."\n");
                    }
                }
                $q="";
            }
            $q .= $line;
        }
        // last query...
        if(strlen($q) > 0) {
            $res = $db->execute($q);
            if($res === false) {
                throw new Exception("Error executing query: ".$q."\n");
            }
        }
    }
    
    private function createChunks($script) {
        $chunks = array();
        $handle = fopen($script, "r");
        $data = "";
        $counter=0;$ccounter=0;
        $endchar = ");\n";
        while (!feof($handle)) {
           $buffer = fgets($handle, 4096);
           $data.=$buffer;
           if($counter>500 && ( substr( $buffer, strlen( $buffer ) - strlen( $endchar ) ) == $endchar ) ) { // check if $counter > 500 and $buffer ends with );
                $counter=0;
                $chunks[$ccounter++]=$data;
                $data="";
           } else {
                $counter++;
           }
        }
        fclose($handle);
        if(empty($chunks)) {
            $chunks[0]=$data;
        }
        return $chunks;
    }

    public function readTables($options = array()) {
        $schemaTabs = $this->read($options);
        if(isset($schemaTabs['tables']['missing'])) {
            unset($schemaTabs['tables']['missing']);
        }
        return $schemaTabs['tables'];
    }

    public function tableMetaData($model, $db) {
        $tableMeta = $this->__columns($model);
        $tableMeta['indexes'] = $db->index($model);
        return $tableMeta;
    }
    
    /**
     * Current tables array
     *
     * @return array, current bedita tables
     */
    public function tableList() {
        return array_keys($this->readTables());
    }
    
    /**
     * Returns an array of tables ordered for INSERT statements (used in import/export)
     *
     * @return array, tables ordered for insert
     */
    public function tableListOrdered() {
        $tabs = $this->tableList();
        usort($tabs, array("BeSchema", "tableOrderCompare"));
        return $tabs;
    }
    
    public static function tableOrderCompare($a, $b) {
        if(empty(self::$tableOrder)) {
            $tabOrderFile = APP . DS . "config" . DS. "sql" . DS . "table_order.php";
            include($tabOrderFile);
            self::$tableOrder = $table_order;
        }
        $aPos = array_search($a, self::$tableOrder);
        $bPos = array_search($b, self::$tableOrder);
        if(empty($aPos))
            return -1;
        if(empty($bPos))
            return 1;
        return ($aPos < $bPos) ? -1 : 1;
    }

    public function checkSequences($db) {
        $driver = $db->config['driver'];
        if($driver == "postgres") {
            // #POSTGRES
            $dumpModel = new DumpModel();
            $result = $db->fetchAll("select sequence_name as name from information_schema.sequences");
            $sequences = array();
            foreach ($result as $item) {
                $sequences[] = $item[0]['name'];
            }
            $tables = $this->tableList();
            foreach ($tables as $t) {
                $dumpModel->setSource($t); 
                $dumpModel->create(); 
                $sch = $dumpModel->schema();
                if(!empty($sch["id"])) {
                    $max = $dumpModel->find('first', array("fields" => array("MAX(id) as max_id")));
                    $newVal = $max[0]['max_id'];
                    if(!empty($newVal)) {
                        $newVal++;
                        $seqName = $t . "_id_seq";
                        if(in_array($seqName, $sequences)) {
                            $q = "ALTER SEQUENCE $seqName RESTART WITH $newVal";
                            $res = $db->query($q);
                        }
                    }
                }
            }
        }
    }
    
    /**
     * Dumps table data to file
     *
     * @param array $tables
     * @param unknown_type $handle
     */
    public function tableDetails(array &$tables, $handle) {

        $dumpModel = new DumpModel();
        foreach ($tables as $t) {
            $dumpModel->setSource($t); 
            $select = $dumpModel->find('all');
            foreach ($select as $sel) {
                $fields = "";
                $values = "";
                $count = 0;
                foreach ($sel['DumpModel'] as $k=>$v) {
                    if($v !== NULL) {
                        if($count > 0) {
                            $fields .= ",";
                            $values .= ",";
                        }
                        $fields .= $k;
                        $values .= "'".addslashes($v)."'";
                        $count++;
                    }
                }
                // #CUSTOM QUERY
                $res = "INSERT INTO $t (".$fields.") VALUES ($values);\n";
                fwrite($handle, $res);
            }
        }
    }
}

class SplitterSql {
    
    var $fnc_stringa            = null ;
    var $fnc_command            = null ;
    var $fnc_error              = null ;

    var $_LEX_BUFFER            = "" ;
    var $_LEX_INSIDE_STRING     = false ;
    var $_LEX_START_STRING      = "" ;
    var $_BUFFER_COMMAND        = "" ;
    var $_LEX_DELIMITER_COMMAND = ";" ;
    
    var $LEX_STRING         = 4 ;
    var $LEX_END_STRING     = 5 ;
    var $LEX_INIT_COMMAND   = 6 ;
    var $LEX_COMMAND        = 7 ;
    var $LEX_DELIMITER      = 8 ;
    var $LEX_COMMENT        = 9 ;
    
    var $LEX_ERROR_STRING   = 108 ;
    var $LEX_ERROR_COMMAND  = 109 ;
    
    var $LEX_ERROR  = 1000 ;
    var $LEX_EOF    = 2000 ;
    
    function parse(&$queries, $SQL) {
        $queries = array() ;
        while(strlen($SQL)) {       
            $result = $this->lex($SQL) ;
            switch($result) {
                case $this->LEX_STRING:     break ;
                case $this->LEX_COMMENT:    break ;
                case $this->LEX_DELIMITER:  break ;
                case $this->LEX_END_STRING: { 
                    $this->_BUFFER_COMMAND  .= $this->_LEX_START_STRING . $this->_LEX_BUFFER . $this->_LEX_START_STRING ;
                    $this->_LEX_BUFFER       = "" ;
                } break ;

                case $this->LEX_INIT_COMMAND: { 
                    $this->_BUFFER_COMMAND  .= " " . $this->_LEX_BUFFER ;
                    $this->_LEX_BUFFER       = "" ;
                } break ;

                case $this->LEX_COMMAND: { 
                    $this->_BUFFER_COMMAND  .= " " . $this->_LEX_BUFFER ;

                    $queries[] = $this->_BUFFER_COMMAND ;
                    
                    $this->_BUFFER_COMMAND  = "" ; 
                    $this->_LEX_BUFFER      = "" ;
                } break ;
                
                case $this->LEX_ERROR:
                {
                    if(isset($this->fnc_errore)) {
                        call_user_func(array(&$target, $this->fnc_errore), $this->_LEX_BUFFER) ;
                        return false ;
                    }
                    return false ;
                }
                break ;
                case $this->LEX_EOF: return true ;
            }
            
        }
        
        return true ;
    }

    function lex(&$expression) {
    
        // If inside a string, return all characters until end of string
        if($this->_LEX_INSIDE_STRING) {
            $regexp = "/^([^\\". $this->_LEX_START_STRING ."]*)/xi" ;
            if(preg_match($regexp, $expression, $matches)) {
                $expression = substr($expression, strlen($matches[0])+1) ;
                $this->_LEX_BUFFER = $matches[1] ;
                $this->_LEX_INSIDE_STRING = false ;
                return $this->LEX_END_STRING ;
            } else {            
                return $this->LEX_ERROR_STRING ;
            }
            return ;
        }
        
        // If a comment, delete it
        if(preg_match("/^\s*--(.*)/xi", $expression, $matches)) {
            $expression = preg_replace("/^\s*--(.*)/xi", "", $expression) ;
            return $this->LEX_COMMENT ;
        }
        
        // If a comment on more lines, delete it
//      if(preg_match("/\*.*?\*\// si", $expression, $matches)) {
//          $expression = substr($expression, strlen($matches[0])+2) ;
//          $this->_LEX_INSIDE_COMMENT = true ;
//          return $this->LEX_COMMENT ;
//      }

        // Search for delimiter command
        if(preg_match("/^\s* delimiter \s+ (.+)/xi", $expression, $matches)) {
            $expression = substr($expression, strlen(($matches[0]))) ;
            $this->_LEX_DELIMITER_COMMAND = trim($matches[1]) ;
            
            return $this->LEX_DELIMITER ;
        }
        
        // Start of string
        if(preg_match("/^\s*(\"|\')/xi", $expression, $matches)) {
            $expression = substr($expression, 1) ;
            $this->_LEX_START_STRING = $matches[1] ;
            $this->_LEX_INSIDE_STRING = true ;
            return $this->LEX_STRING ;
        }
    
        // Get the command
        $reg = preg_replace("/\//", "\\/", $this->_LEX_DELIMITER_COMMAND);
        if(preg_match("/.*?(\"|\'|".$reg.")/si", $expression, $matches)) {

            // Get the command
            if($matches[1] == $this->_LEX_DELIMITER_COMMAND) {
                $this->_LEX_BUFFER = substr($matches[0], 0, strlen($matches[0])-strlen($this->_LEX_DELIMITER_COMMAND)) ;
                $expression = substr($expression, strlen($matches[0])) ;
            
                return $this->LEX_COMMAND ;
            } else {
                $this->_LEX_BUFFER = substr($expression, 0, strlen($matches[0]) - 1 ) ;
                $expression = substr($expression, strlen($matches[0]) - 1 ) ;

                return $this->LEX_INIT_COMMAND ;
            }
        }

        return $this->LEX_EOF ;
    }
}

?>

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