<?php
if(!defined('sugarEntry') || !sugarEntry) die('Not A Valid Entry Point');
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 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
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 ********************************************************************************/
/*********************************************************************************

* Description: This file handles the Data base functionality for the application specific
* to oracle database. It is called by the DBManager class to generate various sql statements.
*
* All the functions in this class will work with any bean which implements the meta interface.
* Please refer the DBManager documentation for the details.
*
* Portions created by SugarCRM are Copyright (C) SugarCRM, Inc.
* All Rights Reserved.
* Contributor(s): ______________________________________..
********************************************************************************/
require_once('include/database/DBHelper.php');

class MysqlHelper extends DBHelper
{
    /**
     * @see DBHelper::createTableSQL()
     */
    public function createTableSQL(
        SugarBean $bean
        )
    {
        $tablename = $bean->getTableName();
        $fieldDefs = $bean->getFieldDefinitions();
        $indices   = $bean->getIndices();
        $engine    = $this->getEngine($bean);
        return $this->createTableSQLParams($tablename, $fieldDefs, $indices, $engine);
	}
    
    /**
     * Generates sql for create table statement for a bean.
     *
     * @param  string $tablename
     * @param  array  $fieldDefs
     * @param  array  $indices
     * @param  string $engine optional, MySQL engine to use
     * @return string SQL Create Table statement
    */
    public function createTableSQLParams(
        $tablename, 
        $fieldDefs, 
        $indices, 
        $engine = null
        )
    {		
 		if ( empty($engine) && isset($fieldDefs['engine']))
            $engine = $fieldDefs['engine'];
        if ( !$this->isEngineEnabled($engine) )
            $engine = '';

        $sql = parent::createTableSQLParams($tablename,$fieldDefs,$indices);
        if (!empty($engine))
            $sql.= " ENGINE=$engine"; 

        return $sql;
	}
    
    /**
     * Returns the name of the engine to use or null if we are to use the default
     *
     * @param  object $bean SugarBean instance
     * @return string
     */
    private function getEngine(
        &$bean
        )
    {
        global $dictionary;
        $engine = null;
        if (isset($dictionary[$bean->getObjectName()]['engine'])) {
			$engine = $dictionary[$bean->getObjectName()]['engine'];
		}
        return $engine;
    }
    
    /**
     * Returns true if the engine given is enabled in the backend
     *
     * @param  string $engine
     * @return bool
     */
    private function isEngineEnabled(
        $engine
        )
    {
        $engine = strtoupper($engine);
        
        $r = $this->db->query("SHOW ENGINES");
        
        while ( $row = $this->db->fetchByAssoc($r) )
            if ( strtoupper($row['Engine']) == $engine )
                return ($row['Support']=='YES' || $row['Support']=='DEFAULT');

        return false;
    }
    
    /**
     * @see DBHelper::getColumnType()
     */
    public function getColumnType(
        $type, 
        $name = '', 
        $table = ''
        )
    {
        $map = array( 
            'int'      => 'int',
            'double'   => 'double',
            'float'    => 'float',
            'uint'     => 'int unsigned',
            'ulong'    => 'bigint unsigned',
            'long'     => 'bigint',
            'short'    => 'smallint',
            'varchar'  => 'varchar',
            'text'     => 'text',
            'longtext' => 'longtext',
            'date'     => 'date',
            'enum'     => 'varchar',
            'relate'   => 'varchar',
            'multienum'=> 'text',
            'html'     => 'text',
            'datetime' => 'datetime',
            'time'     => 'time',
            'bool'     => 'bool',
            'tinyint'  => 'tinyint',
            'char'     => 'char',
            'blob'     => 'blob',
            'longblob' => 'longblob',
            'currency' => 'decimal(26,6)',
            'decimal'  => 'decimal',
            'decimal2' => 'decimal',
            'id'       => 'char(36)',
            );
        
        return $map[$type];
    }

    /**
     * @see DBHelper::oneColumnSQLRep()
     */
	protected function oneColumnSQLRep(
        $fieldDef,  
        $ignoreRequired = false, 
        $table = '', 
        $return_as_array = false
        )
    {
        $ref = parent::oneColumnSQLRep($fieldDef, $ignoreRequired, $table, true);
        
        if ( $ref['colType'] == 'int' 
                && !empty($fieldDef['len']) )
            $ref['colType'] .= "(".$fieldDef['len'].")";
        
        // bug 22338 - don't set a default value on text or blob fields
        if ( isset($ref['default']) && 
            ($ref['colType'] == 'text' || $ref['colType'] == 'blob'
                || $ref['colType'] == 'longtext' || $ref['colType'] == 'longblob' ))
            $ref['default'] = '';
            
        if ( $return_as_array )
            return $ref;
        else
            return "{$ref['name']} {$ref['colType']} {$ref['default']} {$ref['required']} {$ref['auto_increment']}";
    }

    /**
     * @see DBHelper::changeColumnSQL()
     */
    protected function changeColumnSQL(
        $tablename, 
        $fieldDefs, 
        $action, 
        $ignoreRequired = false
        )
    {
        if ($this->isFieldArray($fieldDefs))
            foreach ($fieldDefs as $def) 
                $columns[] = $this->oneColumnSQLRep($def, $ignoreRequired);
        else
            $columns[] = $this->oneColumnSQLRep($fieldDefs);

        return "alter table $tablename $action column ".implode(",$action column ", $columns);
    }

    /**
     * @see DBHelper::deleteColumnSQL()
     */
    public function deleteColumnSQL(
        SugarBean $bean, 
        $fieldDefs
        )
    {
        if ($this->isFieldArray($fieldDefs)) 
            foreach ($fieldDefs as $fieldDef) 
                $columns[] = $fieldDef['name'];
        else
            $columns[] = $fieldDefs['name'];

        return "alter table ".$bean->getTableName()." drop column ".implode(", drop column ", $columns);
    }

    /**
     * @see DBHelper::keysSQL
     */
    public function keysSQL( 
        $indices, 
        $alter_table = false, 
        $alter_action = '' 
        )
	{
       // check if the passed value is an array of fields.
       // if not, convert it into an array
       if (!$this->isFieldArray($indices)) 
           $indices[] = $indices;

       $columns = array();
       foreach ($indices as $index) {
           if(!empty($index['db']) && $index['db'] != 'mysql')
               continue;
          
           $type = $index['type'];
           $name = $index['name'];

           if (is_array($index['fields']))
               $fields = implode(", ", $index['fields']);
           else
               $fields = $index['fields'];

           switch ($type) {
           case 'unique':
               $columns[] = " UNIQUE $name ($fields)";
               break;
           case 'primary':
               $columns[] = " PRIMARY KEY ($fields)";
               break;
           case 'index':
           case 'foreign':
           case 'alternate_key':
               /** 
                * @todo here it is assumed that the primary key of the foreign
                * table will always be named 'id'. It must be noted though
                * that this can easily be fixed by referring to db dictionary
                * to find the correct primary field name
                */
               if ( $alter_table )
                   $columns[] = " INDEX $name ($fields)";
               else
                   $columns[] = " KEY $name ($fields)";
               break;
           case 'fulltext':
               if ($this->full_text_indexing_enabled())
                   $columns[] = " FULLTEXT ($fields)";
               else
                   $GLOBALS['log']->debug('MYISAM engine is not available/enabled, full-text indexes will be skipped. Skipping:',$name);
               break;
          }
       }
       $columns = implode(", $alter_action ", $columns);
       if(!empty($alter_action)){
           $columns = $alter_action . ' '. $columns;
       }
       return $columns;
    }

    /**
     * @see DBHelper::setAutoIncrement()
     */
 	protected function setAutoIncrement(
        $table, 
        $field_name
        )
    {
		return "auto_increment";
	}

   	/**
     * @see DBHelper::get_indices()
     */
    public function get_indices(
        $tablename
        ) 
    {
        //find all unique indexes and primary keys.
        $result = $this->db->query("SHOW INDEX FROM $tablename");
        
        $indices = array();
        while (($row=$this->db->fetchByAssoc($result)) !=null) {
            $index_type='index';
            if ($row['Key_name'] =='PRIMARY') {
                $index_type='primary';  
            }
            elseif ( $row['Non_unique'] == '0' ) {
                $index_type='unique';
            }
            $indices[strtolower($row['Key_name'])]['name']=strtolower($row['Key_name']);
            $indices[strtolower($row['Key_name'])]['type']=$index_type;
            $indices[strtolower($row['Key_name'])]['fields'][]=strtolower($row['Column_name']);
        }
        return $indices;
    }

   	/**
     * @see DBHelper::get_columns()
     */
    public function get_columns(
        $tablename
        ) 
    {
        //find all unique indexes and primary keys.
        $result = $this->db->query("DESCRIBE $tablename");
        
        $columns = array();
        while (($row=$this->db->fetchByAssoc($result)) !=null) {
            $columns[strtolower($row['Field'])]['name']=strtolower($row['Field']);
            $matches = array();
            preg_match_all("/(\w+)(?:\(([0-9]+,?[0-9]*)\)|)( unsigned)?/i", $row['Type'], $matches);
            $columns[strtolower($row['Field'])]['type']=strtolower($matches[1][0]);
            if ( isset($matches[2][0]) && in_array(strtolower($matches[1][0]),array('varchar','char','varchar2','int','decimal','float')) )
                $columns[strtolower($row['Field'])]['len']=strtolower($matches[2][0]);
            if ( stristr($row['Extra'],'auto_increment') )
                $columns[strtolower($row['Field'])]['auto_increment'] = '1';
            if ($row['Null'] == 'NO' && !stristr($row['Key'],'PRI'))
                $columns[strtolower($row['Field'])]['required'] = 'true';
            if ( !empty($row['Default']) )
                $columns[strtolower($row['Field'])]['default'] = $row['Default'];
        }
        return $columns;
    }
    
    /**
     * @see DBHelper::add_drop_constraint()
     */
    public function add_drop_constraint(
        $table,
        $definition, 
        $drop = false
        ) 
    {
        $type         = $definition['type'];
        $fields       = implode(',',$definition['fields']);
        $name         = $definition['name'];
        $foreignTable = isset($definition['foreignTable']) ? $definition['foreignTable'] : array();
        $sql          = '';
        
        switch ($type){
        // generic indices
        case 'index':
        case 'alternate_key':
            if ($drop)
                $sql = "DROP INDEX {$name} ";
            else
                $sql = "CREATE INDEX {$name} ON {$table} ({$fields})";
            break;
        // constraints as indices
        case 'unique':
            if ($drop)
                $sql = "ALTER TABLE {$table} DROP INDEX $name";
            else
                $sql = "ALTER TABLE {$table} ADD CONSTRAINT UNIQUE {$name} ({$fields})";
            break;
        case 'primary':
            if ($drop)
                $sql = "ALTER TABLE {$table} DROP PRIMARY KEY";
            else
                $sql = "ALTER TABLE {$table} ADD CONSTRAINT PRIMARY KEY ({$fields})";
            break;
        case 'foreign':
            if ($drop)
                $sql = "ALTER TABLE {$table} DROP FOREIGN KEY ({$fields})";
            else
                $sql = "ALTER TABLE {$table} ADD CONSTRAINT FORIEGN KEY {$name} ({$fields}) REFERENCES {$foreignTable}({$foreignfields})";
            break;
        }
        return $sql;
    }

    /**
     * @see DBHelper::number_of_columns()
     */
    public function number_of_columns(
        $table_name
        ) 
    {
        $result = $this->db->query("DESCRIBE $table_name");

        return ($this->db->getRowCount($result));
    }
	
	/**
     * @see DBHelper::full_text_indexing_enabled()
     */
    protected function full_text_indexing_enabled(
        $dbname = null
        ) 
    {
		return $this->isEngineEnabled('MyISAM');
	}
    
    /**
     * @see DBHelper::massageFieldDef()
     */
    public function massageFieldDef(
        &$fieldDef
        )
    {
        DBHelper::massageFieldDef($fieldDef);
        
        if ( isset($fieldDef['default']) && 
            ($fieldDef['dbType'] == 'text' 
                || $fieldDef['dbType'] == 'blob'
                || $fieldDef['dbType'] == 'longtext' 
                || $fieldDef['dbType'] == 'longblob' ))
            unset($fieldDef['default']);
        if ($fieldDef['dbType'] == 'uint')
            $fieldDef['len'] = '10';
        if ($fieldDef['dbType'] == 'ulong')
            $fieldDef['len'] = '20';
        if ($fieldDef['dbType'] == 'bool')
            $fieldDef['type'] = 'tinyint';
        if ($fieldDef['dbType'] == 'bool' && empty($fieldDef['default']) )
            $fieldDef['default'] = '0';
        if (($fieldDef['dbType'] == 'varchar' || $fieldDef['dbType'] == 'enum') && empty($fieldDef['len']) )
            $fieldDef['len'] = '255';
        if ($fieldDef['dbType'] == 'uint')
            $fieldDef['len'] = '10';
        if ($fieldDef['dbType'] == 'int' && empty($fieldDef['len']) )
            $fieldDef['len'] = '11';
    }
}
?>
