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File: Sql_Compiler/Sql_CompilerDelete.class.php


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  Classes of Tom Schaefer  >  SQL Parse and Compile  >  Sql_Compiler/Sql_CompilerDelete.class.php  
File: Sql_Compiler/Sql_CompilerDelete.class.php
Role: Class source
Content type: text/plain
Description: compile delete statement
Class: SQL Parse and Compile
Parse and compose SQL queries programatically
 

Contents

Class file image Download
<?php

/**
 *
 * Sql_CompilerDelete
 * @package Sql_Compiler
 * @author Thomas Schäfer
 * @since 03.12.2008 07:49:30
 * @desc compiles sql delete statements into string
 */
/**
 *
 * Sql_CompilerDelete
 * @package Sql_Compiler
 * @author Thomas Schäfer
 * @since 03.12.2008 07:49:30
 * @desc compiles sql delete statements into string
 */
class Sql_CompilerDelete implements Sql_InterfaceCompiler
{

    /**
     * compile delete
     *     
     * @desc build an delete statement string
     * @access private
     * @param string $type
     * @return string
     */
    public static function doCompile() 
    {
        $sql     = Sql_Compiler::SQL_DELETE 
                . Sql_Compiler::SPACE 
                . Sql_Compiler::SQL_FROM
                . Sql_Compiler::SPACE 
                . implode(Sql_Compiler::COMMA . Sql_Compiler::SPACE, Sql_Object :: get('tree.TableNames') );

        // save the where clause
        if (Sql_Object :: has('tree.Where')) {
            
            $search_string = Sql_Compiler::compileSearchClause (Sql_Object :: get('tree.Where'));
            
            if (Sql_Compiler::isError($search_string)) {
                return $search_string;
            }
            $sql     .= Sql_Compiler::SPACE
                    . Sql_Compiler::SQL_WHERE
                    . Sql_Compiler::SPACE
                    . $search_string;
        }
        return $sql;
        
    }
    
    public static function compile( $tree )
    {
        Sql_Object::set("tree", $tree);
        return self::doCompile();
    }

}


 
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