<?php
/**
*
* Sql_CompilerUpdate
* @package Sql_Compiler
* @author Thomas Schäfer
* @since 03.12.2008 07:49:30
* @desc compiles sql update statements into string
*/
/**
*
* Sql_CompilerUpdate
* @package Sql_Compiler
* @author Thomas Schäfer
* @since 03.12.2008 07:49:30
* @desc compiles sql update statements into string
*/
class Sql_CompilerUpdate implements Sql_InterfaceCompiler
{
/**
* compile insert
*
* @desc build an insert statement string
* @access private
* @param string $type
* @return string
*/
public static function doCompile()
{
$sql = Sql_Compiler::SQL_UPDATE
. Sql_Compiler::SPACE;
if(Sql_Object :: has('tree.Statement')) {
$sql .= implode(Sql_Compiler::SPACE, Sql_Object :: get('tree.Statement')) . Sql_Compiler::SPACE;
}
$sql .= implode(Sql_Compiler::COMMA . Sql_Compiler::SPACE, Sql_Object :: get('tree.TableNames'));
// save the set clause
for ($i = 0; $i < count (Sql_Object :: get('tree.ColumnNames')); $i++) {
$set_columns[] = Sql_Object :: get('tree.ColumnNames.'.$i)
. ' = '
. Sql_Compiler::getWhereValue(Sql_Object :: get('tree.Values.'.$i));
}
// set
$sql .= Sql_Compiler::SPACE
. Sql_Compiler::SQL_SET
. Sql_Compiler::SPACE
. implode (Sql_Compiler::COMMA . Sql_Compiler::SPACE, $set_columns);
// 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;
} else {
return Sql_Compiler::raiseError("UPDATE without condition.");
}
return $sql;
}
public static function compile( $tree )
{
Sql_Object::set("tree", $tree);
return self::doCompile();
}
}
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