/**
* Create the SQL of a function expression
* @param zibo\library\database\manipulation\expression\FunctionExpression $function
* @return string SQL of the function expression
*/
protected function parseFunctionExpression(FunctionExpression $function)
{
$sql = $function->getName() . '(';
if ($function->isDistinct()) {
$sql .= 'DISTINCT ';
}
$arguments = $function->getArguments();
if ($arguments) {
$argumentSql = '';
foreach ($arguments as $expression) {
$argumentSql .= ($argumentSql ? ', ' : '') . $this->parseExpression($expression);
}
$sql .= $argumentSql;
}
return $sql . ')';
}
/**
* Processes the relations and the localization of the arguments used in a function expression
* @param zibo\library\database\manipulation\expression\FunctionExpression $expression Function expression to process
* @param boolean $inCondition Flag to see whether this expression is used in a condition or else where
* @return zibo\library\database\manipulation\expression\FunctionExpression Processed function expression
*/
private function processFunctionExpression(FunctionExpression $expression, $inCondition)
{
$function = new FunctionExpression($expression->getName(), $expression->getAlias());
$function->setDistinct($expression->isDistinct());
$arguments = $expression->getArguments();
foreach ($arguments as $argument) {
$argument = $this->processExpression($argument, $inCondition);
$function->addArgument($argument);
}
return $function;
}