/**
* Returns a select query object.
*
* @param string $table_name Name of the main table you're selecting from (= first table in the from clause).
* @param GlueDB_Fragment_Aliased_Table $alias Table alias object you may use to refer to the table columns.
*
* @return GlueDB_Fragment_Query_Select
*/
public static function select($table_name = null, &$alias = null)
{
$f = new GlueDB_Fragment_Query_Select();
if (func_num_args() > 0) {
$args = func_get_args();
return $f->from($table_name, $alias);
} else {
return $f;
}
}
/**
* Compiles GlueDB_Fragment_Query_Select fragments into an SQL string.
*
* @param GlueDB_Fragment_Query_Select $fragment
*
* @return string
*/
public function compile_query_select(GlueDB_Fragment_Query_Select $fragment)
{
// Get data from fragment :
$selectsql = $fragment->get()->sql($this);
$fromsql = $fragment->from()->sql($this);
$wheresql = $fragment->where()->sql($this);
$groupbysql = $fragment->groupby()->sql($this);
$havingsql = $fragment->having()->sql($this);
$orderbysql = $fragment->orderby()->sql($this);
$limit = $fragment->limit();
$offset = $fragment->offset();
// Mandatory :
$sql = 'SELECT ' . (empty($selectsql) ? '*' : $selectsql) . ' FROM ' . $fromsql;
// Optional :
if (!empty($wheresql)) {
$sql .= ' WHERE ' . $wheresql;
}
if (!empty($groupbysql)) {
$sql .= ' GROUP BY ' . $groupbysql;
}
if (!empty($havingsql)) {
$sql .= ' HAVING ' . $havingsql;
}
if (!empty($orderbysql)) {
$sql .= ' ORDER BY ' . $orderbysql;
}
if (isset($limit)) {
$sql .= ' LIMIT ' . $limit;
}
if (isset($offset)) {
$sql .= ' OFFSET ' . $offset;
}
return $sql;
}