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<?php |
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class trait_query |
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{ |
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/** Adds conditions, orderBy and Limits to query. |
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* @todo Separate query in dedicated class or trait |
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* @param string $query |
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* @param mixed $cond |
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* @param array $order |
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* @param mixed $limit -> 5 or [$start, $count] |
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* @param bool $useHaving sflag - to use HAVING instead of WHERE |
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* @return string */ |
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protected static function query( |
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$query, |
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$cond = null, |
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array $order = [], |
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$limit = 0, |
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$useHaving = false |
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) |
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{ |
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//Condition: '' | ' (HAVING|WHERE|AND) ' . $cond |
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self::queryConditions($query, $cond, $useHaving); |
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//Order: '' | 'ORDER BY ' . array_keys($order)[0] . ' ' . $order[0] |
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self::queryOrder($query, $order); |
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//Limit: '' | ' LIMIT ' . '(20, 40|20)' |
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self::queryLimit($query, $limit); |
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return $query; |
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} |
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private static function queryConditions(&$query, $cond, $useHaving) |
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{ |
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if (!empty($cond)) { |
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$clause = !$useHaving ? 'WHERE' : 'HAVING'; |
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$clue = !strpos($query, $clause) ? $clause : 'AND'; |
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$query .= (' ' . $clue . ' ' . $cond); |
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} |
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} |
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private static function queryOrder(&$query, $order) |
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{ |
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if (!empty($order)) { |
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$arr = array_map(function (&$value, $key) { |
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return $key . ' ' . strtoupper($value); |
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}, $order, array_keys($order)); |
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$query .= (' ORDER BY ' . implode(', ', $arr)); |
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} |
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} |
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private static function queryLimit(&$query, $limit) |
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{ |
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if (!empty($limit)) { |
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$value = (is_array($limit) ? implode(', ', $limit) : $limit); |
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$query .= (' LIMIT ' . $value); |
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} |
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} |
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} |
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