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<?php |
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namespace Soluble\Metadata\Reader; |
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use Soluble\Metadata\ColumnsMetadata; |
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use Soluble\Metadata\Exception; |
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abstract class AbstractMetadataReader |
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{ |
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/** |
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* Keep static cache in memory |
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* @var boolean |
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*/ |
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protected $cache_active = true; |
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/** |
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* |
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* @param boolean $active |
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* @return AbstractMetadataReader |
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*/ |
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public function setStaticCache($active = true) |
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{ |
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$this->cache_active = $active; |
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return $this; |
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} |
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/** |
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* Return columns metadata from query |
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* |
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* @throws UnsupportedDatatypeException |
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* @throws Exception\AmbiguousColumnException |
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* |
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* @param string $sql |
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* @return ColumnsMetadata |
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*/ |
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public function getColumnsMetadata($sql) |
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{ |
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if ($this->cache_active) { |
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$cache_key = md5($sql); |
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if (!array_key_exists($cache_key, static::$metadata_cache)) { |
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$md = $this->readColumnsMetadata($sql); |
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static::$metadata_cache[$cache_key] = $md; |
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} |
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return static::$metadata_cache[$cache_key]; |
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} else { |
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return $this->readColumnsMetadata($sql); |
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} |
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} |
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/** |
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* Read metadata information from source |
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* |
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* @throws Exception\UnsupportedTypeException |
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* @throws Exception\AmbiguousColumnException |
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* |
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* @param string $sql |
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* @return ColumnsMetadata |
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*/ |
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abstract protected function readColumnsMetadata($sql); |
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/** |
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* Optimization, will add false condition to the query |
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* so the metadata loading will be faster |
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* |
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* @param string $sql query string |
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* @return string |
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*/ |
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protected function getEmptiedQuery($sql) |
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{ |
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// see the reason why in Vision_Store_Adapter_ZendDbSelect::getMetatData |
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//$sql = str_replace("('__innerselect'='__innerselect')", '(1=0)', $sql); |
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$sql = preg_replace('/(\r\n|\r|\n|\t)+/', " ", strtolower($sql)); |
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$sql = trim($sql); |
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$sql = preg_replace('/\s+/', ' ', $sql); |
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$replace_regexp = "LIMIT[\s]+[\d]+((\s*,\s*\d+)|(\s+OFFSET\s+\d+)){0,1}"; |
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$search_regexp = "$replace_regexp"; |
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if (!preg_match("/$search_regexp/i", $sql)) { |
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// Limit is not already present |
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$sql .= " LIMIT 0"; |
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} else { |
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// replace first if offset exists, then if not |
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//preg_match_all("/($search_regexp)/i", $sql, $matches, PREG_PATTERN_ORDER); |
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//var_dump($matches); |
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$sql = preg_replace("/($replace_regexp)/i", "LIMIT 0", $sql); |
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} |
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return $sql; |
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} |
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} |
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belgattitude /
soluble-metadata
