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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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use Soluble\Datatype\Column; |
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use Soluble\Metadata\Reader\Mapping\PdoMysqlMapping; |
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use PDO; |
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class PdoMysqlMetadataReader extends AbstractMetadataReader |
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{ |
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/** |
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* @var PDO |
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*/ |
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protected $pdo; |
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/** |
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* @param PDO $pdo |
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* |
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* @throws Exception\UnsupportedFeatureException |
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* @throws Exception\UnsupportedDriverException |
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*/ |
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public function __construct(PDO $pdo) |
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{ |
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$driver = $pdo->getAttribute(PDO::ATTR_DRIVER_NAME); |
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if (strtolower($driver) !== 'mysql') { |
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throw new Exception\UnsupportedDriverException(__CLASS__ . " supports only pdo_mysql driver, '$driver' given."); |
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} |
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$this->pdo = $pdo; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @throws \Soluble\Metadata\Exception\ConnectionException |
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* @throws \Soluble\Metadata\Exception\EmptyQueryException |
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*/ |
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protected function readColumnsMetadata($sql) |
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{ |
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$metadata = new ColumnsMetadata(); |
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$fields = $this->readFields($sql); |
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$type_map = PdoMysqlMapping::getDatatypeMapping(); |
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foreach ($fields as $idx => $field) { |
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$name = $field['name']; |
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$tableName = $field['table']; |
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$type = strtoupper($field['native_type']); |
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if (!$type_map->offsetExists($type)) { |
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$msg = "Cannot get type for field '$name'. Mapping for native type [$type] cannot be resolved into a valid type for driver: " . __CLASS__; |
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throw new Exception\UnsupportedTypeException($msg); |
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} |
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$datatype = $type_map->offsetGet($type); |
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$column = Column\Type::createColumnDefinition($datatype['type'], $name, $tableName, $schemaName = null); |
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$alias = $field['name']; |
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$column->setAlias($alias); |
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$column->setTableAlias($field['table']); |
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//$column->setCatalog($field->catalog); |
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$column->setOrdinalPosition($idx + 1); |
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$column->setDataType($datatype['type']); |
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$column->setIsNullable(!in_array('not_null', $field['flags'], true)); |
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$column->setIsPrimary(in_array('primary_key', $field['flags'], true)); |
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//$column->setColumnDefault($field->def); |
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$column->setNativeDataType($datatype['native']); |
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/* |
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if ($column instanceof Column\Definition\NumericColumnInterface) { |
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$column->setNumericUnsigned(($field->flags & MYSQLI_UNSIGNED_FLAG) > 0); |
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} |
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if ($column instanceof Column\Definition\IntegerColumn) { |
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$column->setIsAutoIncrement(($field->flags & MYSQLI_AUTO_INCREMENT_FLAG) > 0); |
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} |
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*/ |
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if ($column instanceof Column\Definition\DecimalColumn) { |
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// salary DECIMAL(5,2) |
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// In this example, 5 is the precision and 2 is the scale. |
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// Standard SQL requires that DECIMAL(5,2) be able to store any value |
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// with five digits and two decimals, so values that can be stored in |
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// the salary column range from -999.99 to 999.99. |
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$column->setNumericUnsigned(false); |
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$column->setNumericPrecision($field['precision']); |
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$column->setNumericScale($field['len'] - $field['precision'] + 1); |
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} |
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if ($column instanceof Column\Definition\StringColumn) { |
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$column->setCharacterMaximumLength($field['len']); |
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} |
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if ($column instanceof Column\Definition\BlobColumn) { |
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$column->setCharacterOctetLength($field['len']); |
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} |
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if ($metadata->offsetExists($alias)) { |
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$prev_column = $metadata->offsetGet($alias); |
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$prev_def = $prev_column->toArray(); |
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$curr_def = $column->toArray(); |
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if ($prev_def['dataType'] !== $curr_def['dataType'] || $prev_def['nativeDataType'] !== $curr_def['nativeDataType']) { |
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throw new Exception\AmbiguousColumnException("Cannot get column metadata, non unique column found '$alias' in query with different definitions."); |
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} |
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// If the the previous definition, was a prev_def |
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if ($prev_def['isPrimary']) { |
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$column = $prev_column; |
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} |
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} |
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$metadata->offsetSet($alias, $column); |
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} |
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return $metadata; |
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} |
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/** |
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* Read fields from pdo source. |
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* |
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* @throws Exception\ConnectionException |
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* |
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* @param string $sql |
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* |
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* @return array |
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* |
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* @throws \Soluble\Metadata\Exception\EmptyQueryException |
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*/ |
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protected function readFields($sql) |
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{ |
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if (trim($sql) === '') { |
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throw new Exception\EmptyQueryException('Cannot read fields for an empty query'); |
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} |
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$sql = $this->getEmptiedQuery($sql); |
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$stmt = $this->pdo->prepare($sql); |
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$stmt->execute(); |
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$column_count = $stmt->columnCount(); |
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$metaFields = []; |
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for ($i = 0; $i < $column_count; ++$i) { |
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$meta = $stmt->getColumnMeta($i); |
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$metaFields[$i] = $meta; |
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} |
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$stmt->closeCursor(); |
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unset($stmt); |
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return $metaFields; |
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} |
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} |
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belgattitude /
soluble-metadata
