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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\Metadata\Reader\Mapping\MysqliMapping; |
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use Soluble\Datatype\Column; |
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class MysqliMetadataReader extends AbstractMetadataReader |
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{ |
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/** |
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* @var \Mysqli |
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*/ |
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protected $mysqli; |
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/** |
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* @var array |
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*/ |
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protected static $metadata_cache = []; |
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/** |
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* @param \Mysqli $mysqli |
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*/ |
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public function __construct(\Mysqli $mysqli) |
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{ |
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$this->mysqli = $mysqli; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @throws \Soluble\Metadata\Exception\ConnectionException |
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* @throws \Soluble\Metadata\Exception\EmptyQueryException |
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* @throws \Soluble\Metadata\Exception\InvalidQueryException |
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*/ |
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protected function readColumnsMetadata($sql) |
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{ |
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$metadata = new ColumnsMetadata(); |
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$fields = $this->readFields($sql); |
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$type_map = MysqliMapping::getDatatypeMapping(); |
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foreach ($fields as $idx => $field) { |
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$name = $field->orgname === '' ? $field->name : $field->orgname; |
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$tableName = $field->orgtable; |
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$schemaName = $field->db; |
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$type = $field->type; |
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if (!$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, $schemaName); |
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$column->setAlias($field->name); |
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$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(!($field->flags & MYSQLI_NOT_NULL_FLAG) > 0 && ($field->orgtable !== '' || $field->orgtable !== null)); |
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$column->setIsPrimary(($field->flags & MYSQLI_PRI_KEY_FLAG) > 0); |
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$column->setColumnDefault($field->def); |
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if (($field->flags & MYSQLI_SET_FLAG) > 0) { |
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$column->setNativeDataType('SET'); |
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} elseif (($field->flags & MYSQLI_ENUM_FLAG) > 0) { |
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$column->setNativeDataType('ENUM'); |
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} else { |
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$column->setNativeDataType($datatype['native']); |
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} |
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if ($field->table === '' || $field->table === null) { |
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$column->setIsGroup(($field->flags & MYSQLI_GROUP_FLAG) > 0); |
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} |
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if ($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(($field->flags & MYSQLI_AUTO_INCREMENT_FLAG) > 0); |
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} elseif ($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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$column->setNumericScale($field->length - $field->decimals + 1); |
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$column->setNumericPrecision($field->decimals); |
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} |
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if ($column instanceof Column\Definition\StringColumn) { |
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$column->setCharacterMaximumLength($field->length); |
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} |
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if ($column instanceof Column\Definition\BlobColumn) { |
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$column->setCharacterOctetLength($field->length); |
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} |
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$alias = $column->getAlias(); |
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if ($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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/* |
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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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* @param string $sql |
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* |
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* @throws Exception\ConnectionException |
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* |
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* @return array |
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* |
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* @throws \Soluble\Metadata\Exception\EmptyQueryException |
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* @throws \Soluble\Metadata\Exception\InvalidQueryException |
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*/ |
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protected function readFields($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 = $this->mysqli->prepare($sql); |
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if (!$stmt) { |
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$message = $this->mysqli->error; |
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throw new Exception\InvalidQueryException( |
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sprintf('Invalid query: %s (%s)', $sql, $message) |
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); |
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} |
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$stmt->execute(); |
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$result = $stmt->result_metadata(); |
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$metaFields = $result->fetch_fields(); |
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$result->close(); |
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$stmt->close(); |
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return $metaFields; |
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} |
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} |
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belgattitude /
soluble-metadata
