Method has_sequence

lib/sqlalchemy/dialects/mysql/base.py:3101–3125

(
        self,
        connection: Connection,
        sequence_name: str,
        schema: Optional[str] = None,
        **kw: Any,
    )

    @reflection.cache
    def has_sequence(
        self,
        connection: Connection,
        sequence_name: str,
        schema: Optional[str] = None,
        **kw: Any,
    ) -> bool:
        if not self.supports_sequences:
            self._sequences_not_supported()
        if not schema:
            schema = self.default_schema_name
        # MariaDB implements sequences as a special type of table
        #
        cursor = connection.execute(
            sql.text(
                "SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES "
                "WHERE TABLE_TYPE='SEQUENCE' and TABLE_NAME=:name AND "
                "TABLE_SCHEMA=:schema_name"
            ),
            dict(
                name=str(sequence_name),
                schema_name=str(schema),
            ),
        )
        return cursor.first() is not None

    def _sequences_not_supported(self) -> NoReturn:
        raise NotImplementedError(