TypeError: dict is not a sequence

Hi

I am trying to load data into a PostGIS table. For this purpose, I
have the following function I tried to cough up analogously to
https://www.psycopg.org/docs/usage.html#passing-parameters-to-sql-queries.

def process_files(data_directory, file_name_regexp, conn, source_id, logger):
loaded_files =
get_loaded_files(conn=conn,source_id=source_id,logger=logger,)
existing_hashes = {file_hash for file_hash, _ in loaded_files}

# "next" inhibits recursion, so only the top level is retrieved
logger.info(f"Looking into '{data_directory}'")
try:
cur = conn.cursor()
cur.execute("set postgis.gdal_enabled_drivers = 'ENABLE_ALL';")
root, dirs, files = next(os.walk(data_directory))
for file_name in files:
if re.match(file_name_regexp, file_name):
file_path = os.path.join(root, file_name)
logger.info(f"Processing '{file_path}'")
file_hash = calculate_file_sha3_512_hash(file_path)
file_creation_time =
datetime.fromtimestamp(os.path.getctime(file_path))

# If the hash is alread present, skip this file FIXME
check on file names
if file_hash in existing_hashes:
continue

# Get the raster data
with open(file_path, 'rb') as f:
raster_data = f.read()

statement = """merge
into
TOPO_FILES as TARGET
using
( values
(
-- ST_FromGDALRaster(pg_read_binary_file(%s)),
ST_FromGDALRaster(%(TILE)s::bytea),
%(FILE_NAME)s,
%(FILE_CREATION_PIT)s,
%(FILE_HASH)s,
%(SOURCE_ID)s::uuid
)
) as source ( TILE, FILE_NAME, FILE_CREATION_PIT, FILE_HASH, SOURCE_ID )
on
TARGET.FILE_NAME = SOURCE.FILE_NAME
and TARGET.SOURCE_ID = SOURCE.SOURCE_ID
and TARGET.FILE_HASH != SOURCE.FILE_HASH
and TARGET.FILE_CREATION_PIT < SOURCE.FILE_CREATION_PIT
when matched
then
update
set
TILE = SOURCE.TILE,
FILE_NAME = SOURCE.FILE_NAME,
FILE_CREATION_PIT = SOURCE.FILE_CREATION_PIT,
FILE_HASH = SOURCE.FILE_HASH,
SOURCE_ID = SOURCE.SOURCE_ID
when not matched
then
insert
(
TILE,
FILE_NAME,
FILE_CREATION_PIT,
FILE_HASH,
SOURCE_ID
)
values
(
SOURCE.TILE,
SOURCE.FILE_NAME,
SOURCE.FILE_CREATION_PIT,
SOURCE.FILE_HASH,
SOURCE.SOURCE_ID
);"""
logger.debug("statement")
logger.debug(statement)
logger.debug("First 100 bytes of raster_data")
logger.debug(f"{raster_data[:100]}")
logger.debug(f"file_name:{file_name}")
logger.debug(f"file_creation_time:{file_creation_time}")
logger.debug(f"file_hash:{file_hash}")
logger.debug(f"source_id:{source_id}")
# params = (psycopg2.Binary(raster_data), file_name,
file_creation_time, file_hash, source_id)
params = {'TILE': raster_data
,'FILE_NAME': file_name
,'FILE_CREATION_PIT': file_creation_time
,'FILE_HASH': file_hash
,'SOURCE_ID': source_id}
# logger.debug(f"params:{params}")
cur.execute(statement, params)
conn.commit()
cur.close()
except StopIteration:
logger.error(f"Error: '{data_directory}' could not be walked.
Directory might be empty or inaccessible.")

However, I get the mentioned error.

2024-11-01 11:06:58 - root - DEBUG -
source_id:4f68d890-a08c-4c06-8aa5-741ad36b6abe
Traceback (most recent call last):
File
"/home/thiemo/external_projects/svn/33/trunk/code_files/data_storage/load_OpenTopography_data.py", line 737, in
<module>
main()
File
"/home/thiemo/external_projects/svn/33/trunk/code_files/data_storage/load_OpenTopography_data.py", line 714, in
main
process_files(
File
"/home/thiemo/external_projects/svn/33/trunk/code_files/data_storage/load_OpenTopography_data.py", line 442, in
process_files
cur.execute(statement, params)
TypeError: dict is not a sequence

I would very much appreciate, if someone shed some light on the matter.

Kind regards

Thiemo