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120 lines
4.1 KiB
120 lines
4.1 KiB
'''
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Class for loading table type data. please refer to Pandas-Input/Output for file format details.
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'''
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import os
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import glob
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import pandas as pd
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from sqlalchemy import create_engine
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from colossalqa.utils import drop_table
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from colossalqa.mylogging import get_logger
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logger = get_logger()
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SUPPORTED_DATA_FORMAT = ['.csv','.xlsx', '.xls','.json','.html','.h5', '.hdf5','.parquet','.feather','.dta']
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class TableLoader:
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'''
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Load tables from different files and serve a sql database for database operations
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'''
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def __init__(self, files: str,
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sql_path:str='sqlite:///mydatabase.db',
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verbose=False, **kwargs) -> None:
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'''
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Args:
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files: list of files (list[file path, name])
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sql_path: how to serve the sql database
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**kwargs: keyword type arguments, useful for certain document types
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'''
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self.data = {}
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self.verbose = verbose
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self.sql_path = sql_path
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self.kwargs = kwargs
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self.sql_engine = create_engine(self.sql_path)
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drop_table(self.sql_engine)
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self.sql_engine = create_engine(self.sql_path)
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for item in files:
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path = item[0]
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dataset_name = item[1]
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if not os.path.exists(path):
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raise FileNotFoundError(f"{path} doesn't exists")
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if not any([path.endswith(i) for i in SUPPORTED_DATA_FORMAT]):
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raise TypeError(f"{path} not supported. Supported type {SUPPORTED_DATA_FORMAT}")
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logger.info("loading data", verbose=self.verbose)
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self.load_data(path)
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logger.info("data loaded", verbose=self.verbose)
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self.to_sql(path, dataset_name)
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def load_data(self, path):
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'''
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Load data and serve the data as sql database.
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Data must be in pandas format
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'''
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files = []
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# Handle glob expression
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try:
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files = glob.glob(path)
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except Exception as e:
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logger.error(e)
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if len(files)==0:
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raise ValueError("Unsupported file/directory format. For directories, please use glob expression")
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elif len(files)==1:
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path = files[0]
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else:
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for file in files:
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self.load_data(file)
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if path.endswith('.csv'):
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# Load csv
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self.data[path] = pd.read_csv(path)
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elif path.endswith('.xlsx') or path.endswith('.xls'):
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# Load excel
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self.data[path] = pd.read_excel(path) # You can adjust the sheet_name as needed
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elif path.endswith('.json'):
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# Load json
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self.data[path] = pd.read_json(path)
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elif path.endswith('.html'):
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# Load html
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html_tables = pd.read_html(path)
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# Choose the desired table from the list of DataFrame objects
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self.data[path] = html_tables[0] # You may need to adjust this index
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elif path.endswith('.h5') or path.endswith('.hdf5'):
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# Load h5
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self.data[path] = pd.read_hdf(path, key=self.kwargs.get('key', 'data')) # You can adjust the key as needed
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elif path.endswith('.parquet'):
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# Load parquet
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self.data[path] = pd.read_parquet(path, engine='fastparquet')
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elif path.endswith('.feather'):
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# Load feather
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self.data[path] = pd.read_feather(path)
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elif path.endswith('.dta'):
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# Load dta
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self.data[path] = pd.read_stata(path)
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else:
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raise ValueError("Unsupported file format")
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def to_sql(self, path, table_name):
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'''
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Serve the data as sql database.
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'''
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self.data[path].to_sql(table_name, con=self.sql_engine, if_exists='replace', index=False)
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logger.info(f"Loaded to Sqlite3\nPath: {path}", verbose=self.verbose)
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return self.sql_path
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def get_sql_path(self):
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return self.sql_path
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def __del__(self):
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if self.sql_engine:
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drop_table(self.sql_engine)
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self.sql_engine.dispose()
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del self.data
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del self.sql_engine
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