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run.py
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import codecs
import csv
import operator
import os.path
import re
from functools import reduce
from io import StringIO
import html
import prettytable
import sqlalchemy
import sqlparse
from sql.connection import Connection
from sql import exceptions
from .column_guesser import ColumnGuesserMixin
try:
from pgspecial.main import PGSpecial
except ModuleNotFoundError:
PGSpecial = None
from sqlalchemy.orm import Session
from sql.telemetry import telemetry
import logging
import warnings
from collections.abc import Iterable
def unduplicate_field_names(field_names):
"""Append a number to duplicate field names to make them unique."""
res = []
for k in field_names:
if k in res:
i = 1
while k + "_" + str(i) in res:
i += 1
k += "_" + str(i)
res.append(k)
return res
class UnicodeWriter(object):
"""
A CSV writer which will write rows to CSV file "f",
which is encoded in the given encoding.
"""
def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
# Redirect output to a queue
self.queue = StringIO()
self.writer = csv.writer(self.queue, dialect=dialect, **kwds)
self.stream = f
self.encoder = codecs.getincrementalencoder(encoding)()
def writerow(self, row):
_row = row
self.writer.writerow(_row)
# Fetch UTF-8 output from the queue ...
data = self.queue.getvalue()
# write to the target stream
self.stream.write(data)
# empty queue
self.queue.truncate(0)
self.queue.seek(0)
def writerows(self, rows):
for row in rows:
self.writerow(row)
class CsvResultDescriptor(object):
"""
Provides IPython Notebook-friendly output for the
feedback after a ``.csv`` called.
"""
def __init__(self, file_path):
self.file_path = file_path
def __repr__(self):
return "CSV results at %s" % os.path.join(os.path.abspath("."), self.file_path)
def _repr_html_(self):
return '<a href="%s">CSV results</a>' % os.path.join(
".", "files", self.file_path
)
def _nonbreaking_spaces(match_obj):
"""
Make spaces visible in HTML by replacing all `` `` with `` ``
Call with a ``re`` match object. Retain group 1, replace group 2
with nonbreaking speaces.
"""
spaces = " " * len(match_obj.group(2))
return "%s%s" % (match_obj.group(1), spaces)
_cell_with_spaces_pattern = re.compile(r"(<td>)( {2,})")
class ResultSet(ColumnGuesserMixin):
"""
Results of a SQL query.
Can access rows listwise, or by string value of leftmost column.
"""
def __init__(self, sqlaproxy, config):
self.config = config
self.keys = {}
self._results = []
# https://peps.python.org/pep-0249/#description
is_dbapi_results = hasattr(sqlaproxy, "description")
self.pretty = None
if is_dbapi_results:
should_try_fetch_results = True
else:
should_try_fetch_results = sqlaproxy.returns_rows
if should_try_fetch_results:
# sql alchemy results
if not is_dbapi_results:
self.keys = sqlaproxy.keys()
elif isinstance(sqlaproxy.description, Iterable):
self.keys = [i[0] for i in sqlaproxy.description]
else:
self.keys = []
if len(self.keys) > 0:
if isinstance(config.autolimit, int) and config.autolimit > 0:
self._results = sqlaproxy.fetchmany(size=config.autolimit)
else:
self._results = sqlaproxy.fetchall()
self.field_names = unduplicate_field_names(self.keys)
_style = None
if isinstance(config.style, str):
_style = prettytable.__dict__[config.style.upper()]
self.pretty = PrettyTable(self.field_names, style=_style)
def _repr_html_(self):
_cell_with_spaces_pattern = re.compile(r"(<td>)( {2,})")
if self.pretty:
self.pretty.add_rows(self)
result = self.pretty.get_html_string()
# to create clickable links
result = html.unescape(result)
result = _cell_with_spaces_pattern.sub(_nonbreaking_spaces, result)
if self.config.displaylimit and len(self) > self.config.displaylimit:
HTML = (
'%s\n<span style="font-style:italic;text-align:center;">'
"%d rows, truncated to displaylimit of %d</span>"
)
result = HTML % (result, len(self), self.config.displaylimit)
return result
else:
return None
def __len__(self):
return len(self._results)
def __iter__(self):
for result in self._results:
yield result
def __str__(self, *arg, **kwarg):
self.pretty.add_rows(self)
return str(self.pretty or "")
def __repr__(self) -> str:
return str(self)
def __eq__(self, another: object) -> bool:
return self._results == another
def __getitem__(self, key):
"""
Access by integer (row position within result set)
or by string (value of leftmost column)
"""
try:
return self._results[key]
except TypeError:
result = [row for row in self if row[0] == key]
if not result:
raise KeyError(key)
if len(result) > 1:
raise KeyError('%d results for "%s"' % (len(result), key))
return result[0]
def dict(self):
"""Returns a single dict built from the result set
Keys are column names; values are a tuple"""
return dict(zip(self.keys, zip(*self)))
def dicts(self):
"Iterator yielding a dict for each row"
for row in self:
yield dict(zip(self.keys, row))
@telemetry.log_call("data-frame", payload=True)
def DataFrame(self, payload):
"Returns a Pandas DataFrame instance built from the result set."
import pandas as pd
frame = pd.DataFrame(self, columns=(self and self.keys) or [])
payload[
"connection_info"
] = Connection.current._get_curr_sqlalchemy_connection_info()
return frame
@telemetry.log_call("polars-data-frame")
def PolarsDataFrame(self, **polars_dataframe_kwargs):
"Returns a Polars DataFrame instance built from the result set."
import polars as pl
frame = pl.DataFrame(
(tuple(row) for row in self), schema=self.keys, **polars_dataframe_kwargs
)
return frame
@telemetry.log_call("pie")
def pie(self, key_word_sep=" ", title=None, **kwargs):
"""Generates a pylab pie chart from the result set.
``matplotlib`` must be installed, and in an
IPython Notebook, inlining must be on::
%%matplotlib inline
Values (pie slice sizes) are taken from the
rightmost column (numerical values required).
All other columns are used to label the pie slices.
Parameters
----------
key_word_sep: string used to separate column values
from each other in pie labels
title: Plot title, defaults to name of value column
Any additional keyword arguments will be passsed
through to ``matplotlib.pylab.pie``.
"""
self.guess_pie_columns(xlabel_sep=key_word_sep)
import matplotlib.pylab as plt
ax = plt.gca()
ax.pie(self.ys[0], labels=self.xlabels, **kwargs)
ax.set_title(title or self.ys[0].name)
return ax
@telemetry.log_call("plot")
def plot(self, title=None, **kwargs):
"""Generates a pylab plot from the result set.
``matplotlib`` must be installed, and in an
IPython Notebook, inlining must be on::
%%matplotlib inline
The first and last columns are taken as the X and Y
values. Any columns between are ignored.
Parameters
----------
title: Plot title, defaults to names of Y value columns
Any additional keyword arguments will be passsed
through to ``matplotlib.pylab.plot``.
"""
import matplotlib.pylab as plt
self.guess_plot_columns()
self.x = self.x or range(len(self.ys[0]))
ax = plt.gca()
coords = reduce(operator.add, [(self.x, y) for y in self.ys])
ax.plot(*coords, **kwargs)
if hasattr(self.x, "name"):
ax.set_xlabel(self.x.name)
ylabel = ", ".join(y.name for y in self.ys)
ax.set_title(title or ylabel)
ax.set_ylabel(ylabel)
return ax
@telemetry.log_call("bar")
def bar(self, key_word_sep=" ", title=None, **kwargs):
"""Generates a pylab bar plot from the result set.
``matplotlib`` must be installed, and in an
IPython Notebook, inlining must be on::
%%matplotlib inline
The last quantitative column is taken as the Y values;
all other columns are combined to label the X axis.
Parameters
----------
title: Plot title, defaults to names of Y value columns
key_word_sep: string used to separate column values
from each other in labels
Any additional keyword arguments will be passsed
through to ``matplotlib.pylab.bar``.
"""
import matplotlib.pylab as plt
ax = plt.gca()
self.guess_pie_columns(xlabel_sep=key_word_sep)
ax.bar(range(len(self.ys[0])), self.ys[0], **kwargs)
if self.xlabels:
ax.set_xticks(range(len(self.xlabels)), self.xlabels, rotation=45)
ax.set_xlabel(self.xlabel)
ax.set_ylabel(self.ys[0].name)
return ax
@telemetry.log_call("generate-csv")
def csv(self, filename=None, **format_params):
"""Generate results in comma-separated form. Write to ``filename`` if given.
Any other parameters will be passed on to csv.writer."""
if not self.pretty:
return None # no results
self.pretty.add_rows(self)
if filename:
encoding = format_params.get("encoding", "utf-8")
outfile = open(filename, "w", newline="", encoding=encoding)
else:
outfile = StringIO()
writer = UnicodeWriter(outfile, **format_params)
writer.writerow(self.field_names)
for row in self:
writer.writerow(row)
if filename:
outfile.close()
return CsvResultDescriptor(filename)
else:
return outfile.getvalue()
def interpret_rowcount(rowcount):
if rowcount < 0:
result = "Done."
else:
result = "%d rows affected." % rowcount
return result
class FakeResultProxy(object):
"""A fake class that pretends to behave like the ResultProxy from
SqlAlchemy.
"""
def __init__(self, cursor, headers):
if cursor is None:
cursor = []
headers = []
if isinstance(cursor, list):
self.from_list(source_list=cursor)
else:
self.fetchall = cursor.fetchall
self.fetchmany = cursor.fetchmany
self.rowcount = cursor.rowcount
self.keys = lambda: headers
self.returns_rows = True
def from_list(self, source_list):
"Simulates SQLA ResultProxy from a list."
self.fetchall = lambda: source_list
self.rowcount = len(source_list)
def fetchmany(size):
pos = 0
while pos < len(source_list):
yield source_list[pos : pos + size]
pos += size
self.fetchmany = fetchmany
# some dialects have autocommit
# specific dialects break when commit is used:
_COMMIT_BLACKLIST_DIALECTS = (
"athena",
"bigquery",
"clickhouse",
"ingres",
"mssql",
"teradata",
"vertica",
)
def _commit(conn, config, manual_commit):
"""Issues a commit, if appropriate for current config and dialect"""
_should_commit = (
config.autocommit
and all(
dialect not in str(conn.dialect) for dialect in _COMMIT_BLACKLIST_DIALECTS
)
and manual_commit
)
if _should_commit:
try:
with Session(conn.session) as session:
session.commit()
except sqlalchemy.exc.OperationalError:
print("The database does not support the COMMIT command")
def is_postgres_or_redshift(dialect):
"""Checks if dialect is postgres or redshift"""
return "postgres" in str(dialect) or "redshift" in str(dialect)
def is_pytds(dialect):
"""Checks if driver is pytds"""
return "pytds" in str(dialect)
def handle_postgres_special(conn, statement):
"""Execute a PostgreSQL special statement using PGSpecial module."""
if not PGSpecial:
raise exceptions.MissingPackageError("pgspecial not installed")
pgspecial = PGSpecial()
_, cur, headers, _ = pgspecial.execute(conn.session.connection.cursor(), statement)[
0
]
return FakeResultProxy(cur, headers)
def set_autocommit(conn, config):
"""Sets the autocommit setting for a database connection."""
if is_pytds(conn.dialect):
warnings.warn(
"Autocommit is not supported for pytds, thus is automatically disabled"
)
return False
if config.autocommit:
try:
conn.session.execution_options(isolation_level="AUTOCOMMIT")
except Exception as e:
logging.debug(
f"The database driver doesn't support such "
f"AUTOCOMMIT execution option"
f"\nPerhaps you can try running a manual COMMIT command"
f"\nMessage from the database driver\n\t"
f"Exception: {e}\n", # noqa: F841
)
return True
return False
def select_df_type(resultset, config):
"""
Converts the input resultset to either a Pandas DataFrame
or Polars DataFrame based on the config settings.
"""
if config.autopandas:
return resultset.DataFrame()
elif config.autopolars:
return resultset.PolarsDataFrame(**config.polars_dataframe_kwargs)
else:
return resultset
# returning only last result, intentionally
def run(conn, sql, config):
"""Run a SQL query with the given connection
Parameters
----------
conn : sql.connection.Connection
The connection to use
sql : str
SQL query to execution
config
Configuration object
"""
info = conn._get_curr_sqlalchemy_connection_info()
duckdb_autopandas = info and info.get("dialect") == "duckdb" and config.autopandas
if not sql.strip():
# returning only when sql is empty string
return "Connected: %s" % conn.name
for statement in sqlparse.split(sql):
first_word = sql.strip().split()[0].lower()
manual_commit = False
# attempting to run a transaction
if first_word == "begin":
raise exceptions.RuntimeError("JupySQL does not support transactions")
# postgres metacommand
if first_word.startswith("\\") and is_postgres_or_redshift(conn.dialect):
result = handle_postgres_special(conn, statement)
# regular query
else:
manual_commit = set_autocommit(conn, config)
is_custom_connection = Connection.is_custom_connection(conn)
# if regular sqlalchemy, pass a text object
if not is_custom_connection:
statement = sqlalchemy.sql.text(statement)
if duckdb_autopandas:
conn = conn.engine.raw_connection()
cursor = conn.cursor()
cursor.execute(str(statement))
else:
result = conn.session.execute(statement)
_commit(conn=conn, config=config, manual_commit=manual_commit)
if result and config.feedback:
if hasattr(result, "rowcount"):
print(interpret_rowcount(result.rowcount))
# bypass ResultSet and use duckdb's native method to return a pandas data frame
if duckdb_autopandas:
df = cursor.df()
conn.close()
return df
else:
resultset = ResultSet(result, config)
return select_df_type(resultset, config)
def raw_run(conn, sql):
return conn.session.execute(sqlalchemy.sql.text(sql))
class PrettyTable(prettytable.PrettyTable):
def __init__(self, *args, **kwargs):
self.row_count = 0
self.displaylimit = None
return super(PrettyTable, self).__init__(*args, **kwargs)
def add_rows(self, data):
if self.row_count and (data.config.displaylimit == self.displaylimit):
return # correct number of rows already present
self.clear_rows()
self.displaylimit = data.config.displaylimit
if self.displaylimit == 0:
self.displaylimit = None # TODO: remove this to make 0 really 0
if self.displaylimit in (None, 0):
self.row_count = len(data)
else:
self.row_count = min(len(data), self.displaylimit)
for row in data[: self.displaylimit]:
formatted_row = []
for cell in row:
if isinstance(cell, str) and cell.startswith("http"):
formatted_row.append("<a href={}>{}</a>".format(cell, cell))
else:
formatted_row.append(cell)
self.add_row(formatted_row)