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from AnyQt.QtWidgets import QComboBox, QTextEdit, QMessageBox, QApplication, \
QGridLayout, QLineEdit
from AnyQt.QtGui import QCursor
from AnyQt.QtCore import Qt
from orangewidget.utils.combobox import ComboBoxSearch
from Orange.data import Table
from Orange.data.sql.backend import Backend
from Orange.data.sql.backend.base import BackendError
from Orange.data.sql.table import SqlTable, LARGE_TABLE, AUTO_DL_LIMIT
from Orange.widgets import gui
from Orange.widgets.settings import Setting
from Orange.widgets.utils.itemmodels import PyListModel
from Orange.widgets.utils.owbasesql import OWBaseSql
from Orange.widgets.utils.widgetpreview import WidgetPreview
from Orange.widgets.widget import Output, Msg
MAX_DL_LIMIT = 1000000
MAX_TABLES = 1000
def is_postgres(backend):
return getattr(backend, 'display_name', '') == "PostgreSQL"
class TableModel(PyListModel):
def data(self, index, role=Qt.DisplayRole):
row = index.row()
if role == Qt.DisplayRole:
return str(self[row])
return super().data(index, role)
class BackendModel(PyListModel):
def data(self, index, role=Qt.DisplayRole):
row = index.row()
if role == Qt.DisplayRole:
return self[row].display_name
return super().data(index, role)
class OWSql(OWBaseSql):
name = "SQL Table"
id = "orange.widgets.data.sql"
description = "Load dataset from SQL."
icon = "icons/SQLTable.svg"
priority = 30
category = "Data"
keywords = "sql table, load"
class Outputs:
data = Output("Data", Table, doc="Attribute-valued dataset read from the input file.")
settings_version = 2
buttons_area_orientation = None
TABLE, CUSTOM_SQL = range(2)
selected_backend = Setting(None)
data_source = Setting(TABLE)
table = Setting(None)
sql = Setting("")
guess_values = Setting(True)
materialize = Setting(False)
materialize_table_name = Setting("")
class Information(OWBaseSql.Information):
data_sampled = Msg("Data description was generated from a sample.")
class Error(OWBaseSql.Error):
no_backends = Msg("Please install a backend to use this widget.")
def __init__(self):
# Lint
self.backends = None
self.backendcombo = None
self.tables = None
self.tablecombo = None
self.tabletext = None
self.sqltext = None
self.custom_sql = None
super().__init__()
def _setup_gui(self):
super()._setup_gui()
self._add_backend_controls()
self._add_tables_controls()
def _add_backend_controls(self):
box = self.serverbox
self.backends = BackendModel(Backend.available_backends())
self.backendcombo = QComboBox(box)
if self.backends:
self.backendcombo.setModel(self.backends)
names = [backend.display_name for backend in self.backends]
if self.selected_backend and self.selected_backend in names:
self.backendcombo.setCurrentText(self.selected_backend)
else:
self.Error.no_backends()
box.setEnabled(False)
self.backendcombo.currentTextChanged.connect(self.__backend_changed)
box.layout().insertWidget(0, self.backendcombo)
def __backend_changed(self):
backend = self.get_backend()
self.selected_backend = backend.display_name if backend else None
def _add_tables_controls(self):
box = gui.vBox(self.controlArea, 'Data Selection')
form = QGridLayout()
radio_buttons = gui.radioButtons(
box, self, 'data_source', orientation=form,
callback=self.__on_data_source_changed)
radio_table = gui.appendRadioButton(
radio_buttons, 'Table:', addToLayout=False)
radio_custom_sql = gui.appendRadioButton(
radio_buttons, 'Custom SQL:', addToLayout=False)
self.tables = TableModel()
self.tablecombo = ComboBoxSearch(
minimumContentsLength=35,
sizeAdjustPolicy=QComboBox.AdjustToMinimumContentsLengthWithIcon
)
self.tablecombo.setModel(self.tables)
self.tablecombo.setToolTip('table')
self.tablecombo.activated[int].connect(self.select_table)
self.tabletext = QLineEdit(placeholderText='TABLE_NAME')
self.tabletext.setToolTip('table')
self.tabletext.editingFinished.connect(self.select_table)
self.tabletext.setVisible(False)
self.custom_sql = gui.vBox(box)
self.custom_sql.setVisible(self.data_source == self.CUSTOM_SQL)
self.sqltext = QTextEdit(self.custom_sql)
self.sqltext.setPlainText(self.sql)
self.custom_sql.layout().addWidget(self.sqltext)
mt = gui.hBox(self.custom_sql)
cb = gui.checkBox(mt, self, 'materialize', 'Materialize to table ')
cb.setToolTip('Save results of the query in a table')
le = gui.lineEdit(mt, self, 'materialize_table_name')
le.setToolTip('Save results of the query in a table')
gui.button(self.custom_sql, self, 'Execute', callback=self.open_table)
form.addWidget(radio_table, 1, 0, Qt.AlignLeft)
form.addWidget(self.tablecombo, 1, 1)
form.addWidget(self.tabletext, 1, 1)
form.addWidget(radio_custom_sql, 2, 0, Qt.AlignLeft)
gui.checkBox(box, self, "guess_values",
"Auto-discover categorical variables",
callback=self.open_table)
def __on_data_source_changed(self):
self.custom_sql.setVisible(self.data_source == self.CUSTOM_SQL)
self.select_table()
def highlight_error(self, text=""):
err = ['', 'QLineEdit {border: 2px solid red;}']
self.servertext.setStyleSheet(err['server' in text or 'host' in text])
self.usernametext.setStyleSheet(err['role' in text])
self.databasetext.setStyleSheet(err['database' in text])
def get_backend(self):
if self.backendcombo.currentIndex() < 0:
return None
return self.backends[self.backendcombo.currentIndex()]
def on_connection_success(self):
super().on_connection_success()
self.refresh_tables()
self.select_table()
def on_connection_error(self, err):
super().on_connection_error(err)
self.highlight_error(str(err).split("\n")[0])
def clear(self):
super().clear()
self.highlight_error()
self.tablecombo.clear()
self.tablecombo.repaint()
def refresh_tables(self):
self.tables.clear()
if self.backend is None:
self.data_desc_table = None
return
self.tables.append("Select a table")
if self.backend.n_tables(self.schema) <= MAX_TABLES:
self.tables.extend(self.backend.list_tables(self.schema))
index = self.tablecombo.findText(str(self.table))
self.tablecombo.setCurrentIndex(index if index != -1 else 0)
self.tablecombo.setVisible(True)
self.tabletext.setVisible(False)
else:
self.tablecombo.setVisible(False)
self.tabletext.setVisible(True)
self.tablecombo.repaint()
# Called on tablecombo selection change:
def select_table(self):
if self.data_source == self.TABLE:
return self.open_table()
else:
self.data_desc_table = None
if self.database_desc:
self.database_desc["Table"] = "(None)"
self.table = None
if len(str(self.sql)) > 14:
return self.open_table()
return None
def get_table(self):
if self.backend is None:
return None
curIdx = self.tablecombo.currentIndex()
if self.data_source == self.TABLE and curIdx <= 0 and \
self.tabletext.text() == "":
if self.database_desc:
self.database_desc["Table"] = "(None)"
self.data_desc_table = None
return None
if self.data_source == self.TABLE:
self.table = self.tables[curIdx] if curIdx > 0 else \
self.tabletext.text()
self.database_desc["Table"] = self.table
if "Query" in self.database_desc:
del self.database_desc["Query"]
what = self.table
else:
what = self.sql = self.sqltext.toPlainText()
self.table = "Custom SQL"
if self.materialize:
if not self.materialize_table_name:
self.Error.connection(
"Specify a table name to materialize the query")
return None
try:
with self.backend.execute_sql_query("DROP TABLE IF EXISTS " +
self.materialize_table_name):
pass
with self.backend.execute_sql_query("CREATE TABLE " +
self.materialize_table_name +
" AS " + self.sql):
pass
with self.backend.execute_sql_query("ANALYZE " + self.materialize_table_name):
pass
except BackendError as ex:
self.Error.connection(str(ex))
return None
try:
table = SqlTable(dict(host=self.host,
port=self.port,
database=self.database,
user=self.username,
password=self.password),
what,
backend=type(self.backend),
inspect_values=False)
except BackendError as ex:
self.Error.connection(str(ex))
return None
self.Error.connection.clear()
sample = False
if table.approx_len() > LARGE_TABLE and self.guess_values:
confirm = QMessageBox(self)
confirm.setIcon(QMessageBox.Warning)
confirm.setText("Attribute discovery might take "
"a long time on large tables.\n"
"Do you want to auto discover attributes?")
confirm.addButton("Yes", QMessageBox.YesRole)
no_button = confirm.addButton("No", QMessageBox.NoRole)
if is_postgres(self.backend):
sample_button = confirm.addButton("Yes, on a sample",
QMessageBox.YesRole)
confirm.exec()
if confirm.clickedButton() == no_button:
self.guess_values = False
elif is_postgres(self.backend) and \
confirm.clickedButton() == sample_button:
sample = True
self.Information.clear()
if self.guess_values:
QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
if sample:
s = table.sample_time(1)
domain = s.get_domain(inspect_values=True)
self.Information.data_sampled()
else:
domain = table.get_domain(inspect_values=True)
QApplication.restoreOverrideCursor()
table.domain = domain
if table.approx_len() > AUTO_DL_LIMIT:
if is_postgres(self.backend):
confirm = QMessageBox(self)
confirm.setIcon(QMessageBox.Warning)
confirm.setText("Data appears to be big. Do you really "
"want to download it to local memory?\n"
"Table length: {:,}. Limit {:,}".format(
table.approx_len(), MAX_DL_LIMIT))
if table.approx_len() <= MAX_DL_LIMIT:
confirm.addButton("Yes", QMessageBox.YesRole)
no_button = confirm.addButton("No", QMessageBox.NoRole)
sample_button = confirm.addButton("Yes, a sample",
QMessageBox.YesRole)
confirm.exec()
if confirm.clickedButton() == no_button:
return None
elif confirm.clickedButton() == sample_button:
table = table.sample_percentage(
AUTO_DL_LIMIT / table.approx_len() * 100)
else:
if table.approx_len() > MAX_DL_LIMIT:
QMessageBox.warning(
self, 'Warning',
"Data is too big to download.\n"
"Table length: {:,}. Limit {:,}".format(table.approx_len(), MAX_DL_LIMIT)
)
return None
else:
confirm = QMessageBox.question(
self, 'Question',
"Data appears to be big. Do you really "
"want to download it to local memory?",
QMessageBox.Yes | QMessageBox.No, QMessageBox.No)
if confirm == QMessageBox.No:
return None
table.download_data(MAX_DL_LIMIT)
table = Table(table)
return table
@classmethod
def migrate_settings(cls, settings, version):
if version < 2:
# Until Orange version 3.4.4 username and password had been stored
# in Settings.
cm = cls._credential_manager(settings["host"], settings["port"])
cm.username = settings["username"]
cm.password = settings["password"]
if __name__ == "__main__": # pragma: no cover
WidgetPreview(OWSql).run()
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