From 420af04098810cb5cbfdf276ebfb01cb0933920e Mon Sep 17 00:00:00 2001
From: Gunther Cox <gunthercx@gmail.com>
Date: Sat, 10 Jun 2017 08:47:34 -0400
Subject: [PATCH] Create tables if they do not exist

---
 chatterbot/storage/sql_storage.py        | 280 +++++++++++++++++++++++
 chatterbot/storage/sqlalchemy_storage.py |   4 +-
 2 files changed, 281 insertions(+), 3 deletions(-)
 create mode 100644 chatterbot/storage/sql_storage.py

diff --git a/chatterbot/storage/sql_storage.py b/chatterbot/storage/sql_storage.py
new file mode 100644
index 000000000..0d3cd8b1a
--- /dev/null
+++ b/chatterbot/storage/sql_storage.py
@@ -0,0 +1,280 @@
+import json
+import random
+
+from chatterbot.storage import StorageAdapter
+from chatterbot.conversation import Response
+from chatterbot.conversation import Statement
+
+Base = None
+
+try:
+    from sqlalchemy.ext.declarative import declarative_base
+
+    Base = declarative_base()
+
+    class StatementTable(Base):
+        from sqlalchemy import Column, Integer, String, PickleType
+        from sqlalchemy.orm import relationship
+
+        __tablename__ = 'StatementTable'
+
+        def get_statement(self):
+            stmt = Statement(self.text, **self.extra_data)
+            for resp in self.in_response_to:
+                stmt.add_response(resp.get_response())
+            return stmt
+
+        def get_statement_serialized(context):
+            params = context.current_parameters
+            del params['text_search']
+            return json.dumps(params)
+
+        id = Column(Integer)
+        text = Column(String, primary_key=True)
+        extra_data = Column(PickleType)
+        # relationship:
+        in_response_to = relationship("ResponseTable", back_populates="statement_table")
+        text_search = Column(String, primary_key=True, default=get_statement_serialized)
+
+    class ResponseTable(Base):
+        from sqlalchemy import Column, Integer, String, ForeignKey
+        from sqlalchemy.orm import relationship
+
+        __tablename__ = 'ResponseTable'
+
+        def get_reponse_serialized(context):
+            params = context.current_parameters
+            del params['text_search']
+            return json.dumps(params)
+
+        id = Column(Integer)
+        text = Column(String, primary_key=True)
+        occurrence = Column(Integer)
+        statement_text = Column(String, ForeignKey('StatementTable.text'))
+
+        statement_table = relationship("StatementTable", back_populates="in_response_to", cascade="all", uselist=False)
+        text_search = Column(String, primary_key=True, default=get_reponse_serialized)
+
+        def get_response(self):
+            occ = {"occurrence": self.occurrence}
+            return Response(text=self.text, **occ)
+
+except ImportError:
+    pass
+
+
+def get_statement_table(statement):
+    responses = list(map(get_response_table, statement.in_response_to))
+    return StatementTable(text=statement.text, in_response_to=responses, extra_data=statement.extra_data)
+
+
+def get_response_table(response):
+    return ResponseTable(text=response.text, occurrence=response.occurrence)
+
+
+class SQLStorageAdapter(StorageAdapter):
+
+    def __init__(self, **kwargs):
+        super(SQLStorageAdapter, self).__init__(**kwargs)
+
+        from sqlalchemy import create_engine
+        from sqlalchemy.orm import sessionmaker
+
+        self.database_name = self.kwargs.get("database")
+
+        if self.database_name:
+
+            # Create a sqlite file if a database name is provided
+            self.database_uri = self.kwargs.get(
+                "database_uri", "sqlite:///" + self.database_name + ".db"
+            )
+
+        # The default uses sqlite in-memory database
+        self.database_uri = self.kwargs.get(
+            "database_uri", "sqlite://"
+        )
+
+        self.engine = create_engine(self.database_uri)
+
+        self.read_only = self.kwargs.get(
+            "read_only", False
+        )
+
+        if not self.engine.dialect.has_table(self.engine, 'StatementTable'):
+            self.create()
+
+        self.Session = sessionmaker(bind=self.engine, expire_on_commit=True)
+
+    def count(self):
+        """
+        Return the number of entries in the database.
+        """
+        session = self.Session()
+        statement_count = session.query(StatementTable).count()
+        session.close()
+        return statement_count
+
+    def __statement_filter(self, session, **kwargs):
+        """
+        Apply filter operation on StatementTable
+
+        rtype: query
+        """
+        _query = session.query(StatementTable)
+        return _query.filter_by(**kwargs)
+
+    def find(self, statement_text):
+        """
+        Returns a statement if it exists otherwise None
+        """
+        session = self.Session()
+        query = self.__statement_filter(session, **{"text": statement_text})
+        record = query.first()
+        if record:
+            statement = record.get_statement()
+            session.close()
+            return statement
+
+        session.close()
+        return None
+
+    def remove(self, statement_text):
+        """
+        Removes the statement that matches the input text.
+        Removes any responses from statements where the response text matches
+        the input text.
+        """
+        session = self.Session()
+        query = self.__statement_filter(session, **{"text": statement_text})
+        record = query.first()
+
+        session.delete(record)
+
+        self._session_finish(session, statement_text)
+
+    def filter(self, **kwargs):
+        """
+        Returns a list of objects from the database.
+        The kwargs parameter can contain any number
+        of attributes. Only objects which contain
+        all listed attributes and in which all values
+        match for all listed attributes will be returned.
+        """
+        session = self.Session()
+
+        filter_parameters = kwargs.copy()
+
+        statements = []
+        # _response_query = None
+        _query = None
+        if len(filter_parameters) == 0:
+            _response_query = session.query(StatementTable)
+            statements.extend(_response_query.all())
+        else:
+            for i, fp in enumerate(filter_parameters):
+                _filter = filter_parameters[fp]
+                if fp in ['in_response_to', 'in_response_to__contains']:
+                    _response_query = session.query(StatementTable)
+                    if isinstance(_filter, list):
+                        if len(_filter) == 0:
+                            _query = _response_query.filter(
+                                StatementTable.in_response_to == None)  # NOQA Here must use == instead of is
+                        else:
+                            for f in _filter:
+                                _query = _response_query.filter(
+                                    StatementTable.in_response_to.contains(get_response_table(f)))
+                    else:
+                        if fp == 'in_response_to__contains':
+                            _query = _response_query.join(ResponseTable).filter(ResponseTable.text == _filter)
+                        else:
+                            _query = _response_query.filter(StatementTable.in_response_to == None)  # NOQA
+                else:
+                    if _query:
+                        _query = _query.filter(ResponseTable.text_search.like('%' + _filter + '%'))
+                    else:
+                        _response_query = session.query(ResponseTable)
+                        _query = _response_query.filter(ResponseTable.text_search.like('%' + _filter + '%'))
+
+                if _query is None:
+                    return []
+                if len(filter_parameters) == i + 1:
+                    statements.extend(_query.all())
+
+        results = []
+
+        for statement in statements:
+            if isinstance(statement, ResponseTable):
+                if statement and statement.statement_table:
+                    results.append(statement.statement_table.get_statement())
+            else:
+                if statement:
+                    results.append(statement.get_statement())
+
+        session.close()
+
+        return results
+
+    def update(self, statement):
+        """
+        Modifies an entry in the database.
+        Creates an entry if one does not exist.
+        """
+        if statement:
+            session = self.Session()
+            query = self.__statement_filter(session, **{"text": statement.text})
+            record = query.first()
+
+            if record:
+                # update
+                if statement.text:
+                    record.text = statement.text
+                if statement.extra_data:
+                    record.extra_data = dict[statement.extra_data]
+                if statement.in_response_to:
+                    record.in_response_to = list(map(get_response_table, statement.in_response_to))
+                session.add(record)
+            else:
+                session.add(get_statement_table(statement))
+
+            self._session_finish(session)
+
+    def get_random(self):
+        """
+        Returns a random statement from the database
+        """
+        session = self.Session()
+        count = self.count()
+        if count < 1:
+            raise self.EmptyDatabaseException()
+
+        rand = random.randrange(0, count)
+        stmt = session.query(StatementTable)[rand]
+
+        statement = stmt.get_statement()
+
+        session.close()
+        return statement
+
+    def drop(self):
+        """
+        Drop the database attached to a given adapter.
+        """
+        Base.metadata.drop_all(self.engine)
+
+    def create(self):
+        """
+        Populate the database with the tables.
+        """
+        Base.metadata.create_all(self.engine)
+
+    def _session_finish(self, session, statement_text=None):
+        from sqlalchemy.exc import DatabaseError
+        try:
+            if not self.read_only:
+                session.commit()
+            else:
+                session.rollback()
+        except DatabaseError as e:
+            self.logger.error(statement_text, str(e.orig))
+        finally:
+            session.close()
diff --git a/chatterbot/storage/sqlalchemy_storage.py b/chatterbot/storage/sqlalchemy_storage.py
index 53083c75e..6356531dd 100644
--- a/chatterbot/storage/sqlalchemy_storage.py
+++ b/chatterbot/storage/sqlalchemy_storage.py
@@ -100,9 +100,7 @@ def __init__(self, **kwargs):
             "read_only", False
         )
 
-        create = self.kwargs.get("create", False)
-
-        if not self.read_only and create:
+        if not self.engine.dialect.has_table(self.engine, 'StatementTable'):
             self.create()
 
         self.Session = sessionmaker(bind=self.engine, expire_on_commit=True)