class_docstr: Sqlite backed document storage.
  
  Implements get_doc_text(doc_id).
code: def __init__(self, db_path=None):
      self.path = db_path
      self.connection = sqlite3.connect(
          self.path, check_same_thread=False
      )
  
file_path: ParlAI/parlai/agents/tfidf_retriever/doc_db.py
imports: import sqlite3
  from .None import utils
label_desc: Use image node_id 1 to create a new DocDB object from inherited base classes: object with example: obj = DocDB(db_path)