class_docstr: Sqlite backed document storage.
  
  Implements get_doc_text(doc_id).
docstr: Fetch the raw text of the doc for 'doc_id'.
code: def get_doc_value(self, doc_id):
      """
      Fetch the raw text of the doc for 'doc_id'.
      """
      cursor = self.connection.cursor()
      cursor.execute(
          "SELECT value FROM documents WHERE id = ?",
          (utils.normalize(doc_id),),
      )
      result = cursor.fetchone()
      cursor.close()
      return result if result is None else result[0]
  
file_path: ParlAI/parlai/agents/tfidf_retriever/doc_db.py
imports: import sqlite3
  from .None import utils
label_desc: Use image node_id 7 for calling the DocDB obj's underlying member method code with example usage: obj.get_doc_value(doc_id) and returns: unknown