miso问题2

##
## MISO into SQL database interface
##
import os
import sys
import time

import zipfile
import sqlite3
import shutil
import fnmatch
import glob
import StringIO

import misopy
import misopy.misc_utils as misc_utils
import misopy.miso_utils as miso_utils

# File extension for MISO SQLite databases
MISO_DB_EXT = ".miso_db"


class MISODatabase:
    """
    Representation of a MISO SQLite database.
    """
    def __init__(self, db_fname, comp_to_uncomp=None):
        self.comp_to_uncomp = comp_to_uncomp
        # Get mapping of uncompressed to compressed
        # event IDs
        self.uncomp_to_comp = None
        if self.comp_to_uncomp is not None:
            # Make mapping from uncompressed to compressed IDs
            self.uncomp_to_comp = misc_utils.inv_dict(self.comp_to_uncomp)
        if not os.path.isfile(db_fname):
            raise Exception, "%s does not exist." %(db_fname)
        self.db_fname = db_fname
        # Create table names that start with 'table_' to properly handle
        # Ensembl headers, which are numeric only and tables cannot
        # be named numerically.
        self.table_name = "table_%s" %(get_table_name_from_file(self.db_fname))
        if self.table_name is None:
            print "Error: Cannot retrieve name of MISO db file %s" \
                  %(self.db_fname)
            return None
        self.conn = sqlite3.connect(self.db_fname)
        # Determine event name format
        self.is_db_events_compressed = self.is_event_name_compressed()
        

    def is_event_name_compressed(self):
        """
        Determine if the events in the database are compressed
        or not.
        """
        c = self.conn.cursor()
        results = \
          c.execute("SELECT * from %s" %(self.table_name