sqlite-mysql.py

#!/usr/bin/env python
 
import re
import fileinput
 
def this_line_is_useless(line):
    useless_es = [
        'BEGIN TRANSACTION',
        'COMMIT',
        'sqlite_sequence',
        'CREATE UNIQUE INDEX',
        'PRAGMA foreign_keys=OFF',
    ]
    for useless in useless_es:
        if re.search(useless, line):
            return True
 
def has_primary_key(line):
    return bool(re.search(r'PRIMARY KEY', line))
 
searching_for_end = False
for line in fileinput.input():
    if this_line_is_useless(line):
        continue
 
    # this line was necessary because ''); was getting
    # converted (inappropriately) to \');
    if re.match(r".*, ''\);", line):
        line = re.sub(r"''\);", r'``);', line)
 
    if re.match(r'^CREATE TABLE.*', line):
        searching_for_end = True
 
    m = re.search('CREATE TABLE "?([a-zA-Z_]*)"?(.*)', line)
    if m:
        name, sub = m.groups()
        line = "DROP TABLE IF EXISTS %(name)s;\nCREATE TABLE IF NOT EXISTS `%(name)s`%(sub)s\n"
        line = line % dict(name=name, sub=sub)
    else:
        m = re.search('INSERT INTO "([a-zA-Z_]*)"(.*)', line)
        if m:
            line = 'INSERT INTO %s%s\n' % m.groups()
            line = line.replace('"', r'\"')
            line = line.replace('"', "'")
    line = re.sub(r"([^'])'t'(.)", "\1THIS_IS_TRUE\2", line)
    line = line.replace('THIS_IS_TRUE', '1')
    line = re.sub(r"([^'])'f'(.)", "\1THIS_IS_FALSE\2", line)
    line = line.replace('THIS_IS_FALSE', '0')
 
    # Add auto_increment if it's not there since sqlite auto_increments ALL
    # primary keys
    if searching_for_end:
        if re.search(r"integer(?:\s+\w+)*\s*PRIMARY KEY(?:\s+\w+)*\s*,", line):
            line = line.replace("PRIMARY KEY", "PRIMARY KEY AUTO_INCREMENT")
        # replace " and ' with ` because mysql doesn't like quotes in CREATE commands
        if line.find('DEFAULT') == -1:
            line = line.replace(r'"', r'`').replace(r"'", r'`')
        else:
            parts = line.split('DEFAULT')
            parts[0] = parts[0].replace(r'"', r'`').replace(r"'", r'`')
            line = 'DEFAULT'.join(parts)
 
    # And now we convert it back (see above)
    if re.match(r".*, ``\);", line):
        line = re.sub(r'``\);', r"'');", line)
 
    if searching_for_end and re.match(r'.*\);', line):
        searching_for_end = False
 
    if re.match(r"CREATE INDEX", line):
        line = re.sub('"', '`', line)
 
    print line,