检查数据不一致脚本

import MySQLdb
max_id=250000
sql_prefix="select crc32(group_concat(concat(id,k,c,pad))) from  sbtest1 where id>= %s and id < %s"
xhdb1 = MySQLdb.connect(host="*",    # your host, usually localhost
                     user="sbtest",         # your username
                     passwd="*",  # your password
                     db="sbtest",
                     port=5002)        # name of the data base

ypdb1 = MySQLdb.connect(host="*",    # your host, usually localhost
                     user="sbtest",         # your username
                     passwd="*",  # your password
                     db="sbtest",
                     port=5002)        # name of the data base


i = 1

increment = 1000
xhdb1cur = xhdb1.cursor()
xhdb1cur.execute("set session group_concat_max_len =18446744073709551615")
ypdb1cur = ypdb1.cursor()
ypdb1cur.execute("set session group_concat_max_len =18446744073709551615")


while True:
        sql = sql_prefix % (str(i) , str(i + increment))
        xhdb1cur.execute(sql)
        ypdb1cur.execute(sql)
        for xhdb1row in xhdb1cur.fetchall():
                break
        for ypdb1row in ypdb1cur.fetchall():
                break
        if xhdb1row[0] != ypdb1row[0]:
                print "find different between %s and %s " % (str(i) , str(i+increment))
                increment = increment/10
                continue
        i += increment
        if i > max_id:
                break
        if increment < 1:
                break