Python连接MySQL并使用fetchall()方法过滤特殊字符

sudo apt-get install MySQLdb

python
Python 2.7.6 (default, Jun 22 2015, 17:58:13) 
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import MySQLdb
>>>

CREATE DATABASE study;
use study;
DROP TABLE IF EXISTS python_demo;
CREATE TABLE python_demo (
 id int NOT NULL AUTO_INCREMENT COMMENT '主键，自增',
 user_no int NOT NULL COMMENT '用户编号',
 user_name VARBINARY(50) NOT NULL COMMENT '用户名',
 password VARBINARY(50) NOT NULL COMMENT '用户密码',
 remark VARBINARY(255) NOT NULL COMMENT '用户备注',
 PRIMARY KEY (id,user_no)
)ENGINE =innodb DEFAULT CHARSET = utf8 COMMENT '用户测试表';

INSERT INTO python_demo(user_no, user_name, password, remark) VALUES
 (1001,'张三01','admin','我是张三');
INSERT INTO python_demo(user_no, user_name, password, remark) VALUES
 (1002,'张三02','admin','我是张三');
INSERT INTO python_demo(user_no, user_name, password, remark) VALUES
 (1003,'张三03','admin','我是张三');
INSERT INTO python_demo(user_no, user_name, password, remark) VALUES
 (1004,'张三04','admin','我是张三');
INSERT INTO python_demo(user_no, user_name, password, remark) VALUES
 (1005,'张三05','admin','我是张三');
INSERT INTO python_demo(user_no, user_name, password, remark) VALUES
 (1006,'张三06','admin','我是张三');
INSERT INTO python_demo(user_no, user_name, password, remark) VALUES
 (1007,'张三07','admin','我是张三');
INSERT INTO python_demo(user_no, user_name, password, remark) VALUES
 (1008,'张三08','admin','我是张三');

# --coding=utf8--
import ConfigParser

import sys
import MySQLdb

def init_db():
  try:
    conn = MySQLdb.connect(host=conf.get('Database', 'host'),
                user=conf.get('Database', 'user'),
                passwd=conf.get('Database', 'passwd'),
                db=conf.get('Database', 'db'),
                charset='utf8')
    return conn
  except:
    print "Error:数据库连接错误"
    return None

def select_demo(conn, sql):
  try:
    cursor = conn.cursor()
    cursor.execute(sql)
    return cursor.fetchall()
  except:
    print "Error:数据库连接错误"
    return None

def update_demo():
  pass

def delete_demo():
  pass

def insert_demo():
  pass

if __name__ == '__main__':
  conf = ConfigParser.ConfigParser()
  conf.read('mysql.conf')
  conn = init_db()
  sql = "select * from %s" % conf.get('Database', 'table')
  data = select_demo(conn, sql)
  pass

select replace(replace(replace(column1,'\r',''),'\n',''),'\t','')

CREATE TABLE `filter_fields` (
 `field1` varchar(50) DEFAULT NULL,
 `field2` varchar(50) DEFAULT NULL,
 `field3` varchar(50) DEFAULT NULL,
 `field4` varchar(50) DEFAULT NULL,
 `field5` varchar(50) DEFAULT NULL,
 `field6` varchar(50) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

insert into filter_fields(field1,field2,field3,field4,field5,field6) VALUES
('test01','test02','test03','test04','test05','test06');
insert into filter_fields(field1,field2,field3,field4,field5,field6) VALUES
('test11\ntest11','test12\n\n','test13','test14','test15','test16');
insert into filter_fields(field1,field2,field3,field4,field5,field6) VALUES
('test21\ttest21','test22\ttest22\ttest22','test23\t\t\t','test4','test5','test6');
insert into filter_fields(field1,field2,field3,field4,field5,field6) VALUES
('test21\rest21','test22\r\rest22\r\rest22','test23\r\r\r','test4','test5','test6');

# coding=utf-8

import MySQLdb
import sys

db_host = '127.0.0.1'  # 数据库地址
db_port = 3306     # 数据库端口
db_user = 'root'    # mysql用户名
db_pwd = 'yourpassword' # mysql用户密码,换成你的密码
db_name = 'test'    # 数据库名
db_table = 'filter_fields' # 数据库表

# 过滤sql字段结果中的\t\n
def extract_data(table_name):
  try:
    conn = MySQLdb.connect(host=db_host, port = db_port, user=db_user,
                passwd = db_pwd, db = db_name, charset = "utf8")
    cursor = conn.cursor()
  except MySQLdb.Error, e:
    print '数据库连接异常'
    sys.exit(1)

  try:
    sql = 'select * from %s;'%(table_name)
    cursor.execute(sql)
    rows = cursor.fetchall()

    print '====字段未过滤查询结果===='
    for row in rows:
      print row

    print '====字段过滤之后结果===='
    rows_list = []
    for row in rows:
      row_list = []
      for column in row:
        row_list.append(column.replace('\t', '').replace('\n', '').replace('\r', ''))
      rows_list.append(row_list)
      print rows_list[-1] # [-1]表示列表最后一个元素
    return rows_list
  except MySQLdb.Error, e:
    print '执行sql语句失败'
    cursor.close()
    conn.close()
    sys.exit(1)

if __name__ == '__main__':
  print 'begin:'
  rows = extract_data(db_table)
  pass

(u'test01', u'test02', u'test03', u'test04', u'test05', u'test06')
(u'test11\ntest11', u'test12\n\n', u'test13', u'test14', u'test15', u'test16')
(u'test21\ttest21', u'test22\ttest22\ttest22', u'test23\t\t\t', u'test4', u'test5', u'test6')
(u'test21\rest21', u'test22\r\rest22\r\rest22', u'test23\r\r\r', u'test4', u'test5', u'test6')

[u'test01', u'test02', u'test03', u'test04', u'test05', u'test06']
[u'test11test11', u'test12', u'test13', u'test14', u'test15', u'test16']
[u'test21test21', u'test22test22test22', u'test23', u'test4', u'test5', u'test6']
[u'test21est21', u'test22est22est22', u'test23', u'test4', u'test5', u'test6']