在第1行截断列'url'的数据 - 使用Python Django编程时出错

Question

我得到的错误信息是

Traceback (most recent call last):
  File "./test.py", line 416, in <module>
    startup()
  File "./test.py", line 275, in startup
    writer.save(r,data) 
  File "/home/user/project/test/output.py", line 91, in save
    self.save_doc(r, data, pid)
  File "/home/user/project/test/output.py", line 130, in save_doc
    cursor.execute(dbquery)
  File "/usr/local/lib/python2.6/site-packages/django/db/backends/util.py", line 34, in execute
    return self.cursor.execute(sql, params)
  File "/usr/local/lib/python2.6/site-packages/django/db/backends/mysql/base.py", line 86, in execute
    return self.cursor.execute(query, args)
  File "/usr/local/lib/python2.6/site-packages/MySQL_python-1.2.3c1-py2.6-linux-x86_64.egg/MySQLdb/cursors.py", line 175, in execute
  File "/usr/local/lib/python2.6/site-packages/MySQL_python-1.2.3c1-py2.6-linux-x86_64.egg/MySQLdb/cursors.py", line 89, in _warning_check
_mysql_exceptions.Warning: Data truncated for column 'url' at row 1

我检查的第一件事是URL字符串是否长于字段长度,但它实际上要短得多.数据库设计

+----------+-------------------------------------------------------------------+
| Database | Create Database                                                   |
+----------+-------------------------------------------------------------------+
| myurlcol | CREATE DATABASE `myurlcol` /*!40100 DEFAULT CHARACTER SET utf8 */ | 
+----------+-------------------------------------------------------------------+

表设计

  CREATE TABLE `document` (
  `id` int(11) NOT NULL auto_increment,
  `url` varchar(255) collate utf8_bin NOT NULL,
  `md5` varchar(32) collate utf8_bin NOT NULL,
  `host` varchar(255) collate utf8_bin default NULL,
  `content_sha1` varchar(40) collate utf8_bin NOT NULL,
  `add_date` datetime NOT NULL,
  PRIMARY KEY  (`id`),
  UNIQUE KEY `url` (`url`),
  UNIQUE KEY `md5` (`md5`),
  KEY `main_crawl_document_content_sha1` (`content_sha1`),
  KEY `main_crawl_document_discover_date` (`add_date`),
  KEY `main_crawl_document_host` (`host`),
  ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

我打印出我试图插入表中的数据的长度(我只使用一个URL进行测试):

len(url) =  89
len(md5) =  32
len(host) =  20
len(content_sha1) =  40
len(add_date) =  19

我正在使用Django.db.connection创建的游标.为了提供更多信息,我粘贴了传递给我的完整数据库查询命令cursor.execute()

INSERT INTO main_document SET url='ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/0a/39/Arthritis_Res_2000_Jun_5_2%284%29_315-326.tar.gz',md5='b6ba3adde8de87e4dc255092b04d07ea',host='ftp.ncbi.nlm.nih.gov',content_sha1='9aeab4412cc9b1add84a6d2bca574664e193b56e',add_date='2012-05-15 00:00:00';

有趣的是,当我复制并粘贴到MySQL命令行时,上面的命令有效.没有错误消息和数据只是正确插入.

出了什么问题？

Answer 1

您应该尝试urllib.unquote(url)在将url 字符串插入数据库之前取消引号。字符串中出现的引号字符标记 % 是MySQL 的特殊字符，可能会破坏您的事务。

您的插入内容应为：

INSERT INTO main_document SET url='ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/0a/39/Arthritis_Res_2000_Jun_5_2(4)_315-326.tar.gz',md5='b6ba3adde8de87e4dc255092b04d07ea',host='ftp.ncbi.nlm.nih.gov',content_sha1='9aeab4412cc9b1add84a6d2bca574664e193b56e',add_date='2012-05-15 00:00:00';

请注意，MySQL 仅在模式匹配上下文中将 % 视为特殊字符。所以这里最终可能是Django ORM出了问题。