Inserting JSON into MySQL using Python

Question

I have a JSON object in Python. I am Using Python DB-API and SimpleJson. I am trying to insert the json into a MySQL table.

At moment am getting errors and I believe it is due to the single quotes '' in the JSON Objects.

How can I insert my JSON Object into MySQL using Python?

Here is the error message I get:

error: uncaptured python exception, closing channel  <twitstream.twitasync.TwitterStreamPOST connected at  0x7ff68f91d7e8> (<class '_mysql_exceptions.ProgrammingError'>: (1064, "You have an error in your SQL syntax; check the  manual that corresponds to your MySQL server version for  the right syntax to use near ''favorited': '0',  'in_reply_to_user_id': '52063869', 'contributors':  'NULL', 'tr' at line 1")  [/usr/lib/python2.5/asyncore.py|read|68]  [/usr/lib/python2.5/asyncore.py|handle_read_event|390]  [/usr/lib/python2.5/asynchat.py|handle_read|137]  [/usr/lib/python2.5/site-packages/twitstream-0.1-py2.5.egg/ twitstream/twitasync.py|found_terminator|55] [twitter.py|callback|26]  [build/bdist.linux-x86_64/egg/MySQLdb/cursors.py|execute|166]  [build/bdist.linux-x86_64/egg/MySQLdb/connections.py|defaulterrorhandler|35]) 

Another error for reference

error: uncaptured python exception, closing channel  <twitstream.twitasync.TwitterStreamPOST connected at  0x7feb9d52b7e8> (<class '_mysql_exceptions.ProgrammingError'>: (1064, "You have an error in your SQL syntax; check the manual  that corresponds to your MySQL server version for the right  syntax to use near 'RT @tweetmeme The Best BlackBerry Pearl  Cell Phone Covers http://bit.ly/9WtwUO''' at line 1")  [/usr/lib/python2.5/asyncore.py|read|68]  [/usr/lib/python2.5/asyncore.py|handle_read_event|390]  [/usr/lib/python2.5/asynchat.py|handle_read|137]  [/usr/lib/python2.5/site-packages/twitstream-0.1- py2.5.egg/twitstream/twitasync.py|found_terminator|55]  [twitter.py|callback|28] [build/bdist.linux- x86_64/egg/MySQLdb/cursors.py|execute|166] [build/bdist.linux- x86_64/egg/MySQLdb/connections.py|defaulterrorhandler|35]) 

Here is a link to the code that I am using http://pastebin.com/q5QSfYLa

#!/usr/bin/env python  try:         import json as simplejson except ImportError:         import simplejson  import twitstream import MySQLdb  USER = '' PASS = ''  USAGE = """%prog"""   conn = MySQLdb.connect(host = "",                        user = "",                        passwd = "",                        db = "")  # Define a function/callable to be called on every status: def callback(status):      twitdb = conn.cursor ()     twitdb.execute ("INSERT INTO tweets_unprocessed (text, created_at, twitter_id, user_id, user_screen_name, json) VALUES (%s,%s,%s,%s,%s,%s)",(status.get('text'), status.get('created_at'), status.get('id'), status.get('user', {}).get('id'), status.get('user', {}).get('screen_name'), status))     # print status      #print "%s:\t%s\n" % (status.get('user', {}).get('screen_name'), status.get('text'))  if __name__ == '__main__':     # Call a specific API method from the twitstream module:     # stream = twitstream.spritzer(USER, PASS, callback)      twitstream.parser.usage = USAGE     (options, args) = twitstream.parser.parse_args()      if len(args) < 1:         args = ['Blackberry']      stream = twitstream.track(USER, PASS, callback, args, options.debug, engine=options.engine)      # Loop forever on the streaming call:     stream.run() 

Answer 1

use json.dumps(json_value) to convert your json object(python object) in a json string that you can insert in a text field in mysql

http://docs.python.org/library/json.html

Answer 2

To expand on the other answers:

Basically you need make sure of two things:

1. That you have room for the full amount of data that you want to insert in the field that you are trying to place it. Different database field types can fit different amounts of data. See: MySQL String Datatypes. You probably want the "TEXT" or "BLOB" types.

2. That you are safely passing the data to database. Some ways of passing data can cause the database to "look" at the data and it will get confused if the data looks like SQL. It's also a security risk. See: SQL Injection

The solution for #1 is to check that the database is designed with correct field type.

The solution for #2 is use parameterized (bound) queries. For instance, instead of:

# Simple, but naive, method. # Notice that you are passing in 1 large argument to db.execute() db.execute("INSERT INTO json_col VALUES (" + json_value + ")") 

Better, use:

# Correct method. Uses parameter/bind variables. # Notice that you are passing in 2 arguments to db.execute() db.execute("INSERT INTO json_col VALUES %s", json_value) 

Hope this helps. If so, let me know. :-)

If you are still having a problem, then we will need to examine your syntax more closely.