?
Solved

How can I iterate through mysql tables to alter character set?

Posted on 2016-10-04
3
Medium Priority
?
110 Views
Last Modified: 2016-10-12
I tried the following.


from alembic import op

    # Convert character set to utf8
    for table in op.execute("SHOW TABLES"):
        print tables
        op.execute("alter table " + table + " convert to character set utf8 collate utf8_general_ci")

throws the following error:
TypeError: 'NoneType' object is not iterable

I also tried

    tables = op.execute("SHOW TABLES")
    for table in tables():
        print tables
        op.execute("alter table " + table + " convert to character set utf8 collate utf8_general_ci")

throws the following error:
TypeError: 'NoneType' object is not callable
0
Comment
Question by:mickt
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 9

Accepted Solution

by:
Brian Tao earned 2000 total points
ID: 41828093
I don't think MySQL supports such query structure.  You have to first use a query against the table names to generate those ALTER statements, and then run those statements.
This will generate the required ALTER statements ("convert to" is not needed):
SELECT CONCAT('ALTER TABLE _your_database_name_.', table_name, ' CHARACTER SET utf8 COLLATE utf8_general_ci;') stmt FROM information_schema.TABLES WHERE table_schema='_your_database_name_' AND table_type='BASE TABLE';

Open in new window

and then run those statements (Don't forget to replace _your_database_name_ with your actual database name).

You can use PHP to write the whole thing, or just use your favorite MySQL tools to generate and run those statements.
0
 
LVL 111

Expert Comment

by:Ray Paseur
ID: 41828145
This does not look like a PHP script, since the variable names do not start with dollar signs.  Suggest you request attention and ask a moderator to put this into the correct zones for the languages you're using.
0
 

Author Closing Comment

by:mickt
ID: 41839657
Thanks.  It's useful and I'll use it elsewhere.
0

Featured Post

Percona Live Europe 2017 | Sep 25 - 27, 2017

The Percona Live Open Source Database Conference Europe 2017 is the premier event for the diverse and active European open source database community, as well as businesses that develop and use open source database software.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This post contains step-by-step instructions for setting up alerting in Percona Monitoring and Management (PMM) using Grafana.
This post looks at MongoDB and MySQL, and covers high-level MongoDB strengths, weaknesses, features, and uses from the perspective of an SQL user.
Learn the basics of lists in Python. Lists, as their name suggests, are a means for ordering and storing values. : Lists are declared using brackets; for example: t = [1, 2, 3]: Lists may contain a mix of data types; for example: t = ['string', 1, T…
In this video, Percona Solution Engineer Dimitri Vanoverbeke discusses why you want to use at least three nodes in a database cluster. To discuss how Percona Consulting can help with your design and architecture needs for your database and infras…
Suggested Courses

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question