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

Posted on 2016-10-04
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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
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Question by:mickt
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3 Comments
 
LVL 9

Accepted Solution

by:
Brian Tao earned 500 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';

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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.
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LVL 110

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.
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Author Closing Comment

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