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28 lines
932 B
Markdown
28 lines
932 B
Markdown
# Run Statements In A Transaction
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I'm connecting to a production MySQL database to make some changes to a
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specific user account. That means I am going to run an `update` statement and I
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expect that statement to affect exactly *one* row in the `users` table.
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If I run the `update` statement in a transaction, then I can verify all looks
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good before committing those changes. And importantly, I can rollback the
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changes if anything looks off.
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```sql
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> start transaction;
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> update users set roles = 'admin' where id = '1234';
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Query ok, 1 row affected
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> select * from users where id = '1234';
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-- check that all looks good
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> commit;
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```
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In the above case, all looked good, so I ran `commit`. If more rows than I
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expected were affected or the changed record didn't look right, I could instead
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`rollback`. None of those changes would make it into live production data.
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[source](https://dev.mysql.com/doc/refman/8.0/en/commit.html)
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