Mysql adaptation

[NieRonghua]

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Summary

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

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[longbingljw]

Hello,thanks for your concern.I am sorry to be late.Now langgenius/dify has already supported mysql and oceanbase in their latest version 10.0.1.oceanbase:mainwill be synced with upstream for further work. @NieRonghua