add FAQs about collation for JDBC connections (#20848) #20869
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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Aolin <[email protected]>
Co-authored-by: Aolin <[email protected]>
Co-authored-by: Aolin <[email protected]>
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Hello @ti-chi-bot, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
Summary of Changes
This pull request adds FAQs about collation for JDBC connections. It addresses how the collation used in JDBC connections changes after upgrading TiDB, especially concerning the connectionCollation and characterEncoding parameters in the JDBC URL. The changes include adding notes to the Java JDBC tutorial and adding a new section to the SQL FAQ and Upgrade FAQ, detailing how collation is handled in different TiDB versions and JDBC driver versions.
Highlights
- JDBC Connection Collation: Adds a section to the SQL FAQ explaining how collation is determined in JDBC connections when
connectionCollationis not explicitly configured, covering different scenarios based on JDBC driver versions and TiDB versions. - Upgrade Considerations: Adds a section to the Upgrade FAQ about potential collation changes after upgrading to TiDB v7.4 or later, and recommends configuring
connectionCollationin the JDBC URL to maintain the desired collation. - JDBC Tutorial Update: Updates the Java JDBC tutorial to include a note about the impact of TiDB v7.4 and later versions on JDBC connection collation, directing users to the SQL FAQ for more information.
Changelog
Click here to see the changelog
- develop/dev-guide-sample-application-java-jdbc.md
- Adds a note about collation changes in TiDB v7.4+ when
connectionCollationis not configured in the JDBC URL. - Provides a link to the SQL FAQ for more information on collation in JDBC connections.
- Adds a note about collation changes in TiDB v7.4+ when
- faq/sql-faq.md
- Adds a new section dedicated to FAQs about collation in JDBC connections.
- Explains how the collation is determined when
connectionCollationis not configured, considering different JDBC driver versions and TiDB versions. - Provides guidance on handling collation changes after upgrading TiDB.
- Explains the differences between
utf8mb4_binandutf8mb4_0900_ai_cicollations with examples.
- faq/upgrade-faq.md
- Adds a new FAQ addressing collation changes in JDBC connections after upgrading TiDB.
- Recommends configuring
connectionCollation=utf8mb4_binin the JDBC URL to maintain theutf8mb4_bincollation after upgrading. - Links to the SQL FAQ for more detailed information.
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Code Review
The pull request adds FAQs about collation for JDBC connections. The changes include updates to a Java JDBC tutorial and additions to SQL and upgrade FAQs. Overall, the changes seem well-structured and informative. However, some minor improvements can be made to enhance clarity and consistency.
Summary of Findings
- Inconsistent use of terminology: The phrase 'characterEncoding is either not configured or set to
UTF-8' is repeated multiple times. Consider rephrasing for brevity and consistency. [^1] - Markdown style: There are missing blank lines before and after headings and lists in
faq/sql-faq.md. [^2] - Clarity and simplicity: In
faq/sql-faq.md, the explanation of collation differences could be simplified for better understanding. [^3]
Merge Readiness
The pull request is almost ready for merging. Addressing the minor issues related to terminology consistency and markdown style would improve the overall quality of the documentation. I am unable to approve this pull request, and recommend that others review and approve this code before merging.
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/approve |
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: qiancai The full list of commands accepted by this bot can be found here. The pull request process is described here
Needs approval from an approver in each of these files:
Approvers can indicate their approval by writing |
This is an automated cherry-pick of #20848
First-time contributors' checklist
What is changed, added or deleted? (Required)
Which TiDB version(s) do your changes apply to? (Required)
Tips for choosing the affected version(s):
By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.
For details, see tips for choosing the affected versions (in Chinese).
What is the related PR or file link(s)?
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