Add C# / .NET example #21206
Add C# / .NET example #21206
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Summary of Changes
Hello @dveeden, 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!
This pull request expands the TiDB documentation by adding a new guide and code example for connecting to TiDB using C# and the .NET framework. The primary objective is to provide clear instructions and a practical sample for developers looking to integrate C# applications with TiDB, highlighting its compatibility with the MySQL protocol.
Highlights
- New C#/.NET Example: This pull request introduces a comprehensive new documentation page (
develop/dev-guide-sample-application-cs.md) that provides a step-by-step guide for connecting C# applications to TiDB. It covers project setup, dependency management using NuGet (MySql.Data), and includes a functional C# code sample. - Documentation Integration: The newly added C# example is integrated into the existing documentation structure by updating the Table of Contents files (
TOC-tidb-cloud.mdandTOC.md). This ensures the new content is discoverable and accessible to users browsing the documentation. - MySQL Compatibility Demonstration: The C# example explicitly leverages TiDB's MySQL compatibility by using the standard
MySql.Dataconnector for .NET, demonstrating how existing MySQL client libraries can be used to interact with TiDB.
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Code Review
This pull request adds a C# example for connecting to TiDB. The documentation is well-structured and provides a good starting point for .NET developers. The review includes suggestions to enhance code robustness and adhere more closely to the style guide. The changes to TOC files are correct.
The review comments reference the following aspects of the style guide:
- General Writing Principles:
- Use of second person ("you") (Style Guide ref: lines 22-22).
- Correct grammar, spelling, and punctuation (Style Guide ref: lines 20-20, 55-57).
- Structure and Format:
- Sentence case for headings (Style Guide ref: lines 32-32).
| MySqlConnection conn = new MySqlConnection(connStr); | ||
| try | ||
| { | ||
| Console.WriteLine("Connecting to TiDB...\n"); | ||
| conn.Open(); | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| Console.WriteLine(ex.ToString()); | ||
| } | ||
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| Console.WriteLine("Connected to: " + conn.ServerVersion); | ||
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| MySqlCommand cmd = new MySqlCommand("SELECT TIDB_VERSION()", conn); | ||
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| MySqlDataReader rdr = cmd.ExecuteReader(); | ||
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| rdr.Read(); | ||
| Console.WriteLine("\nVersion details:\n" + rdr[0]); | ||
| rdr.Close(); | ||
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| conn.Close(); | ||
| Console.WriteLine("Done."); | ||
| } |
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The current C# code for connecting and querying can be made more robust and idiomatic:
- Error Handling: If
conn.Open()fails, the subsequent lines attempting to useconn(e.g.,conn.ServerVersion,cmd.ExecuteReader()) will throw further exceptions. The logic dependent on a successful connection should be within thetryblock or protected by a check. - Resource Management:
MySqlConnection,MySqlCommand, andMySqlDataReaderareIDisposable. Usingusingstatements ensures they are correctly disposed of, even if errors occur. This also handles closing the connection and reader automatically. - DataReader Check: It's good practice to check the return value of
rdr.Read()before trying to access data.
Here's a revised version of the Main method body (excluding connStr initialization for brevity in this comment, but included in the suggestion) that incorporates these improvements:
// Using 'using' for MySqlConnection ensures it's disposed correctly.
using (MySqlConnection conn = new MySqlConnection(connStr))
{
try
{
Console.WriteLine("Connecting to TiDB...\n");
conn.Open();
Console.WriteLine("Successfully connected!"); // Added for clarity
Console.WriteLine("Connected to TiDB version: " + conn.ServerVersion);
// 'using' for MySqlCommand and MySqlDataReader ensures they are disposed.
using (MySqlCommand cmd = new MySqlCommand("SELECT TIDB_VERSION()", conn))
using (MySqlDataReader rdr = cmd.ExecuteReader())
{
if (rdr.Read()) // Check if there is data to read
{
Console.WriteLine("\nTiDB specific version details:\n" + rdr[0]);
}
else
{
Console.WriteLine("\nCould not retrieve TiDB specific version details.");
}
// rdr.Close() is handled by the 'using' statement's Dispose()
}
}
catch (Exception ex)
{
Console.WriteLine("An error occurred:");
Console.WriteLine(ex.ToString());
}
// conn.Close() is handled by the 'using' statement's Dispose()
}
Console.WriteLine("Done.");
}| { | ||
| public static void Main() | ||
| { | ||
| string connStr = "server=127.0.0.1;user=root;database=test;port=4000"; |
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The example connection string is good for a local tiup playground setup. It might be helpful to briefly remind users about password security for production or self-hosted environments beyond tiup playground. Also, for general MySQL compatibility, especially if user-defined variables might be used in other queries, AllowUserVariables=true can be useful, though not strictly required for this specific example.
| string connStr = "server=127.0.0.1;user=root;database=test;port=4000"; | |
| string connStr = "server=127.0.0.1;user=root;database=test;port=4000;AllowUserVariables=true"; // For production, always use strong, unique passwords. |
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This makes the line too long. Maybe the comment should be on the line above?
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You are absolutely right, dveeden! My apologies for the oversight regarding line length. Placing the comment on the same line as the connection string can indeed make it exceed readability limits, especially in documentation where code examples should be clean and easy to follow.
Moving the comment to a separate line above the connStr declaration is a much better approach for readability and adherence to common style guides. This keeps the line length manageable while still providing the important context about password security and the AllowUserVariables=true option for broader MySQL compatibility.
Thank you for pointing this out!
| string connStr = "server=127.0.0.1;user=root;database=test;port=4000"; | |
| // For production, always use strong, unique passwords. | |
| string connStr = "server=127.0.0.1;user=root;database=test;port=4000;AllowUserVariables=true"; |
hfxsd
added
translation/doing
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[APPROVALNOTIFIER] This PR is NOT APPROVED This pull-request has been approved by: The full list of commands accepted by this bot can be found here.
Needs approval from an approver in each of these files:
Approvers can indicate their approval by writing |
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
| --- | ||
| title: Connect to TiDB with C# | ||
| summary: Learn how to connect to TiDB using C#. This tutorial gives C# sample code snippets that work with TiDB. | ||
| aliases: ['/tidb/dev/sample-application-cs','/tidb/dev/dev-guide-sample-application-cs'] |
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| aliases: ['/tidb/dev/sample-application-cs','/tidb/dev/dev-guide-sample-application-cs'] |
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@hfxsd this doesn't make any actual changes?
Co-authored-by: xixirangrang <[email protected]>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
What is changed, added or deleted? (Required)
Add example with C#
Which TiDB version(s) do your changes apply to? (Required)
Tips for choosing the affected version(s):
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For details, see tips for choosing the affected versions.
What is the related PR or file link(s)?
Do your changes match any of the following descriptions?