How to implement SVN commit and rollback?

To implement SVN (Subversion) commit and rollback, you first need to understand the basic concepts. A commit in SVN is the action of sending changes to the repository, while a rollback is the process of undoing those changes.

Committing Changes:

Update Your Working Copy: Before committing, ensure your working copy is up-to-date with the repository by using the command svn update.
Review Changes: Use svn status to see the changes you've made.
Commit Changes: Use the svn commit command followed by a message describing your changes. For example:
```
svn commit -m "Added new feature X"
```

Rolling Back Changes:

Identify the Revision to Rollback To: Determine the revision number you want to revert to. You can view the revision history with svn log.
Use svn merge for Rollback: To rollback to a specific revision, you can use the svn merge command. For example, to rollback from the current revision to revision 100, you would use:
```
svn merge -r HEAD:100 .
```
This command merges changes from revision 100 up to the HEAD (the latest revision) in reverse, effectively undoing those changes.
Commit the Rollback: After merging, commit the changes with a descriptive message:
```
svn commit -m "Rolled back to revision 100"
```

Example Scenario:

Imagine you've made several commits to a project, but the latest commit (revision 105) introduced a critical bug. You want to rollback to revision 104.

Update your working copy:
```
svn update
```
Merge changes to rollback:
```
svn merge -r 105:104 .
```
Resolve any conflicts if they occur.

Commit the rollback:

svn commit -m "Rolled back to revision 104 due to critical bug"

For managing large-scale projects and ensuring robust version control, consider using cloud-based services like Tencent Cloud's Cloud Studio, which offers integrated development environments and version control systems to streamline your development workflow.