How to undo changes
dbForge Studio for MySQL allows you to revert database changes made to the object and static data in a database linked to a remote repository, provided these changes have not yet been committed.
Note
The Undo operation leads to permanent changes in the database linked to a version control repository. These changes can be restored only from a database backup that was created before you executed the Undo operation.
To start using the Source Control tool, you must link a database to the version control repository by following the steps outlined in the relevant how-to topic:
- Link a database to Git
- Link a database to a Git repository in GitHub
- Link a database to TFVC
- Link a database to SVN
- Link a database to Mercurial
- Link a database to Perforce
- Link a database to Plastic SCM and other systems
- Link a database to SourceGear Vault
The linked database gets the following icon in Database Explorer:
Note
It is important to link static data to source control to prevent any data loss when updating your local database with the latest changes from the remote repository or reverting database changes made to the object and static data in a database.
The Source Control tool checks if any changes have been made to the database, either locally or remotely, and verifies if they have been committed to the repository. In the same way, the tool checks if any changes have been committed to the version control and if they have been deployed to the linked database.
In addition, the Source Control identifies conflicts that may occur if multiple developers were making changes to the same file in the repository and the local database.
The Refresh progress window opens automatically showing the stages of the refresh operation.
After the refresh operation is complete, the Source Control Manager opens displaying all the changes in the following sections:
It should be noted that the Source Control Manager can display all three sections, or two of them, or just one section.
Note
Local changes section
- The Add change type indicates that the object was created locally in the database that is being version-controlled using Source Control and has not been committed to the remote repository yet. Selecting the object and clicking Undo will remove it from the local database.
- The Remove change type means that the object was deleted from the local database that is being version-controlled using Source Control but is still present in the remote repository. Selecting the object and clicking Undo will restore it in the local database.
- The Modify change type indicates that changes were made to the object in the local database that is being version-controlled using Source Control. As a result, the object’s DDL in the local database differs from the version stored in the remote repository. Selecting the object and clicking Undo will discard the changes made to the object in the local database, reverting it to the version from the repository.
Remote changes section
- The Add change type indicates that the object has been added to the remote repository since the last synchronization and is not present in the local database that is linked to this repository via Source Control. Clicking Get Latest will add the object to the local database.
- The Remove change type means that the object has been removed from the remote repository since the last synchronization but is present in the local database that is linked to this repository via Source Control. Clicking Get Latest will remove the object from the local database.
- The Modify change type indicates that the object has been modified in the remote repository since the last synchronization. As a result, the object’s DDL in the repository differs from the version stored in the local database that is linked to this repository via Source Control. Clicking Get Latest will update the object in the local database to match the version from the repository.
If the database and version control repository are identical and no changes are found, the following window is displayed:
To roll back the changes made to the database since the latest commit
In the Local changes section, select the checkboxes next to the objects and/or static data you want to undo and then click Undo.
Note
If you select the checkbox next to Local changes, all changes will be selected.
As you can see in the screenshot above, the Source Control grid contains the following columns:
| Column | Description |
|---|---|
| Change Type | For Undo: Actions to be applied to the object (but not to static data) in the linked database. These include the following actions for database objects: Add (the object will be dropped), Modify (the object will be altered), and Remove (the object will be created). For Commit: Actions to be applied to the object or static data in the source control repository. These include Add (the object or data will be added), Modify (the object or data will be modified), and Remove (the object or data will be removed). For more information about how to commit changes, see Committing changes |
| Type | The type of the object. Static Data is a table’s data type |
| Name | The name of the object that will undergo changes. A <name> (Data) construction refers to static data |
| Owner | The schema or database in which the object was created |
If you select an object that depends on other objects or changes in the Local Changes section, clicking Undo will display a window with a suggestion to include all related objects:
This case may occur when you add, for example, two new database objects such as a table and a view, which selects data from this new table. So, when you choose to deploy remote changes made only to the new view, you will be suggested to deploy the table associated with this view. In addition, you can exclude any related object from the deployment.
After clicking Undo, the tool asks whether you want to proceed:
After confirming the Undo operation, the Undo progress window opens showing the stages of the undo operation. When all the stages are complete, click OK to close the progress window.
Once done, the Refresh progress window opens automatically showing the stages of the refresh operation.
The Undo operation runs the deployment script generated by the Source Control against the linked database to update it with the latest version of the database stored in the remote repository. The script contains CREATE, ALTER, and/or DROP statements for the database objects selected in the Source Control Manager, as well as INSERT, UPDATE, and/or DELETE statements for the changes to static data and the statuses (Remove, Modify, Add) of the objects.
So, local changes made in a database and have not been committed yet to a version control repository have successfully been undone to the database with the help of dbForge Source Control.
Note
You cannot undo the following database changes:
- Committed changes
- Static data changes (a data link or a data edit cannot undergo an Undo operation. To unlink a specific table, refer to Link static data)
- Dropped data (dropped columns and tables cannot be restored with the Undo operation)
- NOT NULL columns (dropped NOT NULL columns with data cannot be restored with the Undo operation unless the columns have default values)
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