When you need to change the data or structure of a database, you can use SQL Modification.
- On the top menu bar, choose Data Schemes > SQL Modification.Figure 1 SQL Modification
- In the Basic Information area, select the target database. You can select multiple databases.Figure 2 Add Database
- Enter the SQL statements or upload a SQL file.
- Enter the estimated number of rows that may be affected in this modification.Figure 3 Adding attachment
- In the Task Control Items area, select an execution mode. Set Execute Transaction, Skip Error, and Back Up Data.Figure 4 Task Control Items
- Execution Mode: Select an execution mode as required.
- Execute Transaction: This function is disabled by default. When it is disabled, SQL statements are executed one by one. If a SQL statement fails to be executed, the task will stop but will not roll back. When this function is enabled, all the executed SQL statements will be rolled back (DML only, DDL not included) if one statement fails to be executed.
- Skip Error: It is recommended that you enable this function. If an error occurs during execution, the system skips the SQL statement that fails to execute and continue to execute the next statement.
- Back Up Data:
- This function is disabled by default. To ensure your data security, it is recommended that you enable this function before making SQL modifications. The number of rows to be backed up cannot exceed 100,000.
- If this function is enabled, the SQL statement set or imported SQL file used during modification will be automatically backed up in case that you want to roll back the modification.
- Click Submit to go to the Perform Prechecks page.Figure 5 Perform Prechecks
- Check whether the precheck is passed.Figure 6 Check ItemFigure 7 Precheck failures
If the precheck fails, view the failure cause. If you need to update the uploaded file, click Modify Ticket to return to the previous page. Alternatively, click Modify SQL Statements.
After the modification is complete, click OK. The system automatically performs the precheck again.
- After the precheck is passed, click Submit for Approval.Figure 8 Passed prechecks
- The system performs the approval according to the approval process set for the database. After the approval is complete, click View Task Execution Info to view the approval progress.Figure 9 View Task Execution Info
- If you select Manually execute after approval for Execution Mode, click Execute Modification.Figure 10 Back up before execution
SQL statements that can be backed up include delete, update, insert_select, and replace_select.
- The SQL modification is complete after the backup.