Ssis updating database
Information about the changes in a dataset is maintained in two ways: by flagging rows that indicate that they have changed (Row State), and by keeping multiple copies of a record (Data Row Version).By using this information, processes can determine what has changed in the dataset and can send appropriate updates to the data source.This means that if you try to update the original data source with the target dataset, it might not be able to find the original row to update.You can prevent a concurrency violation by filling another dataset with the updated records from the data source and then performing a merge to prevent a concurrency violation.Or you might have application-specific validation checks that can raise custom errors during any stage of an update event.For more information, see Validate data in datasets.(A concurrency violation occurs when another user modifies a record in the data source after the dataset has been filled.)To make changes to an existing data row, add or update data in the individual columns.
For example, you might inadvertently write data of the wrong type to a column, or data that's too long, or data that has some other integrity problem.If you aren't using data-bound controls, then you have to manually call the Update method of the same Table Adapter (or data adapter) that you used to populate the dataset.However, you can also use different adapters, for example, to move data from one data source to another or to update multiple data sources.This serves two purposes: In Windows Forms, the data binding architecture that's built into the datagrid suspends constraint checking until focus moves out of a row, and you do not have to explicitly call the Begin Edit, End Edit, or Cancel Edit methods.Constraints are automatically disabled when the Merge method is invoked on a dataset.When the merge is complete, if there are any constraints on the dataset that cannot be enabled, a Constraint Exception is thrown.In this situation, the Enforce Constraints property is set to .Those methods perform the change tracking that's needed for updating the data source.If you call the Remove At collection on the Rows property, the deletion won't be communicated back to the database. When you merge datasets, new records in the source dataset are added to the target dataset.That is, it can be in an error state after you finish updating one column but before you get to the next one.To prevent premature constraint violations you can temporarily suspend update constraints.