Updating dataset asp net
The purpose of command object is to retrieve suitable data needed for populating Data Set.
As we know SQL commands directly interacting with database tables, a similar command can be assigned to Command Object. In this example, we have created a Data Table named Employee Data and the values in this table would be the results of SQL query: "Select * from employee".
The following code shows a typical contains a client copy of the database data.
In this section, you will add a button that enables client data changes to be saved back to the database.
Using bind variables makes the statement reusable with different input values.
Using bind variables also improves query performance in the database, eliminates the need for special handling of literal quotation marks in the input, and protects against SQL injection attacks.
So far in this chapter, you have seen how to update a database and how to add transactions to ensure data integrity.
All of that is fine as far as it goes, but nothing you’ve done so far to update the database takes advantage of the Data Set object, which you will remember is the keystone of ADO. If you are using the Data Set object to retrieve data and pass it from tier to tier within your application, you would also like to manipulate that data within the dataset and push the changes back to the database.
If the statement does exist in memory, Oracle Database can reuse it and skip the task of parsing and optimizing the statement.There are three other properties including Update Command, Add Command and Delete Command.All these commands would make changes in the database.How these functions can be handled using Data Sets and Data Adapters?We have discussed that Data Sets can not directly interact with Database tables.