In the beginning, there was the recordset, a central feature of classic ADO.
Like a Swiss army knife, it wasn’t the perfect tool for every job, but given the correct configuration, it could do whatever you needed it to do.
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And reading the Data Reader actually consumed the row. Has Rows, you need to cast it to the implementation class that supports it. The Data Set has a Tables collection of Data Table objects, and the Data Table has a Rows collection that can be indexed to get to a particular row by number. Count property that enables the developer to determine the number of rows in any of the tables in a Data Set.
Fortunately, version 1.1 implementations contain a . Note: There is no IData Reader2 interface that includes the . One thing missing in the classic ADO recordset was the ability to control exactly how an update would take place.
So Let’s start with post with a very often situation in our coding life.
Generally we used Data Set for having the collection of Data.
If you need read-only access to the data, something often done inside an ASP. Unless you are going to persist the data between postbacks, the data that you use to, say, populate a grid, will not be present when someone clicks on one of the rows of that grid. NET application model is that there will be a number of independent requests, and between requests, a client will not maintain a connection to the database. NET provides session state, a way of maintaining the appearance of a stateful application, but storing a client-specific Data Set in session state is not considered good form and may limit the scalability of your application.
When updates to the data are required, you can either directly execute UPDATE, INSERT or DELETE SQL statements, or you can call a stored procedure.
So while the recordset could do almost any task, most code did not use it correctly-in some cases using inappropriate default values, and in others explicitly setting parameters in ways that were not optimal for the application at hand. NET, then called ADO , I was a little concerned: Calling this new technology by the same name as what we now know as classic ADO would cause no end of confusion. They expected a 2.0 sort of upgrade to classic ADO. NET was a totally new set of components, and it was optimized for the Internet world. NET, you can use either a Data Reader or a Data Set. There are a number of data providers, such as Sql Client, included with ADO.
I was also troubled by the lack of scrollable cursors and a number of other features not supported in ADO. NET, and each has its own implementation of the Data Reader.
Unfortunately, there are a number of occasions when this is not possible. A common use of the Data Reader to read through a result set would look like the following: When you get the results into the Data Reader, it’s important to note that the “cursor” or logical pointer into the returned data is just before the first row. When working with recordsets, the logical pointer is initially placed at the first row of data.
To read records you must create a loop that contains a call to . I cannot tell you the number of times I forgot this when working with recordsets in classic ADO.
Whenever my application stopped when it should be reading data, I knew I had forgotten or misplaced the . A common complaint on the newsgroups related to classic ADO recordsets was the lack of a reliable row count.